mirror of
https://github.com/ZDoom/gzdoom-gles.git
synced 2024-11-11 15:22:15 +00:00
Merge remote-tracking branch 'origin/triangledrawer' into qzdoom
This commit is contained in:
Magnus Norddahl
commit
4e717cd9ee
4 changed files with 1137 additions and 1 deletions
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@ -1063,6 +1063,7 @@ set( FASTMATH_PCH_SOURCES
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r_segs.cpp
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r_sky.cpp
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r_things.cpp
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r_triangle.cpp
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s_advsound.cpp
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s_environment.cpp
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s_playlist.cpp
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256
src/r_plane.cpp
256
src/r_plane.cpp
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@ -59,7 +59,7 @@
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#include "v_palette.h"
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#include "r_data/colormaps.h"
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#include "r_draw_rgba.h"
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#include "gl/data/gl_matrix.h"
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#include "r_triangle.h"
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#ifdef _MSC_VER
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#pragma warning(disable:4244)
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@ -1015,6 +1015,250 @@ static const BYTE *R_GetTwoSkyColumns (FTexture *fronttex, int x)
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}
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}
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static void R_DrawCubeSky(visplane_t *pl)
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{
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int x1 = pl->left;
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int x2 = pl->right;
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short *uwal = (short *)pl->top;
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short *dwal = (short *)pl->bottom;
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static TriVertex cube[6 * 6] =
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{
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// Top
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{ -1.0f, 1.0f, 0.6f, 1.0f, 1.0f, 0.0f, 1.0f },
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{ 1.0f, 1.0f, 0.6f, 1.0f, 0.0f, 0.0f, 1.0f },
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{ 1.0f, -1.0f, 0.6f, 1.0f, 0.0f, 0.1f, 1.0f },
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{ 1.0f, -1.0f, 0.6f, 1.0f, 0.0f, 0.1f, 1.0f },
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{ -1.0f, -1.0f, 0.6f, 1.0f, 1.0f, 0.1f, 1.0f },
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{ -1.0f, 1.0f, 0.6f, 1.0f, 1.0f, 0.0f, 1.0f },
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// Bottom
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{ 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 0.9f, 1.0f },
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{ 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 1.0f, 1.0f },
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{ -1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 1.0f, 1.0f },
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{ -1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 1.0f, 1.0f },
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{ -1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.9f, 1.0f },
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{ 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 0.9f, 1.0f },
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// Front
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{ 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 2.0f, 1.0f },
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{ 1.0f, 1.0f, 0.6f, 1.0f, 1.0f, 0.0f, 1.0f },
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{ -1.0f, 1.0f, 0.6f, 1.0f, 0.0f, 0.0f, 1.0f },
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{ -1.0f, 1.0f, 0.6f, 1.0f, 0.0f, 0.0f, 1.0f },
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{ -1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 2.0f, 1.0f },
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{ 1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 2.0f, 1.0f },
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// Back
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{ -1.0f, -1.0f, 0.6f, 1.0f, 1.0f, 0.0f, 1.0f },
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{ 1.0f, -1.0f, 0.6f, 1.0f, 0.0f, 0.0f, 1.0f },
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{ 1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 2.0f, 1.0f },
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{ 1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 2.0f, 1.0f },
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{ -1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 2.0f, 1.0f },
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{ -1.0f, -1.0f, 0.6f, 1.0f, 1.0f, 0.0f, 1.0f },
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// Right
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{ 1.0f, -1.0f, 0.6f, 1.0f, 1.0f, 0.0f, 1.0f },
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{ 1.0f, 1.0f, 0.6f, 1.0f, 0.0f, 0.0f, 1.0f },
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{ 1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 2.0f, 1.0f },
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{ 1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 2.0f, 1.0f },
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{ 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 2.0f, 1.0f },
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{ 1.0f, -1.0f, 0.6f, 1.0f, 1.0f, 0.0f, 1.0f },
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// Left
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{ -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 2.0f, 1.0f },
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{ -1.0f, 1.0f, 0.6f, 1.0f, 1.0f, 0.0f, 1.0f },
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{ -1.0f, -1.0f, 0.6f, 1.0f, 0.0f, 0.0f, 1.0f },
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{ -1.0f, -1.0f, 0.6f, 1.0f, 0.0f, 0.0f, 1.0f },
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{ -1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 2.0f, 1.0f },
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{ -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, 2.0f, 1.0f }
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};
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TriMatrix objectToWorld = TriMatrix::translate((float)ViewPos.X, (float)ViewPos.Y, (float)ViewPos.Z) * TriMatrix::scale(1000.0f, 1000.0f, 1000.0f);
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TriMatrix objectToClip = TriMatrix::viewToClip() * TriMatrix::worldToView() * objectToWorld;
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//TriMatrix objectToWorld = TriMatrix::scale(1000.0f, 1000.0f, 1000.0f);
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//TriMatrix objectToClip = TriMatrix::viewToClip() * objectToWorld;
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uint32_t solid_top = frontskytex->GetSkyCapColor(false);
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uint32_t solid_bottom = frontskytex->GetSkyCapColor(true);
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solid_top = RGB32k.RGB[(RPART(solid_top) >> 3)][(GPART(solid_top) >> 3)][(BPART(solid_top) >> 3)];
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solid_bottom = RGB32k.RGB[(RPART(solid_bottom) >> 3)][(GPART(solid_bottom) >> 3)][(BPART(solid_bottom) >> 3)];
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TriangleDrawer::fill(objectToClip, cube, 6, TriangleDrawMode::Normal, false, x1, x2 - 1, uwal, dwal, solid_top);
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TriangleDrawer::fill(objectToClip, cube + 6, 6, TriangleDrawMode::Normal, false, x1, x2 - 1, uwal, dwal, solid_bottom);
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TriangleDrawer::draw(objectToClip, cube + 2 * 6, 4 * 6, TriangleDrawMode::Normal, false, x1, x2 - 1, uwal, dwal, frontskytex);
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}
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namespace
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{
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class SkyDome
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{
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public:
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SkyDome() { CreateDome(); }
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void Render(visplane_t *pl);
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private:
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TArray<TriVertex> mVertices;
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TArray<unsigned int> mPrimStart;
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int mRows, mColumns;
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void SkyVertex(int r, int c, bool yflip);
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void CreateSkyHemisphere(bool zflip);
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void CreateDome();
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void RenderRow(int row, visplane_t *pl);
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void RenderCapColorRow(int row, bool bottomCap, visplane_t *pl);
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TriVertex SetVertex(float xx, float yy, float zz, float uu = 0, float vv = 0);
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TriVertex SetVertexXYZ(float xx, float yy, float zz, float uu = 0, float vv = 0);
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};
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TriVertex SkyDome::SetVertex(float xx, float yy, float zz, float uu, float vv)
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{
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TriVertex v;
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v.x = xx;
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v.y = yy;
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v.z = zz;
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v.w = 1.0f;
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v.varying[0] = uu;
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v.varying[1] = vv;
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v.varying[2] = 1.0f;
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return v;
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}
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TriVertex SkyDome::SetVertexXYZ(float xx, float yy, float zz, float uu, float vv)
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{
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TriVertex v;
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v.x = xx;
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v.y = zz;
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v.z = yy;
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v.w = 1.0f;
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v.varying[0] = uu;
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v.varying[1] = vv;
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v.varying[2] = 1.0f;
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return v;
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}
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void SkyDome::SkyVertex(int r, int c, bool zflip)
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{
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static const FAngle maxSideAngle = 60.f;
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static const float scale = 10000.;
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FAngle topAngle = (c / (float)mColumns * 360.f);
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FAngle sideAngle = maxSideAngle * (mRows - r) / mRows;
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float height = sideAngle.Sin();
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float realRadius = scale * sideAngle.Cos();
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FVector2 pos = topAngle.ToVector(realRadius);
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float z = (!zflip) ? scale * height : -scale * height;
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float u, v;
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//uint32_t color = r == 0 ? 0xffffff : 0xffffffff;
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// And the texture coordinates.
