michael@0: /*
michael@0:  * Copyright 2013 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef GrGLVertexArray_DEFINED
michael@0: #define GrGLVertexArray_DEFINED
michael@0: 
michael@0: #include "GrResource.h"
michael@0: #include "GrTypesPriv.h"
michael@0: #include "gl/GrGLDefines.h"
michael@0: #include "gl/GrGLFunctions.h"
michael@0: 
michael@0: #include "SkTArray.h"
michael@0: 
michael@0: class GrGLVertexBuffer;
michael@0: class GrGLIndexBuffer;
michael@0: class GrGpuGL;
michael@0: 
michael@0: struct GrGLAttribLayout {
michael@0:     GrGLint     fCount;
michael@0:     GrGLenum    fType;
michael@0:     GrGLboolean fNormalized;
michael@0: };
michael@0: 
michael@0: static inline const GrGLAttribLayout& GrGLAttribTypeToLayout(GrVertexAttribType type) {
michael@0:     SkASSERT(type >= 0 && type < kGrVertexAttribTypeCount);
michael@0:     static const GrGLAttribLayout kLayouts[kGrVertexAttribTypeCount] = {
michael@0:         {1, GR_GL_FLOAT, false},         // kFloat_GrVertexAttribType
michael@0:         {2, GR_GL_FLOAT, false},         // kVec2f_GrVertexAttribType
michael@0:         {3, GR_GL_FLOAT, false},         // kVec3f_GrVertexAttribType
michael@0:         {4, GR_GL_FLOAT, false},         // kVec4f_GrVertexAttribType
michael@0:         {4, GR_GL_UNSIGNED_BYTE, true},  // kVec4ub_GrVertexAttribType
michael@0:     };
michael@0:     GR_STATIC_ASSERT(0 == kFloat_GrVertexAttribType);
michael@0:     GR_STATIC_ASSERT(1 == kVec2f_GrVertexAttribType);
michael@0:     GR_STATIC_ASSERT(2 == kVec3f_GrVertexAttribType);
michael@0:     GR_STATIC_ASSERT(3 == kVec4f_GrVertexAttribType);
michael@0:     GR_STATIC_ASSERT(4 == kVec4ub_GrVertexAttribType);
michael@0:     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kLayouts) == kGrVertexAttribTypeCount);
michael@0:     return kLayouts[type];
michael@0: }
michael@0: 
michael@0: /**
michael@0:  * This sets and tracks the vertex attribute array state. It is used internally by GrGLVertexArray
michael@0:  * (below) but is separate because it is also used to track the state of vertex array object 0.
michael@0:  */
michael@0: class GrGLAttribArrayState {
michael@0: public:
michael@0:     explicit GrGLAttribArrayState(int arrayCount = 0) {
michael@0:         this->resize(arrayCount);
michael@0:     }
michael@0: 
michael@0:     void resize(int newCount) {
michael@0:         fAttribArrayStates.resize_back(newCount);
michael@0:         for (int i = 0; i < newCount; ++i) {
michael@0:             fAttribArrayStates[i].invalidate();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * This function enables and sets vertex attrib state for the specified attrib index. It is
michael@0:      * assumed that the GrGLAttribArrayState is tracking the state of the currently bound vertex
michael@0:      * array object.
michael@0:      */
michael@0:     void set(const GrGpuGL*,
michael@0:              int index,
michael@0:              GrGLVertexBuffer*,
michael@0:              GrGLint size,
michael@0:              GrGLenum type,
michael@0:              GrGLboolean normalized,
michael@0:              GrGLsizei stride,
michael@0:              GrGLvoid* offset);
michael@0: 
michael@0:     /**
michael@0:      * This function disables vertex attribs not present in the mask. It is assumed that the
michael@0:      * GrGLAttribArrayState is tracking the state of the currently bound vertex array object.
