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Diffstat (limited to 'shaders/godot3.4/10-13.shader_test')
| -rw-r--r-- | shaders/godot3.4/10-13.shader_test | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/shaders/godot3.4/10-13.shader_test b/shaders/godot3.4/10-13.shader_test new file mode 100644 index 0000000..40656f1 --- /dev/null +++ b/shaders/godot3.4/10-13.shader_test @@ -0,0 +1,381 @@ +[require] +GLSL >= 3.30 + +[fragment shader] +#version 330 +#define GLES_OVER_GL +#define USE_SOURCE_PANORAMA +#define USE_DUAL_PARABOLOID +precision highp float; +precision highp int; + +precision highp float; +/* clang-format on */ +precision highp int; + +#ifdef USE_SOURCE_PANORAMA +uniform sampler2D source_panorama; //texunit:0 +uniform float source_resolution; +#endif + +#ifdef USE_SOURCE_DUAL_PARABOLOID_ARRAY +uniform sampler2DArray source_dual_paraboloid_array; //texunit:0 +uniform int source_array_index; +#endif + +#ifdef USE_SOURCE_DUAL_PARABOLOID +uniform sampler2D source_dual_paraboloid; //texunit:0 +#endif + +#if defined(USE_SOURCE_DUAL_PARABOLOID) || defined(COMPUTE_IRRADIANCE) +uniform float source_mip_level; +#endif + +#if !defined(USE_SOURCE_DUAL_PARABOLOID_ARRAY) && !defined(USE_SOURCE_PANORAMA) && !defined(USE_SOURCE_DUAL_PARABOLOID) +uniform samplerCube source_cube; //texunit:0 +#endif + +uniform int face_id; +uniform float roughness; + +in highp vec2 uv_interp; + +layout(location = 0) out vec4 frag_color; + +#define M_PI 3.14159265359 + +vec3 texelCoordToVec(vec2 uv, int faceID) { + mat3 faceUvVectors[6]; + /* + // -x + faceUvVectors[1][0] = vec3(0.0, 0.0, 1.0); // u -> +z + faceUvVectors[1][1] = vec3(0.0, -1.0, 0.0); // v -> -y + faceUvVectors[1][2] = vec3(-1.0, 0.0, 0.0); // -x face + + // +x + faceUvVectors[0][0] = vec3(0.0, 0.0, -1.0); // u -> -z + faceUvVectors[0][1] = vec3(0.0, -1.0, 0.0); // v -> -y + faceUvVectors[0][2] = vec3(1.0, 0.0, 0.0); // +x face + + // -y + faceUvVectors[3][0] = vec3(1.0, 0.0, 0.0); // u -> +x + faceUvVectors[3][1] = vec3(0.0, 0.0, -1.0); // v -> -z + faceUvVectors[3][2] = vec3(0.0, -1.0, 0.0); // -y face + + // +y + faceUvVectors[2][0] = vec3(1.0, 0.0, 0.0); // u -> +x + faceUvVectors[2][1] = vec3(0.0, 0.0, 1.0); // v -> +z + faceUvVectors[2][2] = vec3(0.0, 1.0, 0.0); // +y face + + // -z + faceUvVectors[5][0] = vec3(-1.0, 0.0, 0.0); // u -> -x + faceUvVectors[5][1] = vec3(0.0, -1.0, 0.0); // v -> -y + faceUvVectors[5][2] = vec3(0.0, 0.0, -1.0); // -z face + + // +z + faceUvVectors[4][0] = vec3(1.0, 0.0, 0.0); // u -> +x + faceUvVectors[4][1] = vec3(0.0, -1.0, 0.0); // v -> -y + faceUvVectors[4][2] = vec3(0.0, 0.0, 1.0); // +z face + */ + + // -x + faceUvVectors[0][0] = vec3(0.0, 0.0, 1.0); // u -> +z + faceUvVectors[0][1] = vec3(0.0, -1.0, 0.0); // v -> -y + faceUvVectors[0][2] = vec3(-1.0, 0.0, 0.0); // -x face + + // +x + faceUvVectors[1][0] = vec3(0.0, 0.0, -1.0); // u -> -z + faceUvVectors[1][1] = vec3(0.0, -1.0, 0.0); // v -> -y + faceUvVectors[1][2] = vec3(1.0, 0.0, 0.0); // +x face + + // -y + faceUvVectors[2][0] = vec3(1.0, 0.0, 0.0); // u -> +x + faceUvVectors[2][1] = vec3(0.0, 0.0, -1.0); // v -> -z + faceUvVectors[2][2] = vec3(0.0, -1.0, 0.0); // -y face + + // +y + faceUvVectors[3][0] = vec3(1.0, 0.0, 0.0); // u -> +x + faceUvVectors[3][1] = vec3(0.0, 0.0, 1.0); // v -> +z + faceUvVectors[3][2] = vec3(0.0, 1.0, 0.0); // +y face + + // -z + faceUvVectors[4][0] = vec3(-1.0, 0.0, 0.0); // u -> -x + faceUvVectors[4][1] = vec3(0.0, -1.0, 0.0); // v -> -y + faceUvVectors[4][2] = vec3(0.0, 0.0, -1.0); // -z face + + // +z + faceUvVectors[5][0] = vec3(1.0, 0.0, 0.0); // u -> +x + faceUvVectors[5][1] = vec3(0.0, -1.0, 0.0); // v -> -y + faceUvVectors[5][2] = vec3(0.0, 0.0, 1.0); // +z face + + // out = u * s_faceUv[0] + v * s_faceUv[1] + s_faceUv[2]. + vec3 result = (faceUvVectors[faceID][0] * uv.x) + (faceUvVectors[faceID][1] * uv.y) + faceUvVectors[faceID][2]; + return normalize(result); +} + +vec3 ImportanceSampleGGX(vec2 Xi, float Roughness, vec3 N) { + float a = Roughness * Roughness; // DISNEY'S ROUGHNESS [see Burley'12 siggraph] + + // Compute distribution direction + float Phi = 2.0 * M_PI * Xi.x; + float CosTheta = sqrt((1.0 - Xi.y) / (1.0 + (a * a - 1.0) * Xi.y)); + float SinTheta = sqrt(1.0 - CosTheta * CosTheta); + + // Convert to spherical direction + vec3 H; + H.x = SinTheta * cos(Phi); + H.y = SinTheta * sin(Phi); + H.z = CosTheta; + + vec3 UpVector = abs(N.z) < 0.999 ? vec3(0.0, 0.0, 1.0) : vec3(1.0, 0.0, 0.0); + vec3 TangentX = normalize(cross(UpVector, N)); + vec3 TangentY = cross(N, TangentX); + + // Tangent to world space + return TangentX * H.x + TangentY * H.y + N * H.z; +} + +float DistributionGGX(vec3 N, vec3 H, float roughness) { + float a = roughness * roughness; + float a2 = a * a; + float NdotH = max(dot(N, H), 0.0); + float NdotH2 = NdotH * NdotH; + + float nom = a2; + float denom = (NdotH2 * (a2 - 1.0) + 1.0); + denom = M_PI * denom * denom; + + return nom / denom; +} + +// http://graphicrants.blogspot.com.au/2013/08/specular-brdf-reference.html +float GGX(float NdotV, float a) { + float k = a / 2.0; + return NdotV / (NdotV * (1.0 - k) + k); +} + +// http://graphicrants.blogspot.com.au/2013/08/specular-brdf-reference.html +float G_Smith(float a, float nDotV, float nDotL) { + return GGX(nDotL, a * a) * GGX(nDotV, a * a); +} + +float radicalInverse_VdC(uint bits) { + bits = (bits << 16u) | (bits >> 16u); + bits = ((bits & 