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if (!zflip) // Flipped Y is for the lower hemisphere.
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{
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u = (-c / (float)mColumns);
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v = (r / (float)mRows);
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}
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else
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{
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u = (-c / (float)mColumns);
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v = 1.0f + ((mRows - r) / (float)mRows);
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}
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if (r != 4) z += 300;
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// And finally the vertex.
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TriVertex vert;
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vert = SetVertexXYZ(-pos.X, z - 1.f, pos.Y, u * 4.0f, v + 0.5f/*, color*/);
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mVertices.Push(vert);
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}
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void SkyDome::CreateSkyHemisphere(bool zflip)
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{
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int r, c;
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mPrimStart.Push(mVertices.Size());
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for (c = 0; c < mColumns; c++)
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{
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SkyVertex(1, c, zflip);
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}
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// The total number of triangles per hemisphere can be calculated
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// as follows: rows * columns * 2 + 2 (for the top cap).
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for (r = 0; r < mRows; r++)
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{
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mPrimStart.Push(mVertices.Size());
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for (c = 0; c <= mColumns; c++)
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{
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SkyVertex(r + zflip, c, zflip);
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SkyVertex(r + 1 - zflip, c, zflip);
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}
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}
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}
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void SkyDome::CreateDome()
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{
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mColumns = 128;
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mRows = 4;
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CreateSkyHemisphere(false);
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CreateSkyHemisphere(true);
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mPrimStart.Push(mVertices.Size());
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}
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void SkyDome::RenderRow(int row, visplane_t *pl)
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{
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int x1 = pl->left;
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int x2 = pl->right;
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short *uwal = (short *)pl->top;
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short *dwal = (short *)pl->bottom;
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TriMatrix objectToWorld = TriMatrix::translate((float)ViewPos.X, (float)ViewPos.Y, (float)ViewPos.Z);
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TriMatrix objectToClip = TriMatrix::viewToClip() * TriMatrix::worldToView() * objectToWorld;
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TriangleDrawer::draw(objectToClip, &mVertices[mPrimStart[row]], mPrimStart[row + 1] - mPrimStart[row], TriangleDrawMode::Strip, false, x1, x2 - 1, uwal, dwal, frontskytex);
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}
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void SkyDome::RenderCapColorRow(int row, bool bottomCap, visplane_t *pl)
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{
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uint32_t solid = frontskytex->GetSkyCapColor(bottomCap);
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solid = RGB32k.RGB[(RPART(solid) >> 3)][(GPART(solid) >> 3)][(BPART(solid) >> 3)];
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int x1 = pl->left;
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int x2 = pl->right;
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short *uwal = (short *)pl->top;
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short *dwal = (short *)pl->bottom;
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TriMatrix objectToWorld = TriMatrix::translate((float)ViewPos.X, (float)ViewPos.Y, (float)ViewPos.Z);
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TriMatrix objectToClip = TriMatrix::viewToClip() * TriMatrix::worldToView() * objectToWorld;
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TriangleDrawer::fill(objectToClip, &mVertices[mPrimStart[row]], mPrimStart[row + 1] - mPrimStart[row], TriangleDrawMode::Fan, bottomCap, x1, x2 - 1, uwal, dwal, solid);
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}
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void SkyDome::Render(visplane_t *pl)
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{
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int rc = mRows + 1;
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// No need to draw this as the software renderer can't look that high anyway
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//RenderCapColorRow(0, false, pl);
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//RenderCapColorRow(rc, true, pl);
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for (int i = 1; i <= mRows; i++)
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{
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RenderRow(i, pl);
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RenderRow(rc + i, pl);
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}
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}
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}
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static void R_DrawDomeSky(visplane_t *pl)
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{
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static SkyDome skydome;
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skydome.Render(pl);
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}
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static void R_DrawSkyColumnStripe(int start_x, int y1, int y2, int columns, double scale, double texturemid, double yrepeat)
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{
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uint32_t height = frontskytex->GetHeight();
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@ -1212,6 +1456,16 @@ static void R_DrawSky (visplane_t *pl)
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R_DrawCapSky(pl);
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return;
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}
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else if (r_skymode == 3)
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{
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R_DrawCubeSky(pl);
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return;
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}
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else if (r_skymode == 4)
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{
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R_DrawDomeSky(pl);
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return;
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}
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int x;
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float swal;
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772
src/r_triangle.cpp
Normal file
772
src/r_triangle.cpp
Normal file
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@ -0,0 +1,772 @@
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/*
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** Triangle drawers
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** Copyright (c) 2016 Magnus Norddahl
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**
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** This software is provided 'as-is', without any express or implied
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** warranty. In no event will the authors be held liable for any damages
|
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** arising from the use of this software.
|
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**
|
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** Permission is granted to anyone to use this software for any purpose,
|
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** including commercial applications, and to alter it and redistribute it
|
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** freely, subject to the following restrictions:
|
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**
|
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** 1. The origin of this software must not be misrepresented; you must not
|
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** claim that you wrote the original software. If you use this software
|
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** in a product, an acknowledgment in the product documentation would be
|
||||
** appreciated but is not required.
|
||||
** 2. Altered source versions must be plainly marked as such, and must not be
|
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** misrepresented as being the original software.
|
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** 3. This notice may not be removed or altered from any source distribution.
