diff options
Diffstat (limited to 'source/blender/draw/engines/eevee/shaders/shadow_store_frag.glsl')
| -rw-r--r-- | source/blender/draw/engines/eevee/shaders/shadow_store_frag.glsl | 245 |
1 files changed, 245 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/shadow_store_frag.glsl b/source/blender/draw/engines/eevee/shaders/shadow_store_frag.glsl new file mode 100644 index 00000000000..d5ac821c3fa --- /dev/null +++ b/source/blender/draw/engines/eevee/shaders/shadow_store_frag.glsl @@ -0,0 +1,245 @@ + +layout(std140) uniform shadow_render_block { + vec4 lampPosition; + float cubeTexelSize; + float storedTexelSize; + float nearClip; + float farClip; + int shadowSampleCount; + float shadowInvSampleCount; +}; + +#ifdef CSM +uniform sampler2DArray shadowTexture; +uniform int cascadeId; +#else +uniform samplerCube shadowTexture; +#endif +uniform float shadowFilterSize; + +out vec4 FragColor; + +vec3 octahedral_to_cubemap_proj(vec2 co) +{ + co = co * 2.0 - 1.0; + + 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); + } + + return v; +} + +/* Marco Salvi's GDC 2008 presentation about shadow maps pre-filtering techniques slide 24 */ +float ln_space_prefilter(float w0, float x, float w1, float y) +{ + return x + log(w0 + w1 * exp(y - x)); +} + +vec4 ln_space_prefilter(float w0, vec4 x, float w1, vec4 y) +{ + return x + log(w0 + w1 * exp(y - x)); +} + +#ifdef CSM +vec3 get_texco(vec3 cos, const vec2 ofs) +{ + cos.xy += ofs * shadowFilterSize; + return cos; +} +#else /* CUBEMAP */ +/* global vars */ +vec3 T = vec3(0.0); +vec3 B = vec3(0.0); + +void make_orthonormal_basis(vec3 N) +{ + vec3 UpVector = (abs(N.z) < 0.999) ? vec3(0.0, 0.0, 1.0) : vec3(1.0, 0.0, 0.0); + T = normalize(cross(UpVector, N)); + B = cross(N, T); +} + +vec3 get_texco(vec3 cos, const vec2 ofs) +{ + return cos + ofs.x * T + ofs.y * B; +} + +#endif + +#ifdef ESM +void grouped_samples_accum( + vec3 cos, + const vec2 co1, const vec2 co2, const vec2 co3, const vec2 co4, + inout vec4 accum) +{ + vec4 depths; + depths.x = texture(shadowTexture, get_texco(cos, co1)).r; + depths.y = texture(shadowTexture, get_texco(cos, co2)).r; + depths.z = texture(shadowTexture, get_texco(cos, co3)).r; + depths.w = texture(shadowTexture, get_texco(cos, co4)).r; + + accum = ln_space_prefilter(1.0, accum, shadowInvSampleCount, depths); +} +#else /* VSM */ +void grouped_samples_accum( + vec3 cos, + const vec2 co1, const vec2 co2, const vec2 co3, const vec2 co4, + inout vec2 accum) +{ + vec4 depths1, depths2; + depths1.xy = texture(shadowTexture, get_texco(cos, co1)).rg; + depths1.zw = texture(shadowTexture, get_texco(cos, co2)).rg; + depths2.xy = texture(shadowTexture, get_texco(cos, co3)).rg; + depths2.zw = texture(shadowTexture, get_texco(cos, co4)).rg; + + accum += depths1.xy + depths1.zw + depths2.xy + depths2.zw; +} +#endif + +void main() { + vec3 cos; + + cos.xy = gl_FragCoord.xy * storedTexelSize; + +#ifdef CSM + cos.z = float(cascadeId); +#else /* CUBEMAP */ + /* add a 2 pixel border to ensure filtering is correct */ + cos.xy *= 1.0 + storedTexelSize * 2.0; + cos.xy -= storedTexelSize; + + float pattern = 1.0; + + /* edge mirroring : only mirror if directly adjacent + * (not diagonally adjacent) */ + vec2 m = abs(cos.xy - 0.5) + 0.5; + vec2 f = floor(m); + if (f.x - f.y != 0.0) { + cos.xy = 1.0 - cos.xy; + } + + /* clamp to [0-1] */ + cos.xy = fract(cos.xy); + + /* get cubemap vector */ + cos = normalize(octahedral_to_cubemap_proj(cos.xy)); + make_orthonormal_basis(cos); + + T *= shadowFilterSize; + B *= shadowFilterSize; +#endif + +#ifdef ESM + /* disc blur in log space. */ + vec4 accum = vec4(0.0); + vec4 depths; + depths.x = texture(shadowTexture, get_texco(cos, concentric[0])).r; + depths.y = texture(shadowTexture, get_texco(cos, concentric[1])).r; + depths.z = texture(shadowTexture, get_texco(cos, concentric[2])).r; + depths.w = texture(shadowTexture, get_texco(cos, concentric[3])).r; + accum = ln_space_prefilter(0.0, accum, shadowInvSampleCount, depths); + +#else /* VSM */ + vec2 accum = vec2(0.0); + grouped_samples_accum(cos, concentric[0], concentric[1], concentric[2], concentric[3], accum); +#endif + + /** + * Making the `grouped_samples_accum` be called within a loop would be + * the most conventional solution, however in some older gpus, transverse the huge + * `const vec2 concentric[]` array with variable indices is extremely slow. + * The solution is to use constant indices to access the array. + */ + if (shadowSampleCount > 4) { + grouped_samples_accum(cos, concentric[4], concentric[5], concentric[6], concentric[7], accum); + grouped_samples_accum(cos, concentric[8], concentric[9], concentric[10], concentric[11], accum); + grouped_samples_accum(cos, concentric[12], concentric[13], concentric[14], concentric[15], accum); + } + if (shadowSampleCount > 16) { + grouped_samples_accum(cos, concentric[16], concentric[17], concentric[18], concentric[19], accum); + grouped_samples_accum(cos, concentric[20], concentric[21], concentric[22], concentric[23], accum); + grouped_samples_accum(cos, concentric[24], concentric[25], concentric[26], concentric[27], accum); + grouped_samples_accum(cos, concentric[28], concentric[29], concentric[30], concentric[31], accum); + grouped_samples_accum(cos, concentric[32], concentric[33], concentric[34], concentric[35], accum); + } +#ifdef HIGH_BLUR + if (shadowSampleCount > 36) { + grouped_samples_accum(cos, concentric[36], concentric[37], concentric[38], concentric[39], accum); + grouped_samples_accum(cos, concentric[40], concentric[41], concentric[42], concentric[43], accum); + grouped_samples_accum(cos, concentric[44], concentric[45], concentric[46], concentric[47], accum); + grouped_samples_accum(cos, concentric[48], concentric[49], concentric[50], concentric[51], accum); + grouped_samples_accum(cos, concentric[52], concentric[53], concentric[54], concentric[55], accum); + grouped_samples_accum(cos, concentric[56], concentric[57], concentric[58], concentric[59], accum); + grouped_samples_accum(cos, concentric[60], concentric[61], concentric[62], concentric[63], accum); + } + if (shadowSampleCount > 64) { + grouped_samples_accum(cos, concentric[64], concentric[65], concentric[66], concentric[67], accum); + grouped_samples_accum(cos, concentric[68], concentric[69], concentric[70], concentric[71], accum); + grouped_samples_accum(cos, concentric[72], concentric[73], concentric[74], concentric[75], accum); + grouped_samples_accum(cos, concentric[76], concentric[77], concentric[78], concentric[79], accum); + grouped_samples_accum(cos, concentric[80], concentric[81], concentric[82], concentric[83], accum); + grouped_samples_accum(cos, concentric[84], concentric[85], concentric[86], concentric[87], accum); + grouped_samples_accum(cos, concentric[88], concentric[89], concentric[90], concentric[91], accum); + grouped_samples_accum(cos, concentric[92], concentric[93], concentric[94], concentric[95], accum); + grouped_samples_accum(cos, concentric[96], concentric[97], concentric[98], concentric[99], accum); + } + if (shadowSampleCount > 100) { + grouped_samples_accum(cos, concentric[100], concentric[101], concentric[102], concentric[103], accum); + grouped_samples_accum(cos, concentric[104], concentric[105], concentric[106], concentric[107], accum); + grouped_samples_accum(cos, concentric[108], concentric[109], concentric[110], concentric[111], accum); + grouped_samples_accum(cos, concentric[112], concentric[113], concentric[114], concentric[115], accum); + grouped_samples_accum(cos, concentric[116], concentric[117], concentric[118], concentric[119], accum); + grouped_samples_accum(cos, concentric[120], concentric[121], concentric[122], concentric[123], accum); + grouped_samples_accum(cos, concentric[124], concentric[125], concentric[126], concentric[127], accum); + grouped_samples_accum(cos, concentric[128], concentric[129], concentric[130], concentric[131], accum); + grouped_samples_accum(cos, concentric[132], concentric[133], concentric[134], concentric[135], accum); + grouped_samples_accum(cos, concentric[136], concentric[137], concentric[138], concentric[139], accum); + grouped_samples_accum(cos, concentric[140], concentric[141], concentric[142], concentric[143], accum); + } + if (shadowSampleCount > 144) { + grouped_samples_accum(cos, concentric[144], concentric[145], concentric[146], concentric[147], accum); + grouped_samples_accum(cos, concentric[148], concentric[149], concentric[150], concentric[151], accum); + grouped_samples_accum(cos, concentric[152], concentric[153], concentric[154], concentric[155], accum); + grouped_samples_accum(cos, concentric[156], concentric[157], concentric[158], concentric[159], accum); + grouped_samples_accum(cos, concentric[160], concentric[161], concentric[162], concentric[163], accum); + grouped_samples_accum(cos, concentric[164], concentric[165], concentric[166], concentric[167], accum); + grouped_samples_accum(cos, concentric[168], concentric[169], concentric[170], concentric[171], accum); + grouped_samples_accum(cos, concentric[172], concentric[173], concentric[174], concentric[175], accum); + grouped_samples_accum(cos, concentric[176], concentric[177], concentric[178], concentric[179], accum); + grouped_samples_accum(cos, concentric[180], concentric[181], concentric[182], concentric[183], accum); + grouped_samples_accum(cos, concentric[184], concentric[185], concentric[186], concentric[187], accum); + grouped_samples_accum(cos, concentric[188], concentric[189], concentric[190], concentric[191], accum); + grouped_samples_accum(cos, concentric[192], concentric[193], concentric[194], concentric[195], accum); + } + if (shadowSampleCount > 196) { + grouped_samples_accum(cos, concentric[196], concentric[197], concentric[198], concentric[199], accum); + grouped_samples_accum(cos, concentric[200], concentric[201], concentric[202], concentric[203], accum); + grouped_samples_accum(cos, concentric[204], concentric[205], concentric[206], concentric[207], accum); + grouped_samples_accum(cos, concentric[208], concentric[209], concentric[210], concentric[211], accum); + grouped_samples_accum(cos, concentric[212], concentric[213], concentric[114], concentric[215], accum); + grouped_samples_accum(cos, concentric[216], concentric[217], concentric[218], concentric[219], accum); + grouped_samples_accum(cos, concentric[220], concentric[221], concentric[222], concentric[223], accum); + grouped_samples_accum(cos, concentric[224], concentric[225], concentric[226], concentric[227], accum); + grouped_samples_accum(cos, concentric[228], concentric[229], concentric[230], concentric[231], accum); + grouped_samples_accum(cos, concentric[232], concentric[233], concentric[234], concentric[235], accum); + grouped_samples_accum(cos, concentric[236], concentric[237], concentric[238], concentric[239], accum); + grouped_samples_accum(cos, concentric[240], concentric[241], concentric[242], concentric[243], accum); + grouped_samples_accum(cos, concentric[244], concentric[245], concentric[246], concentric[247], accum); + grouped_samples_accum(cos, concentric[248], concentric[249], concentric[250], concentric[251], accum); + grouped_samples_accum(cos, concentric[252], concentric[253], concentric[254], concentric[255], accum); + } +#endif + +#ifdef ESM + accum.x = ln_space_prefilter(1.0, accum.x, 1.0, accum.y); + accum.x = ln_space_prefilter(1.0, accum.x, 1.0, accum.z); + accum.x = ln_space_prefilter(1.0, accum.x, 1.0, accum.w); + FragColor = accum.xxxx; + +#else /* VSM */ + FragColor = accum.xyxy * shadowInvSampleCount; +#endif +} |