0x55555555u) << 1u) | ((bits & 0xAAAAAAAAu) >> 1u); + bits = ((bits & 0x33333333u) << 2u) | ((bits & 0xCCCCCCCCu) >> 2u); + bits = ((bits & 0x0F0F0F0Fu) << 4u) | ((bits & 0xF0F0F0F0u) >> 4u); + bits = ((bits & 0x00FF00FFu) << 8u) | ((bits & 0xFF00FF00u) >> 8u); + return float(bits) * 2.3283064365386963e-10; // / 0x100000000 +} + +vec2 Hammersley(uint i, uint N) { + return vec2(float(i) / float(N), radicalInverse_VdC(i)); +} + +#ifdef LOW_QUALITY + +#define SAMPLE_COUNT 64u +#define SAMPLE_DELTA 0.1 + +#else + +#define SAMPLE_COUNT 512u +#define SAMPLE_DELTA 0.03 + +#endif + +uniform bool z_flip; + +#ifdef USE_SOURCE_PANORAMA + +vec4 texturePanorama(vec3 normal, sampler2D pano, float mipLevel) { + vec2 st = vec2( + atan(normal.x, normal.z), + acos(normal.y)); + + if (st.x < 0.0) + st.x += M_PI * 2.0; + + st /= vec2(M_PI * 2.0, M_PI); + + return textureLod(pano, st, mipLevel); +} + +#endif + +#ifdef USE_SOURCE_DUAL_PARABOLOID_ARRAY + +vec4 textureDualParaboloidArray(vec3 normal) { + vec3 norm = normalize(normal); + norm.xy /= 1.0 + abs(norm.z); + norm.xy = norm.xy * vec2(0.5, 0.25) + vec2(0.5, 0.25); + if (norm.z < 0.0) { + norm.y = 0.5 - norm.y + 0.5; + } + return textureLod(source_dual_paraboloid_array, vec3(norm.xy, float(source_array_index)), 0.0); +} + +#endif + +#ifdef USE_SOURCE_DUAL_PARABOLOID +vec4 textureDualParaboloid(vec3 normal) { + vec3 norm = normalize(normal); + norm.xy /= 1.0 + abs(norm.z); + norm.xy = norm.xy * vec2(0.5, 0.25) + vec2(0.5, 0.25); + if (norm.z < 0.0) { + norm.y = 0.5 - norm.y + 0.5; + } + return textureLod(source_dual_paraboloid, norm.xy, source_mip_level); +} + +#endif + +void main() { +#ifdef USE_DUAL_PARABOLOID + + vec3 N = vec3(uv_interp * 2.0 - 1.0, 0.0); + N.z = 0.5 - 0.5 * ((N.x * N.x) + (N.y * N.y)); + N = normalize(N); + + if (z_flip) { + N.y = -N.y; //y is flipped to improve blending between both sides + N.z = -N.z; + } + +#else + vec2 uv = (uv_interp * 2.0) - 1.0; + vec3 N = texelCoordToVec(uv, face_id); +#endif + //vec4 color = color_interp; + +#ifdef USE_DIRECT_WRITE + +#ifdef USE_SOURCE_PANORAMA + + frag_color = vec4(texturePanorama(N, source_panorama, 0.0).rgb, 1.0); +#endif + +#ifdef USE_SOURCE_DUAL_PARABOLOID_ARRAY + + frag_color = vec4(textureDualParaboloidArray(N).rgb, 1.0); +#endif + +#ifdef USE_SOURCE_DUAL_PARABOLOID + + frag_color = vec4(textureDualParaboloid(N).rgb, 1.0); +#endif + +#if !defined(USE_SOURCE_DUAL_PARABOLOID_ARRAY) && !defined(USE_SOURCE_PANORAMA) && !defined(USE_SOURCE_DUAL_PARABOLOID) + + N.y = -N.y; + frag_color = vec4(texture(N, source_cube).rgb, 1.0); +#endif + +#else // USE_DIRECT_WRITE + +#ifdef COMPUTE_IRRADIANCE + + vec3 irradiance = vec3(0.0); + + // tangent space calculation from