Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #include "WebGLVertexAttribData.h"
       7             : 
       8             : #include "GLContext.h"
       9             : #include "WebGLBuffer.h"
      10             : 
      11             : namespace mozilla {
      12             : 
      13             : static uint8_t
      14           0 : CalcBytesPerVertex(GLenum type, uint8_t size)
      15             : {
      16             :     uint8_t bytesPerType;
      17           0 :     switch (type) {
      18             :     case LOCAL_GL_INT_2_10_10_10_REV:
      19             :     case LOCAL_GL_UNSIGNED_INT_2_10_10_10_REV:
      20           0 :         return 4;
      21             : 
      22             :     case LOCAL_GL_BYTE:
      23             :     case LOCAL_GL_UNSIGNED_BYTE:
      24           0 :         bytesPerType = 1;
      25           0 :         break;
      26             : 
      27             :     case LOCAL_GL_HALF_FLOAT:
      28             :     case LOCAL_GL_SHORT:
      29             :     case LOCAL_GL_UNSIGNED_SHORT:
      30           0 :         bytesPerType = 2;
      31           0 :         break;
      32             : 
      33             :     case LOCAL_GL_FIXED: // GLES 3.0.4 p9: 32-bit signed, with 16 fractional bits.
      34             :     case LOCAL_GL_FLOAT:
      35             :     case LOCAL_GL_INT:
      36             :     case LOCAL_GL_UNSIGNED_INT:
      37           0 :         bytesPerType = 4;
      38           0 :         break;
      39             : 
      40             :     default:
      41           0 :         MOZ_CRASH("Bad `type`.");
      42             :     }
      43             : 
      44           0 :     return bytesPerType * size;
      45             : }
      46             : 
      47             : static GLenum
      48           0 : AttribPointerBaseType(bool integerFunc, GLenum type)
      49             : {
      50           0 :     if (!integerFunc)
      51           0 :         return LOCAL_GL_FLOAT;
      52             : 
      53           0 :     switch (type) {
      54             :     case LOCAL_GL_BYTE:
      55             :     case LOCAL_GL_SHORT:
      56             :     case LOCAL_GL_INT:
      57           0 :         return LOCAL_GL_INT;
      58             : 
      59             :     case LOCAL_GL_UNSIGNED_BYTE:
      60             :     case LOCAL_GL_UNSIGNED_SHORT:
      61             :     case LOCAL_GL_UNSIGNED_INT:
      62           0 :         return LOCAL_GL_UNSIGNED_INT;
      63             : 
      64             :     default:
      65           0 :         MOZ_CRASH();
      66             :     }
      67             : }
      68             : 
      69             : void
      70           0 : WebGLVertexAttribData::VertexAttribPointer(bool integerFunc, WebGLBuffer* buf,
      71             :                                            uint8_t size, GLenum type, bool normalized,
      72             :                                            uint32_t stride, uint64_t byteOffset)
      73             : {
      74           0 :     mIntegerFunc = integerFunc;
      75           0 :     WebGLBuffer::SetSlot(0, buf, &mBuf);
      76           0 :     mType = type;
      77           0 :     mBaseType = AttribPointerBaseType(integerFunc, type);
      78           0 :     mSize = size;
      79           0 :     mBytesPerVertex = CalcBytesPerVertex(mType, mSize);
      80           0 :     mNormalized = normalized;
      81           0 :     mStride = stride;
      82           0 :     mExplicitStride = (mStride ? mStride : mBytesPerVertex);
      83           0 :     mByteOffset = byteOffset;
      84           0 : }
      85             : 
      86             : void
      87           0 : WebGLVertexAttribData::DoVertexAttribPointer(gl::GLContext* gl, GLuint index) const
      88             : {
      89           0 :     if (mIntegerFunc) {
      90           0 :         gl->fVertexAttribIPointer(index, mSize, mType, mStride,
      91           0 :                                   (const void*)mByteOffset);
      92             :     } else {
      93           0 :         gl->fVertexAttribPointer(index, mSize, mType, mNormalized, mStride,
      94           0 :                                  (const void*)mByteOffset);
      95             :     }
      96           0 : }
      97             : 
      98             : } // namespace mozilla