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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 GrGLSL_DEFINED
#define GrGLSL_DEFINED
#include "gl/GrGLInterface.h"
#include "GrColor.h"
#include "GrTypesPriv.h"
class GrGLShaderVar;
class SkString;
// Limited set of GLSL versions we build shaders for. Caller should round
// down the GLSL version to one of these enums.
enum GrGLSLGeneration {
/**
* Desktop GLSL 1.10 and ES2 shading language (based on desktop GLSL 1.20)
*/
k110_GrGLSLGeneration,
/**
* Desktop GLSL 1.30
*/
k130_GrGLSLGeneration,
/**
* Desktop GLSL 1.40
*/
k140_GrGLSLGeneration,
/**
* Desktop GLSL 1.50
*/
k150_GrGLSLGeneration,
};
enum GrSLConstantVec {
kZeros_GrSLConstantVec,
kOnes_GrSLConstantVec,
kNone_GrSLConstantVec,
};
namespace {
static inline int GrSLTypeToVecLength(GrSLType type) {
static const int kVecLengths[] = {
0, // kVoid_GrSLType
1, // kFloat_GrSLType
2, // kVec2f_GrSLType
3, // kVec3f_GrSLType
4, // kVec4f_GrSLType
1, // kMat33f_GrSLType
1, // kMat44f_GrSLType
1, // kSampler2D_GrSLType
};
GrAssert((size_t) type < GR_ARRAY_COUNT(kVecLengths));
return kVecLengths[type];
}
static inline const char* GrGLSLOnesVecf(int count) {
static const char* kONESVEC[] = {"ERROR", "1.0", "vec2(1,1)",
"vec3(1,1,1)", "vec4(1,1,1,1)"};
GrAssert(count >= 1 && count < (int)GR_ARRAY_COUNT(kONESVEC));
return kONESVEC[count];
}
static inline const char* GrGLSLZerosVecf(int count) {
static const char* kZEROSVEC[] = {"ERROR", "0.0", "vec2(0,0)",
"vec3(0,0,0)", "vec4(0,0,0,0)"};
GrAssert(count >= 1 && count < (int)GR_ARRAY_COUNT(kZEROSVEC));
return kZEROSVEC[count];
}
}
/**
* Gets the most recent GLSL Generation compatible with the OpenGL context.
*/
GrGLSLGeneration GrGetGLSLGeneration(GrGLBinding binding,
const GrGLInterface* gl);
/**
* Returns a string to include at the beginning of a shader to declare the GLSL
* version.
*/
const char* GrGetGLSLVersionDecl(GrGLBinding binding,
GrGLSLGeneration v);
/**
* Depending on the GLSL version being emitted there may be an assumed output
* variable from the fragment shader for the color. Otherwise, the shader must
* declare an output variable for the color. If this function returns true:
* * Parameter var's name will be set to nameIfDeclared
* * The variable must be declared in the fragment shader
* * The variable has to be bound as the color output
* (using glBindFragDataLocation)
* If the function returns false:
* * Parameter var's name will be set to the GLSL built-in color output name.
* * Do not declare the variable in the shader.
* * Do not use glBindFragDataLocation to bind the variable
* In either case var is initialized to represent the color output in the
* shader.
*/
bool GrGLSLSetupFSColorOuput(GrGLSLGeneration gen,
const char* nameIfDeclared,
GrGLShaderVar* var);
/**
* Converts a GrSLType to a string containing the name of the equivalent GLSL type.
*/
static const char* GrGLSLTypeString(GrSLType t) {
switch (t) {
case kVoid_GrSLType:
return "void";
case kFloat_GrSLType:
return "float";
case kVec2f_GrSLType:
return "vec2";
case kVec3f_GrSLType:
return "vec3";
case kVec4f_GrSLType:
return "vec4";
case kMat33f_GrSLType:
return "mat3";
case kMat44f_GrSLType:
return "mat4";
case kSampler2D_GrSLType:
return "sampler2D";
default:
GrCrash("Unknown shader var type.");
return ""; // suppress warning
}
}
/** Return the type enum for a vector of floats of length n (1..4),
e.g. 1 -> "float", 2 -> "vec2", ... */
static inline const char* GrGLSLFloatVectorTypeString(int n) {
return GrGLSLTypeString(GrSLFloatVectorType(n));
}
/** Return the GLSL swizzle operator for a homogenous component of a vector
with the given number of coordinates, e.g. 2 -> ".y", 3 -> ".z" */
const char* GrGLSLVectorHomogCoord(int count);
const char* GrGLSLVectorHomogCoord(GrSLType type);
/** Return the GLSL swizzle operator for a nonhomogenous components of a vector
with the given number of coordinates, e.g. 2 -> ".x", 3 -> ".xy" */
const char* GrGLSLVectorNonhomogCoords(int count);
const char* GrGLSLVectorNonhomogCoords(GrSLType type);
/**
* Produces a string that is the result of modulating two inputs. The inputs must be vecN or
* float. The result is always a vecN. The inputs may be expressions, not just identifier names.
