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Merge pull request #21787 from hrydgard/depth-round-15-bit

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Truncate depth to 15 bits when our compatibility flag for depth rounding is set
This commit is contained in:
Henrik Rydgård
2026-06-05 01:50:29 +02:00
committed by GitHub
parent ca4eb8e95e 9ce5270e80
commit 7d7985ec3b
1 changed files with 5 additions and 3 deletions
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GPU/Common/VertexShaderGenerator.cpp
+5 -3
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@@ -1255,7 +1255,7 @@ bool GenerateVertexShader(const VShaderID &id, char *buffer, const ShaderLanguag
// We should probably store the undivided outPos in a variable.
// We round to nearest 15-bit value for the check - this seems to match some of [Unknown]'s test, and PSP GPU floats
// often have a 15-bit mantissa.
// often have a 15-bit mantissa. TODO: should we truncate or nearest?
WRITE(p, " float clipZ = floor(outPos.z * 0.5 + 0.5) * 2.0;\n");
WRITE(p, " %sgl_ClipDistance%s = u_minZmaxZ.x > 0.0 ? (clipZ - u_minZmaxZ.x) * outPos.w : 1.0;\n", compat.vsOutPrefix, minZClipPlaneSuffix);
@@ -1266,10 +1266,12 @@ bool GenerateVertexShader(const VShaderID &id, char *buffer, const ShaderLanguag
WRITE(p, " outPos.xy = ((outPos.xy - u_xywh.xy) / u_xywh.zw) * 2.0 - 1.0;\n");
if (gstate_c.Use(GPU_ROUND_DEPTH_TO_16BIT)) {
WRITE(p, " outPos.z = float(int(outPos.z));\n");
// Actually 15-bit. Truncate here fixes Afterburner (similarly to the min/max clipping above).
// Possibly this should only be 15-bit in transformed mode? Full 16 in through? needs hardware testing.
WRITE(p, " outPos.z = floor(outPos.z * 0.5) * 2.0;\n");
}
WRITE(p, " outPos.z = outPos.z / 65536.0;\n"); // Or 65536?
WRITE(p, " outPos.z = outPos.z / 65535.0;\n"); // Or 65535?
// Convert back to clip space coordinates. This is needed for all modern shader models.
// After all our work in projected space, multiply xyz back with z to the get clip space position that the shader model wants.