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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WebGLVertexAttribData.h"
#include "GLContext.h"
#include "WebGLBuffer.h"
namespace mozilla {
static uint8_t
CalcBytesPerVertex(GLenum type, uint8_t size)
{
uint8_t bytesPerType;
switch (type) {
case LOCAL_GL_INT_2_10_10_10_REV:
case LOCAL_GL_UNSIGNED_INT_2_10_10_10_REV:
return 4;
case LOCAL_GL_BYTE:
case LOCAL_GL_UNSIGNED_BYTE:
bytesPerType = 1;
break;
case LOCAL_GL_HALF_FLOAT:
case LOCAL_GL_SHORT:
case LOCAL_GL_UNSIGNED_SHORT:
bytesPerType = 2;
break;
case LOCAL_GL_FIXED: // GLES 3.0.4 p9: 32-bit signed, with 16 fractional bits.
case LOCAL_GL_FLOAT:
case LOCAL_GL_INT:
case LOCAL_GL_UNSIGNED_INT:
bytesPerType = 4;
break;
default:
MOZ_CRASH("Bad `type`.");
}
return bytesPerType * size;
}
static GLenum
AttribPointerBaseType(bool integerFunc, GLenum type)
{
if (!integerFunc)
return LOCAL_GL_FLOAT;
switch (type) {
case LOCAL_GL_BYTE:
case LOCAL_GL_SHORT:
case LOCAL_GL_INT:
return LOCAL_GL_INT;
case LOCAL_GL_UNSIGNED_BYTE:
case LOCAL_GL_UNSIGNED_SHORT:
case LOCAL_GL_UNSIGNED_INT:
return LOCAL_GL_UNSIGNED_INT;
default:
MOZ_CRASH();
}
}
void
WebGLVertexAttribData::VertexAttribPointer(bool integerFunc, WebGLBuffer* buf,
uint8_t size, GLenum type, bool normalized,
uint32_t stride, uint64_t byteOffset)
{
mIntegerFunc = integerFunc;
WebGLBuffer::SetSlot(0, buf, &mBuf);
mType = type;
mBaseType = AttribPointerBaseType(integerFunc, type);
mSize = size;
mBytesPerVertex = CalcBytesPerVertex(mType, mSize);
mNormalized = normalized;
mStride = stride;
mExplicitStride = (mStride ? mStride : mBytesPerVertex);
mByteOffset = byteOffset;
}
void
WebGLVertexAttribData::DoVertexAttribPointer(gl::GLContext* gl, GLuint index) const
{
if (mIntegerFunc) {
gl->fVertexAttribIPointer(index, mSize, mType, mStride,
(const void*)mByteOffset);
} else {
gl->fVertexAttribPointer(index, mSize, mType, mNormalized, mStride,
(const void*)mByteOffset);
}
}
} // namespace mozilla
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