295 lines
7 KiB
GLSL
295 lines
7 KiB
GLSL
[vertex]
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layout(location=0) in highp vec2 vertex;
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layout(location=4) in highp vec2 uv;
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out highp vec2 uv_interp;
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void main() {
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uv_interp=uv;
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gl_Position=vec4(vertex,0,1);
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}
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[fragment]
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precision highp float;
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precision highp int;
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#ifdef USE_SOURCE_PANORAMA
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uniform sampler2D source_panorama; //texunit:0
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#endif
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#ifdef USE_SOURCE_DUAL_PARABOLOID_ARRAY
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uniform sampler2DArray source_dual_paraboloid_array; //texunit:0
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uniform int source_array_index;
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#endif
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#if !defined(USE_SOURCE_DUAL_PARABOLOID_ARRAY) && !defined(USE_SOURCE_PANORAMA)
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uniform samplerCube source_cube; //texunit:0
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#endif
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uniform int face_id;
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uniform float roughness;
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in highp vec2 uv_interp;
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layout(location = 0) out vec4 frag_color;
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#define M_PI 3.14159265359
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vec3 texelCoordToVec(vec2 uv, int faceID)
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{
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mat3 faceUvVectors[6];
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/*
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// -x
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faceUvVectors[1][0] = vec3(0.0, 0.0, 1.0); // u -> +z
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faceUvVectors[1][1] = vec3(0.0, -1.0, 0.0); // v -> -y
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faceUvVectors[1][2] = vec3(-1.0, 0.0, 0.0); // -x face
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// +x
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faceUvVectors[0][0] = vec3(0.0, 0.0, -1.0); // u -> -z
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faceUvVectors[0][1] = vec3(0.0, -1.0, 0.0); // v -> -y
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faceUvVectors[0][2] = vec3(1.0, 0.0, 0.0); // +x face
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// -y
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faceUvVectors[3][0] = vec3(1.0, 0.0, 0.0); // u -> +x
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faceUvVectors[3][1] = vec3(0.0, 0.0, -1.0); // v -> -z
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faceUvVectors[3][2] = vec3(0.0, -1.0, 0.0); // -y face
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// +y
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faceUvVectors[2][0] = vec3(1.0, 0.0, 0.0); // u -> +x
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faceUvVectors[2][1] = vec3(0.0, 0.0, 1.0); // v -> +z
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faceUvVectors[2][2] = vec3(0.0, 1.0, 0.0); // +y face
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// -z
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faceUvVectors[5][0] = vec3(-1.0, 0.0, 0.0); // u -> -x
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faceUvVectors[5][1] = vec3(0.0, -1.0, 0.0); // v -> -y
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faceUvVectors[5][2] = vec3(0.0, 0.0, -1.0); // -z face
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// +z
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faceUvVectors[4][0] = vec3(1.0, 0.0, 0.0); // u -> +x
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faceUvVectors[4][1] = vec3(0.0, -1.0, 0.0); // v -> -y
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faceUvVectors[4][2] = vec3(0.0, 0.0, 1.0); // +z face
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*/
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// -x
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faceUvVectors[0][0] = vec3(0.0, 0.0, 1.0); // u -> +z
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faceUvVectors[0][1] = vec3(0.0, -1.0, 0.0); // v -> -y
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faceUvVectors[0][2] = vec3(-1.0, 0.0, 0.0); // -x face
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// +x
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faceUvVectors[1][0] = vec3(0.0, 0.0, -1.0); // u -> -z
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faceUvVectors[1][1] = vec3(0.0, -1.0, 0.0); // v -> -y
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faceUvVectors[1][2] = vec3(1.0, 0.0, 0.0); // +x face
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// -y
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faceUvVectors[2][0] = vec3(1.0, 0.0, 0.0); // u -> +x
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faceUvVectors[2][1] = vec3(0.0, 0.0, -1.0); // v -> -z
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faceUvVectors[2][2] = vec3(0.0, -1.0, 0.0); // -y face
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// +y
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faceUvVectors[3][0] = vec3(1.0, 0.0, 0.0); // u -> +x
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faceUvVectors[3][1] = vec3(0.0, 0.0, 1.0); // v -> +z
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faceUvVectors[3][2] = vec3(0.0, 1.0, 0.0); // +y face
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// -z
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faceUvVectors[4][0] = vec3(-1.0, 0.0, 0.0); // u -> -x
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faceUvVectors[4][1] = vec3(0.0, -1.0, 0.0); // v -> -y
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faceUvVectors[4][2] = vec3(0.0, 0.0, -1.0); // -z face
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// +z
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faceUvVectors[5][0] = vec3(1.0, 0.0, 0.0); // u -> +x
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faceUvVectors[5][1] = vec3(0.0, -1.0, 0.0); // v -> -y
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faceUvVectors[5][2] = vec3(0.0, 0.0, 1.0); // +z face
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// out = u * s_faceUv[0] + v * s_faceUv[1] + s_faceUv[2].