|
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**
|
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*/
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#include <stddef.h>
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#include "templates.h"
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#include "doomdef.h"
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#include "i_system.h"
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#include "w_wad.h"
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#include "r_local.h"
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#include "v_video.h"
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#include "doomstat.h"
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#include "st_stuff.h"
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#include "g_game.h"
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#include "g_level.h"
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#include "r_data/r_translate.h"
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#include "v_palette.h"
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#include "r_data/colormaps.h"
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#include "r_triangle.h"
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void TriangleDrawer::draw(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture)
|
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{
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draw_arrays(objectToClip, vinput, vcount, mode, ccw, clipleft, clipright, cliptop, clipbottom, texture, 0, &ScreenTriangleDrawer::draw);
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}
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void TriangleDrawer::fill(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, int solidcolor)
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{
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draw_arrays(objectToClip, vinput, vcount, mode, ccw, clipleft, clipright, cliptop, clipbottom, nullptr, solidcolor, &ScreenTriangleDrawer::fill);
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}
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void TriangleDrawer::draw_arrays(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture, int solidcolor, void(*drawfunc)(const ScreenTriangleDrawerArgs *))
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{
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if (vcount < 3)
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return;
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ScreenTriangleDrawerArgs args;
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args.dest = dc_destorg;
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args.pitch = dc_pitch;
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args.clipleft = clipleft;
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args.clipright = clipright;
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args.cliptop = cliptop;
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args.clipbottom = clipbottom;
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if (texture)
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{
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args.textureWidth = texture->GetWidth();
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args.textureHeight = texture->GetHeight();
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args.texturePixels = texture->GetPixels();
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}
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else
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{
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args.textureWidth = 0;
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args.textureHeight = 0;
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args.texturePixels = nullptr;
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}
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args.solidcolor = solidcolor;
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TriVertex vert[3];
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if (mode == TriangleDrawMode::Normal)
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{
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for (int i = 0; i < vcount / 3; i++)
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{
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for (int j = 0; j < 3; j++)
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vert[j] = shade_vertex(objectToClip, *(vinput++));
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draw_shaded_triangle(vert, ccw, &args, drawfunc);
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}
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}
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else if (mode == TriangleDrawMode::Fan)
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{
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vert[0] = shade_vertex(objectToClip, *(vinput++));
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vert[1] = shade_vertex(objectToClip, *(vinput++));
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for (int i = 2; i < vcount; i++)
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{
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vert[2] = shade_vertex(objectToClip, *(vinput++));
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draw_shaded_triangle(vert, ccw, &args, drawfunc);
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vert[1] = vert[2];
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}
