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Shader simplification: Get rid of lightSum1 when not needed.

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This commit is contained in:
Henrik Rydgard 2013-05-19 14:23:17 +02:00
parent b4c01c236b
commit 0ff8be1b1a
1 changed files with 27 additions and 5 deletions
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32
GPU/GLES/VertexShaderGenerator.cpp
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@ -364,9 +364,22 @@ void GenerateVertexShader(int prim, char *buffer) {
if (gstate.isLightingEnabled()) {
WRITE(p, " lowp vec4 lightSum0 = u_ambient * %s + vec4(u_matemissive, 0.0);\n", ambient);
WRITE(p, " lowp vec3 lightSum1 = vec3(0.0);\n");
}
bool lightSum1IsZero = true;
for (int i = 0; i < 4; i++) {
if (doLight[i] != LIGHT_FULL)
continue;
GELightComputation comp = (GELightComputation)(gstate.ltype[i] & 3);
if (comp != GE_LIGHTCOMP_ONLYDIFFUSE) {
lightSum1IsZero = false;
break;
}
}
if (!lightSum1IsZero) {
WRITE(p, " lowp vec3 lightSum1 = vec3(0.0);\n");
}
// Calculate lights if needed. If shade mapping is enabled, lights may need to be
// at least partially calculated.
@ -392,7 +405,7 @@ void GenerateVertexShader(int prim, char *buffer) {
}
char timesLightScale[128];
sprintf(timesLightScale, " * lightScale%i");
sprintf(timesLightScale, " * lightScale%i", i);
// Attenuation
switch (type) {
@ -428,11 +441,20 @@ void GenerateVertexShader(int prim, char *buffer) {
if (gstate.isLightingEnabled()) {
// Sum up ambient, emissive here.
WRITE(p, " v_color0 = clamp(lightSum0, 0.0, 1.0);\n");
if (lmode) {
WRITE(p, " v_color1 = clamp(lightSum1, 0.0, 1.0);\n");
WRITE(p, " v_color0 = clamp(lightSum0, 0.0, 1.0);\n");
// v_color1 only exists when lmode = 1.
if (lightSum1IsZero) {
WRITE(p, " v_color1 = vec3(0.0);\n");
} else {
WRITE(p, " v_color1 = clamp(lightSum1, 0.0, 1.0);\n");
}
} else {
WRITE(p, " v_color0 = clamp(v_color0 + vec4(lightSum1, 0.0), 0.0, 1.0);\n");
if (lightSum1IsZero) {
WRITE(p, " v_color0 = clamp(lightSum0, 0.0, 1.0);\n");
} else {
WRITE(p, " v_color0 = clamp(clamp(lightSum0, 0.0, 1.0) + vec4(lightSum1, 0.0), 0.0, 1.0);\n");
}
}
} else {
// Lighting doesn't affect color.