/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include shared #define YUV_FORMAT_NV12 0 #define YUV_FORMAT_P010 1 #define YUV_FORMAT_NV16 2 #define YUV_FORMAT_PLANAR 3 #define YUV_FORMAT_INTERLEAVED 4 //#define YUV_PRECISION mediump #define YUV_PRECISION highp #ifdef WR_VERTEX_SHADER #ifdef WR_FEATURE_TEXTURE_RECT #define TEX_SIZE_YUV(sampler) vec2(1.0) #else #define TEX_SIZE_YUV(sampler) vec2(TEX_SIZE(sampler).xy) #endif // `YuvRangedColorSpace` #define YUV_COLOR_SPACE_REC601_NARROW 0 #define YUV_COLOR_SPACE_REC601_FULL 1 #define YUV_COLOR_SPACE_REC709_NARROW 2 #define YUV_COLOR_SPACE_REC709_FULL 3 #define YUV_COLOR_SPACE_REC2020_NARROW 4 #define YUV_COLOR_SPACE_REC2020_FULL 5 #define YUV_COLOR_SPACE_GBR_IDENTITY 6 // The constants added to the Y, U and V components are applied in the fragment shader. // `rgbFromYuv` from https://jdashg.github.io/misc/colors/from-coeffs.html // The matrix is stored in column-major. const mat3 RgbFromYuv_Rec601 = mat3( 1.00000, 1.00000, 1.00000, 0.00000,-0.17207, 0.88600, 0.70100,-0.35707, 0.00000 ); const mat3 RgbFromYuv_Rec709 = mat3( 1.00000, 1.00000, 1.00000, 0.00000,-0.09366, 0.92780, 0.78740,-0.23406, 0.00000 ); const mat3 RgbFromYuv_Rec2020 = mat3( 1.00000, 1.00000, 1.00000, 0.00000,-0.08228, 0.94070, 0.73730,-0.28568, 0.00000 ); // The matrix is stored in column-major. // Identity is stored as GBR const mat3 RgbFromYuv_GbrIdentity = mat3( 0.0 , 1.0, 0.0, 0.0 , 0.0, 1.0, 1.0 , 0.0, 0.0 ); // - struct YuvPrimitive { int channel_bit_depth; int color_space; int yuv_format; }; struct YuvColorSamplingInfo { mat3 rgb_from_yuv; vec4 packed_zero_one_vals; }; struct YuvColorMatrixInfo { vec3 ycbcr_bias; mat3 rgb_from_debiased_ycbrc; }; // - vec4 yuv_channel_zero_one_identity(int bit_depth, float channel_max) { float all_ones_normalized = float((1 << bit_depth) - 1) / channel_max; return vec4(0.0, 0.0, all_ones_normalized, all_ones_normalized); } vec4 yuv_channel_zero_one_narrow_range(int bit_depth, float channel_max) { // Note: 512/1023 != 128/255 ivec4 zero_one_ints = ivec4(16, 128, 235, 240) << (bit_depth - 8); return vec4(zero_one_ints) / channel_max; } vec4 yuv_channel_zero_one_full_range(int bit_depth, float channel_max) { vec4 narrow = yuv_channel_zero_one_narrow_range(bit_depth, channel_max); vec4 identity = yuv_channel_zero_one_identity(bit_depth, channel_max); return vec4(0.0, narrow.y, identity.z, identity.w); } YuvColorSamplingInfo get_yuv_color_info(YuvPrimitive prim) { float channel_max = 255.0; if (prim.channel_bit_depth > 8) { if (prim.yuv_format == YUV_FORMAT_P010) { // This is an MSB format. channel_max = float((1 << prim.channel_bit_depth) - 1); } else { // For >8bpc, we get the low bits, not the high bits: // 10bpc(1.0): 0b0000_0011_1111_1111 channel_max = 65535.0; } } if (prim.color_space == YUV_COLOR_SPACE_REC601_NARROW) { return YuvColorSamplingInfo(RgbFromYuv_Rec601, yuv_channel_zero_one_narrow_range(prim.channel_bit_depth, channel_max)); } else if (prim.color_space == YUV_COLOR_SPACE_REC601_FULL) { return YuvColorSamplingInfo(RgbFromYuv_Rec601, yuv_channel_zero_one_full_range(prim.channel_bit_depth, channel_max)); } else if (prim.color_space == YUV_COLOR_SPACE_REC709_NARROW) { return YuvColorSamplingInfo(RgbFromYuv_Rec709, yuv_channel_zero_one_narrow_range(prim.channel_bit_depth, channel_max)); } else if (prim.color_space == YUV_COLOR_SPACE_REC709_FULL) { return