1 files changed, 98 insertions, 0 deletions
diff --git a/dom/canvas/WebGLVertexAttribData.cpp b/dom/canvas/WebGLVertexAttribData.cpp
new file mode 100644
index 000000000..b5aee18e5
--- /dev/null
+++ b/dom/canvas/WebGLVertexAttribData.cpp
@@ -0,0 +1,98 @@
+/* -*- 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