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}
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else // TriangleDrawMode::Strip
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||||
{
|
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vert[0] = shade_vertex(objectToClip, *(vinput++));
|
||||
vert[1] = shade_vertex(objectToClip, *(vinput++));
|
||||
for (int i = 2; i < vcount; i++)
|
||||
{
|
||||
vert[2] = shade_vertex(objectToClip, *(vinput++));
|
||||
draw_shaded_triangle(vert, ccw, &args, drawfunc);
|
||||
vert[0] = vert[1];
|
||||
vert[1] = vert[2];
|
||||
ccw = !ccw;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
TriVertex TriangleDrawer::shade_vertex(const TriMatrix &objectToClip, TriVertex v)
|
||||
{
|
||||
// Apply transform to get clip coordinates:
|
||||
return objectToClip * v;
|
||||
}
|
||||
|
||||
void TriangleDrawer::draw_shaded_triangle(const TriVertex *vert, bool ccw, ScreenTriangleDrawerArgs *args, void(*drawfunc)(const ScreenTriangleDrawerArgs *))
|
||||
{
|
||||
// Cull, clip and generate additional vertices as needed
|
||||
TriVertex clippedvert[6];
|
||||
int numclipvert = 0;
|
||||
clipedge(vert[0], vert[1], clippedvert, numclipvert);
|
||||
clipedge(vert[1], vert[2], clippedvert, numclipvert);
|
||||
clipedge(vert[2], vert[0], clippedvert, numclipvert);
|
||||
|
||||
// Map to 2D viewport:
|
||||
for (int j = 0; j < numclipvert; j++)
|
||||
{
|
||||
auto &v = clippedvert[j];
|
||||
|
||||
// Calculate normalized device coordinates:
|
||||
v.w = 1.0f / v.w;
|
||||
v.x *= v.w;
|
||||
v.y *= v.w;
|
||||
v.z *= v.w;
|
||||
|
||||
// Apply viewport scale to get screen coordinates:
|
||||
v.x = viewwidth * (1.0f + v.x) * 0.5f;
|
||||
v.y = viewheight * (1.0f - v.y) * 0.5f;
|
||||
}
|
||||
|
||||
// Draw screen triangles
|
||||
if (ccw)
|
||||
{
|
||||
for (int i = numclipvert; i > 1; i--)
|
||||
{
|
||||
args->v1 = &clippedvert[numclipvert - 1];
|
||||
args->v2 = &clippedvert[i - 1];
|
||||
args->v3 = &clippedvert[i - 2];
|
||||
drawfunc(args);
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
for (int i = 2; i < numclipvert; i++)
|
||||
{
|
||||
args->v1 = &clippedvert[0];
|
||||
args->v2 = &clippedvert[i - 1];
|
||||
args->v3 = &clippedvert[i];
|
||||
drawfunc(args);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
bool TriangleDrawer::cullhalfspace(float clipdistance1, float clipdistance2, float &t1, float &t2)
|
||||
{
|
||||
float d1 = clipdistance1 * (1.0f - t1) + clipdistance2 * t1;
|
||||
float d2 = clipdistance1 * (1.0f - t2) + clipdistance2 * t2;
|
||||
if (d1 < 0.0f && d2 < 0.0f)
|
||||
return true;
|
||||
|
||||
if (d1 < 0.0f)
|
||||
t1 = MAX(-clipdistance1 / (clipdistance2 - clipdistance1), t1);
|
||||
|
||||
if (d2 < 0.0f)
|
||||
t2 = MIN(1.0f + clipdistance2 / (clipdistance1 - clipdistance2), t2);
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
void TriangleDrawer::clipedge(const TriVertex &v1, const TriVertex &v2, TriVertex *clippedvert, int &numclipvert)
|
||||
{
|
||||
// Clip and cull so that the following is true for all vertices:
|
||||
// -v.w <= v.x <= v.w
|
||||
// -v.w <= v.y <= v.w
|
||||
// -v.w <= v.z <= v.w
|
||||
|
||||
float t1 = 0.0f, t2 = 1.0f;
|
||||
bool culled =
|
||||
cullhalfspace(v1.x + v1.w, v2.x + v2.w, t1, t2) ||
|
||||
cullhalfspace(v1.w - v1.x, v2.w - v2.x, t1, t2) ||
|
||||
cullhalfspace(v1.y + v1.w, v2.y + v2.w, t1, t2) ||
|
||||
cullhalfspace(v1.w - v1.y, v2.w - v2.y, t1, t2) ||
|
||||
cullhalfspace(v1.z + v1.w, v2.z + v2.w, t1, t2) ||
|
||||
cullhalfspace(v1.w - v1.z, v2.w - v2.z, t1, t2);
|
||||
if (culled)
|
||||
return;
|
||||
|
||||
if (t1 == 0.0f)
|
||||
{
|
||||
clippedvert[numclipvert++] = v1;
|
||||
}
|
||||
else
|
||||
{
|
||||
auto &v = clippedvert[numclipvert++];
|
||||
v.x = v1.x * (1.0f - t1) + v2.x * t1;
|
||||
v.y = v1.y * (1.0f - t1) + v2.y * t1;
|
||||
v.z = v1.z * (1.0f - t1) + v2.z * t1;
|
||||
v.w = v1.w * (1.0f - t1) + v2.w * t1;
|
||||
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||||
v.varying[i] = v1.varying[i] * (1.0f - t1) + v2.varying[i] * t1;
|
||||
}
|
||||
|
||||
if (t2 != 1.0f)
|
||||
{
|
||||
auto &v = clippedvert[numclipvert++];
|
||||
v.x = v1.x * (1.0f - t2) + v2.x * t2;
|
||||
v.y = v1.y * (1.0f - t2) + v2.y * t2;
|
||||
v.z = v1.z * (1.0f - t2) + v2.z * t2;
|
||||
v.w = v1.w * (1.0f - t2) + v2.w * t2;
|
||||
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||||
v.varying[i] = v1.varying[i] * (1.0f - t2) + v2.varying[i] * t2;
|
||||
}
|
||||
}
|
||||
|
||||
/////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
void ScreenTriangleDrawer::draw(const ScreenTriangleDrawerArgs *args)
|
||||
{
|
||||
uint8_t *dest = args->dest;
|
||||
int pitch = args->pitch;
|
||||
const TriVertex &v1 = *args->v1;
|
||||
const TriVertex &v2 = *args->v2;
|
||||
const TriVertex &v3 = *args->v3;
|
||||
int clipleft = args->clipleft;
|
||||
int clipright = args->clipright;
|
||||
const short *cliptop = args->cliptop;
|
||||
const short *clipbottom = args->clipbottom;
|
||||
const uint8_t *texturePixels = args->texturePixels;
|
||||
int textureWidth = args->textureWidth;
|
||||
int textureHeight = args->textureHeight;
|
||||
|
||||
// 28.4 fixed-point coordinates
|
||||
const int Y1 = (int)round(16.0f * v1.y);
|
||||
const int Y2 = (int)round(16.0f * v2.y);
|
||||
const int Y3 = (int)round(16.0f * v3.y);
|
||||
|
||||
const int X1 = (int)round(16.0f * v1.x);
|
||||
const int X2 = (int)round(16.0f * v2.x);
|
||||
const int X3 = (int)round(16.0f * v3.x);
|
||||
|
||||
// Deltas
|
||||
const int DX12 = X1 - X2;
|
||||
const int DX23 = X2 - X3;
|
||||
const int DX31 = X3 - X1;
|
||||
|
||||
