Move GrGLShaderVar to GrGLSL

src/gpu/gl/GrGLShaderVar.h

-/*
- * 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 GrGLShaderVar_DEFINED
-#define GrGLShaderVar_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 GrGLShaderVar : public GrShaderVar {
-public:
-    /**
-     * See GL_ARB_fragment_coord_conventions.
-     */
-    enum Origin {
-        kDefault_Origin,        // when set to kDefault the origin field is ignored.
-        kUpperLeft_Origin,      // only used to declare vec4 in gl_FragCoord.
-    };
-
-    /**
-     * Defaults to a float with no precision specifier
-     */
-    GrGLShaderVar()
-        : GrShaderVar()
-        , fOrigin(kDefault_Origin)
-        , fUseUniformFloatArrays(USE_UNIFORM_FLOAT_ARRAYS) {
-    }
-
-    GrGLShaderVar(const char* name, GrSLType type, int arrayCount = kNonArray,
-                  GrSLPrecision precision = kDefault_GrSLPrecision)
-        : GrShaderVar(name, type, arrayCount, precision)
-        , fOrigin(kDefault_Origin)
-        , fUseUniformFloatArrays(USE_UNIFORM_FLOAT_ARRAYS) {
-        SkASSERT(kVoid_GrSLType != type);
-        fOrigin = kDefault_Origin;
-        fUseUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS;
-    }
-
-    GrGLShaderVar(const char* name, GrSLType type, TypeModifier typeModifier,
-                  int arrayCount = kNonArray, GrSLPrecision precision = kDefault_GrSLPrecision)
-        : GrShaderVar(name, type, typeModifier, arrayCount, precision)
-        , fOrigin(kDefault_Origin)
-        , fUseUniformFloatArrays(USE_UNIFORM_FLOAT_ARRAYS) {
-        SkASSERT(kVoid_GrSLType != type);
-    }
-
-    GrGLShaderVar(const GrShaderVar& var)
-        : GrShaderVar(var)
-        , fOrigin(kDefault_Origin)
-        , fUseUniformFloatArrays(USE_UNIFORM_FLOAT_ARRAYS) {
-        SkASSERT(kVoid_GrSLType != var.getType());
-    }
-
-    GrGLShaderVar(const GrGLShaderVar& var)
-        : GrShaderVar(var.c_str(), var.getType(), var.getTypeModifier(),
-                      var.getArrayCount(), var.getPrecision())
-        , fOrigin(var.fOrigin)
-        , fUseUniformFloatArrays(var.fUseUniformFloatArrays) {
-        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,
-             Origin origin = kDefault_Origin,
-             bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
-        SkASSERT(kVoid_GrSLType != type);
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsFloatType(type));
-        INHERITED::set(type, name, typeModifier, precision);
-        fOrigin = origin;
-        fUseUniformFloatArrays = useUniformFloatArrays;
-    }
-
-    /**
-     * Sets as a non-array.
-     */
-    void set(GrSLType type,
-             TypeModifier typeModifier,
-             const char* name,
-             GrSLPrecision precision = kDefault_GrSLPrecision,
-             Origin origin = kDefault_Origin,
-             bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
-        SkASSERT(kVoid_GrSLType != type);
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsFloatType(type));
-        INHERITED::set(type, name, typeModifier, precision);
-        fOrigin = origin;
-        fUseUniformFloatArrays = useUniformFloatArrays;
-    }
-
-    /**
-     * Set all var options
-     */
-    void set(GrSLType type,
-             TypeModifier typeModifier,
-             const SkString& name,
-             int count,
-             GrSLPrecision precision = kDefault_GrSLPrecision,
-             Origin origin = kDefault_Origin,
-             bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
-        SkASSERT(kVoid_GrSLType != type);
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsFloatType(type));
-        INHERITED::set(type, name, typeModifier, precision, count);
-        fOrigin = origin;
-        fUseUniformFloatArrays = useUniformFloatArrays;
-    }
-
-    /**
-     * Set all var options
-     */
-    void set(GrSLType type,
-             TypeModifier typeModifier,
-             const char* name,
-             int count,
-             GrSLPrecision precision = kDefault_GrSLPrecision,
-             Origin origin = kDefault_Origin,
-             bool useUniformFloatArrays = USE_UNIFORM_FLOAT_ARRAYS) {
-        SkASSERT(kVoid_GrSLType != type);
-        SkASSERT(kDefault_GrSLPrecision == precision || GrSLTypeIsFloatType(type));
-        INHERITED::set(type, name, typeModifier, precision, count);
-        fOrigin = origin;
-        fUseUniformFloatArrays = useUniformFloatArrays;
-    }
-
-    /**
-     * Get the origin of the var
-     */
-    Origin getOrigin() const { return fOrigin; }
-
-    /**
-     * Set the origin of the var
-     */
-    void setOrigin(Origin origin) { fOrigin = origin; }
-
-    /**
-     * Write a declaration of this variable to out.
-     */
-    void appendDecl(const GrGLSLCaps* glslCaps, SkString* out) const {
-        SkASSERT(kDefault_GrSLPrecision == fPrecision || GrSLTypeIsFloatType(fType));
-        if (kUpperLeft_Origin == fOrigin) {
-            // this is the only place where we specify a layout modifier. If we use other layout
-            // modifiers in the future then they should be placed in a list.
-            out->append("layout(origin_upper_left) ");
-        }
-        if (this->getTypeModifier() != kNone_TypeModifier) {
-           out->append(TypeModifierString(glslCaps, this->getTypeModifier()));
-           out->append(" ");
-        }
-        out->append(PrecisionString(glslCaps, fPrecision));
-        GrSLType effectiveType = this->getType();
-        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");
-    }
-
-    static const char* PrecisionString(const GrGLSLCaps* glslCaps, GrSLPrecision p) {
-        // Desktop GLSL has added precision qualifiers but they don't do anything.
-        if (glslCaps->usesPrecisionModifiers()) {
-            switch (p) {
-                case kLow_GrSLPrecision:
-                    return "lowp ";
-                case kMedium_GrSLPrecision:
-                    return "mediump ";
-                case kHigh_GrSLPrecision:
-                    return "highp ";
-                default:
-                    SkFAIL("Unexpected precision type.");
-            }
-        }
-        return "";
-    }
-
-private:
-    static const char* TypeModifierString(const GrGLSLCaps* glslCaps, TypeModifier t) {
-        GrGLSLGeneration gen = glslCaps->generation();
-        switch (t) {
-            case kNone_TypeModifier:
-                return "";
-            case kIn_TypeModifier:
-                return "in";
-            case kInOut_TypeModifier:
-                return "inout";
-            case kOut_TypeModifier:
-                return "out";
-            case kUniform_TypeModifier:
-                return "uniform";
-            case kAttribute_TypeModifier:
-                return k110_GrGLSLGeneration == gen ? "attribute" : "in";
-            case kVaryingIn_TypeModifier:
-                return k110_GrGLSLGeneration == gen ? "varying" : "in";
-            case kVaryingOut_TypeModifier:
-                return k110_GrGLSLGeneration == gen ? "varying" : "out";
-            default:
-                SkFAIL("Unknown shader variable type modifier.");
-                return ""; // suppress warning
-        }
-    }
-
-    Origin          fOrigin;
-    /// Work around driver bugs on some hardware that don't correctly
-    /// support uniform float []
-    bool            fUseUniformFloatArrays;
-
-    typedef GrShaderVar INHERITED;
-};
-
-#endif