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Unified Diff: src/gpu/gl/GrGLSLBlend.cpp

Issue 1434313002: Make all GrFragmentProcessors GL independent. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: Created 5 years, 1 month ago
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Index: src/gpu/gl/GrGLSLBlend.cpp
diff --git a/src/gpu/gl/GrGLSLBlend.cpp b/src/gpu/gl/GrGLSLBlend.cpp
deleted file mode 100644
index 3c83068fc19aa8785f01c5118ae79e59070d7eed..0000000000000000000000000000000000000000
--- a/src/gpu/gl/GrGLSLBlend.cpp
+++ /dev/null
@@ -1,435 +0,0 @@
-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#include "GrGLSLBlend.h"
-#include "glsl/GrGLSLFragmentShaderBuilder.h"
-
-//////////////////////////////////////////////////////////////////////////////
-// Advanced (non-coeff) blend helpers
-//////////////////////////////////////////////////////////////////////////////
-
-static void hard_light(GrGLSLFragmentBuilder* fsBuilder,
- const char* final,
- const char* src,
- const char* dst) {
- static const char kComponents[] = { 'r', 'g', 'b' };
- for (size_t i = 0; i < SK_ARRAY_COUNT(kComponents); ++i) {
- char component = kComponents[i];
- fsBuilder->codeAppendf("if (2.0 * %s.%c <= %s.a) {", src, component, src);
- fsBuilder->codeAppendf("%s.%c = 2.0 * %s.%c * %s.%c;",
- final, component, src, component, dst, component);
- fsBuilder->codeAppend("} else {");
- fsBuilder->codeAppendf("%s.%c = %s.a * %s.a - 2.0 * (%s.a - %s.%c) * (%s.a - %s.%c);",
- final, component, src, dst, dst, dst, component, src, src,
- component);
- fsBuilder->codeAppend("}");
- }
- fsBuilder->codeAppendf("%s.rgb += %s.rgb * (1.0 - %s.a) + %s.rgb * (1.0 - %s.a);",
- final, src, dst, dst, src);
-}
-
-// Does one component of color-dodge
-static void color_dodge_component(GrGLSLFragmentBuilder* fsBuilder,
- const char* final,
- const char* src,
- const char* dst,
- const char component) {
- fsBuilder->codeAppendf("if (0.0 == %s.%c) {", dst, component);
- fsBuilder->codeAppendf("%s.%c = %s.%c * (1.0 - %s.a);",
- final, component, src, component, dst);
- fsBuilder->codeAppend("} else {");
- fsBuilder->codeAppendf("float d = %s.a - %s.%c;", src, src, component);
- fsBuilder->codeAppend("if (0.0 == d) {");
- fsBuilder->codeAppendf("%s.%c = %s.a * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);",
- final, component, src, dst, src, component, dst, dst, component,
- src);
- fsBuilder->codeAppend("} else {");
- fsBuilder->codeAppendf("d = min(%s.a, %s.%c * %s.a / d);",
- dst, dst, component, src);
- fsBuilder->codeAppendf("%s.%c = d * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);",
- final, component, src, src, component, dst, dst, component, src);
- fsBuilder->codeAppend("}");
- fsBuilder->codeAppend("}");
-}
-
-// Does one component of color-burn
-static void color_burn_component(GrGLSLFragmentBuilder* fsBuilder,
- const char* final,
- const char* src,
- const char* dst,
- const char component) {
- fsBuilder->codeAppendf("if (%s.a == %s.%c) {", dst, dst, component);
- fsBuilder->codeAppendf("%s.%c = %s.a * %s.a + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);",
- final, component, src, dst, src, component, dst, dst, component,
- src);
- fsBuilder->codeAppendf("} else if (0.0 == %s.%c) {", src, component);
- fsBuilder->codeAppendf("%s.%c = %s.%c * (1.0 - %s.a);",
- final, component, dst, component, src);
- fsBuilder->codeAppend("} else {");
- fsBuilder->codeAppendf("float d = max(0.0, %s.a - (%s.a - %s.%c) * %s.a / %s.%c);",
- dst, dst, dst, component, src, src, component);
- fsBuilder->codeAppendf("%s.%c = %s.a * d + %s.%c * (1.0 - %s.a) + %s.%c * (1.0 - %s.a);",
- final, component, src, src, component, dst, dst, component, src);
- fsBuilder->codeAppend("}");
-}
-
-// Does one component of soft-light. Caller should have already checked that dst alpha > 0.