const int DY12 = Y1 - Y2;
|
||||
const int DY23 = Y2 - Y3;
|
||||
const int DY31 = Y3 - Y1;
|
||||
|
||||
// Fixed-point deltas
|
||||
const int FDX12 = DX12 << 4;
|
||||
const int FDX23 = DX23 << 4;
|
||||
const int FDX31 = DX31 << 4;
|
||||
|
||||
const int FDY12 = DY12 << 4;
|
||||
const int FDY23 = DY23 << 4;
|
||||
const int FDY31 = DY31 << 4;
|
||||
|
||||
// Bounding rectangle
|
||||
int clipymin = cliptop[clipleft];
|
||||
int clipymax = clipbottom[clipleft];
|
||||
for (int i = clipleft + 1; i <= clipright; i++)
|
||||
{
|
||||
clipymin = MIN(clipymin, (int)cliptop[i]);
|
||||
clipymax = MAX(clipymax, (int)clipbottom[i]);
|
||||
}
|
||||
int minx = MAX((MIN(MIN(X1, X2), X3) + 0xF) >> 4, clipleft);
|
||||
int maxx = MIN((MAX(MAX(X1, X2), X3) + 0xF) >> 4, clipright);
|
||||
int miny = MAX((MIN(MIN(Y1, Y2), Y3) + 0xF) >> 4, clipymin);
|
||||
int maxy = MIN((MAX(MAX(Y1, Y2), Y3) + 0xF) >> 4, clipymax - 1);
|
||||
if (minx >= maxx || miny >= maxy)
|
||||
return;
|
||||
|
||||
// Block size, standard 8x8 (must be power of two)
|
||||
const int q = 8;
|
||||
|
||||
// Start in corner of 8x8 block
|
||||
minx &= ~(q - 1);
|
||||
miny &= ~(q - 1);
|
||||
|
||||
dest += miny * pitch;
|
||||
|
||||
// Half-edge constants
|
||||
int C1 = DY12 * X1 - DX12 * Y1;
|
||||
int C2 = DY23 * X2 - DX23 * Y2;
|
||||
int C3 = DY31 * X3 - DX31 * Y3;
|
||||
|
||||
// Correct for fill convention
|
||||
if (DY12 < 0 || (DY12 == 0 && DX12 > 0)) C1++;
|
||||
if (DY23 < 0 || (DY23 == 0 && DX23 > 0)) C2++;
|
||||
if (DY31 < 0 || (DY31 == 0 && DX31 > 0)) C3++;
|
||||
|
||||
// Gradients
|
||||
float gradWX = gradx(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.w, v2.w, v3.w);
|
||||
float gradWY = grady(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.w, v2.w, v3.w);
|
||||
float startW = v1.w + gradWX * (minx - v1.x) + gradWY * (miny - v1.y);
|
||||
float gradVaryingX[TriVertex::NumVarying], gradVaryingY[TriVertex::NumVarying], startVarying[TriVertex::NumVarying];
|
||||
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||||
{
|
||||
gradVaryingX[i] = gradx(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.varying[i] * v1.w, v2.varying[i] * v2.w, v3.varying[i] * v3.w);
|
||||
gradVaryingY[i] = grady(v1.x, v1.y, v2.x, v2.y, v3.x, v3.y, v1.varying[i] * v1.w, v2.varying[i] * v2.w, v3.varying[i] * v3.w);
|
||||
startVarying[i] = v1.varying[i] * v1.w + gradVaryingX[i] * (minx - v1.x) + gradVaryingY[i] * (miny - v1.y);
|
||||
}
|
||||
|
||||
// Loop through blocks
|
||||
for (int y = miny; y < maxy; y += q)
|
||||
{
|
||||
for (int x = minx; x < maxx; x += q)
|
||||
{
|
||||
// Corners of block
|
||||
int x0 = x << 4;
|
||||
int x1 = (x + q - 1) << 4;
|
||||
int y0 = y << 4;
|
||||
int y1 = (y + q - 1) << 4;
|
||||
|
||||
// Evaluate half-space functions
|
||||
bool a00 = C1 + DX12 * y0 - DY12 * x0 > 0;
|
||||
bool a10 = C1 + DX12 * y0 - DY12 * x1 > 0;
|
||||
bool a01 = C1 + DX12 * y1 - DY12 * x0 > 0;
|
||||
bool a11 = C1 + DX12 * y1 - DY12 * x1 > 0;
|
||||
int a = (a00 << 0) | (a10 << 1) | (a01 << 2) | (a11 << 3);
|
||||
|
||||
bool b00 = C2 + DX23 * y0 - DY23 * x0 > 0;
|
||||
bool b10 = C2 + DX23 * y0 - DY23 * x1 > 0;
|
||||
bool b01 = C2 + DX23 * y1 - DY23 * x0 > 0;
|
||||
bool b11 = C2 + DX23 * y1 - DY23 * x1 > 0;
|
||||
int b = (b00 << 0) | (b10 << 1) | (b01 << 2) | (b11 << 3);
|
||||
|
||||
bool c00 = C3 + DX31 * y0 - DY31 * x0 > 0;
|
||||
bool c10 = C3 + DX31 * y0 - DY31 * x1 > 0;
|
||||
bool c01 = C3 + DX31 * y1 - DY31 * x0 > 0;
|
||||
bool c11 = C3 + DX31 * y1 - DY31 * x1 > 0;
|
||||
int c = (c00 << 0) | (c10 << 1) | (c01 << 2) | (c11 << 3);
|
||||
|
||||
// Skip block when outside an edge
|
||||
if (a == 0x0 || b == 0x0 || c == 0x0) continue;
|
||||
|
||||
// Check if block needs clipping
|
||||
int clipcount = 0;
|
||||
for (int ix = x; ix < x + q; ix++)
|
||||
{
|
||||
clipcount += (clipleft > ix) || (clipright < ix) || (cliptop[ix] > y) || (clipbottom[ix] <= y + q - 1);
|
||||
}
|
||||
|
||||
// Calculate varying variables for affine block
|
||||
float offx0 = (x - minx) + 0.5f;
|
||||
float offy0 = (y - miny) + 0.5f;
|
||||
float offx1 = offx0 + q;
|
||||
float offy1 = offy0 + q;
|
||||
float rcpWTL = 1.0f / (startW + offx0 * gradWX + offy0 * gradWY);
|
||||
float rcpWTR = 1.0f / (startW + offx1 * gradWX + offy0 * gradWY);
|
||||
float rcpWBL = 1.0f / (startW + offx0 * gradWX + offy1 * gradWY);
|
||||
float rcpWBR = 1.0f / (startW + offx1 * gradWX + offy1 * gradWY);
|
||||
float varyingTL[TriVertex::NumVarying];
|
||||
float varyingTR[TriVertex::NumVarying];
|
||||
float varyingBL[TriVertex::NumVarying];
|
||||
float varyingBR[TriVertex::NumVarying];
|
||||
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||||
{
|
||||
varyingTL[i] = (startVarying[i] + offx0 * gradVaryingX[i] + offy0 * gradVaryingY[i]) * rcpWTL;
|
||||
varyingTR[i] = (startVarying[i] + offx1 * gradVaryingX[i] + offy0 * gradVaryingY[i]) * rcpWTR;
|
||||
varyingBL[i] = ((startVarying[i] + offx0 * gradVaryingX[i] + offy1 * gradVaryingY[i]) * rcpWBL - varyingTL[i]) * (1.0f / q);
|
||||
varyingBR[i] = ((startVarying[i] + offx1 * gradVaryingX[i] + offy1 * gradVaryingY[i]) * rcpWBR - varyingTR[i]) * (1.0f / q);
|
||||
}
|
||||
|
||||
uint8_t *buffer = dest;
|
||||
|
||||
// Accept whole block when totally covered
|
||||
if (a == 0xF && b == 0xF && c == 0xF && clipcount == 0)
|
||||
{
|
||||
for (int iy = 0; iy < q; iy++)
|
||||
{
|
||||
float varying[TriVertex::NumVarying], varyingStep[TriVertex::NumVarying];
|
||||
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||||
{
|
||||
varying[i] = varyingTL[i] + varyingBL[i] * iy;
|
||||
varyingStep[i] = (varyingTR[i] + varyingBR[i] * iy - varying[i]) * (1.0f / q);
