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[Sample] [Graphics] UltraHDR x OpenGL shaders with SurfaceView bright…
…ness control (#131) * UltraHDR with OpenGL graphics pipeline initial implementation * Rename files to be consistent * Updates to GL Shader Logic + GL Library Logic * Update fragment implementation to control extended range brightness * Added copyright docs * Fixes after merge
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111 changes: 111 additions & 0 deletions
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samples/graphics/ultrahdr/src/main/assets/shaders/fs_uhdr_tonemapper.frag
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| /* | ||
| * Copyright 2023 The Android Open Source Project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| // This fragment shader performs tone mapping by converting HDR image data into SDR format | ||
| // using a combination of transfer functions, Gainmap adjustments, exposure and gamma | ||
| // correction factors, and epsilon values for numerical stability. | ||
| precision mediump float; | ||
| varying vec2 vTextureCoord; | ||
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| uniform highp float srcTF[7]; | ||
| uniform highp mat3 gamutTransform; | ||
| uniform highp float destTF[7]; | ||
| uniform sampler2D base; | ||
| uniform sampler2D gainmap; | ||
| uniform mediump vec3 logRatioMin; | ||
| uniform mediump vec3 logRatioMax; | ||
| uniform mediump vec3 gainmapGamma; | ||
| uniform mediump vec3 epsilonSdr; | ||
| uniform mediump vec3 epsilonHdr; | ||
| uniform mediump float W; | ||
| uniform highp int gainmapIsAlpha; | ||
| uniform highp int singleChannel; | ||
| uniform highp int noGamma; | ||
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| highp float fromSrc(highp float x) { | ||
| highp float G = srcTF[0]; | ||
| highp float A = srcTF[1]; | ||
| highp float B = srcTF[2]; | ||
| highp float C = srcTF[3]; | ||
| highp float D = srcTF[4]; | ||
| highp float E = srcTF[5]; | ||
| highp float F = srcTF[6]; | ||
| highp float s = sign(x); | ||
| x = abs(x); | ||
| x = x < D ? C * x + F : pow(A * x + B, G) + E; | ||
| return s * x; | ||
| } | ||
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| highp float toDest(highp float x) { | ||
| highp float G = destTF[0]; | ||
| highp float A = destTF[1]; | ||
| highp float B = destTF[2]; | ||
| highp float C = destTF[3]; | ||
| highp float D = destTF[4]; | ||
| highp float E = destTF[5]; | ||
| highp float F = destTF[6]; | ||
| highp float s = sign(x); | ||
| x = abs(x); | ||
| x = x < D ? C * x + F : pow(A * x + B, G) + E; | ||
| return s * x; | ||
| } | ||
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| highp vec4 sampleBase(vec2 coord) { | ||
| vec4 color = texture2D(base, vTextureCoord); | ||
| color = vec4(color.xyz / max(color.w, 0.0001), color.w); | ||
| color.x = fromSrc(color.x); | ||
| color.y = fromSrc(color.y); | ||
| color.z = fromSrc(color.z); | ||
| color.xyz *= color.w; | ||
| return color; | ||
| } | ||
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| void main() { | ||
| vec4 S = sampleBase(vTextureCoord); | ||
| vec4 G = texture2D(gainmap, vTextureCoord); | ||
| vec3 H; | ||
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| if (gainmapIsAlpha == 1) { | ||
| G = vec4(G.w, G.w, G.w, 1.0); | ||
| mediump float L; | ||
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| if (noGamma == 1) { | ||
| L = mix(logRatioMin.x, logRatioMax.x, G.x); | ||
| } else { | ||
| L = mix(logRatioMin.x, logRatioMax.x, pow(G.x, gainmapGamma.x)); | ||
| } | ||
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| H = (S.xyz + epsilonSdr) * exp(L * W) - epsilonHdr; | ||
| } else { | ||
| mediump vec3 L; | ||
| if (noGamma == 1) { | ||
| L = mix(logRatioMin, logRatioMax, G.xyz); | ||
| } else { | ||
| L = mix(logRatioMin, logRatioMax, pow(G.xyz, gainmapGamma)); | ||
| } | ||
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| H = (S.xyz + epsilonSdr) * exp(L * W) - epsilonHdr; | ||
| } | ||
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| vec4 result = vec4(H.xyz / max(S.w, 0.0001), S.w); | ||
| result.rgb = (gamutTransform * result.rgb); | ||
| result.x = toDest(result.x); | ||
| result.y = toDest(result.y); | ||
| result.z = toDest(result.z); | ||
| result.xyz *= result.w; | ||
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| gl_FragColor = result; | ||
| } |
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samples/graphics/ultrahdr/src/main/assets/shaders/vs_uhdr_texture_sampling.vert
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| /* | ||
| * Copyright 2023 The Android Open Source Project | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * https://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| // This vertex shader program transforms vertices from object space to clip space and | ||
| // prepares texture coordinates for fragment shader processing in a fragment shader. | ||
| // | ||
| // refer to fs_uhdr_tonemapper.frag | ||
| // | ||
| uniform mat4 uMVPMatrix; | ||
| attribute vec4 aPosition; | ||
| attribute vec2 aTextureCoord; | ||
| varying vec2 vTextureCoord; | ||
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| void main() { | ||
| gl_Position = uMVPMatrix * aPosition; | ||
| vTextureCoord = aTextureCoord; | ||
| } |
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