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      1 /*
      2  * Copyright 2013 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef GrGLVertexArray_DEFINED
      9 #define GrGLVertexArray_DEFINED
     10 
     11 #include "GrResource.h"
     12 #include "GrTypesPriv.h"
     13 #include "gl/GrGLDefines.h"
     14 #include "gl/GrGLFunctions.h"
     15 
     16 #include "SkTArray.h"
     17 
     18 class GrGLVertexBuffer;
     19 class GrGLIndexBuffer;
     20 class GrGpuGL;
     21 
     22 struct GrGLAttribLayout {
     23     GrGLint     fCount;
     24     GrGLenum    fType;
     25     GrGLboolean fNormalized;
     26 };
     27 
     28 static inline const GrGLAttribLayout& GrGLAttribTypeToLayout(GrVertexAttribType type) {
     29     GrAssert(type >= 0 && type < kGrVertexAttribTypeCount);
     30     static const GrGLAttribLayout kLayouts[kGrVertexAttribTypeCount] = {
     31         {1, GR_GL_FLOAT, false},         // kFloat_GrVertexAttribType
     32         {2, GR_GL_FLOAT, false},         // kVec2f_GrVertexAttribType
     33         {3, GR_GL_FLOAT, false},         // kVec3f_GrVertexAttribType
     34         {4, GR_GL_FLOAT, false},         // kVec4f_GrVertexAttribType
     35         {4, GR_GL_UNSIGNED_BYTE, true},  // kVec4ub_GrVertexAttribType
     36     };
     37     GR_STATIC_ASSERT(0 == kFloat_GrVertexAttribType);
     38     GR_STATIC_ASSERT(1 == kVec2f_GrVertexAttribType);
     39     GR_STATIC_ASSERT(2 == kVec3f_GrVertexAttribType);
     40     GR_STATIC_ASSERT(3 == kVec4f_GrVertexAttribType);
     41     GR_STATIC_ASSERT(4 == kVec4ub_GrVertexAttribType);
     42     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kLayouts) == kGrVertexAttribTypeCount);
     43     return kLayouts[type];
     44 }
     45 
     46 /**
     47  * This sets and tracks the vertex attribute array state. It is used internally by GrGLVertexArray
     48  * (below) but is separate because it is also used to track the state of vertex array object 0.
     49  */
     50 class GrGLAttribArrayState {
     51 public:
     52     explicit GrGLAttribArrayState(int arrayCount = 0) { this->resize(arrayCount); }
     53 
     54     void resize(int newCount) {
     55         fAttribArrayStates.resize_back(newCount);
     56         for (int i = 0; i < newCount; ++i) {
     57             fAttribArrayStates[i].invalidate();
     58         }
     59     }
     60 
     61     /**
     62      * This function enables and sets vertex attrib state for the specified attrib index. It is
     63      * assumed that the GrGLAttribArrayState is tracking the state of the currently bound vertex
     64      * array object.
     65      */
     66     void set(const GrGpuGL*,
     67              int index,
     68              GrGLVertexBuffer*,
     69              GrGLint size,
     70              GrGLenum type,
     71              GrGLboolean normalized,
     72              GrGLsizei stride,
     73              GrGLvoid* offset);
     74 
     75     /**
     76      * This function disables vertex attribs not present in the mask. It is assumed that the
     77      * GrGLAttribArrayState is tracking the state of the currently bound vertex array object.
     78      */
     79     void disableUnusedAttribArrays(const GrGpuGL*, uint64_t usedAttribArrayMask);
     80 
     81     void invalidate() {
     82         int count = fAttribArrayStates.count();
     83         for (int i = 0; i < count; ++i) {
     84             fAttribArrayStates[i].invalidate();
     85         }
     86     }
     87 
     88     void notifyVertexBufferDelete(GrGLuint id) {
     89         int count = fAttribArrayStates.count();
     90         for (int i = 0; i < count; ++i) {
     91             if (fAttribArrayStates[i].fAttribPointerIsValid &&
     92                 id == fAttribArrayStates[i].fVertexBufferID) {
     93                 fAttribArrayStates[i].invalidate();
     94             }
     95         }
     96     }
     97 
     98     /**
     99      * The number of attrib arrays that this object is configured to track.
    100      */
    101     int count() const { return fAttribArrayStates.count(); }
    102 
    103 private:
    104     /**
    105      * Tracks the state of glVertexAttribArray for an attribute index.
    106      */
    107     struct AttribArrayState {
    108             void invalidate() {
    109                 fEnableIsValid = false;
    110                 fAttribPointerIsValid = false;
    111             }
    112 
    113             bool        fEnableIsValid;
    114             bool        fAttribPointerIsValid;
    115             bool        fEnabled;
    116             GrGLuint    fVertexBufferID;
    117             GrGLint     fSize;
    118             GrGLenum    fType;
    119             GrGLboolean fNormalized;
    120             GrGLsizei   fStride;
    121             GrGLvoid*   fOffset;
    122     };
    123 
    124     SkSTArray<16, AttribArrayState, true> fAttribArrayStates;
    125 };
    126 
    127 /**
    128  * This class represents an OpenGL vertex array object. It manages the lifetime of the vertex array
    129  * and is used to track the state of the vertex array to avoid redundant GL calls.
    130  */
    131 class GrGLVertexArray : public GrResource {
    132 public:
    133     GrGLVertexArray(GrGpuGL* gpu, GrGLint id, int attribCount);
    134 
    135     /**
    136      * Binds this vertex array. If the ID has been deleted or abandoned then NULL is returned.
    137      * Otherwise, the GrGLAttribArrayState that is tracking this vertex array's attrib bindings is
    138      * returned.
    139      */
    140     GrGLAttribArrayState* bind();
    141 
    142     /**
    143      * This is a version of the above function that also binds an index buffer to the vertex
    144      * array object.
    145      */
    146     GrGLAttribArrayState* bindWithIndexBuffer(const GrGLIndexBuffer* indexBuffer);
    147 
    148     void notifyIndexBufferDelete(GrGLuint bufferID);
    149 
    150     void notifyVertexBufferDelete(GrGLuint id) {
    151         fAttribArrays.notifyVertexBufferDelete(id);
    152     }
    153 
    154     GrGLuint arrayID() const { return fID; }
    155 
    156     void invalidateCachedState();
    157 
    158     virtual size_t sizeInBytes() const SK_OVERRIDE { return 0; }
    159 
    160 protected:
    161     virtual void onAbandon() SK_OVERRIDE;
    162 
    163     virtual void onRelease() SK_OVERRIDE;
    164 
    165 private:
    166     GrGLuint                fID;
    167     GrGLAttribArrayState    fAttribArrays;
    168     GrGLuint                fIndexBufferID;
    169     bool                    fIndexBufferIDIsValid;
    170 
    171     typedef GrResource INHERITED;
    172 };
    173 
    174 #endif
    175