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vec3 result = (faceUvVectors[faceID][0] * uv.x) + (faceUvVectors[faceID][1] * uv.y) + faceUvVectors[faceID][2];
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return normalize(result);
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}
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vec3 ImportanceSampleGGX(vec2 Xi, float Roughness, vec3 N)
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{
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float a = Roughness * Roughness; // DISNEY'S ROUGHNESS [see Burley'12 siggraph]
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// Compute distribution direction
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float Phi = 2.0 * M_PI * Xi.x;
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float CosTheta = sqrt((1.0 - Xi.y) / (1.0 + (a*a - 1.0) * Xi.y));
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float SinTheta = sqrt(1.0 - CosTheta * CosTheta);
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// Convert to spherical direction
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vec3 H;
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H.x = SinTheta * cos(Phi);
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H.y = SinTheta * sin(Phi);
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H.z = CosTheta;
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vec3 UpVector = abs(N.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(1.0, 0.0, 0.0);
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vec3 TangentX = normalize(cross(UpVector, N));
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vec3 TangentY = cross(N, TangentX);
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// Tangent to world space
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return TangentX * H.x + TangentY * H.y + N * H.z;
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}
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// http://graphicrants.blogspot.com.au/2013/08/specular-brdf-reference.html
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float GGX(float NdotV, float a)
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{
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float k = a / 2.0;
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return NdotV / (NdotV * (1.0 - k) + k);
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}
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// http://graphicrants.blogspot.com.au/2013/08/specular-brdf-reference.html
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float G_Smith(float a, float nDotV, float nDotL)
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{
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return GGX(nDotL, a * a) * GGX(nDotV, a * a);
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}
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float radicalInverse_VdC(uint bits) {
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bits = (bits << 16u) | (bits >> 16u);
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bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u);
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bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u);
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bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u);
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bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u);
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return float(bits) * 2.3283064365386963e-10; // / 0x100000000
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}
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vec2 Hammersley(uint i, uint N) {
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return vec2(float(i)/float(N), radicalInverse_VdC(i));
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}
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#ifdef LOW_QUALITY
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#define SAMPLE_COUNT 64u
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#else
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#define SAMPLE_COUNT 512u
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#endif
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uniform bool z_flip;
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#ifdef USE_SOURCE_PANORAMA
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vec4 texturePanorama(vec3 normal,sampler2D pano ) {
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vec2 st = vec2(
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atan(normal.x, normal.z),
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acos(normal.y)
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);
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if(st.x < 0.0)
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st.x += M_PI*2.0;
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st/=vec2(M_PI*2.0,M_PI);
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return textureLod(pano,st,0.0);
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}
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#endif
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#ifdef USE_SOURCE_DUAL_PARABOLOID_ARRAY
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vec4 textureDualParaboloidArray(vec3 normal) {
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vec3 norm = normalize(normal);
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norm.xy/=1.0+abs(norm.z);
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norm.xy=norm.xy * vec2(0.5,0.25) + vec2(0.5,0.25);
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if (norm.z<0.0) {
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norm.y=0.5-norm.y+0.5;
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}
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return textureLod(source_dual_paraboloid_array, vec3(norm.xy, float(source_array_index) ), 0.0);
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}
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#endif
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void main() {
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#ifdef USE_DUAL_PARABOLOID
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vec3 N = vec3( uv_interp * 2.0 - 1.0, 0.0 );
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N.z = 0.5 - 0.5*((N.x * N.x) + (N.y * N.y));
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N = normalize(N);
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if (z_flip) {
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N.y=-N.y; //y is flipped to improve blending between both sides
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N.z=-N.z;
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}
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#else
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vec2 uv = (uv_interp * 2.0) - 1.0;
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vec3 N = texelCoordToVec(uv, face_id);
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#endif
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//vec4 color = color_interp;
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#ifdef USE_DIRECT_WRITE
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#ifdef USE_SOURCE_PANORAMA
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frag_color=vec4(texturePanorama(N,source_panorama).rgb,1.0);
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#endif
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#ifdef USE_SOURCE_DUAL_PARABOLOID_ARRAY
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frag_color=vec4(textureDualParaboloidArray(N).rgb,1.0);
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#endif
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#if !defined(USE_SOURCE_DUAL_PARABOLOID_ARRAY) && !defined(USE_SOURCE_PANORAMA)
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N.y=-N.y;
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frag_color=vec4(texture(N,source_cube).rgb,1.0);
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#endif
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#else
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vec4 sum = vec4(0.0, 0.0, 0.0, 0.0);
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for(uint sampleNum = 0u; sampleNum < SAMPLE_COUNT; sampleNum++) {
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vec2 xi = Hammersley(sampleNum, SAMPLE_COUNT);
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vec3 H = ImportanceSampleGGX( xi, roughness, N );
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vec3 V = N;
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vec3 L = normalize(2.0 * dot( V, H ) * H - V);
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float ndotl = clamp(dot(N, L),0.0,1.0);
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if (ndotl>0.0) {
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#ifdef USE_SOURCE_PANORAMA
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sum.rgb += texturePanorama(H,source_panorama).rgb *ndotl;
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#endif
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#ifdef USE_SOURCE_DUAL_PARABOLOID_ARRAY
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sum.rgb += textureDualParaboloidArray(H).rgb *ndotl;
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#endif
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#if !defined(USE_SOURCE_DUAL_PARABOLOID_ARRAY) && !defined(USE_SOURCE_PANORAMA)
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H.y=-H.y;
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sum.rgb += textureLod(source_cube, H, 0.0).rgb *ndotl;
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#endif
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sum.a += ndotl;
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}
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}
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sum /= sum.a;
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frag_color = vec4(sum.rgb, 1.0);
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#endif
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}
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