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path: root/source/blender/draw/engines/eevee/shaders/lightprobe_filter_diffuse_frag.glsl
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Diffstat (limited to 'source/blender/draw/engines/eevee/shaders/lightprobe_filter_diffuse_frag.glsl')
-rw-r--r--source/blender/draw/engines/eevee/shaders/lightprobe_filter_diffuse_frag.glsl301
1 files changed, 145 insertions, 156 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/lightprobe_filter_diffuse_frag.glsl b/source/blender/draw/engines/eevee/shaders/lightprobe_filter_diffuse_frag.glsl
index 7cf4259a938..37b02a2130f 100644
--- a/source/blender/draw/engines/eevee/shaders/lightprobe_filter_diffuse_frag.glsl
+++ b/source/blender/draw/engines/eevee/shaders/lightprobe_filter_diffuse_frag.glsl
@@ -12,186 +12,175 @@ out vec4 FragColor;
#define M_4PI 12.5663706143591729
const mat3 CUBE_ROTATIONS[6] = mat3[](
- mat3(vec3( 0.0, 0.0, -1.0),
- vec3( 0.0, -1.0, 0.0),
- vec3(-1.0, 0.0, 0.0)),
- mat3(vec3( 0.0, 0.0, 1.0),
- vec3( 0.0, -1.0, 0.0),
- vec3( 1.0, 0.0, 0.0)),
- mat3(vec3( 1.0, 0.0, 0.0),
- vec3( 0.0, 0.0, 1.0),
- vec3( 0.0, -1.0, 0.0)),
- mat3(vec3( 1.0, 0.0, 0.0),
- vec3( 0.0, 0.0, -1.0),
- vec3( 0.0, 1.0, 0.0)),
- mat3(vec3( 1.0, 0.0, 0.0),
- vec3( 0.0, -1.0, 0.0),
- vec3( 0.0, 0.0, -1.0)),
- mat3(vec3(-1.0, 0.0, 0.0),
- vec3( 0.0, -1.0, 0.0),
- vec3( 0.0, 0.0, 1.0)));
+ mat3(vec3(0.0, 0.0, -1.0), vec3(0.0, -1.0, 0.0), vec3(-1.0, 0.0, 0.0)),
+ mat3(vec3(0.0, 0.0, 1.0), vec3(0.0, -1.0, 0.0), vec3(1.0, 0.0, 0.0)),
+ mat3(vec3(1.0, 0.0, 0.0), vec3(0.0, 0.0, 1.0), vec3(0.0, -1.0, 0.0)),
+ mat3(vec3(1.0, 0.0, 0.0), vec3(0.0, 0.0, -1.0), vec3(0.0, 1.0, 0.0)),
+ mat3(vec3(1.0, 0.0, 0.0), vec3(0.0, -1.0, 0.0), vec3(0.0, 0.0, -1.0)),
+ mat3(vec3(-1.0, 0.0, 0.0), vec3(0.0, -1.0, 0.0), vec3(0.0, 0.0, 1.0)));
vec3 get_cubemap_vector(vec2 co, int face)
{
- return normalize(CUBE_ROTATIONS[face] * vec3(co * 2.0 - 1.0, 1.0));
+ return normalize(CUBE_ROTATIONS[face] * vec3(co * 2.0 - 1.0, 1.0));
}
float area_element(float x, float y)
{
- return atan(x * y, sqrt(x * x + y * y + 1));
+ return atan(x * y, sqrt(x * x + y * y + 1));
}
float texel_solid_angle(vec2 co, float halfpix)
{
- vec2 v1 = (co - vec2(halfpix)) * 2.0 - 1.0;
- vec2 v2 = (co + vec2(halfpix)) * 2.0 - 1.0;
+ vec2 v1 = (co - vec2(halfpix)) * 2.0 - 1.0;
+ vec2 v2 = (co + vec2(halfpix)) * 2.0 - 1.0;
- return area_element(v1.x, v1.y) - area_element(v1.x, v2.y) - area_element(v2.x, v1.y) + area_element(v2.x, v2.y);
+ return area_element(v1.x, v1.y) - area_element(v1.x, v2.y) - area_element(v2.x, v1.y) +
+ area_element(v2.x, v2.y);
}
vec3 octahedral_to_cubemap_proj(vec2 co)
{
- co = co * 2.0 - 1.0;
+ co = co * 2.0 - 1.0;
- vec2 abs_co = abs(co);
- vec3 v = vec3(co, 1.0 - (abs_co.x + abs_co.y));
+ vec2 abs_co = abs(co);
+ vec3 v = vec3(co, 1.0 - (abs_co.x + abs_co.y));
- if ( abs_co.x + abs_co.y > 1.0 ) {
- v.xy = (abs(co.yx) - 1.0) * -sign(co.xy);
- }
+ if (abs_co.x + abs_co.y > 1.0) {
+ v.xy = (abs(co.yx) - 1.0) * -sign(co.xy);
+ }
- return v;
+ return v;
}
void main()
{
#if defined(IRRADIANCE_SH_L2)
- float pixstep = 1.0 / probeSize;
- float halfpix = pixstep / 2.0;
-
- /* Downside: leaks negative values, very bandwidth consuming */
- int comp = int(gl_FragCoord.x) % 3 + (int(gl_FragCoord.y) % 3) * 3;
-
- float weight_accum = 0.0;
- vec3 sh = vec3(0.0);
