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#pragma BLENDER_REQUIRE(common_math_lib.glsl)
#pragma BLENDER_REQUIRE(common_utiltex_lib.glsl)
#pragma BLENDER_REQUIRE(lights_lib.glsl)
uniform sampler2D depthBuffer;
out vec4 fragColor;
void main()
{
if (laNumLight == 0) {
/* Early exit: No lights in scene */
fragColor.r = 1.0;
return;
}
ivec2 texel = ivec2(gl_FragCoord.xy);
float depth = texelFetch(depthBuffer, texel, 0).r;
if (depth == 1.0f) {
/* Early exit background does not receive shadows */
fragColor.r = 1.0;
return;
}
vec2 texel_size = 1.0 / vec2(textureSize(depthBuffer, 0)).xy;
vec2 uvs = saturate(gl_FragCoord.xy * texel_size);
vec4 rand = texelfetch_noise_tex(texel);
float accum_light = 0.0;
float tracing_depth = depth;
/* Constant bias (due to depth buffer precision) */
/* Magic numbers for 24bits of precision.
* From http://terathon.com/gdc07_lengyel.pdf (slide 26) */
tracing_depth -= mix(2.4e-7, 4.8e-7, depth);
/* Convert to view Z. */
tracing_depth = get_view_z_from_depth(tracing_depth);
vec3 vP = get_view_space_from_depth(uvs, depth);
vec3 P = transform_point(ViewMatrixInverse, vP);
vec3 vNg = safe_normalize(cross(dFdx(vP), dFdy(vP)));
for (int i = 0; i < MAX_LIGHT && i < laNumLight; i++) {
LightData ld = lights_data[i];
vec4 l_vector; /* Non-Normalized Light Vector with length in last component. */
l_vector.xyz = ld.l_position - P;
l_vector.w = length(l_vector.xyz);
float l_vis = light_shadowing(ld, P, 1.0);
l_vis *= light_contact_shadows(ld, P, vP, tracing_depth, vNg, rand.x, 1.0);
accum_light += l_vis;
}
fragColor.r = accum_light / float(laNumLight);
}
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