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implement clipping & alpha testing

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This commit is contained in:
Samuliak 2024-07-04 10:36:25 +02:00
parent c5bdb28ca1
commit e8727d5dbd
1 changed files with 53 additions and 4 deletions
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57
src/host_shaders/metal_shaders.metal
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@ -110,6 +110,11 @@ struct DrawVertexOut {
float4 textureEnvBufferColor [[flat]];
};
struct DrawVertexOutWithClip {
DrawVertexOut out;
float clipDistance [[clip_distance]] [2];
};
float3 rotateFloat3ByQuaternion(float3 v, float4 q) {
float3 u = q.xyz;
float s = q.w;
@ -138,7 +143,7 @@ float decodeFP(uint hex, uint E, uint M) {
return as_type<float>(hex);
}
vertex DrawVertexOut vertexDraw(DrawVertexIn in [[stage_in]], constant PicaRegs& picaRegs [[buffer(0)]], constant VertTEV& tev [[buffer(1)]]) {
vertex DrawVertexOutWithClip vertexDraw(DrawVertexIn in [[stage_in]], constant PicaRegs& picaRegs [[buffer(0)]], constant VertTEV& tev [[buffer(1)]]) {
DrawVertexOut out;
// Position
@ -176,9 +181,20 @@ vertex DrawVertexOut vertexDraw(DrawVertexIn in [[stage_in]], constant PicaRegs&
out.textureEnvBufferColor = abgr8888ToFloat4(picaRegs.read(0xFDu));
// TODO: clipping
DrawVertexOutWithClip outWithClip;
outWithClip.out = out;
return out;
// Parse clipping plane registers
float4 clipData = float4(
decodeFP(picaRegs.read(0x48u) & 0xffffffu, 7u, 16u), decodeFP(picaRegs.read(0x49u) & 0xffffffu, 7u, 16u),
decodeFP(picaRegs.read(0x4Au) & 0xffffffu, 7u, 16u), decodeFP(picaRegs.read(0x4Bu) & 0xffffffu, 7u, 16u)
);
// There's also another, always-on clipping plane based on vertex z
outWithClip.clipDistance[0] = -in.position.z;
outWithClip.clipDistance[1] = dot(clipData, in.position);
return outWithClip;
}
struct Globals {
@ -546,5 +562,38 @@ fragment float4 fragmentDraw(DrawVertexOut in [[stage_in]], float4 prevColor [[c
// TODO: depth
return performLogicOp(logicOp, globals.tevSources[15], prevColor);
float4 color = performLogicOp(logicOp, globals.tevSources[15], prevColor);
// Perform alpha test
uint alphaControl = picaRegs.read(0x104u);
if ((alphaControl & 1u) != 0u) { // Check if alpha test is on
uint func = (alphaControl >> 4u) & 7u;
float reference = float((alphaControl >> 8u) & 0xffu) / 255.0;
float alpha = color.a;
switch (func) {
case 0u: discard_fragment(); // Never pass alpha test
case 1u: break; // Always pass alpha test
case 2u: // Pass if equal
if (alpha != reference) discard_fragment();
break;
case 3u: // Pass if not equal
if (alpha == reference) discard_fragment();
break;
case 4u: // Pass if less than
if (alpha >= reference) discard_fragment();
break;
case 5u: // Pass if less than or equal
if (alpha > reference) discard_fragment();
break;
case 6u: // Pass if greater than
if (alpha <= reference) discard_fragment();
break;
case 7u: // Pass if greater than or equal
if (alpha < reference) discard_fragment();
break;
}
}
return color;
}