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