-static void soft_light_component_pos_dst_alpha(GrGLSLFragmentBuilder* fsBuilder,
- const char* final,
- const char* src,
- const char* dst,
- const char component) {
- // if (2S < Sa)
- fsBuilder->codeAppendf("if (2.0 * %s.%c <= %s.a) {", src, component, src);
- // (D^2 (Sa-2 S))/Da+(1-Da) S+D (-Sa+2 S+1)
- fsBuilder->codeAppendf("%s.%c = (%s.%c*%s.%c*(%s.a - 2.0*%s.%c)) / %s.a +"
- "(1.0 - %s.a) * %s.%c + %s.%c*(-%s.a + 2.0*%s.%c + 1.0);",
- final, component, dst, component, dst, component, src, src,
- component, dst, dst, src, component, dst, component, src, src,
- component);
- // else if (4D < Da)
- fsBuilder->codeAppendf("} else if (4.0 * %s.%c <= %s.a) {",
- dst, component, dst);
- fsBuilder->codeAppendf("float DSqd = %s.%c * %s.%c;",
- dst, component, dst, component);
- fsBuilder->codeAppendf("float DCub = DSqd * %s.%c;", dst, component);
- fsBuilder->codeAppendf("float DaSqd = %s.a * %s.a;", dst, dst);
- fsBuilder->codeAppendf("float DaCub = DaSqd * %s.a;", dst);
- // (Da^3 (-S)+Da^2 (S-D (3 Sa-6 S-1))+12 Da D^2 (Sa-2 S)-16 D^3 (Sa-2 S))/Da^2
- fsBuilder->codeAppendf("%s.%c ="
- "(DaSqd*(%s.%c - %s.%c * (3.0*%s.a - 6.0*%s.%c - 1.0)) +"
- " 12.0*%s.a*DSqd*(%s.a - 2.0*%s.%c) - 16.0*DCub * (%s.a - 2.0*%s.%c) -"
- " DaCub*%s.%c) / DaSqd;",
- final, component, src, component, dst, component,
- src, src, component, dst, src, src, component, src, src,
- component, src, component);
- fsBuilder->codeAppendf("} else {");
- // -sqrt(Da * D) (Sa-2 S)-Da S+D (Sa-2 S+1)+S
- fsBuilder->codeAppendf("%s.%c = %s.%c*(%s.a - 2.0*%s.%c + 1.0) + %s.%c -"
- " sqrt(%s.a*%s.%c)*(%s.a - 2.0*%s.%c) - %s.a*%s.%c;",
- final, component, dst, component, src, src, component, src, component,
- dst, dst, component, src, src, component, dst, src, component);
- fsBuilder->codeAppendf("}");
-}
-
-// Adds a function that takes two colors and an alpha as input. It produces a color with the
-// hue and saturation of the first color, the luminosity of the second color, and the input
-// alpha. It has this signature:
-// vec3 set_luminance(vec3 hueSatColor, float alpha, vec3 lumColor).
-static void add_lum_function(GrGLSLFragmentBuilder* fsBuilder, SkString* setLumFunction) {
- // Emit a helper that gets the luminance of a color.
- SkString getFunction;
- GrGLSLShaderVar getLumArgs[] = {
- GrGLSLShaderVar("color", kVec3f_GrSLType),
- };
- SkString getLumBody("return dot(vec3(0.3, 0.59, 0.11), color);");
- fsBuilder->emitFunction(kFloat_GrSLType,
- "luminance",
- SK_ARRAY_COUNT(getLumArgs), getLumArgs,
- getLumBody.c_str(),
- &getFunction);
-
- // Emit the set luminance function.