|
||||
}
|
||||
|
||||
for (int ix = x; ix < x + q; ix++)
|
||||
{
|
||||
uint32_t ufrac = (uint32_t)((varying[0] - floor(varying[0])) * 0x100000000LL);
|
||||
uint32_t vfrac = (uint32_t)((varying[1] - floor(varying[1])) * 0x100000000LL);
|
||||
//uint32_t light = (uint32_t)clamp(varying[2] * 255.0f + 0.5f, 0.0f, 255.0f);
|
||||
|
||||
uint32_t upos = ((ufrac >> 16) * textureWidth) >> 16;
|
||||
uint32_t vpos = ((vfrac >> 16) * textureHeight) >> 16;
|
||||
uint32_t uvoffset = upos * textureHeight + vpos;
|
||||
|
||||
buffer[ix] = texturePixels[uvoffset];
|
||||
|
||||
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||||
varying[i] += varyingStep[i];
|
||||
}
|
||||
|
||||
buffer += pitch;
|
||||
}
|
||||
}
|
||||
else // Partially covered block
|
||||
{
|
||||
int CY1 = C1 + DX12 * y0 - DY12 * x0;
|
||||
int CY2 = C2 + DX23 * y0 - DY23 * x0;
|
||||
int CY3 = C3 + DX31 * y0 - DY31 * x0;
|
||||
|
||||
for (int iy = 0; iy < q; iy++)
|
||||
{
|
||||
int CX1 = CY1;
|
||||
int CX2 = CY2;
|
||||
int CX3 = CY3;
|
||||
|
||||
float varying[TriVertex::NumVarying], varyingStep[TriVertex::NumVarying];
|
||||
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||||
{
|
||||
varying[i] = varyingTL[i] + varyingBL[i] * iy;
|
||||
varyingStep[i] = (varyingTR[i] + varyingBR[i] * iy - varying[i]) * (1.0f / q);
|
||||
}
|
||||
|
||||
for (int ix = x; ix < x + q; ix++)
|
||||
{
|
||||
bool visible = ix >= clipleft && ix <= clipright && (cliptop[ix] <= y + iy) && (clipbottom[ix] > y + iy);
|
||||
|
||||
if (CX1 > 0 && CX2 > 0 && CX3 > 0 && visible)
|
||||
{
|
||||
uint32_t ufrac = (uint32_t)((varying[0] - floor(varying[0])) * 0x100000000LL);
|
||||
uint32_t vfrac = (uint32_t)((varying[1] - floor(varying[1])) * 0x100000000LL);
|
||||
//uint32_t light = (uint32_t)clamp(varying[2] * 255.0f + 0.5f, 0.0f, 255.0f);
|
||||
|
||||
uint32_t upos = ((ufrac >> 16) * textureWidth) >> 16;
|
||||
uint32_t vpos = ((vfrac >> 16) * textureHeight) >> 16;
|
||||
uint32_t uvoffset = upos * textureHeight + vpos;
|
||||
|
||||
buffer[ix] = texturePixels[uvoffset];
|
||||
}
|
||||
|
||||
for (int i = 0; i < TriVertex::NumVarying; i++)
|
||||
varying[i] += varyingStep[i];
|
||||
|
||||
CX1 -= FDY12;
|
||||
CX2 -= FDY23;
|
||||
CX3 -= FDY31;
|
||||
}
|
||||
|
||||
CY1 += FDX12;
|
||||
CY2 += FDX23;
|
||||
CY3 += FDX31;
|
||||
|
||||
buffer += pitch;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
dest += q * pitch;
|
||||
}
|
||||
}
|
||||
|
||||
void ScreenTriangleDrawer::fill(const ScreenTriangleDrawerArgs *args)
|
||||
{
|
||||
uint8_t *dest = args->dest;
|
||||
int pitch = args->pitch;
|
||||
const TriVertex &v1 = *args->v1;
|
||||
const TriVertex &v2 = *args->v2;
|
||||
const TriVertex &v3 = *args->v3;
|
||||
int clipleft = args->clipleft;
|
||||
int clipright = args->clipright;
|
||||
const short *cliptop = args->cliptop;
|
||||
const short *clipbottom = args->clipbottom;
|
||||
int solidcolor = args->solidcolor;
|
||||
|
||||
// 28.4 fixed-point coordinates
|
||||
const int Y1 = (int)round(16.0f * v1.y);
|
||||
const int Y2 = (int)round(16.0f * v2.y);
|
||||
const int Y3 = (int)round(16.0f * v3.y);
|
||||
|
||||
const int X1 = (int)round(16.0f * v1.x);
|
||||
const int X2 = (int)round(16.0f * v2.x);
|
||||
const int X3 = (int)round(16.0f * v3.x);
|
||||
|
||||
// Deltas
|
||||
const int DX12 = X1 - X2;
|
||||
const int DX23 = X2 - X3;
|
||||
const int DX31 = X3 - X1;
|
||||
|
||||
const int DY12 = Y1 - Y2;
|
||||
const int DY23 = Y2 - Y3;
|
||||
const int DY31 = Y3 - Y1;
|
||||
|
||||
// Fixed-point deltas
|
||||
const int FDX12 = DX12 << 4;
|
||||
const int FDX23 = DX23 << 4;
|
||||
const int FDX31 = DX31 << 4;
|
||||
|
||||
const int FDY12 = DY12 << 4;
|
||||
const int FDY23 = DY23 << 4;
|
||||
const int FDY31 = DY31 << 4;
|
||||
|
||||
// Bounding rectangle
|
||||
int clipymin = cliptop[clipleft];
|
||||
int clipymax = clipbottom[clipleft];
|
||||
for (int i = clipleft + 1; i <= clipright; i++)
|
||||
{
|
||||
clipymin = MIN(clipymin, (int)cliptop[i]);
|
||||
clipymax = MAX(clipymax, (int)clipbottom[i]);
|
||||
}
|
||||
int minx = MAX((MIN(MIN(X1, X2), X3) + 0xF) >> 4, clipleft);
|
||||
int maxx = MIN((MAX(MAX(X1, X2), X3) + 0xF) >> 4, clipright);
|
||||
int miny = MAX((MIN(MIN(Y1, Y2), Y3) + 0xF) >> 4, clipymin);
|
||||
int maxy = MIN((MAX(MAX(Y1, Y2), Y3) + 0xF) >> 4, clipymax - 1);
|
||||
if (minx >= maxx || miny >= maxy)
|
||||
return;
|
||||
|
||||
// Block size, standard 8x8 (must be power of two)
|
||||
const int q = 8;
|
||||
|
||||
// Start in corner of 8x8 block
|
||||
minx &= ~(q - 1);
|
||||
miny &= ~(q - 1);
|
||||
|
||||
dest += miny * pitch;
|
||||
|
||||
// Half-edge constants
|
||||
int C1 = DY12 * X1 - DX12 * Y1;
|
||||
int C2 = DY23 * X2 - DX23 * Y2;
|
||||
int C3 = DY31 * X3 - DX31 * Y3;
|
||||
|
||||
// Correct for fill convention
|
||||
if (DY12 < 0 || (DY12 == 0 && DX12 > 0)) C1++;
|
||||
if (DY23 < 0 || (DY23 == 0 && DX23 > 0)) C2++;
|
||||
if (DY31 < 0 || (DY31 == 0 && DX31 > 0)) C3++;
|
||||
|
||||
// Loop through blocks
|
||||
for (int y = miny; y < maxy; y += q)
|
||||
{
|
||||
for (int x = minx; x < maxx; x += q)
|
||||
{
|
||||
// Corners of block
|
||||
int x0 = x << 4;
|
||||
int x1 = (x + q - 1) << 4;
|
||||
int y0 = y << 4;
|
||||
int y1 = (y + q - 1) << 4;
|
||||
|
||||
// Evaluate half-space functions
|
||||
bool a00 = C1 + DX12 * y0 - DY12 * x0 > 0;
|
||||
bool a10 = C1 + DX12 * y0 - DY12 * x1 > 0;
|
||||
bool a01 = C1 + DX12 * y1 - DY12 * x0 > 0;
|
||||
bool a11 = C1 + DX12 * y1 - DY12 * x1 > 0;
|
||||
int a = (a00 << 0) | (a10 << 1) | (a01 << 2) | (a11 << 3);
|
||||
|
||||