* Either can be NULL or "" in which case the default params control whether a vector of ones or
* zeros. It is an error to pass kNone for default<i> if in<i> is NULL or "". Note that when the
* function determines that the result is a zeros or ones vec then any expression represented by
* or in1 will not be emitted (side effects won't occur). The return value indicates whether a
* known zeros or ones vector resulted. The output can be suppressed when known vector is produced
* by passing true for omitIfConstVec.
*/
template <int N>
GrSLConstantVec GrGLSLModulatef(SkString* outAppend,
const char* in0,
const char* in1,
GrSLConstantVec default0 = kOnes_GrSLConstantVec,
GrSLConstantVec default1 = kOnes_GrSLConstantVec,
bool omitIfConstVec = false);
/**
* Produces a string that is the result of adding two inputs. The inputs must be vecN or
* float. The result is always a vecN. The inputs may be expressions, not just identifier names.
* Either can be NULL or "" in which case the default params control whether a vector of ones or
* zeros. It is an error to pass kNone for default<i> if in<i> is NULL or "". Note that when the
* function determines that the result is a zeros or ones vec then any expression represented by
* or in1 will not be emitted (side effects won't occur). The return value indicates whether a
* known zeros or ones vector resulted. The output can be suppressed when known vector is produced
* by passing true for omitIfConstVec.
*/
template <int N>
GrSLConstantVec GrGLSLAddf(SkString* outAppend,
const char* in0,
const char* in1,
GrSLConstantVec default0 = kZeros_GrSLConstantVec,
GrSLConstantVec default1 = kZeros_GrSLConstantVec,
bool omitIfConstVec = false);
/**
* Produces a string that is the result of subtracting two inputs. The inputs must be vecN or
* float. The result is always a vecN. The inputs may be expressions, not just identifier names.
* Either can be NULL or "" in which case the default params control whether a vector of ones or
* zeros. It is an error to pass kNone for default<i> if in<i> is NULL or "". Note that when the
* function determines that the result is a zeros or ones vec then any expression represented by
* or in1 will not be emitted (side effects won't occur). The return value indicates whether a
* known zeros or ones vector resulted. The output can be suppressed when known vector is produced
* by passing true for omitIfConstVec.
*/
template <int N>
GrSLConstantVec GrGLSLSubtractf(SkString* outAppend,
const char* in0,
const char* in1,
GrSLConstantVec default0 = kZeros_GrSLConstantVec,
GrSLConstantVec default1 = kZeros_GrSLConstantVec,
bool omitIfConstVec = false);
/**
* Does an inplace mul, *=, of vec4VarName by mulFactor. If mulFactorDefault is not kNone then
* mulFactor may be either "" or NULL. In this case either nothing will be appended (kOnes) or an
* assignment of vec(0,0,0,0) will be appended (kZeros). The assignment is prepended by tabCnt tabs.
* A semicolon and newline are added after the assignment. (TODO: Remove tabCnt when we auto-insert
* tabs to GrGLEffect-generated lines.) If a zeros vec is assigned then the return value is
* kZeros, otherwise kNone.
*/
GrSLConstantVec GrGLSLMulVarBy4f(SkString* outAppend,
int tabCnt,
const char* vec4VarName,
const char* mulFactor,
GrSLConstantVec mulFactorDefault = kOnes_GrSLConstantVec);
/**
* Given an expression that evaluates to a GLSL vec4, extract a component. If expr is NULL or ""
* the value of defaultExpr is used. It is an error to pass an empty expr and have set defaultExpr
* to kNone. The return value indicates whether the value is known to be 0 or 1. If omitIfConst is
* set then nothing is appended when the return is not kNone.
*/
GrSLConstantVec GrGLSLGetComponent4f(SkString* outAppend,
const char* expr,
GrColorComponentFlags component,
GrSLConstantVec defaultExpr = kNone_GrSLConstantVec,
bool omitIfConst = false);
#include "GrGLSL_impl.h"
#endif
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