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Set initial value of oFog.x to 1.0

This commit is contained in:
Jannik Vogel 2015-09-10 17:52:48 +02:00
parent f379d5da7b
commit 97be3f5986
1 changed files with 15 additions and 1 deletions
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16
hw/xbox/nv2a_shaders.c
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@ -588,7 +588,21 @@ static QString *generate_vertex_shader(const ShaderState state,
"vec4 oB0 = vec4(0.0,0.0,0.0,1.0);\n"
"vec4 oB1 = vec4(0.0,0.0,0.0,1.0);\n"
"vec4 oPts = vec4(0.0,0.0,0.0,1.0);\n"
"vec4 oFog = vec4(0.0,0.0,0.0,1.0);\n"
/* FIXME: NV_vertex_program says: "FOGC is the transformed vertex's fog
* coordinate. The register's first floating-point component is interpolated
* across the assembled primitive during rasterization and used as the fog
* distance to compute per-fragment the fog factor when fog is enabled.
* However, if both fog and vertex program mode are enabled, but the FOGC
* vertex result register is not written, the fog factor is overridden to
* 1.0. The register's other three components are ignored."
*
* That probably means it will read back as vec4(0.0, 0.0, 0.0, 1.0) but
* will be set to 1.0 AFTER the VP if it was never written?
* We should test on real hardware..
*
* We'll force 1.0 for oFog.x for now.
*/
"vec4 oFog = vec4(1.0,0.0,0.0,1.0);\n"
"vec4 oT0 = vec4(0.0,0.0,0.0,1.0);\n"
"vec4 oT1 = vec4(0.0,0.0,0.0,1.0);\n"
"vec4 oT2 = vec4(0.0,0.0,0.0,1.0);\n"