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Avoid a per-pixel branch in SoftMin GPU renderer

This commit is contained in:
UnknownShadow200 2025-11-11 21:51:40 +11:00
parent 01ff9ecdc3
commit 900d76d94c
2 changed files with 29 additions and 23 deletions
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38
src/Graphics_SoftMin.c
View File

@ -480,32 +480,24 @@ static void DrawTriangle3D(Vertex* V0, Vertex* V1, Vertex* V2) {
}
if (gfx_alphaTest && A == 0) return;
color = BitmapCol_Make(R, G, B, 0xFF);
for (y = minY; y <= maxY; y++, bc0_start += dy12, bc1_start += dy20, bc2_start += dy01)
{
int bc0 = bc0_start;
int bc1 = bc1_start;
int bc2 = bc2_start;
if (!gfx_alphaBlend) {
#define PIXEL_PLOT_FUNC(index, x, y) \
colorBuffer[index] = color;
for (x = minX; x <= maxX; x++, bc0 += dx12, bc1 += dx20, bc2 += dx01)
{
if ((bc0 | bc1 | bc2) < 0) continue;
int cb_index = y * cb_stride + x;
if (!gfx_alphaBlend) {
colorBuffer[cb_index] = color;
continue;
}
color = BitmapCol_Make(R, G, B, 0xFF);
#include "Graphics_SoftMin.tri.i"
} else {
// Hardcode for alpha of 128
#define PIXEL_PLOT_FUNC(index, x, y) \
BitmapCol dst = colorBuffer[index]; \
int finR = (R + BitmapCol_R(dst)) >> 1; \
int finG = (G + BitmapCol_G(dst)) >> 1; \
int finB = (B + BitmapCol_B(dst)) >> 1; \
colorBuffer[index] = BitmapCol_Make(finR, finG, finB, 0xFF);
// Hardcode for alpha of 128
BitmapCol dst = colorBuffer[cb_index];
int finR = (R + BitmapCol_R(dst)) >> 1;
int finG = (G + BitmapCol_G(dst)) >> 1;
int finB = (B + BitmapCol_B(dst)) >> 1;
colorBuffer[cb_index] = BitmapCol_Make(finR, finG, finB, 0xFF);
}
#include "Graphics_SoftMin.tri.i"
}
}

14
src/Graphics_SoftMin.tri.i Normal file
View File

@ -0,0 +1,14 @@
for (y = minY; y <= maxY; y++, bc0_start += dy12, bc1_start += dy20, bc2_start += dy01)
{
int bc0 = bc0_start;
int bc1 = bc1_start;
int bc2 = bc2_start;
for (x = minX; x <= maxX; x++, bc0 += dx12, bc1 += dx20, bc2 += dx01)
{
if ((bc0 | bc1 | bc2) < 0) continue;
int cb_index = y * cb_stride + x;
PIXEL_PLOT_FUNC(cb_index, x, y);
}
}