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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrGLSLShaderVar_DEFINED
#define GrGLSLShaderVar_DEFINED
#include "GrShaderVar.h"
#include "../glsl/GrGLSL.h"
#include "../glsl/GrGLSLCaps.h"
#define USE_UNIFORM_FLOAT_ARRAYS true
/**
* Represents a variable in a shader
*/
class GrGLSLShaderVar : public GrShaderVar {
public:
/**
* Defaults to a float with no precision specifier
*/
GrGLSLShaderVar()
: GrShaderVar()
, fUseUniformFloatArrays(USE_UNIFORM_FLOAT_ARRAYS) {
}
GrGLSLShaderVar(const char* name, GrSLType type, int arrayCount = kNonArray,
GrSLPrecision precision = kDefault_GrSLPrecision)
: GrShaderVar(name, type, arrayCount, precision)
, fUseUniformFloatArrays(USE_UNIFORM_FLOAT_ARRAYS) {
SkASSERT(kVoid_GrSLType != type);
fUseUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS;
}
GrGLSLShaderVar(const char* name, GrSLType type, TypeModifier typeModifier,
int arrayCount = kNonArray, GrSLPrecision precision = kDefault_GrSLPrecision)
: GrShaderVar(name, type, typeModifier, arrayCount, precision)
, fUseUniformFloatArrays(USE_UNIFORM_FLOAT_ARRAYS) {
SkASSERT(kVoid_GrSLType != type);
}
GrGLSLShaderVar(const GrShaderVar& var)
: GrShaderVar(var)
, fUseUniformFloatArrays(USE_UNIFORM_FLOAT_ARRAYS) {
SkASSERT(kVoid_GrSLType != var.getType());
}
GrGLSLShaderVar(const GrGLSLShaderVar& var)
: GrShaderVar(var.c_str(), var.getType(), var.getTypeModifier(),
var.getArrayCount(), var.getPrecision())
, fUseUniformFloatArrays(var.fUseUniformFloatArrays)
, fLayoutQualifier(var.fLayoutQualifier)
, fExtraModifiers(var.fExtraModifiers) {
SkASSERT(kVoid_GrSLType != var.getType());
}
/**
* Values for array count that have special meaning. We allow 1-sized arrays.
*/
enum {
kNonArray = 0, // not an array
kUnsizedArray = -1, // an unsized array (declared with [])
};
/**
* Sets as a non-array.
*/
void set(GrSLType type,
TypeModifier typeModifier,
const SkString& name,
GrSLPrecision precision = kDefault_GrSLPrecision,
const char* layoutQualifier = nullptr,
const char* extraModifiers = nullptr,
bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
SkASSERT(kVoid_GrSLType != type);
SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeAcceptsPrecision(type));
INHERITED::set(type, name, typeModifier, precision);
fLayoutQualifier = layoutQualifier;
if (extraModifiers) {
fExtraModifiers.printf("%s ", extraModifiers);
}
fUseUniformFloatArrays = useUniformFloatArrays;
}
/**
* Sets as a non-array.