bool b00 = C2 + DX23 * y0 - DY23 * x0 > 0;
|
||||
bool b10 = C2 + DX23 * y0 - DY23 * x1 > 0;
|
||||
bool b01 = C2 + DX23 * y1 - DY23 * x0 > 0;
|
||||
bool b11 = C2 + DX23 * y1 - DY23 * x1 > 0;
|
||||
int b = (b00 << 0) | (b10 << 1) | (b01 << 2) | (b11 << 3);
|
||||
|
||||
bool c00 = C3 + DX31 * y0 - DY31 * x0 > 0;
|
||||
bool c10 = C3 + DX31 * y0 - DY31 * x1 > 0;
|
||||
bool c01 = C3 + DX31 * y1 - DY31 * x0 > 0;
|
||||
bool c11 = C3 + DX31 * y1 - DY31 * x1 > 0;
|
||||
int c = (c00 << 0) | (c10 << 1) | (c01 << 2) | (c11 << 3);
|
||||
|
||||
// Skip block when outside an edge
|
||||
if (a == 0x0 || b == 0x0 || c == 0x0) continue;
|
||||
|
||||
// Check if block needs clipping
|
||||
int clipcount = 0;
|
||||
for (int ix = x; ix < x + q; ix++)
|
||||
{
|
||||
clipcount += (clipleft > ix) || (clipright < ix) || (cliptop[ix] > y) || (clipbottom[ix] <= y + q - 1);
|
||||
}
|
||||
|
||||
uint8_t *buffer = dest;
|
||||
|
||||
// Accept whole block when totally covered
|
||||
if (a == 0xF && b == 0xF && c == 0xF && clipcount == 0)
|
||||
{
|
||||
for (int iy = 0; iy < q; iy++)
|
||||
{
|
||||
for (int ix = x; ix < x + q; ix++)
|
||||
{
|
||||
buffer[ix] = solidcolor;
|
||||
}
|
||||
|
||||
buffer += pitch;
|
||||
}
|
||||
}
|
||||
else // Partially covered block
|
||||
{
|
||||
int CY1 = C1 + DX12 * y0 - DY12 * x0;
|
||||
int CY2 = C2 + DX23 * y0 - DY23 * x0;
|
||||
int CY3 = C3 + DX31 * y0 - DY31 * x0;
|
||||
|
||||
for (int iy = 0; iy < q; iy++)
|
||||
{
|
||||
int CX1 = CY1;
|
||||
int CX2 = CY2;
|
||||
int CX3 = CY3;
|
||||
|
||||
for (int ix = x; ix < x + q; ix++)
|
||||
{
|
||||
bool visible = ix >= clipleft && ix <= clipright && (cliptop[ix] <= y + iy) && (clipbottom[ix] > y + iy);
|
||||
|
||||
if (CX1 > 0 && CX2 > 0 && CX3 > 0 && visible)
|
||||
{
|
||||
buffer[ix] = solidcolor;
|
||||
}
|
||||
|
||||
CX1 -= FDY12;
|
||||
CX2 -= FDY23;
|
||||
CX3 -= FDY31;
|
||||
}
|
||||
|
||||
CY1 += FDX12;
|
||||
CY2 += FDX23;
|
||||
CY3 += FDX31;
|
||||
|
||||
buffer += pitch;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
dest += q * pitch;
|
||||
}
|
||||
}
|
||||
|
||||
float ScreenTriangleDrawer::gradx(float x0, float y0, float x1, float y1, float x2, float y2, float c0, float c1, float c2)
|
||||
{
|
||||
float top = (c1 - c2) * (y0 - y2) - (c0 - c2) * (y1 - y2);
|
||||
float bottom = (x1 - x2) * (y0 - y2) - (x0 - x2) * (y1 - y2);
|
||||
return top / bottom;
|
||||
}
|
||||
|
||||
float ScreenTriangleDrawer::grady(float x0, float y0, float x1, float y1, float x2, float y2, float c0, float c1, float c2)
|
||||
{
|
||||
float top = (c1 - c2) * (x0 - x2) - (c0 - c2) * (x1 - x2);
|
||||
float bottom = -((x1 - x2) * (y0 - y2) - (x0 - x2) * (y1 - y2));
|
||||
return top / bottom;
|
||||
}
|
||||
|
||||
/////////////////////////////////////////////////////////////////////////////
|
||||
|
||||
TriMatrix TriMatrix::null()
|
||||
{
|
||||
TriMatrix m;
|
||||
memset(m.matrix, 0, sizeof(m.matrix));
|
||||
return m;
|
||||
}
|
||||
|
||||
TriMatrix TriMatrix::identity()
|
||||
{
|
||||
TriMatrix m = null();
|
||||
m.matrix[0] = 1.0f;
|
||||
m.matrix[5] = 1.0f;
|
||||
m.matrix[10] = 1.0f;
|
||||
m.matrix[15] = 1.0f;
|
||||
return m;
|
||||
}
|
||||
|
||||
TriMatrix TriMatrix::translate(float x, float y, float z)
|
||||
{
|
||||
TriMatrix m = identity();
|
||||
m.matrix[0 + 3 * 4] = x;
|
||||
m.matrix[1 + 3 * 4] = y;
|
||||
m.matrix[2 + 3 * 4] = z;
|
||||
return m;
|
||||
}
|
||||
|
||||
TriMatrix TriMatrix::scale(float x, float y, float z)
|
||||
{
|
||||
TriMatrix m = null();
|
||||
m.matrix[0 + 0 * 4] = x;
|
||||
m.matrix[1 + 1 * 4] = y;
|
||||
m.matrix[2 + 2 * 4] = z;
|
||||
m.matrix[3 + 3 * 4] = 1;
|
||||
return m;
|
||||
}
|
||||
|
||||
TriMatrix TriMatrix::rotate(float angle, float x, float y, float z)
|
||||
{
|
||||
float c = cosf(angle);
|
||||
float s = sinf(angle);
|
||||
TriMatrix m = null();
|
||||
m.matrix[0 + 0 * 4] = (x*x*(1.0f - c) + c);
|
||||
m.matrix[0 + 1 * 4] = (x*y*(1.0f - c) - z*s);
|
||||
m.matrix[0 + 2 * 4] = (x*z*(1.0f - c) + y*s);
|
||||
m.matrix[1 + 0 * 4] = (y*x*(1.0f - c) + z*s);
|
||||
m.matrix[1 + 1 * 4] = (y*y*(1.0f - c) + c);
|
||||
m.matrix[1 + 2 * 4] = (y*z*(1.0f - c) - x*s);
|
||||
m.matrix[2 + 0 * 4] = (x*z*(1.0f - c) - y*s);
|
||||
m.matrix[2 + 1 * 4] = (y*z*(1.0f - c) + x*s);
|
||||
m.matrix[2 + 2 * 4] = (z*z*(1.0f - c) + c);
|
||||
m.matrix[3 + 3 * 4] = 1.0f;
|
||||
return m;
|
||||
}
|
||||
|
||||
TriMatrix TriMatrix::frustum(float left, float right, float bottom, float top, float near, float far)
|
||||
{
|
||||
float a = (right + left) / (right - left);
|
||||
float b = (top + bottom) / (top - bottom);
|
||||
float c = -(far + near) / (far - near);
|
||||
float d = -(2.0f * far) / (far - near);
|
||||
TriMatrix m = null();
|
||||
m.matrix[0 + 0 * 4] = 2.0f * near / (right - left);
|
||||
m.matrix[1 + 1 * 4] = 2.0f * near / (top - bottom);
|
||||
m.matrix[0 + 2 * 4] = a;
|
||||
m.matrix[1 + 2 * 4] = b;
|
||||
m.matrix[2 + 2 * 4] = c;
|
||||
m.matrix[2 + 3 * 4] = d;
|
||||
m.matrix[3 + 2 * 4] = -1;
|
||||
return m;
|
||||
}
|
||||
|
||||
TriMatrix TriMatrix::worldToView()
|
||||
{
|
||||
TriMatrix m = null();
|
||||
m.matrix[0 + 0 * 4] = (float)ViewSin;
|
||||
m.matrix[0 + 1 * 4] = (float)-ViewCos;
|
||||
m.matrix[1 + 2 * 4] = 1.0f;
|
||||
m.matrix[2 + 0 * 4] = (float)-ViewCos;
|
||||
m.matrix[2 + 1 * 4] = (float)-ViewSin;
|
||||
m.matrix[3 + 3 * 4] = 1.0f;
|
||||
return m * translate((float)-ViewPos.X, (float)-ViewPos.Y, (float)-ViewPos.Z);
|
||||
}
|
||||
|
||||
TriMatrix TriMatrix::viewToClip()
|
||||
{
|
||||
float near = 5.0f;
|
||||
float far = 65536.0f;
|
||||
float width = (float)(FocalTangent * near);
|
||||