michael@0:      */
michael@0:     void disableUnusedArrays(const GrGpuGL*, uint64_t usedAttribArrayMask);
michael@0: 
michael@0:     void invalidate() {
michael@0:         int count = fAttribArrayStates.count();
michael@0:         for (int i = 0; i < count; ++i) {
michael@0:             fAttribArrayStates[i].invalidate();
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     void notifyVertexBufferDelete(GrGLuint id) {
michael@0:         int count = fAttribArrayStates.count();
michael@0:         for (int i = 0; i < count; ++i) {
michael@0:             if (fAttribArrayStates[i].fAttribPointerIsValid &&
michael@0:                 id == fAttribArrayStates[i].fVertexBufferID) {
michael@0:                 fAttribArrayStates[i].invalidate();
michael@0:             }
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     /**
michael@0:      * The number of attrib arrays that this object is configured to track.
michael@0:      */
michael@0:     int count() const { return fAttribArrayStates.count(); }
michael@0: 
michael@0: private:
michael@0:     /**
michael@0:      * Tracks the state of glVertexAttribArray for an attribute index.
michael@0:      */
michael@0:     struct AttribArrayState {
michael@0:             void invalidate() {
michael@0:                 fEnableIsValid = false;
michael@0:                 fAttribPointerIsValid = false;
michael@0:             }
michael@0: 
michael@0:             bool        fEnableIsValid;
michael@0:             bool        fAttribPointerIsValid;
michael@0:             bool        fEnabled;
michael@0:             GrGLuint    fVertexBufferID;
michael@0:             GrGLint     fSize;
michael@0:             GrGLenum    fType;
michael@0:             GrGLboolean fNormalized;
michael@0:             GrGLsizei   fStride;
michael@0:             GrGLvoid*   fOffset;
michael@0:     };
michael@0: 
michael@0:     SkSTArray<16, AttribArrayState, true> fAttribArrayStates;
michael@0: };
michael@0: 
michael@0: /**
michael@0:  * This class represents an OpenGL vertex array object. It manages the lifetime of the vertex array
michael@0:  * and is used to track the state of the vertex array to avoid redundant GL calls.
michael@0:  */
michael@0: class GrGLVertexArray : public GrResource {
michael@0: public:
michael@0:     GrGLVertexArray(GrGpuGL* gpu, GrGLint id, int attribCount);
michael@0: 
michael@0:     /**
michael@0:      * Binds this vertex array. If the ID has been deleted or abandoned then NULL is returned.
michael@0:      * Otherwise, the GrGLAttribArrayState that is tracking this vertex array's attrib bindings is
michael@0:      * returned.
michael@0:      */
michael@0:     GrGLAttribArrayState* bind();
michael@0: 
michael@0:     /**
michael@0:      * This is a version of the above function that also binds an index buffer to the vertex
michael@0:      * array object.
michael@0:      */
michael@0:     GrGLAttribArrayState* bindWithIndexBuffer(const GrGLIndexBuffer* indexBuffer);
michael@0: 
michael@0:     void notifyIndexBufferDelete(GrGLuint bufferID);
michael@0: 
michael@0:     void notifyVertexBufferDelete(GrGLuint id) {
michael@0:         fAttribArrays.notifyVertexBufferDelete(id);
michael@0:     }
michael@0: 
michael@0:     GrGLuint arrayID() const { return fID; }
michael@0: 
michael@0:     void invalidateCachedState();
michael@0: 
michael@0:     virtual size_t sizeInBytes() const SK_OVERRIDE { return 0; }
michael@0: 
michael@0: protected:
michael@0:     virtual void onAbandon() SK_OVERRIDE;
michael@0: 
michael@0:     virtual void onRelease() SK_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:     GrGLuint                fID;
michael@0:     GrGLAttribArrayState    fAttribArrays;
michael@0:     GrGLuint                fIndexBufferID;
michael@0:     bool                    fIndexBufferIDIsValid;
michael@0: 
michael@0:     typedef GrResource INHERITED;
michael@0: };
michael@0: 
michael@0: #endif