- GrGLSLShaderVar setLumArgs[] = {
- GrGLSLShaderVar("hueSat", kVec3f_GrSLType),
- GrGLSLShaderVar("alpha", kFloat_GrSLType),
- GrGLSLShaderVar("lumColor", kVec3f_GrSLType),
- };
- SkString setLumBody;
- setLumBody.printf("float diff = %s(lumColor - hueSat);", getFunction.c_str());
- setLumBody.append("vec3 outColor = hueSat + diff;");
- setLumBody.appendf("float outLum = %s(outColor);", getFunction.c_str());
- setLumBody.append("float minComp = min(min(outColor.r, outColor.g), outColor.b);"
- "float maxComp = max(max(outColor.r, outColor.g), outColor.b);"
- "if (minComp < 0.0 && outLum != minComp) {"
- "outColor = outLum + ((outColor - vec3(outLum, outLum, outLum)) * outLum) /"
- "(outLum - minComp);"
- "}"
- "if (maxComp > alpha && maxComp != outLum) {"
- "outColor = outLum +"
- "((outColor - vec3(outLum, outLum, outLum)) * (alpha - outLum)) /"
- "(maxComp - outLum);"
- "}"
- "return outColor;");
- fsBuilder->emitFunction(kVec3f_GrSLType,
- "set_luminance",
- SK_ARRAY_COUNT(setLumArgs), setLumArgs,
- setLumBody.c_str(),
- setLumFunction);
-}
-
-// Adds a function that creates a color with the hue and luminosity of one input color and
-// the saturation of another color. It will have this signature:
-// float set_saturation(vec3 hueLumColor, vec3 satColor)
-static void add_sat_function(GrGLSLFragmentBuilder* fsBuilder, SkString* setSatFunction) {
- // Emit a helper that gets the saturation of a color
- SkString getFunction;
- GrGLSLShaderVar getSatArgs[] = { GrGLSLShaderVar("color", kVec3f_GrSLType) };
- SkString getSatBody;
- getSatBody.printf("return max(max(color.r, color.g), color.b) - "
- "min(min(color.r, color.g), color.b);");
- fsBuilder->emitFunction(kFloat_GrSLType,
- "saturation",
- SK_ARRAY_COUNT(getSatArgs), getSatArgs,
- getSatBody.c_str(),
- &getFunction);
-
- // Emit a helper that sets the saturation given sorted input channels. This used
- // to use inout params for min, mid, and max components but that seems to cause
- // problems on PowerVR drivers. So instead it returns a vec3 where r, g ,b are the
- // adjusted min, mid, and max inputs, respectively.
- SkString helperFunction;
- GrGLSLShaderVar helperArgs[] = {
- GrGLSLShaderVar("minComp", kFloat_GrSLType),
- GrGLSLShaderVar("midComp", kFloat_GrSLType),
- GrGLSLShaderVar("maxComp", kFloat_GrSLType),
- GrGLSLShaderVar("sat", kFloat_GrSLType),
- };
- static const char kHelperBody[] = "if (minComp < maxComp) {"
- "vec3 result;"
- "result.r = 0.0;"
- "result.g = sat * (midComp - minComp) / (maxComp - minComp);"
- "result.b = sat;"
- "return result;"
- "} else {"
- "return vec3(0, 0, 0);"
- "}";
- fsBuilder->emitFunction(kVec3f_GrSLType,
- "set_saturation_helper",
- SK_ARRAY_COUNT(helperArgs), helperArgs,
- kHelperBody,
- &helperFunction);
-
- GrGLSLShaderVar setSatArgs[] = {
- GrGLSLShaderVar("hueLumColor", kVec3f_GrSLType),
- GrGLSLShaderVar("satColor", kVec3f_GrSLType),