YuvColorSamplingInfo(RgbFromYuv_Rec709, yuv_channel_zero_one_full_range(prim.channel_bit_depth, channel_max)); } else if (prim.color_space == YUV_COLOR_SPACE_REC2020_NARROW) { return YuvColorSamplingInfo(RgbFromYuv_Rec2020, yuv_channel_zero_one_narrow_range(prim.channel_bit_depth, channel_max)); } else if (prim.color_space == YUV_COLOR_SPACE_REC2020_FULL) { return YuvColorSamplingInfo(RgbFromYuv_Rec2020, yuv_channel_zero_one_full_range(prim.channel_bit_depth, channel_max)); } else { // Identity return YuvColorSamplingInfo(RgbFromYuv_GbrIdentity, yuv_channel_zero_one_identity(prim.channel_bit_depth, channel_max)); } } YuvColorMatrixInfo get_rgb_from_ycbcr_info(YuvPrimitive prim) { YuvColorSamplingInfo info = get_yuv_color_info(prim); vec2 zero = info.packed_zero_one_vals.xy; vec2 one = info.packed_zero_one_vals.zw; // Such that yuv_value = (ycbcr_sample - zero) / (one - zero) vec2 scale = 1.0 / (one - zero); YuvColorMatrixInfo mat_info; mat_info.ycbcr_bias = zero.xyy; mat3 yuv_from_debiased_ycbcr = mat3(scale.x, 0.0, 0.0, 0.0, scale.y, 0.0, 0.0, 0.0, scale.y); mat_info.rgb_from_debiased_ycbrc = info.rgb_from_yuv * yuv_from_debiased_ycbcr; return mat_info; } void write_uv_rect( vec2 uv0, vec2 uv1, vec2 f, vec2 texture_size, out vec2 uv, out vec4 uv_bounds ) { uv = mix(uv0, uv1, f); uv_bounds = vec4(uv0 + vec2(0.5), uv1 - vec2(0.5)); #ifndef WR_FEATURE_TEXTURE_RECT uv /= texture_size; uv_bounds /= texture_size.xyxy; #endif } #endif #ifdef WR_FRAGMENT_SHADER vec4 sample_yuv( int format, YUV_PRECISION vec3 ycbcr_bias, YUV_PRECISION mat3 rgb_from_debiased_ycbrc, vec2 in_uv_y, vec2 in_uv_u, vec2 in_uv_v, vec4 uv_bounds_y, vec4 uv_bounds_u, vec4 uv_bounds_v ) { YUV_PRECISION vec3 ycbcr_sample; switch (format) { case YUV_FORMAT_PLANAR: { // The yuv_planar format should have this third texture coordinate. vec2 uv_y = clamp(in_uv_y, uv_bounds_y.xy, uv_bounds_y.zw); vec2 uv_u = clamp(in_uv_u, uv_bounds_u.xy, uv_bounds_u.zw); vec2 uv_v = clamp(in_uv_v, uv_bounds_v.xy, uv_bounds_v.zw); ycbcr_sample.x = TEX_SAMPLE(sColor0, uv_y).r; ycbcr_sample.y = TEX_SAMPLE(sColor1, uv_u).r; ycbcr_sample.z = TEX_SAMPLE(sColor2, uv_v).r; } break; case YUV_FORMAT_NV12: case YUV_FORMAT_P010: case YUV_FORMAT_NV16: { vec2 uv_y = clamp(in_uv_y, uv_bounds_y.xy, uv_bounds_y.zw); vec2 uv_uv = clamp(in_uv_u, uv_bounds_u.xy, uv_bounds_u.zw); ycbcr_sample.x = TEX_SAMPLE(sColor0, uv_y).r; ycbcr_sample.yz = TEX_SAMPLE(sColor1, uv_uv).rg; } break; case YUV_FORMAT_INTERLEAVED: { // "The Y, Cb and Cr color channels within the 422 data are mapped into // the existing green, blue and red color channels." // https://www.khronos.org/registry/OpenGL/extensions/APPLE/APPLE_rgb_422.txt vec2 uv_y = clamp(in_uv_y, uv_bounds_y.xy, uv_bounds_y.zw); ycbcr_sample = TEX_SAMPLE(sColor0, uv_y).gbr; } break; default: ycbcr_sample = vec3(0.0); break; } //if (true) return vec4(ycbcr_sample, 1.0); // See the YuvColorMatrix definition for an explanation of where the constants come from. YUV_PRECISION vec3 rgb = rgb_from_debiased_ycbrc * (ycbcr_sample - ycbcr_bias); #if defined(WR_FEATURE_ALPHA_PASS) && defined(SWGL_CLIP_MASK) // Avoid out-of-range RGB values that can mess with blending. These occur due to invalid // YUV values outside the mappable space that never the less can be generated. rgb = clamp(rgb, 0.0, 1.0); #endif return vec4(rgb, 1.0); } #endif