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Add triangle fan and strip

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This commit is contained in:
Magnus Norddahl 2016-10-31 08:30:08 +01:00
parent a1ba371eed
commit 7a9c674f83
2 changed files with 130 additions and 88 deletions
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203
src/r_triangle.cpp
View file

@ -36,110 +36,143 @@
#include "r_data/colormaps.h" #include "r_data/colormaps.h"
#include "r_triangle.h" #include "r_triangle.h"
void TriangleDrawer::draw(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture) void TriangleDrawer::draw(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture)
{ {
draw_any(objectToWorld, vinput, vcount, ccw, clipleft, clipright, cliptop, clipbottom, texture, 0, &ScreenTriangleDrawer::draw); draw_arrays(objectToWorld, vinput, vcount, mode, ccw, clipleft, clipright, cliptop, clipbottom, texture, 0, &ScreenTriangleDrawer::draw);
} }
void TriangleDrawer::fill(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, int solidcolor) void TriangleDrawer::fill(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, int solidcolor)
{ {
draw_any(objectToWorld, vinput, vcount, ccw, clipleft, clipright, cliptop, clipbottom, nullptr, solidcolor, &ScreenTriangleDrawer::fill); draw_arrays(objectToWorld, vinput, vcount, mode, ccw, clipleft, clipright, cliptop, clipbottom, nullptr, solidcolor, &ScreenTriangleDrawer::fill);
} }
void TriangleDrawer::draw_any(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture, int solidcolor, void(*drawfunc)(const ScreenTriangleDrawerArgs *)) void TriangleDrawer::draw_arrays(const TriMatrix &objectToWorld, 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 *))
{ {
for (int i = 0; i < vcount / 3; i++) if (vcount < 3)
return;
ScreenTriangleDrawerArgs args;
args.dest = dc_destorg;
args.pitch = dc_pitch;
args.clipleft = clipleft;
args.clipright = clipright;
args.cliptop = cliptop;
args.clipbottom = clipbottom;
if (texture)
{ {
TriVertex vert[3]; args.textureWidth = texture->GetWidth();
args.textureHeight = texture->GetHeight();
args.texturePixels = texture->GetPixels();
}
else
{
args.textureWidth = 0;
args.textureHeight = 0;
args.texturePixels = nullptr;
}
args.solidcolor = solidcolor;
// Vertex shader stuff: TriVertex vert[3];
for (int j = 0; j < 3; j++) if (mode == TriangleDrawMode::Normal)
{
for (int i = 0; i < vcount / 3; i++)
{ {
auto &v = vert[j]; for (int j = 0; j < 3; j++)
v = *(vinput++); vert[j] = shade_vertex(objectToWorld, *(vinput++));
draw_shaded_triangle(vert, ccw, &args, drawfunc);
// Apply transform to get world coordinates:
v = objectToWorld * v;
// The software renderer world to clip transform:
double nearp = 5.0f;
double farp = 65536.f;
double tr_x = v.x - ViewPos.X;
double tr_y = v.y - ViewPos.Y;
double tr_z = v.z - ViewPos.Z;
double tx = tr_x * ViewSin - tr_y * ViewCos;
double tz = tr_x * ViewTanCos + tr_y * ViewTanSin;
v.x = (float)tx * 0.5f;
v.y = (float)tr_z * 0.5f;
v.z = (float)((-tz * (farp + nearp) / (nearp - farp) + (2.0f * farp * nearp) / (nearp - farp)));
v.w = (float)tz;
} }
}
// Cull, clip and generate additional vertices as needed else if (mode == TriangleDrawMode::Fan)
TriVertex clippedvert[6]; {
int numclipvert = 0; vert[0] = shade_vertex(objectToWorld, *(vinput++));
clipedge(vert[0], vert[1], clippedvert, numclipvert); vert[1] = shade_vertex(objectToWorld, *(vinput++));
clipedge(vert[1], vert[2], clippedvert, numclipvert); for (int i = 2; i < vcount; i++)
clipedge(vert[2], vert[0], clippedvert, numclipvert);
// Map to 2D viewport:
for (int j = 0; j < numclipvert; j++)
{ {
auto &v = clippedvert[j]; vert[2] = shade_vertex(objectToWorld, *(vinput++));
draw_shaded_triangle(vert, ccw, &args, drawfunc);
// Calculate normalized device coordinates: vert[1] = vert[2];
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 = (float)(CenterX + v.x * 2.0f * CenterX);
v.y = (float)(CenterY - v.y * 2.0f * InvZtoScale);
} }
}
// Draw screen triangles else // TriangleDrawMode::Strip
{
ScreenTriangleDrawerArgs args; vert[0] = shade_vertex(objectToWorld, *(vinput++));
args.dest = dc_destorg; vert[1] = shade_vertex(objectToWorld, *(vinput++));
args.pitch = dc_pitch; for (int i = 2; i < vcount; i++)
args.clipleft = clipleft;
args.clipright = clipright;
args.cliptop = cliptop;
args.clipbottom = clipbottom;
if (texture)
{ {
args.textureWidth = texture->GetWidth(); vert[2] = shade_vertex(objectToWorld, *(vinput++));
args.textureHeight = texture->GetHeight(); draw_shaded_triangle(vert, ccw, &args, drawfunc);
args.texturePixels = texture->GetPixels(); vert[0] = vert[1];
vert[1] = vert[2];
ccw = !ccw;
} }
else }
{ }
args.textureWidth = 0;
args.textureHeight = 0;
args.texturePixels = nullptr;
}
args.solidcolor = solidcolor;
if (ccw) TriVertex TriangleDrawer::shade_vertex(const TriMatrix &objectToWorld, TriVertex v)
{
// Apply transform to get world coordinates:
v = objectToWorld * v;
// The software renderer world to clip transform:
double nearp = 5.0f;
double farp = 65536.f;
double tr_x = v.x - ViewPos.X;
double tr_y = v.y - ViewPos.Y;
double tr_z = v.z - ViewPos.Z;
double tx = tr_x * ViewSin - tr_y * ViewCos;
double tz = tr_x * ViewTanCos + tr_y * ViewTanSin;
v.x = (float)tx * 0.5f;
v.y = (float)tr_z * 0.5f;
v.z = (float)((-tz * (farp + nearp) / (nearp - farp) + (2.0f * farp * nearp) / (nearp - farp)));
v.w = (float)tz;
return 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 = (float)(CenterX + v.x * 2.0f * CenterX);
v.y = (float)(CenterY - v.y * 2.0f * InvZtoScale);
}
// Draw screen triangles
if (ccw)
{
for (int i = numclipvert; i > 1; i--)
{ {
for (int i = numclipvert; i > 1; i--) args->v1 = &clippedvert[numclipvert - 1];
{ args->v2 = &clippedvert[i - 1];
args.v1 = &clippedvert[numclipvert - 1]; args->v3 = &clippedvert[i - 2];
args.v2 = &clippedvert[i - 1]; drawfunc(args);
args.v3 = &clippedvert[i - 2];
drawfunc(&args);
}
} }
else }
else
{
for (int i = 2; i < numclipvert; i++)
{ {
for (int i = 2; i < numclipvert; i++) args->v1 = &clippedvert[0];
{ args->v2 = &clippedvert[i - 1];
args.v1 = &clippedvert[0]; args->v3 = &clippedvert[i];
args.v2 = &clippedvert[i - 1]; drawfunc(args);
args.v3 = &clippedvert[i];
drawfunc(&args);
}
} }
} }
} }