- };
- const char* helpFunc = helperFunction.c_str();
- SkString setSatBody;
- setSatBody.appendf("float sat = %s(satColor);"
- "if (hueLumColor.r <= hueLumColor.g) {"
- "if (hueLumColor.g <= hueLumColor.b) {"
- "hueLumColor.rgb = %s(hueLumColor.r, hueLumColor.g, hueLumColor.b, sat);"
- "} else if (hueLumColor.r <= hueLumColor.b) {"
- "hueLumColor.rbg = %s(hueLumColor.r, hueLumColor.b, hueLumColor.g, sat);"
- "} else {"
- "hueLumColor.brg = %s(hueLumColor.b, hueLumColor.r, hueLumColor.g, sat);"
- "}"
- "} else if (hueLumColor.r <= hueLumColor.b) {"
- "hueLumColor.grb = %s(hueLumColor.g, hueLumColor.r, hueLumColor.b, sat);"
- "} else if (hueLumColor.g <= hueLumColor.b) {"
- "hueLumColor.gbr = %s(hueLumColor.g, hueLumColor.b, hueLumColor.r, sat);"
- "} else {"
- "hueLumColor.bgr = %s(hueLumColor.b, hueLumColor.g, hueLumColor.r, sat);"
- "}"
- "return hueLumColor;",
- getFunction.c_str(), helpFunc, helpFunc, helpFunc, helpFunc,
- helpFunc, helpFunc);
- fsBuilder->emitFunction(kVec3f_GrSLType,
- "set_saturation",
- SK_ARRAY_COUNT(setSatArgs), setSatArgs,
- setSatBody.c_str(),
- setSatFunction);
-}
-
-static void emit_advanced_xfermode_code(GrGLSLFragmentBuilder* fsBuilder, const char* srcColor,
- const char* dstColor, const char* outputColor,
- SkXfermode::Mode mode) {
- SkASSERT(srcColor);
- SkASSERT(dstColor);
- SkASSERT(outputColor);
- // These all perform src-over on the alpha channel.
- fsBuilder->codeAppendf("%s.a = %s.a + (1.0 - %s.a) * %s.a;",
- outputColor, srcColor, srcColor, dstColor);
-
- switch (mode) {
- case SkXfermode::kOverlay_Mode:
- // Overlay is Hard-Light with the src and dst reversed
- hard_light(fsBuilder, outputColor, dstColor, srcColor);
- break;
- case SkXfermode::kDarken_Mode:
- fsBuilder->codeAppendf("%s.rgb = min((1.0 - %s.a) * %s.rgb + %s.rgb, "
- "(1.0 - %s.a) * %s.rgb + %s.rgb);",
- outputColor,
- srcColor, dstColor, srcColor,
- dstColor, srcColor, dstColor);
- break;
- case SkXfermode::kLighten_Mode:
- fsBuilder->codeAppendf("%s.rgb = max((1.0 - %s.a) * %s.rgb + %s.rgb, "
- "(1.0 - %s.a) * %s.rgb + %s.rgb);",
- outputColor,
- srcColor, dstColor, srcColor,
- dstColor, srcColor, dstColor);
- break;
- case SkXfermode::kColorDodge_Mode:
- color_dodge_component(fsBuilder, outputColor, srcColor, dstColor, 'r');
- color_dodge_component(fsBuilder, outputColor, srcColor, dstColor, 'g');
- color_dodge_component(fsBuilder, outputColor, srcColor, dstColor, 'b');
- break;
- case SkXfermode::kColorBurn_Mode:
- color_burn_component(fsBuilder, outputColor, srcColor, dstColor, 'r');
- color_burn_component(fsBuilder, outputColor, srcColor, dstColor, 'g');
- color_burn_component(fsBuilder, outputColor, srcColor, dstColor, 'b');
- break;
- case SkXfermode::kHardLight_Mode:
- hard_light(fsBuilder, outputColor, srcColor, dstColor);
- break;
- case SkXfermode::kSoftLight_Mode:
