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-rw-r--r--dom/canvas/WebGLVertexArrayFake.cpp72
1 files changed, 72 insertions, 0 deletions
diff --git a/dom/canvas/WebGLVertexArrayFake.cpp b/dom/canvas/WebGLVertexArrayFake.cpp
new file mode 100644
index 0000000000..3a498ea209
--- /dev/null
+++ b/dom/canvas/WebGLVertexArrayFake.cpp
@@ -0,0 +1,72 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "WebGLVertexArrayFake.h"
+
+#include "GLContext.h"
+#include "WebGLBuffer.h"
+#include "WebGLContext.h"
+
+namespace mozilla {
+
+static void BindBuffer(gl::GLContext* const gl, const GLenum target,
+ WebGLBuffer* const buffer) {
+ gl->fBindBuffer(target, buffer ? buffer->mGLName : 0);
+}
+
+WebGLVertexArrayFake::WebGLVertexArrayFake(WebGLContext* webgl)
+ : WebGLVertexArray(webgl) {}
+
+void WebGLVertexArray::DoVertexAttrib(const uint32_t index,
+ const uint32_t vertOffset) const {
+ const auto& gl = mContext->gl;
+
+ const bool useDivisor =
+ mContext->IsWebGL2() ||
+ mContext->IsExtensionEnabled(WebGLExtensionID::ANGLE_instanced_arrays);
+
+ const auto& binding = mBindings.at(index);
+ const auto& desc = mDescs.at(index);
+
+ if (binding.layout.isArray) {
+ gl->fEnableVertexAttribArray(index);
+ } else {
+ gl->fDisableVertexAttribArray(index);
+ }
+
+ if (useDivisor) {
+ gl->fVertexAttribDivisor(index, binding.layout.divisor);
+ }
+
+ static_assert(IsBufferTargetLazilyBound(LOCAL_GL_ARRAY_BUFFER));
+ BindBuffer(gl, LOCAL_GL_ARRAY_BUFFER, binding.buffer);
+
+ auto desc2 = desc;
+ if (!binding.layout.divisor) {
+ desc2.byteOffset += binding.layout.byteStride * vertOffset;
+ }
+ DoVertexAttribPointer(*gl, index, desc2);
+
+ BindBuffer(gl, LOCAL_GL_ARRAY_BUFFER, nullptr);
+}
+
+void WebGLVertexArrayFake::BindVertexArray() {
+ // Go through and re-bind all buffers and setup all
+ // vertex attribute pointers
+ const auto& gl = mContext->gl;
+
+ mContext->mBoundVertexArray = this;
+
+ static_assert(IsBufferTargetLazilyBound(LOCAL_GL_ARRAY_BUFFER));
+ static_assert(!IsBufferTargetLazilyBound(LOCAL_GL_ELEMENT_ARRAY_BUFFER));
+
+ BindBuffer(gl, LOCAL_GL_ELEMENT_ARRAY_BUFFER, mElementArrayBuffer);
+
+ for (const auto i : IntegerRange(mContext->MaxVertexAttribs())) {
+ DoVertexAttrib(i);
+ }
+}
+
+} // namespace mozilla