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Shader simplification: Share some variables between lights to help bad register allocators

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This commit is contained in:
Henrik Rydgard 2013-05-19 14:36:07 +02:00
parent 0ff8be1b1a
commit a1d549c59f
1 changed files with 25 additions and 15 deletions
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40
GPU/GLES/VertexShaderGenerator.cpp
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@ -366,21 +366,30 @@ void GenerateVertexShader(int prim, char *buffer) {
WRITE(p, " lowp vec4 lightSum0 = u_ambient * %s + vec4(u_matemissive, 0.0);\n", ambient);
}
bool lightSum1IsZero = true;
bool diffuseIsZero = true;
bool specularIsZero = true;
bool distanceNeeded = false;
for (int i = 0; i < 4; i++) {
if (doLight[i] != LIGHT_FULL)
continue;
diffuseIsZero = false;
GELightComputation comp = (GELightComputation)(gstate.ltype[i] & 3);
if (comp != GE_LIGHTCOMP_ONLYDIFFUSE) {
lightSum1IsZero = false;
break;
}
if (comp != GE_LIGHTCOMP_ONLYDIFFUSE)
specularIsZero = false;
GELightType type = (GELightType)((gstate.ltype[i] >> 8) & 3);
if (type != GE_LIGHTTYPE_DIRECTIONAL)
distanceNeeded = true;
}
if (!lightSum1IsZero) {
if (!specularIsZero) {
WRITE(p, " lowp vec3 lightSum1 = vec3(0.0);\n");
}
if (distanceNeeded) {
WRITE(p, " float distance;\n");
WRITE(p, " lowp float lightScale;\n");
}
// Calculate lights if needed. If shade mapping is enabled, lights may need to be
// at least partially calculated.
for (int i = 0; i < 4; i++) {
@ -405,7 +414,7 @@ void GenerateVertexShader(int prim, char *buffer) {
}
char timesLightScale[128];
sprintf(timesLightScale, " * lightScale%i", i);
sprintf(timesLightScale, " * lightScale");
// Attenuation
switch (type) {
@ -413,16 +422,17 @@ void GenerateVertexShader(int prim, char *buffer) {
timesLightScale[0] = 0;
break;
case GE_LIGHTTYPE_POINT:
WRITE(p, " float distance%i = length(toLight%i);\n", i, i);
WRITE(p, " lowp float lightScale%i = clamp(1.0 / dot(u_lightatt%i, vec3(1.0, distance%i, distance%i*distance%i)), 0.0, 1.0);\n", i, i, i, i, i);
WRITE(p, " distance = length(toLight%i);\n", i, i);
WRITE(p, " lightScale = clamp(1.0 / dot(u_lightatt%i, vec3(1.0, distance, distance*distance)), 0.0, 1.0);\n", i);
break;
case GE_LIGHTTYPE_SPOT:
WRITE(p, " float distance%i = length(toLight%i);\n", i, i);
WRITE(p, " lowp float lightScale%i = 0.0;\n", i);
WRITE(p, " distance = length(toLight%i);\n", i, i);
WRITE(p, " lowp float angle%i = dot(normalize(u_lightdir%i), normalize(toLight%i));\n", i, i, i);
WRITE(p, " if (angle%i >= u_lightangle%i) {\n", i, i);
WRITE(p, " lightScale%i = clamp(1.0 / dot(u_lightatt%i, vec3(1.0, distance%i, distance%i*distance%i)), 0.0, 1.0) * pow(angle%i, u_lightspotCoef%i);\n", i, i, i, i, i, i, i);
WRITE(p, " }\n");
WRITE(p, " lightScale = clamp(1.0 / dot(u_lightatt%i, vec3(1.0, distance, distance*distance)), 0.0, 1.0) * pow(angle%i, u_lightspotCoef%i);\n", i, i, i);
WRITE(p, " } else {\n");
WRITE(p, " lightScale = 0.0;\n");
WRITE(p, " }\n");
break;
default:
// ILLEGAL
@ -444,13 +454,13 @@ void GenerateVertexShader(int prim, char *buffer) {
if (lmode) {
WRITE(p, " v_color0 = clamp(lightSum0, 0.0, 1.0);\n");
// v_color1 only exists when lmode = 1.
if (lightSum1IsZero) {
if (specularIsZero) {
WRITE(p, " v_color1 = vec3(0.0);\n");
} else {
WRITE(p, " v_color1 = clamp(lightSum1, 0.0, 1.0);\n");
}
} else {
if (lightSum1IsZero) {
if (specularIsZero) {
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");