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Avoid a square root in the point light GPU program by comparing squared lengths. This changes the lighting model a bit since the attenuation calculation is based against these lengths.

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git-svn-id: https://svn.eduke32.com/eduke32@1406 1a8010ca-5511-0410-912e-c29ae57300e0
This commit is contained in:
plagman 2009-06-06 13:48:52 +00:00
parent b112e1d3c3
commit 2186154dac
1 changed files with 3 additions and 8 deletions
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11
polymer/eduke32/build/src/polymer.c
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@ -452,7 +452,6 @@ _prprogrambit prprogrambits[PR_BIT_COUNT] = {
"varying vec3 tangentSpaceLightVector;\n"
"\n",
// frag_prog
" vec2 lightRange;\n"
" float pointLightDistance;\n"
" float lightAttenuation;\n"
" float spotAttenuation;\n"
@ -464,11 +463,8 @@ _prprogrambit prprogrambits[PR_BIT_COUNT] = {
"\n"
" L = normalize(lightVector);\n"
"\n"
" pointLightDistance = length(lightVector);\n"
" lightRange.x = gl_LightSource[0].constantAttenuation;\n"
" lightRange.y = gl_LightSource[0].linearAttenuation;\n"
"\n"
" lightAttenuation = clamp(1.0 - pointLightDistance * lightRange.y, 0.0, 1.0);\n"
" pointLightDistance = dot(lightVector,lightVector);\n"
" lightAttenuation = clamp(1.0 - pointLightDistance * gl_LightSource[0].linearAttenuation, 0.0, 1.0);\n"
" spotAttenuation = 1.0;\n"
"\n"
" if (isSpotLight == 1) {\n"
@ -3954,7 +3950,7 @@ static int32_t polymer_bindmaterial(_prmaterial material, int16_t* lights,
}
range[0] = prlights[lights[curlight]].range / 1000.0f;
range[1] = 1 / range[0];
range[1] = 1 / (range[0] * range[0]);
color[0] = prlights[lights[curlight]].color[0] / 255.0f;
color[1] = prlights[lights[curlight]].color[1] / 255.0f;
@ -3963,7 +3959,6 @@ static int32_t polymer_bindmaterial(_prmaterial material, int16_t* lights,
bglLightfv(GL_LIGHT0, GL_AMBIENT, pos);
bglLightfv(GL_LIGHT0, GL_DIFFUSE, color);
bglLightfv(GL_LIGHT0, GL_SPECULAR, inpos);
bglLightfv(GL_LIGHT0, GL_CONSTANT_ATTENUATION, &range[0]);
bglLightfv(GL_LIGHT0, GL_LINEAR_ATTENUATION, &range[1]);
}