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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 "GrTypesPriv.h"
     12 #include "gl/GrGLDefines.h"
     13 #include "gl/GrGLFunctions.h"
     14 #include "SkTArray.h"
     15 
     16 class GrGLVertexBuffer;
     17 class GrGLIndexBuffer;
     18 class GrGLGpu;
     19 
     20 struct GrGLAttribLayout {
     21     GrGLint     fCount;
     22     GrGLenum    fType;
     23     GrGLboolean fNormalized;
     24 };
     25 
     26 static inline const GrGLAttribLayout& GrGLAttribTypeToLayout(GrVertexAttribType type) {
     27     SkASSERT(type >= 0 && type < kGrVertexAttribTypeCount);
     28     static const GrGLAttribLayout kLayouts[kGrVertexAttribTypeCount] = {
     29         {1, GR_GL_FLOAT, false},         // kFloat_GrVertexAttribType
     30         {2, GR_GL_FLOAT, false},         // kVec2f_GrVertexAttribType
     31         {3, GR_GL_FLOAT, false},         // kVec3f_GrVertexAttribType
     32         {4, GR_GL_FLOAT, false},         // kVec4f_GrVertexAttribType
     33         {1, GR_GL_UNSIGNED_BYTE, true},  // kUByte_GrVertexAttribType
     34         {4, GR_GL_UNSIGNED_BYTE, true},  // kVec4ub_GrVertexAttribType
     35         {2, GR_GL_SHORT, false},         // kVec2s_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 == kUByte_GrVertexAttribType);
     42     GR_STATIC_ASSERT(5 == kVec4ub_GrVertexAttribType);
     43     GR_STATIC_ASSERT(6 == kVec2s_GrVertexAttribType);
     44     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kLayouts) == kGrVertexAttribTypeCount);
     45     return kLayouts[type];
     46 }
     47 
     48 /**
     49  * This sets and tracks the vertex attribute array state. It is used internally by GrGLVertexArray
     50  * (below) but is separate because it is also used to track the state of vertex array object 0.
     51  */
     52 class GrGLAttribArrayState {
     53 public:
     54     explicit GrGLAttribArrayState(int arrayCount = 0) {
     55         this->resize(arrayCount);
     56     }
     57 
     58     void resize(int newCount) {
     59         fAttribArrayStates.resize_back(newCount);
     60         for (int i = 0; i < newCount; ++i) {
     61             fAttribArrayStates[i].invalidate();
     62         }
     63     }
     64 
     65     /**
     66      * This function enables and sets vertex attrib state for the specified attrib index. It is
     67      * assumed that the GrGLAttribArrayState is tracking the state of the currently bound vertex
     68      * array object.
     69      */
     70     void set(const GrGLGpu*,
     71              int index,
     72              GrGLVertexBuffer*,
     73              GrGLint size,
     74              GrGLenum type,
     75              GrGLboolean normalized,
     76              GrGLsizei stride,
     77              GrGLvoid* offset);
     78 
     79     /**
     80      * This function disables vertex attribs not present in the mask. It is assumed that the
     81      * GrGLAttribArrayState is tracking the state of the currently bound vertex array object.
     82      */
     83     void disableUnusedArrays(const GrGLGpu*, uint64_t usedAttribArrayMask);
     84 
     85     void invalidate() {
     86         int count = fAttribArrayStates.count();
     87         for (int i = 0; i < count; ++i) {
     88             fAttribArrayStates[i].invalidate();
     89         }
     90     }
     91 
     92     void notifyVertexBufferDelete(GrGLuint id) {
     93         int count = fAttribArrayStates.count();
     94         for (int i = 0; i < count; ++i) {
     95             if (fAttribArrayStates[i].fAttribPointerIsValid &&
     96                 id == fAttribArrayStates[i].fVertexBufferID) {
     97                 fAttribArrayStates[i].invalidate();
     98             }
     99         }
    100     }
    101 
    102     /**
    103      * The number of attrib arrays that this object is configured to track.
    104      */
    105     int count() const { return fAttribArrayStates.count(); }
    106 
    107 private:
    108     /**
    109      * Tracks the state of glVertexAttribArray for an attribute index.
    110      */
    111     struct AttribArrayState {
    112             void invalidate() {
    113                 fEnableIsValid = false;
    114                 fAttribPointerIsValid = false;
    115             }
    116 
    117             bool        fEnableIsValid;
    118             bool        fAttribPointerIsValid;
    119             bool        fEnabled;
    120             GrGLuint    fVertexBufferID;
    121             GrGLint     fSize;
    122             GrGLenum    fType;
    123             GrGLboolean fNormalized;
    124             GrGLsizei   fStride;
    125             GrGLvoid*   fOffset;
    126     };
    127 
    128     SkSTArray<16, AttribArrayState, true> fAttribArrayStates;
    129 };
    130 
    131 /**
    132  * This class represents an OpenGL vertex array object. It manages the lifetime of the vertex array
    133  * and is used to track the state of the vertex array to avoid redundant GL calls.
    134  */
    135 class GrGLVertexArray {
    136 public:
    137     GrGLVertexArray(GrGLint id, int attribCount);
    138 
    139     /**
    140      * Binds this vertex array. If the ID has been deleted or abandoned then NULL is returned.
    141      * Otherwise, the GrGLAttribArrayState that is tracking this vertex array's attrib bindings is
    142      * returned.
    143      */
    144     GrGLAttribArrayState* bind(GrGLGpu*);
    145 
    146     /**
    147      * This is a version of the above function that also binds an index buffer to the vertex
    148      * array object.
    149      */
    150     GrGLAttribArrayState* bindWithIndexBuffer(GrGLGpu* gpu, const GrGLIndexBuffer*);
    151 
    152     void notifyIndexBufferDelete(GrGLuint bufferID);
    153 
    154     void notifyVertexBufferDelete(GrGLuint id) {
    155         fAttribArrays.notifyVertexBufferDelete(id);
    156     }
    157 
    158     GrGLuint arrayID() const { return fID; }
    159 
    160     void invalidateCachedState();
    161 
    162 private:
    163     GrGLuint                fID;
    164     GrGLAttribArrayState    fAttribArrays;
    165     GrGLuint                fIndexBufferID;
    166     bool                    fIndexBufferIDIsValid;
    167 };
    168 
    169 #endif
    170