origin point + vec3 UpVector = vec3(0.0, 1.0, 0.0); + vec3 TangentX = cross(UpVector, N); + vec3 TangentY = cross(N, TangentX); + + float num_samples = 0.0f; + + for (float phi = 0.0; phi < 2.0 * M_PI; phi += SAMPLE_DELTA) { + for (float theta = 0.0; theta < 0.5 * M_PI; theta += SAMPLE_DELTA) { + // Calculate sample positions + vec3 tangentSample = vec3(sin(theta) * cos(phi), sin(theta) * sin(phi), cos(theta)); + // Find world vector of sample position + vec3 H = tangentSample.x * TangentX + tangentSample.y * TangentY + tangentSample.z * N; + + vec2 st = vec2(atan(H.x, H.z), acos(H.y)); + if (st.x < 0.0) { + st.x += M_PI * 2.0; + } + st /= vec2(M_PI * 2.0, M_PI); + + irradiance += textureLod(source_panorama, st, source_mip_level).rgb * cos(theta) * sin(theta); + num_samples++; + } + } + irradiance = M_PI * irradiance * (1.0 / float(num_samples)); + + frag_color = vec4(irradiance, 1.0); + +#else + + vec4 sum = vec4(0.0, 0.0, 0.0, 0.0); + + for (uint sampleNum = 0u; sampleNum < SAMPLE_COUNT; sampleNum++) { + vec2 xi = Hammersley(sampleNum, SAMPLE_COUNT); + + vec3 H = normalize(ImportanceSampleGGX(xi, roughness, N)); + vec3 V = N; + vec3 L = normalize(2.0 * dot(V, H) * H - V); + + float ndotl = max(dot(N, L), 0.0); + + if (ndotl > 0.0) { + +#ifdef USE_SOURCE_PANORAMA + float D = DistributionGGX(N, H, roughness); + float ndoth = max(dot(N, H), 0.0); + float hdotv = max(dot(H, V), 0.0); + float pdf = D * ndoth / (4.0 * hdotv) + 0.0001; + + float saTexel = 4.0 * M_PI / (6.0 * source_resolution * source_resolution); + float saSample = 1.0 / (float(SAMPLE_COUNT) * pdf + 0.0001); + + float mipLevel = roughness == 0.0 ? 0.0 : 0.5 * log2(saSample / saTexel); + + sum.rgb += texturePanorama(L, source_panorama, mipLevel).rgb * ndotl; +#endif + +#ifdef USE_SOURCE_DUAL_PARABOLOID_ARRAY + sum.rgb += textureDualParaboloidArray(L).rgb * ndotl; +#endif + +#ifdef USE_SOURCE_DUAL_PARABOLOID + sum.rgb += textureDualParaboloid(L).rgb * ndotl; +#endif + +#if !defined(USE_SOURCE_DUAL_PARABOLOID_ARRAY) && !defined(USE_SOURCE_PANORAMA) && !defined(USE_SOURCE_DUAL_PARABOLOID) + L.y = -L.y; + sum.rgb += textureLod(source_cube, L, 0.0).rgb * ndotl; +#endif + sum.a += ndotl; + } + } + sum /= sum.a; + + frag_color = vec4(sum.rgb, 1.0); + +#endif // COMPUTE_IRRADIANCE +#endif // USE_DIRECT_WRITE +} + +[vertex shader] +#version 330 +#define GLES_OVER_GL +#define USE_SOURCE_PANORAMA +#define USE_DUAL_PARABOLOID +precision highp float; +precision highp int; + +layout(location = 0) in highp vec2 vertex; +/* clang-format on */ + +layout(location = 4) in highp vec2 uv; + +out highp vec2 uv_interp; + +void main() { + uv_interp = uv; + gl_Position = vec4(vertex, 0, 1); +} + +/* clang-format off */ + |