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fix: depth transform

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This commit is contained in:
Samuliak 2024-07-05 09:44:16 +02:00
parent b8e155bd4a
commit 5741de2cad
1 changed files with 12 additions and 10 deletions
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22
src/host_shaders/metal_shaders.metal
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@ -149,6 +149,16 @@ struct DepthUniforms {
bool depthMapEnable; bool depthMapEnable;
}; };
// TODO: check this
float transformZ(float z, float w, constant DepthUniforms& depthUniforms) {
z = z / w * depthUniforms.depthScale + depthUniforms.depthOffset;
if (!depthUniforms.depthMapEnable) {
z *= w;
}
return z * w;
}
vertex DrawVertexOutWithClip vertexDraw(DrawVertexIn in [[stage_in]], constant PicaRegs& picaRegs [[buffer(0)]], constant VertTEV& tev [[buffer(1)]], constant DepthUniforms& depthUniforms [[buffer(2)]]) { vertex DrawVertexOutWithClip vertexDraw(DrawVertexIn in [[stage_in]], constant PicaRegs& picaRegs [[buffer(0)]], constant VertTEV& tev [[buffer(1)]], constant DepthUniforms& depthUniforms [[buffer(2)]]) {
DrawVertexOut out; DrawVertexOut out;
@ -156,18 +166,9 @@ vertex DrawVertexOutWithClip vertexDraw(DrawVertexIn in [[stage_in]], constant P
out.position = in.position; out.position = in.position;
// Flip the y position // Flip the y position
out.position.y = -out.position.y; out.position.y = -out.position.y;
out.position.xy /= out.position.w;
// Apply depth uniforms // Apply depth uniforms
out.position.z = out.position.z * depthUniforms.depthScale + depthUniforms.depthOffset; out.position.z = transformZ(out.position.z, out.position.w, depthUniforms);
// TODO: is this correct?
if (depthUniforms.depthMapEnable) { // Divide z by w if depthmap enable == 0 (ie using W-buffering)
out.position.z /= out.position.w;
}
// in.position.z is in range of [-1, 1], convert it to [0, 1]
out.position.z = (out.position.z + 1.0) * 0.5;
out.position.w = 1.0;
// Color // Color
out.color = min(abs(in.color), 1.0); out.color = min(abs(in.color), 1.0);
@ -205,6 +206,7 @@ vertex DrawVertexOutWithClip vertexDraw(DrawVertexIn in [[stage_in]], constant P
); );
// There's also another, always-on clipping plane based on vertex z // There's also another, always-on clipping plane based on vertex z
// TODO: transform
outWithClip.clipDistance[0] = -in.position.z; outWithClip.clipDistance[0] = -in.position.z;
outWithClip.clipDistance[1] = dot(clipData, in.position); outWithClip.clipDistance[1] = dot(clipData, in.position);