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Factorize DiffuseIBL and SpecularIBL

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This commit is contained in:
Vincent Lejeune 2014-12-07 19:10:22 +01:00
parent 2e0bec5757
commit a094bbae19
4 changed files with 51 additions and 37 deletions
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41
data/shaders/IBL.frag
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@ -1,57 +1,26 @@
uniform float blueLmn[9];
uniform float greenLmn[9];
uniform float redLmn[9];
uniform sampler2D ntex;
uniform sampler2D dtex;
uniform samplerCube tex;
uniform mat4 TransposeViewMatrix;
out vec4 Diff;
out vec4 Spec;
vec3 DecodeNormal(vec2 n);
vec4 getPosFromUVDepth(vec3 uvDepth, mat4 InverseProjectionMatrix);
mat4 getMatrix(float L[9])
{
float c1 = 0.429043, c2 = 0.511664, c3 = 0.743125, c4 = 0.886227, c5 = 0.247708;
return mat4(
c1 * L[8] /*L22*/, c1 * L[4] /*L2-2*/, c1 * L[7] /*L21*/, c2 * L[3] /*L11*/,
c1 * L[4], - c1 * L[8], c1 * L[5] /*L2-1*/, c2 * L[1] /*L1-1*/,
c1 * L[7], c1 * L[5], c3 * L[6] /*L20*/, c2 * L[2] /*L10*/,
c2 * L[3], c2 * L[1], c2 * L[2], c4 * L[0] /*L00*/ - c5 * L[6]
);
}
vec3 DiffuseIBL(vec3 normal);
vec3 SpecularIBL(vec3 normal, vec3 V, float roughness);
void main(void)
{
vec2 uv = gl_FragCoord.xy / screen;
vec3 normal = normalize(DecodeNormal(2. * texture(ntex, uv).xy - 1.));
// Convert normal in world space (where SH coordinates were computed)
vec4 extendednormal = TransposeViewMatrix * vec4(normal, 0.);
extendednormal.w = 1.;
mat4 rmat = getMatrix(redLmn);
mat4 gmat = getMatrix(greenLmn);
mat4 bmat = getMatrix(blueLmn);
float r = dot(extendednormal, rmat * extendednormal);
float g = dot(extendednormal, gmat * extendednormal);
float b = dot(extendednormal, bmat * extendednormal);
Diff = max(0.25 * vec4(r, g, b, .1), vec4(0.));
Diff = vec4(0.25 * DiffuseIBL(normal), 1.);
float z = texture(dtex, uv).x;
vec4 xpos = getPosFromUVDepth(vec3(uv, z), InverseProjectionMatrix);
vec3 eyedir = -normalize(xpos.xyz);
vec3 sampleDirection = reflect(-eyedir, normal);
sampleDirection = (InverseViewMatrix * vec4(sampleDirection, 0.)).xyz;
float specval = texture(ntex, uv).z;
// Assume 8 level of lod (ie 256x256 texture)
float lodval = 8. * (1. - specval);
vec4 specular = textureLod(tex, sampleDirection, lodval);
Spec = max(specular, vec4(0.));
Spec = vec4(SpecularIBL(normal, eyedir, specval), 1.);
}

32
data/shaders/utils/DiffuseIBL.frag Normal file
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@ -0,0 +1,32 @@
uniform float blueLmn[9];
uniform float greenLmn[9];
uniform float redLmn[9];
uniform mat4 TransposeViewMatrix;
mat4 getMatrix(float L[9])
{
float c1 = 0.429043, c2 = 0.511664, c3 = 0.743125, c4 = 0.886227, c5 = 0.247708;
return mat4(
c1 * L[8] /*L22*/, c1 * L[4] /*L2-2*/, c1 * L[7] /*L21*/, c2 * L[3] /*L11*/,
c1 * L[4], - c1 * L[8], c1 * L[5] /*L2-1*/, c2 * L[1] /*L1-1*/,
c1 * L[7], c1 * L[5], c3 * L[6] /*L20*/, c2 * L[2] /*L10*/,
c2 * L[3], c2 * L[1], c2 * L[2], c4 * L[0] /*L00*/ - c5 * L[6]
);
}
vec3 DiffuseIBL(vec3 normal)
{
// Convert normal in world space (where SH coordinates were computed)
vec4 extendednormal = TransposeViewMatrix * vec4(normal, 0.);
extendednormal.w = 1.;
mat4 rmat = getMatrix(redLmn);
mat4 gmat = getMatrix(greenLmn);
mat4 bmat = getMatrix(blueLmn);
float r = dot(extendednormal, rmat * extendednormal);
float g = dot(extendednormal, gmat * extendednormal);
float b = dot(extendednormal, bmat * extendednormal);
return max(vec3(r, g, b), vec3(0.));
}

11
data/shaders/utils/SpecularIBL.frag Normal file
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@ -0,0 +1,11 @@
uniform samplerCube probe;
vec3 SpecularIBL(vec3 normal, vec3 V, float roughness)
{
vec3 sampleDirection = reflect(-V, normal);
sampleDirection = (InverseViewMatrix * vec4(sampleDirection, 0.)).xyz;
// Assume 8 level of lod (ie 256x256 texture)
float lodval = 8. * (1. - roughness);
return textureLod(probe, sampleDirection, lodval).rgb;
}

4
src/graphics/shaders.cpp
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@ -1649,9 +1649,11 @@ namespace FullScreenShader
GL_VERTEX_SHADER, file_manager->getAsset("shaders/screenquad.vert").c_str(),
GL_FRAGMENT_SHADER, file_manager->getAsset("shaders/utils/decodeNormal.frag").c_str(),
GL_FRAGMENT_SHADER, file_manager->getAsset("shaders/utils/getPosFromUVDepth.frag").c_str(),
GL_FRAGMENT_SHADER, file_manager->getAsset("shaders/utils/DiffuseIBL.frag").c_str(),
GL_FRAGMENT_SHADER, file_manager->getAsset("shaders/utils/SpecularIBL.frag").c_str(),
GL_FRAGMENT_SHADER, file_manager->getAsset("shaders/IBL.frag").c_str());
AssignUniforms("TransposeViewMatrix", "blueLmn[0]", "greenLmn[0]", "redLmn[0]");
AssignSamplerNames(Program, 0, "ntex", 1, "dtex", 2, "tex");
AssignSamplerNames(Program, 0, "ntex", 1, "dtex", 2, "probe");
}
ShadowedSunLightShader::ShadowedSunLightShader()