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SoftGPU: Sort of renders properly now

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UnknownShadow200 2024-04-13 16:39:07 +10:00
parent de69850731
commit 1a82ef84ce
1 changed files with 7 additions and 4 deletions
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11
src/Graphics_SoftGPU.c
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@ -137,7 +137,7 @@ void Gfx_ClearBuffers(GfxBuffers buffers) {
for (i = 0; i < size; i++) colorBuffer[i] = clearColor;
}
if (buffers & GFX_BUFFER_DEPTH) {
for (i = 0; i < size; i++) depthBuffer[i] = 1.0f;
for (i = 0; i < size; i++) depthBuffer[i] = 100000000.0f;
}
}
@ -341,7 +341,7 @@ static void DrawTriangle(Vector4 frag1, Vector4 frag2, Vector4 frag3,
if (faceCulling) {
// https://gamedev.stackexchange.com/questions/203694/how-to-make-backface-culling-work-correctly-in-both-orthographic-and-perspective
int sign = (x2 - x1) * (y3 - y1) - (x3 - x1) * (y2 - y1);
if (sign < 0) return;
if (sign > 0) return;
}
// Reject triangles completely outside
@ -351,14 +351,17 @@ static void DrawTriangle(Vector4 frag1, Vector4 frag2, Vector4 frag3,
// Perform scissoring
minX = max(minX, 0); maxX = min(maxX, sc_maxX);
minY = max(minY, 0); maxY = min(maxY, sc_maxY);
// TODO why doesn't this work
// NOTE: W in frag variables below is actually 1/W
float factor = 1.0f / ((y2 - y3) * (x1 - x3) + (x3 - x2) * (y1 - y3));
// TODO proper clipping
if (frag1.w <= 0 || frag2.w <= 0 || frag3.w <= 0) return;
for (int y = minY; y <= maxY; y++) {
for (int x = minX; x <= maxX; x++) {
float ic0 = ((y2 - y3) * (x - x3) + (x3 - x2) * (y - y3)) * factor;
if (ic0 < 0 || ic0 > 1) continue;
float ic1 = ((y3 - y1) * (x - x3) + (x1 - x3) * (y - y3)) * factor;
if (ic1 < 0 || ic1 > 1) continue;
@ -369,7 +372,7 @@ static void DrawTriangle(Vector4 frag1, Vector4 frag2, Vector4 frag3,
float w = 1 / (ic0 * frag1.w + ic1 * frag2.w + ic2 * frag3.w);
float z = (ic0 * frag1.z + ic1 * frag2.z + ic2 * frag3.z) * w;
if (depthTest && (z < 0 || z <= depthBuffer[index])) continue;
if (depthTest && (z < 0 || z > depthBuffer[index])) continue;
if (depthWrite) depthBuffer[index] = z;
if (!colWrite) continue;