- fsBuilder->codeAppendf("if (0.0 == %s.a) {", dstColor);
- fsBuilder->codeAppendf("%s.rgba = %s;", outputColor, srcColor);
- fsBuilder->codeAppendf("} else {");
- soft_light_component_pos_dst_alpha(fsBuilder, outputColor, srcColor, dstColor, 'r');
- soft_light_component_pos_dst_alpha(fsBuilder, outputColor, srcColor, dstColor, 'g');
- soft_light_component_pos_dst_alpha(fsBuilder, outputColor, srcColor, dstColor, 'b');
- fsBuilder->codeAppendf("}");
- break;
- case SkXfermode::kDifference_Mode:
- fsBuilder->codeAppendf("%s.rgb = %s.rgb + %s.rgb -"
- "2.0 * min(%s.rgb * %s.a, %s.rgb * %s.a);",
- outputColor, srcColor, dstColor, srcColor, dstColor,
- dstColor, srcColor);
- break;
- case SkXfermode::kExclusion_Mode:
- fsBuilder->codeAppendf("%s.rgb = %s.rgb + %s.rgb - "
- "2.0 * %s.rgb * %s.rgb;",
- outputColor, dstColor, srcColor, dstColor, srcColor);
- break;
- case SkXfermode::kMultiply_Mode:
- fsBuilder->codeAppendf("%s.rgb = (1.0 - %s.a) * %s.rgb + "
- "(1.0 - %s.a) * %s.rgb + "
- "%s.rgb * %s.rgb;",
- outputColor, srcColor, dstColor, dstColor, srcColor,
- srcColor, dstColor);
- break;
- case SkXfermode::kHue_Mode: {
- // SetLum(SetSat(S * Da, Sat(D * Sa)), Sa*Da, D*Sa) + (1 - Sa) * D + (1 - Da) * S
- SkString setSat, setLum;
- add_sat_function(fsBuilder, &setSat);
- add_lum_function(fsBuilder, &setLum);
- fsBuilder->codeAppendf("vec4 dstSrcAlpha = %s * %s.a;",
- dstColor, srcColor);
- fsBuilder->codeAppendf("%s.rgb = %s(%s(%s.rgb * %s.a, dstSrcAlpha.rgb),"
- "dstSrcAlpha.a, dstSrcAlpha.rgb);",
- outputColor, setLum.c_str(), setSat.c_str(), srcColor,
- dstColor);
- fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;",
- outputColor, srcColor, dstColor, dstColor, srcColor);
- break;
- }
- case SkXfermode::kSaturation_Mode: {
- // SetLum(SetSat(D * Sa, Sat(S * Da)), Sa*Da, D*Sa)) + (1 - Sa) * D + (1 - Da) * S
- SkString setSat, setLum;
- add_sat_function(fsBuilder, &setSat);
- add_lum_function(fsBuilder, &setLum);
- fsBuilder->codeAppendf("vec4 dstSrcAlpha = %s * %s.a;",
- dstColor, srcColor);
- fsBuilder->codeAppendf("%s.rgb = %s(%s(dstSrcAlpha.rgb, %s.rgb * %s.a),"
- "dstSrcAlpha.a, dstSrcAlpha.rgb);",
- outputColor, setLum.c_str(), setSat.c_str(), srcColor,
- dstColor);
- fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;",
- outputColor, srcColor, dstColor, dstColor, srcColor);
- break;
- }
- case SkXfermode::kColor_Mode: {
- // SetLum(S * Da, Sa* Da, D * Sa) + (1 - Sa) * D + (1 - Da) * S
- SkString setLum;
- add_lum_function(fsBuilder, &setLum);
- fsBuilder->codeAppendf("vec4 srcDstAlpha = %s * %s.a;",
- srcColor, dstColor);
- fsBuilder->codeAppendf("%s.rgb = %s(srcDstAlpha.rgb, srcDstAlpha.a, %s.rgb * %s.a);",
- outputColor, setLum.c_str(), dstColor, srcColor);
- fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;",
- outputColor, srcColor, dstColor, dstColor, srcColor);
- break;
- }
- case SkXfermode::kLuminosity_Mode: {