float top = (float)(CenterY / InvZtoScale * near);
|
||||
float bottom = (float)(top - viewheight / InvZtoScale * near);
|
||||
return frustum(-width, width, bottom, top, near, far);
|
||||
}
|
||||
|
||||
TriMatrix TriMatrix::operator*(const TriMatrix &mult) const
|
||||
{
|
||||
TriMatrix result;
|
||||
for (int x = 0; x < 4; x++)
|
||||
{
|
||||
for (int y = 0; y < 4; y++)
|
||||
{
|
||||
result.matrix[x + y * 4] =
|
||||
matrix[0 * 4 + x] * mult.matrix[y * 4 + 0] +
|
||||
matrix[1 * 4 + x] * mult.matrix[y * 4 + 1] +
|
||||
matrix[2 * 4 + x] * mult.matrix[y * 4 + 2] +
|
||||
matrix[3 * 4 + x] * mult.matrix[y * 4 + 3];
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
TriVertex TriMatrix::operator*(TriVertex v) const
|
||||
{
|
||||
float vx = matrix[0 * 4 + 0] * v.x + matrix[1 * 4 + 0] * v.y + matrix[2 * 4 + 0] * v.z + matrix[3 * 4 + 0] * v.w;
|
||||
float vy = matrix[0 * 4 + 1] * v.x + matrix[1 * 4 + 1] * v.y + matrix[2 * 4 + 1] * v.z + matrix[3 * 4 + 1] * v.w;
|
||||
float vz = matrix[0 * 4 + 2] * v.x + matrix[1 * 4 + 2] * v.y + matrix[2 * 4 + 2] * v.z + matrix[3 * 4 + 2] * v.w;
|
||||
float vw = matrix[0 * 4 + 3] * v.x + matrix[1 * 4 + 3] * v.y + matrix[2 * 4 + 3] * v.z + matrix[3 * 4 + 3] * v.w;
|
||||
v.x = vx;
|
||||
v.y = vy;
|
||||
v.z = vz;
|
||||
v.w = vw;
|
||||
return v;
|
||||
}
|
||||
109
src/r_triangle.h
Normal file
109
src/r_triangle.h
Normal file
|
|
@ -0,0 +1,109 @@
|
|||
/*
|
||||
** Triangle drawers
|
||||
** Copyright (c) 2016 Magnus Norddahl
|
||||
**
|
||||
** This software is provided 'as-is', without any express or implied
|
||||
** warranty. In no event will the authors be held liable for any damages
|
||||
** arising from the use of this software.
|
||||
**
|
||||
** Permission is granted to anyone to use this software for any purpose,
|
||||
** including commercial applications, and to alter it and redistribute it
|
||||
** freely, subject to the following restrictions:
|
||||
**
|
||||
** 1. The origin of this software must not be misrepresented; you must not
|
||||
** claim that you wrote the original software. If you use this software
|
||||
** in a product, an acknowledgment in the product documentation would be
|
||||
** appreciated but is not required.
|
||||
** 2. Altered source versions must be plainly marked as such, and must not be
|
||||
** misrepresented as being the original software.
|
||||
** 3. This notice may not be removed or altered from any source distribution.
|
||||
**
|
||||
*/
|
||||
|
||||
|
||||
#ifndef __R_TRIANGLE__
|
||||
#define __R_TRIANGLE__
|
||||
|
||||
#include "r_draw.h"
|
||||
|
||||
class FTexture;
|
||||
struct ScreenTriangleDrawerArgs;
|
||||
|
||||
struct TriVertex
|
||||
{
|
||||
TriVertex() { }
|
||||
TriVertex(float x, float y, float z, float w, float u, float v, float light) : x(x), y(y), z(z), w(w) { varying[0] = u; varying[1] = v; varying[2] = light; }
|
||||
|
||||
enum { NumVarying = 3 };
|
||||
float x, y, z, w;
|
||||
float varying[NumVarying];
|
||||
};
|
||||
|
||||
struct TriMatrix
|
||||
{
|
||||
static TriMatrix null();
|
||||
static TriMatrix identity();
|
||||
static TriMatrix translate(float x, float y, float z);
|
||||
static TriMatrix scale(float x, float y, float z);
|
||||
static TriMatrix rotate(float angle, float x, float y, float z);
|
||||
static TriMatrix frustum(float left, float right, float bottom, float top, float near, float far);
|
||||
|
||||
static TriMatrix worldToView(); // Software renderer world to view space transform
|
||||
static TriMatrix viewToClip(); // Software renderer shearing projection
|
||||
|
||||
TriVertex operator*(TriVertex v) const;
|
||||
TriMatrix operator*(const TriMatrix &m) const;
|
||||
|
||||
float matrix[16];
|
||||
};
|
||||
|
||||
enum class TriangleDrawMode
|
||||
{
|
||||
Normal,
|
||||
Fan,
|
||||
Strip
|
||||
};
|
||||
|
||||
class TriangleDrawer
|
||||
{
|
||||
public:
|
||||
static void draw(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture);
|
||||
static void fill(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, int solidcolor);
|
||||
|
||||
private:
|
||||
static TriVertex shade_vertex(const TriMatrix &objectToClip, TriVertex v);
|
||||
static void draw_arrays(const TriMatrix &objectToClip, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture, int solidcolor, void(*drawfunc)(const ScreenTriangleDrawerArgs *));
|
||||
static void draw_shaded_triangle(const TriVertex *vertices, bool ccw, ScreenTriangleDrawerArgs *args, void(*drawfunc)(const ScreenTriangleDrawerArgs *));
|
||||
static bool cullhalfspace(float clipdistance1, float clipdistance2, float &t1, float &t2);
|
||||
static void clipedge(const TriVertex &v1, const TriVertex &v2, TriVertex *clippedvert, int &numclipvert);
|
||||
};
|
||||
|
||||
struct ScreenTriangleDrawerArgs
|
||||
{
|
||||
uint8_t *dest;
|
||||
int pitch;
|
||||
TriVertex *v1;
|
||||
TriVertex *v2;
|
||||
TriVertex *v3;
|
||||
int clipleft;
|
||||
int clipright;
|
||||
const short *cliptop;
|
||||
const short *clipbottom;
|
||||
const uint8_t *texturePixels;
|
||||
int textureWidth;
|
||||
int textureHeight;
|
||||
int solidcolor;
|
||||
};
|
||||
|
||||
class ScreenTriangleDrawer
|
||||
{
|
||||
public:
|
||||
static void draw(const ScreenTriangleDrawerArgs *args);
|
||||
static void fill(const ScreenTriangleDrawerArgs *args);
|
||||
|
||||
private:
|
||||
static float gradx(float x0, float y0, float x1, float y1, float x2, float y2, float c0, float c1, float c2);
|
||||
static float grady(float x0, float y0, float x1, float y1, float x2, float y2, float c0, float c1, float c2);
|
||||
};
|
||||
|
||||
#endif
|
||||
Loading…
Reference in a new issue