mirror of
https://github.com/ZDoom/gzdoom-gles.git
synced 2024-11-11 15:22:15 +00:00
More triangle rendering
This commit is contained in:
Magnus Norddahl
parent
68efdf5cef
commit
ef70ba0985
1 changed files with 205 additions and 24 deletions
|
|
@ -39,6 +39,7 @@
|
|||
#include "r_plane.h"
|
||||
#include "r_draw_rgba.h"
|
||||
#include "r_compiler/llvmdrawers.h"
|
||||
#include "gl/data/gl_matrix.h"
|
||||
|
||||
#include "gi.h"
|
||||
#include "stats.h"
|
||||
|
|
@ -1258,6 +1259,9 @@ void ApplySpecialColormapRGBACommand::Execute(DrawerThread *thread)
|
|||
|
||||
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];
|
||||
|
|
@ -1307,10 +1311,12 @@ void triangle(uint32_t *dest, int pitch, const TriVertex &v1, const TriVertex &v
|
|||
const int FDY31 = DY31 << 4;
|
||||
|
||||
// Bounding rectangle
|
||||
int minx = (MIN(MIN(X1, X2), X3) + 0xF) >> 4;
|
||||
int maxx = (MAX(MAX(X1, X2), X3) + 0xF) >> 4;
|
||||
int miny = (MIN(MIN(Y1, Y2), Y3) + 0xF) >> 4;
|
||||
int maxy = (MAX(MAX(Y1, Y2), Y3) + 0xF) >> 4;
|
||||
int minx = MAX((MIN(MIN(X1, X2), X3) + 0xF) >> 4, 0);
|
||||
int maxx = MIN((MAX(MAX(X1, X2), X3) + 0xF) >> 4, viewwidth);
|
||||
int miny = MAX((MIN(MIN(Y1, Y2), Y3) + 0xF) >> 4, 0);
|
||||
int maxy = MIN((MAX(MAX(Y1, Y2), Y3) + 0xF) >> 4, viewheight);
|
||||
if (minx >= maxx || miny >= maxy)
|
||||
return;
|
||||
|
||||
// Block size, standard 8x8 (must be power of two)
|
||||
const int q = 8;
|
||||
|
|
@ -1477,30 +1483,205 @@ void triangle(uint32_t *dest, int pitch, const TriVertex &v1, const TriVertex &v
|
|||
}
|
||||
}
|
||||
|
||||
bool cullhalfspace(float clipdistance1, float clipdistance2, float &t1, float &t2)
|
||||
{
|
||||
if (clipdistance1 < 0.0f && clipdistance2 < 0.0f)
|
||||
return true;
|
||||
|
||||
if (clipdistance1 < 0.0f)
|
||||
t1 = MAX(-clipdistance1 / (clipdistance2 - clipdistance1), t1);
|
||||
|
||||
if (clipdistance2 < 0.0f)
|
||||
t2 = MIN(1.0f - clipdistance2 / (clipdistance1 - clipdistance2), t2);
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
void 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 R_DrawTriangle()
|
||||
{
|
||||
TriVertex trivert[6];
|
||||
TriVertex cube[6 * 6] =
|
||||
{
|
||||
{-1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
trivert[0].x = 100;
|
||||
trivert[0].y = 350;
|
||||
trivert[0].w = 1.0f;
|
||||
trivert[0].varying[0] = 0.0f;
|
||||
trivert[0].varying[1] = 1.0f;
|
||||
trivert[0].varying[2] = 0.0f;
|
||||
trivert[1].x = 400;
|
||||
trivert[1].y = 500;
|
||||
trivert[1].w = 1.0f;
|
||||
trivert[1].varying[0] = 1.0f;
|
||||
trivert[1].varying[1] = 0.0f;
|
||||
trivert[1].varying[2] = 0.0f;
|
||||
trivert[2].x = 200;
|
||||
trivert[2].y = 200;
|
||||
trivert[2].w = 1.0f;
|
||||
trivert[2].varying[0] = 0.0f;
|
||||
trivert[2].varying[1] = 0.0f;
|
||||
trivert[2].varying[2] = 1.0f;
|
||||
{ 1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
triangle((uint32_t*)dc_destorg, dc_pitch, trivert[0], trivert[1], trivert[2]);
|
||||
|
||||
{ 1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
{-1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
|
||||
{ 1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
{-1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
|
||||
{-1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
{ 1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
|
||||
{ 1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
{ 1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{ 1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
|
||||
{-1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
|
||||
{-1.0f, -1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, -1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f },
|
||||
{-1.0f, 1.0f, -1.0f, 1.0f, 0.0f, 0.0f, 0.0f }
|
||||
};
|
||||
|
||||
for (int i = 0; i < 6; i++)
|
||||
{
|
||||
cube[i * 6 + 0].varying[0] = 1.0f;
|
||||
cube[i * 6 + 1].varying[1] = 1.0f;
|
||||
cube[i * 6 + 2].varying[2] = 1.0f;
|
||||
cube[i * 6 + 3].varying[2] = 1.0f;
|
||||
cube[i * 6 + 4].varying[0] = 1.0f;
|
||||
cube[i * 6 + 4].varying[1] = 1.0f;
|
||||
cube[i * 6 + 4].varying[2] = 1.0f;
|
||||
cube[i * 6 + 5].varying[0] = 1.0f;
|
||||
}
|
||||
|
||||
static float angle = 0.0f;
|
||||
angle = fmod(angle + 0.5f, 360.0f);
|
||||
VSMatrix objectToWorld(0);
|
||||
objectToWorld.translate((float)ViewPos.X, (float)ViewPos.Y + 5.0f, (float)ViewPos.Z);
|
||||
objectToWorld.rotate(angle, 0.57735f, 0.57735f, 0.57735f);
|
||||
|
||||
TriVertex *vinput = cube;
|
||||
for (int i = 0; i < 6 * 6 / 3; i++)
|
||||
{
|
||||
TriVertex vert[3];
|
||||
|
||||
// Vertex shader stuff:
|
||||
for (int j = 0; j < 3; j++)
|
||||
{
|
||||
auto &v = vert[j];
|
||||
v = *(vinput++);
|
||||
|
||||
// Apply object to world transform:
|
||||
const float *matrix = objectToWorld.get();
|
||||
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;
|
||||
|
||||
// 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;
|
||||
v.y = (float)tr_z;
|
||||
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
|
||||
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 * CenterX);
|
||||
v.y = (float)(CenterY - v.y * InvZtoScale);
|
||||
}
|
||||
|
||||
for (int i = numclipvert; i > 1; i--)
|
||||
{
|
||||
triangle((uint32_t*)dc_destorg, dc_pitch, clippedvert[numclipvert - 1], clippedvert[i - 1], clippedvert[i - 2]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/////////////////////////////////////////////////////////////////////////////
|
||||
|
|
|
|||
Loading…
Reference in a new issue