-
- for (int face = 0; face < 6; ++face) {
- for (float x = halfpix; x < 1.0; x += pixstep) {
- for (float y = halfpix; y < 1.0; y += pixstep) {
- float weight, coef;
- vec2 facecoord = vec2(x,y);
- vec3 cubevec = get_cubemap_vector(facecoord, face);
-
- if (comp == 0) {
- coef = 0.282095;
- }
- else if (comp == 1) {
- coef = -0.488603 * cubevec.z * 2.0 / 3.0;
- }
- else if (comp == 2) {
- coef = 0.488603 * cubevec.y * 2.0 / 3.0;
- }
- else if (comp == 3) {
- coef = -0.488603 * cubevec.x * 2.0 / 3.0;
- }
- else if (comp == 4) {
- coef = 1.092548 * cubevec.x * cubevec.z * 1.0 / 4.0;
- }
- else if (comp == 5) {
- coef = -1.092548 * cubevec.z * cubevec.y * 1.0 / 4.0;
- }
- else if (comp == 6) {
- coef = 0.315392 * (3.0 * cubevec.y * cubevec.y - 1.0) * 1.0 / 4.0;
- }
- else if (comp == 7) {
- coef = 1.092548 * cubevec.x * cubevec.y * 1.0 / 4.0;
- }
- else { /* (comp == 8) */
- coef = 0.546274 * (cubevec.x * cubevec.x - cubevec.z * cubevec.z) * 1.0 / 4.0;
- }
-
- weight = texel_solid_angle(facecoord, halfpix);
-
- vec4 sample = textureLod(probeHdr, cubevec, lodMax);
- sh += sample.rgb * coef * weight;
- weight_accum += weight;
- }
- }
- }
- sh *= M_4PI / weight_accum;
-
- FragColor = vec4(sh, 1.0);
+ float pixstep = 1.0 / probeSize;
+ float halfpix = pixstep / 2.0;
+
+ /* Downside: leaks negative values, very bandwidth consuming */
+ int comp = int(gl_FragCoord.x) % 3 + (int(gl_FragCoord.y) % 3) * 3;
+
+ float weight_accum = 0.0;
+ vec3 sh = vec3(0.0);
+
+ for (int face = 0; face < 6; ++face) {
+ for (float x = halfpix; x < 1.0; x += pixstep) {
+ for (float y = halfpix; y < 1.0; y += pixstep) {
+ float weight, coef;
+ vec2 facecoord = vec2(x, y);
+ vec3 cubevec = get_cubemap_vector(facecoord, face);
+
+ if (comp == 0) {
+ coef = 0.282095;
+ }
+ else if (comp == 1) {
+ coef = -0.488603 * cubevec.z * 2.0 / 3.0;
+ }
+ else if (comp == 2) {
+ coef = 0.488603 * cubevec.y * 2.0 / 3.0;
+ }
+ else if (comp == 3) {
+ coef = -0.488603 * cubevec.x * 2.0 / 3.0;
+ }
+ else if (comp == 4) {
+ coef = 1.092548 * cubevec.x * cubevec.z * 1.0 / 4.0;
+ }
+ else if (comp == 5) {
+ coef = -1.092548 * cubevec.z * cubevec.y * 1.0 / 4.0;
+ }
+ else if (comp == 6) {
+ coef = 0.315392 * (3.0 * cubevec.y * cubevec.y - 1.0) * 1.0 / 4.0;
+ }
+ else if (comp == 7) {
+ coef = 1.092548 * cubevec.x * cubevec.y * 1.0 / 4.0;
+ }
+ else { /* (comp == 8) */
+ coef = 0.546274 * (cubevec.x * cubevec.x - cubevec.z * cubevec.z) * 1.0 / 4.0;
+ }
+
+ weight = texel_solid_angle(facecoord, halfpix);
+
+ vec4 sample = textureLod(probeHdr, cubevec, lodMax);
+ sh += sample.rgb * coef * weight;
+ weight_accum += weight;
+ }
+ }
+ }
+ sh *= M_4PI / weight_accum;
+
+ FragColor = vec4(sh, 1.0);
#else
-#if defined(IRRADIANCE_CUBEMAP)
- /* Downside: Need lots of memory for storage, distortion due to octahedral mapping */
- const vec2 map_size = vec2(16.0);
- const vec2 texelSize = 1.0 / map_size;
- vec2 uvs = mod(gl_FragCoord.xy, map_size) * texelSize;
- const float paddingSize = 1.0;
-
- /* Add a N pixel border to ensure filtering is correct
- * for N mipmap levels. */
- uvs = (uvs - texelSize * paddingSize) / (1.0 - 2.0 * texelSize * paddingSize);
-
- /* edge mirroring : only mirror if directly adjacent
- * (not diagonally adjacent) */
- vec2 m = abs(uvs - 0.5) + 0.5;
- vec2 f = floor(m);
- if (f.x - f.y != 0.0) {
- uvs = 1.0 - uvs;
- }
-
- /* clamp to [0-1] */
