Move GLSL-specific routines/classes to separate glsl directory

src/gpu/glsl/GrGLSLCaps.h

+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+#ifndef GrGLSLCaps_DEFINED
+#define GrGLSLCaps_DEFINED
+
+#include "GrCaps.h"
+#include "GrGLSL.h"
+
+class GrGLSLCaps : public GrShaderCaps {
+public:
+    SK_DECLARE_INST_COUNT(GrGLSLCaps)
+
+    /**
+    * Indicates how GLSL must interact with advanced blend equations. The KHR extension requires
+    * special layout qualifiers in the fragment shader.
+    */
+    enum AdvBlendEqInteraction {
+        kNotSupported_AdvBlendEqInteraction,     //<! No _blend_equation_advanced extension
+        kAutomatic_AdvBlendEqInteraction,        //<! No interaction required
+        kGeneralEnable_AdvBlendEqInteraction,    //<! layout(blend_support_all_equations) out
+        kSpecificEnables_AdvBlendEqInteraction,  //<! Specific layout qualifiers per equation
+
+        kLast_AdvBlendEqInteraction = kSpecificEnables_AdvBlendEqInteraction
+    };
+
+    /**
+     * Initializes the GrGLSLCaps to a default set of features
+     */
+    GrGLSLCaps(const GrContextOptions&);
+
+    /**
+     * Some helper functions for encapsulating various extensions to read FB Buffer on openglES
+     *
+     * TODO(joshualitt) On desktop opengl 4.2+ we can achieve something similar to this effect
+     */
+    bool fbFetchSupport() const { return fFBFetchSupport; }
+
+    bool fbFetchNeedsCustomOutput() const { return fFBFetchNeedsCustomOutput; }
+
+    bool bindlessTextureSupport() const { return fBindlessTextureSupport; }
+
+    const char* fbFetchColorName() const { return fFBFetchColorName; }
+
+    const char* fbFetchExtensionString() const { return fFBFetchExtensionString; }
+
+    bool dropsTileOnZeroDivide() const { return fDropsTileOnZeroDivide; }
+
+    AdvBlendEqInteraction advBlendEqInteraction() const { return fAdvBlendEqInteraction; }
+
+    bool mustEnableAdvBlendEqs() const {
+        return fAdvBlendEqInteraction >= kGeneralEnable_AdvBlendEqInteraction;
+    }
+
+    bool mustEnableSpecificAdvBlendEqs() const {
+        return fAdvBlendEqInteraction == kSpecificEnables_AdvBlendEqInteraction;
+    }
+    
+    bool mustDeclareFragmentShaderOutput() const {
+        return fGLSLGeneration > k110_GrGLSLGeneration;
+    }
+
+    GrGLSLGeneration generation() const { return fGLSLGeneration; }
+
+    /**
+    * Returns a string containing the caps info.
+    */
+    SkString dump() const override;
+
+private:
+    GrGLSLGeneration fGLSLGeneration;
+    
+    bool fDropsTileOnZeroDivide : 1;
+    bool fFBFetchSupport : 1;
+    bool fFBFetchNeedsCustomOutput : 1;
+    bool fBindlessTextureSupport : 1;
+
+    const char* fFBFetchColorName;
+    const char* fFBFetchExtensionString;
+
+    AdvBlendEqInteraction fAdvBlendEqInteraction;
+
+    friend class GrGLCaps;  // For initialization.
+
+    typedef GrShaderCaps INHERITED;
+};
+
+
+#endif