15
src/r_triangle.h
View file

@ -53,14 +53,23 @@ struct TriMatrix
float matrix[16]; float matrix[16];
}; };
enum class TriangleDrawMode
{
Normal,
Fan,
Strip
};
class TriangleDrawer class TriangleDrawer
{ {
public: public:
static void draw(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture); static void draw(const TriMatrix &objectToWorld, 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 &objectToWorld, const TriVertex *vinput, int vcount, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, int solidcolor); static void fill(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, TriangleDrawMode mode, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, int solidcolor);
private: private:
static void draw_any(const TriMatrix &objectToWorld, const TriVertex *vinput, int vcount, bool ccw, int clipleft, int clipright, const short *cliptop, const short *clipbottom, FTexture *texture, int solidcolor, void(*drawfunc)(const ScreenTriangleDrawerArgs *)); static TriVertex shade_vertex(const TriMatrix &objectToWorld, TriVertex v);
static void draw_arrays(const TriMatrix &objectToWorld, 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 bool cullhalfspace(float clipdistance1, float clipdistance2, float &t1, float &t2);
static void clipedge(const TriVertex &v1, const TriVertex &v2, TriVertex *clippedvert, int &numclipvert); static void clipedge(const TriVertex &v1, const TriVertex &v2, TriVertex *clippedvert, int &numclipvert);
}; };