Use NV_PGRAPH_ZCLIPMIN as threshold for undoing perspective divide

backgamon · Jan 4, 2025 · 6f4a9b1 · 6f4a9b1
1 parent aa084b9
commit 6f4a9b1
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Showing 2 changed files with 2 additions and 2 deletions.
diff --git a/hw/xbox/nv2a/pgraph/glsl/psh.c b/hw/xbox/nv2a/pgraph/glsl/psh.c
@@ -1219,7 +1219,7 @@ static MString *psh_convert(struct PixelShader *ps, bool z_perspective)
     }
 
     if (z_perspective) {     
-        mstring_append(ps->code, "gl_FragDepth = (1.0/gl_FragCoord.w)/clipRange.y;\n");
+        mstring_append(ps->code, "gl_FragDepth = 1.0/(gl_FragCoord.w * clipRange.y);\n");
     }
 
     for (i = 0; i < ps->num_var_refs; i++) {

diff --git a/hw/xbox/nv2a/pgraph/glsl/vsh-prog.c b/hw/xbox/nv2a/pgraph/glsl/vsh-prog.c
@@ -879,7 +879,7 @@ void pgraph_gen_vsh_prog_glsl(uint16_t version,
             body,
 
         /* Correct for the perspective divide */
-        "  if (oPos.w < 0.0) {\n"
+        "  if (oPos.w < clipRange.z) {\n"
             /* undo the perspective divide in the case where the point would be
              * clipped so opengl can clip it correctly */
         "    oPos.xyz *= oPos.w;\n"