*/
void set(GrSLType type,
TypeModifier typeModifier,
const char* name,
GrSLPrecision precision = kDefault_GrSLPrecision,
const char* layoutQualifier = nullptr,
const char* extraModifiers = nullptr,
bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
SkASSERT(kVoid_GrSLType != type);
SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeAcceptsPrecision(type));
INHERITED::set(type, name, typeModifier, precision);
fLayoutQualifier = layoutQualifier;
if (extraModifiers) {
fExtraModifiers.printf("%s ", extraModifiers);
}
fUseUniformFloatArrays = useUniformFloatArrays;
}
/**
* Set all var options
*/
void set(GrSLType type,
TypeModifier typeModifier,
const SkString& name,
int count,
GrSLPrecision precision = kDefault_GrSLPrecision,
const char* layoutQualifier = nullptr,
const char* extraModifiers = nullptr,
bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
SkASSERT(kVoid_GrSLType != type);
SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeAcceptsPrecision(type));
INHERITED::set(type, name, typeModifier, precision, count);
fLayoutQualifier = layoutQualifier;
if (extraModifiers) {
fExtraModifiers.printf("%s ", extraModifiers);
}
fUseUniformFloatArrays = useUniformFloatArrays;
}
/**
* Set all var options
*/
void set(GrSLType type,
TypeModifier typeModifier,
const char* name,
int count,
GrSLPrecision precision = kDefault_GrSLPrecision,
const char* layoutQualifier = nullptr,
const char* extraModifiers = nullptr,
bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
SkASSERT(kVoid_GrSLType != type);
SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeAcceptsPrecision(type));
INHERITED::set(type, name, typeModifier, precision, count);
fLayoutQualifier = layoutQualifier;
if (extraModifiers) {
fExtraModifiers.printf("%s ", extraModifiers);
}
fUseUniformFloatArrays = useUniformFloatArrays;
}
/**
* Set the layout qualifier
*/
void setLayoutQualifier(const char* layoutQualifier) {
fLayoutQualifier = layoutQualifier;
}
void addModifier(const char* modifier) {
if (modifier) {
fExtraModifiers.appendf("%s ", modifier);
}
}
/**
* Write a declaration of this variable to out.
*/
void appendDecl(const GrGLSLCaps* glslCaps, SkString* out) const {
SkASSERT(kDefault_GrSLPrecision == fPrecision || GrSLTypeAcceptsPrecision(fType));
if (!fLayoutQualifier.isEmpty()) {
out->appendf("layout(%s) ", fLayoutQualifier.c_str());
}
out->append(fExtraModifiers);
if (this->getTypeModifier() != kNone_TypeModifier) {
out->append(TypeModifierString(glslCaps, this->getTypeModifier()));
out->append(" ");
}
GrSLType effectiveType = this->getType();
if (glslCaps->usesPrecisionModifiers() && GrSLTypeAcceptsPrecision(effectiveType)) {
// Desktop GLSL has added precision qualifiers but they don't do anything.
out->appendf("%s ", GrGLSLPrecisionString(fPrecision));
}
if (this->isArray()) {
if (this->isUnsizedArray()) {
out->appendf("%s %s[]",
GrGLSLTypeString(effectiveType),
this->getName().c_str());
} else {
SkASSERT(this->getArrayCount() > 0);
out->appendf("%s %s[%d]",
GrGLSLTypeString(effectiveType),
this->getName().c_str(),
this->getArrayCount());
}
} else {
out->appendf("%s %s",
GrGLSLTypeString(effectiveType),
this->getName().c_str());
}
}
void appendArrayAccess(int index, SkString* out) const {
out->appendf("%s[%d]%s",
this->getName().c_str(),
index,
fUseUniformFloatArrays ? "" : ".x");
}
void appendArrayAccess(const char* indexName, SkString* out) const {
out->appendf("%s[%s]%s",
this->getName().c_str(),
indexName,
fUseUniformFloatArrays ? "" : ".x");
}
private:
static const char* TypeModifierString(const GrGLSLCaps* glslCaps, TypeModifier t) {
switch (t) {
case kNone_TypeModifier:
return "";
case kAttribute_TypeModifier: // fall through
case kVaryingIn_TypeModifier: // fall through
case kIn_TypeModifier:
return "in";
case kInOut_TypeModifier:
return "inout";
case kVaryingOut_TypeModifier: // fall through
case kOut_TypeModifier:
return "out";
case kUniform_TypeModifier:
return "uniform";
default:
SkFAIL("Unknown shader variable type modifier.");
return ""; // suppress warning
}
}
/// Work around driver bugs on some hardware that don't correctly
/// support uniform float []
bool fUseUniformFloatArrays;
SkString fLayoutQualifier;
SkString fExtraModifiers;
typedef GrShaderVar INHERITED;
};
#endif
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