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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SKSL_LAYOUT
#define SKSL_LAYOUT
#include "SkString.h"
#include "SkSLUtil.h"
namespace SkSL {
/**
* Represents a layout block appearing before a variable declaration, as in:
*
* layout (location = 0) int x;
*/
struct Layout {
// These are used by images in GLSL. We only support a subset of what GL supports.
enum class Format {
kUnspecified = -1,
kRGBA32F,
kR32F,
kRGBA16F,
kR16F,
kRGBA8,
kR8,
kRGBA8I,
kR8I,
};
static const char* FormatToStr(Format format) {
switch (format) {
case Format::kUnspecified: return "";
case Format::kRGBA32F: return "rgba32f";
case Format::kR32F: return "r32f";
case Format::kRGBA16F: return "rgba16f";
case Format::kR16F: return "r16f";
case Format::kRGBA8: return "rgba8";
case Format::kR8: return "r8";
case Format::kRGBA8I: return "rgba8i";
case Format::kR8I: return "r8i";
}
SkFAIL("Unexpected format");
return "";
}
static bool ReadFormat(SkString str, Format* format) {
if (str == "rgba32f") {
*format = Format::kRGBA32F;
return true;
} else if (str == "r32f") {
*format = Format::kR32F;
return true;
} else if (str == "rgba16f") {
*format = Format::kRGBA16F;
return true;
} else if (str == "r16f") {
*format = Format::kR16F;
return true;
} else if (str == "rgba8") {
*format = Format::kRGBA8;
return true;
} else if (str == "r8") {
*format = Format::kR8;
return true;
} else if (str == "rgba8i") {
*format = Format::kRGBA8I;
return true;
} else if (str == "r8i") {
*format = Format::kR8I;
return true;
}
return false;
}
Layout(int location, int binding, int index, int set, int builtin, int inputAttachmentIndex,
bool originUpperLeft, bool overrideCoverage, bool blendSupportAllEquations,
Format format, bool pushconstant)
: fLocation(location)
, fBinding(binding)
, fIndex(index)
, fSet(set)
, fBuiltin(builtin)
, fInputAttachmentIndex(inputAttachmentIndex)
, fOriginUpperLeft(originUpperLeft)
, fOverrideCoverage(overrideCoverage)
, fBlendSupportAllEquations(blendSupportAllEquations)
, fFormat(format)
, fPushConstant(pushconstant) {}
Layout()
: fLocation(-1)
, fBinding(-1)
, fIndex(-1)
, fSet(-1)
, fBuiltin(-1)
, fInputAttachmentIndex(-1)
, fOriginUpperLeft(false)
, fOverrideCoverage(false)
, fBlendSupportAllEquations(false)
, fFormat(Format::kUnspecified)
, fPushConstant(false) {}
SkString description() const {
SkString result;
SkString separator;
if (fLocation >= 0) {
result += separator + "location = " + to_string(fLocation);
separator = ", ";
}
if (fBinding >= 0) {
result += separator + "binding = " + to_string(fBinding);
separator = ", ";
}
if (fIndex >= 0) {
result += separator + "index = " + to_string(fIndex);
separator = ", ";
}
if (fSet >= 0) {
result += separator + "set = " + to_string(fSet);
separator = ", ";
}
if (fBuiltin >= 0) {
result += separator + "builtin = " + to_string(fBuiltin);
separator = ", ";
}
if (fInputAttachmentIndex >= 0) {
result += separator + "input_attachment_index = " + to_string(fBuiltin);
separator = ", ";
}
if (fOriginUpperLeft) {
result += separator + "origin_upper_left";
separator = ", ";
}
if (fOverrideCoverage) {
result += separator + "override_coverage";
separator = ", ";
}
if (fBlendSupportAllEquations) {
result += separator + "blend_support_all_equations";
separator = ", ";
}
if (Format::kUnspecified != fFormat) {
result += separator + FormatToStr(fFormat);
separator = ", ";
}
if (fPushConstant) {
result += separator + "push_constant";
separator = ", ";
}
if (result.size() > 0) {
result = "layout (" + result + ")";
}
return result;
}
bool operator==(const Layout& other) const {
return fLocation == other.fLocation &&
fBinding == other.fBinding &&
fIndex == other.fIndex &&
fSet == other.fSet &&
fBuiltin == other.fBuiltin &&
fInputAttachmentIndex == other.fInputAttachmentIndex &&
fOriginUpperLeft == other.fOriginUpperLeft &&
fOverrideCoverage == other.fOverrideCoverage &&
fBlendSupportAllEquations == other.fBlendSupportAllEquations &&
fFormat == other.fFormat;
}
bool operator!=(const Layout& other) const {
return !(*this == other);
}
int fLocation;
int fBinding;
int fIndex;
int fSet;
// builtin comes from SPIR-V and identifies which particular builtin value this object
// represents.
int fBuiltin;
// input_attachment_index comes from Vulkan/SPIR-V to connect a shader variable to the a
// corresponding attachment on the subpass in which the shader is being used.
int fInputAttachmentIndex;
bool fOriginUpperLeft;
bool fOverrideCoverage;
bool fBlendSupportAllEquations;
Format fFormat;
bool fPushConstant;
};
} // namespace
#endif
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