- uvs = fract(uvs);
-
- /* get cubemap vector */
- vec3 cubevec = octahedral_to_cubemap_proj(uvs);
-
-#elif defined(IRRADIANCE_HL2)
- /* Downside: very very low resolution (6 texels), bleed lighting because of interpolation */
- int x = int(gl_FragCoord.x) % 3;
- int y = int(gl_FragCoord.y) % 2;
-
- vec3 cubevec = vec3(1.0, 0.0, 0.0);
-
- if (x == 1) {
- cubevec = cubevec.yxy;
- }
- else if (x == 2) {
- cubevec = cubevec.yyx;
- }
-
- if (y == 1) {
- cubevec = -cubevec;
- }
-#endif
-
- vec3 N, T, B, V;
-
- N = normalize(cubevec);
-
- make_orthonormal_basis(N, T, B); /* Generate tangent space */
-
- /* Integrating Envmap */
- float weight = 0.0;
- vec3 out_radiance = vec3(0.0);
- for (float i = 0; i < sampleCount; i++) {
- vec3 L = sample_hemisphere(i, N, T, B); /* Microfacet normal */
- float NL = dot(N, L);
-
- if (NL > 0.0) {
- /* Coarse Approximation of the mapping distortion
- * Unit Sphere -> Cubemap Face */
- const float dist = 4.0 * M_PI / 6.0;
- float pdf = pdf_hemisphere();
- /* http://http.developer.nvidia.com/GPUGems3/gpugems3_ch20.html : Equation 13 */
- float lod = clamp(lodFactor - 0.5 * log2(pdf * dist), 0.0, lodMax) ;
-
- out_radiance += textureLod(probeHdr, L, lod).rgb * NL;
- weight += NL;
- }
- }
-
- FragColor = irradiance_encode(intensityFac * out_radiance / weight);
+# if defined(IRRADIANCE_CUBEMAP)
+ /* Downside: Need lots of memory for storage, distortion due to octahedral mapping */
+ const vec2 map_size = vec2(16.0);
+ const vec2 texelSize = 1.0 / map_size;
+ vec2 uvs = mod(gl_FragCoord.xy, map_size) * texelSize;
+ const float paddingSize = 1.0;
+
+ /* Add a N pixel border to ensure filtering is correct
+ * for N mipmap levels. */
+ uvs = (uvs - texelSize * paddingSize) / (1.0 - 2.0 * texelSize * paddingSize);
+
+ /* edge mirroring : only mirror if directly adjacent
+ * (not diagonally adjacent) */
+ vec2 m = abs(uvs - 0.5) + 0.5;
+ vec2 f = floor(m);
+ if (f.x - f.y != 0.0) {
+ uvs = 1.0 - uvs;
+ }
+
+ /* clamp to [0-1] */
+ uvs = fract(uvs);
+
+ /* get cubemap vector */
+ vec3 cubevec = octahedral_to_cubemap_proj(uvs);
+
+# elif defined(IRRADIANCE_HL2)
+ /* Downside: very very low resolution (6 texels), bleed lighting because of interpolation */
+ int x = int(gl_FragCoord.x) % 3;
+ int y = int(gl_FragCoord.y) % 2;
+
+ vec3 cubevec = vec3(1.0, 0.0, 0.0);
+
+ if (x == 1) {
+ cubevec = cubevec.yxy;
+ }
+ else if (x == 2) {
+ cubevec = cubevec.yyx;
+ }
+
+ if (y == 1) {
+ cubevec = -cubevec;
+ }
+# endif
+
+ vec3 N, T, B, V;
+
+ N = normalize(cubevec);
+
+ make_orthonormal_basis(N, T, B); /* Generate tangent space */
+
+ /* Integrating Envmap */
+ float weight = 0.0;
+ vec3 out_radiance = vec3(0.0);
+ for (float i = 0; i < sampleCount; i++) {
+ vec3 L = sample_hemisphere(i, N, T, B); /* Microfacet normal */
+ float NL = dot(N, L);
+
+ if (NL > 0.0) {
+ /* Coarse Approximation of the mapping distortion
+ * Unit Sphere -> Cubemap Face */
+ const float dist = 4.0 * M_PI / 6.0;
+ float pdf = pdf_hemisphere();
+ /* http://http.developer.nvidia.com/GPUGems3/gpugems3_ch20.html : Equation 13 */
+ float lod = clamp(lodFactor - 0.5 * log2(pdf * dist), 0.0, lodMax);
+
+ out_radiance += textureLod(probeHdr, L, lod).rgb * NL;
+ weight += NL;
+ }
+ }
+
+ FragColor = irradiance_encode(intensityFac * out_radiance / weight);
#endif
}
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