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#version 330 core
out vec4 FragColor;
in vec2 TexCoords;
uniform sampler2D shadowmapTexture;
uniform sampler2D irradianceTexture;
uniform int screenWidth;
uniform int screenHeight;
uniform int renderState;
uniform vec2 samplePositions[13];
uniform vec3 sampleWeights[13];
void main()
{
if (renderState == 0) {
FragColor = texture(shadowmapTexture, TexCoords);
}
// stencil buffer
else if (renderState == 1 || texture(irradianceTexture, TexCoords).rgb == vec3(0, 0, 0)) {
FragColor = texture(irradianceTexture, TexCoords);
}
else if (renderState == 2) {
FragColor = texture(shadowmapTexture, TexCoords) * texture(irradianceTexture, TexCoords);
}
else if (renderState == 3) {
vec4 result = vec4(0, 0, 0, 1);
for (int i = 0; i < 13; i++) {
float oneX = 1.0/screenWidth;
float oneY = 1.0/screenHeight;
vec4 sample = texture(irradianceTexture, TexCoords + samplePositions[i] * vec2(oneX, oneY));
vec4 weight = vec4(sampleWeights[i], 1);
result += sample * weight;
}
FragColor = result;
}
}
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