- // SetLum(D * Sa, Sa* Da, S * Da) + (1 - Sa) * D + (1 - Da) * S
- SkString setLum;
- add_lum_function(fsBuilder, &setLum);
- fsBuilder->codeAppendf("vec4 srcDstAlpha = %s * %s.a;",
- srcColor, dstColor);
- fsBuilder->codeAppendf("%s.rgb = %s(%s.rgb * %s.a, srcDstAlpha.a, srcDstAlpha.rgb);",
- outputColor, setLum.c_str(), dstColor, srcColor);
- fsBuilder->codeAppendf("%s.rgb += (1.0 - %s.a) * %s.rgb + (1.0 - %s.a) * %s.rgb;",
- outputColor, srcColor, dstColor, dstColor, srcColor);
- break;
- }
- default:
- SkFAIL("Unknown Custom Xfer mode.");
- break;
- }
-}
-
-//////////////////////////////////////////////////////////////////////////////
-// Porter-Duff blend helper
-//////////////////////////////////////////////////////////////////////////////
-
-static bool append_porterduff_term(GrGLSLFragmentBuilder* fsBuilder, SkXfermode::Coeff coeff,
- const char* colorName, const char* srcColorName,
- const char* dstColorName, bool hasPrevious) {
- if (SkXfermode::kZero_Coeff == coeff) {
- return hasPrevious;
- } else {
- if (hasPrevious) {
- fsBuilder->codeAppend(" + ");
- }
- fsBuilder->codeAppendf("%s", colorName);
- switch (coeff) {
- case SkXfermode::kOne_Coeff:
- break;
- case SkXfermode::kSC_Coeff:
- fsBuilder->codeAppendf(" * %s", srcColorName);
- break;
- case SkXfermode::kISC_Coeff:
- fsBuilder->codeAppendf(" * (vec4(1.0) - %s)", srcColorName);
- break;
- case SkXfermode::kDC_Coeff:
- fsBuilder->codeAppendf(" * %s", dstColorName);
- break;
- case SkXfermode::kIDC_Coeff:
- fsBuilder->codeAppendf(" * (vec4(1.0) - %s)", dstColorName);
- break;
- case SkXfermode::kSA_Coeff:
- fsBuilder->codeAppendf(" * %s.a", srcColorName);
- break;
- case SkXfermode::kISA_Coeff:
- fsBuilder->codeAppendf(" * (1.0 - %s.a)", srcColorName);
- break;
- case SkXfermode::kDA_Coeff:
- fsBuilder->codeAppendf(" * %s.a", dstColorName);
- break;
- case SkXfermode::kIDA_Coeff:
- fsBuilder->codeAppendf(" * (1.0 - %s.a)", dstColorName);
- break;
- default:
- SkFAIL("Unsupported Blend Coeff");
- }
- return true;
- }
-}
-
-//////////////////////////////////////////////////////////////////////////////
-
-void GrGLSLBlend::AppendMode(GrGLSLFragmentBuilder* fsBuilder, const char* srcColor,
- const char* dstColor, const char* outColor,
- SkXfermode::Mode mode) {
-
- SkXfermode::Coeff srcCoeff, dstCoeff;
- if (SkXfermode::ModeAsCoeff(mode, &srcCoeff, &dstCoeff)) {
- fsBuilder->codeAppendf("%s = ", outColor);
- // append src blend
- bool didAppend = append_porterduff_term(fsBuilder, srcCoeff, srcColor, srcColor, dstColor,
- false);
- // append dst blend
- if(!append_porterduff_term(fsBuilder, dstCoeff, dstColor, srcColor, dstColor, didAppend)) {
- fsBuilder->codeAppend("vec4(0, 0, 0, 0)");
- }
- fsBuilder->codeAppend(";");
- } else {
- emit_advanced_xfermode_code(fsBuilder, srcColor, dstColor, outColor, mode);
- }
-}
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