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-rw-r--r--dom/canvas/WebGL2ContextRenderbuffers.cpp74
1 files changed, 74 insertions, 0 deletions
diff --git a/dom/canvas/WebGL2ContextRenderbuffers.cpp b/dom/canvas/WebGL2ContextRenderbuffers.cpp
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+++ b/dom/canvas/WebGL2ContextRenderbuffers.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "WebGL2Context.h"
+
+#include "GLContext.h"
+#include "WebGLContextUtils.h"
+#include "WebGLFormats.h"
+
+namespace mozilla {
+
+Maybe<std::vector<int32_t>> WebGL2Context::GetInternalformatParameter(
+ GLenum target, GLenum internalformat, GLenum pname) const {
+ const FuncScope funcScope(*this, "getInternalfomratParameter");
+ if (IsContextLost()) return Nothing();
+
+ if (target != LOCAL_GL_RENDERBUFFER) {
+ ErrorInvalidEnum("`target` must be RENDERBUFFER.");
+ return Nothing();
+ }
+
+ // GLES 3.0.4 $4.4.4 p212:
+ // "An internal format is color-renderable if it is one of the formats from
+ // table 3.13
+ // noted as color-renderable or if it is unsized format RGBA or RGB."
+
+ GLenum sizedFormat;
+ switch (internalformat) {
+ case LOCAL_GL_RGB:
+ sizedFormat = LOCAL_GL_RGB8;
+ break;
+ case LOCAL_GL_RGBA:
+ sizedFormat = LOCAL_GL_RGBA8;
+ break;
+ default:
+ sizedFormat = internalformat;
+ break;
+ }
+
+ // In RenderbufferStorage, we allow DEPTH_STENCIL. Therefore, it is accepted
+ // for internalformat as well. Please ignore the conformance test fail for
+ // DEPTH_STENCIL.
+
+ const auto usage = mFormatUsage->GetRBUsage(sizedFormat);
+ if (!usage) {
+ ErrorInvalidEnum(
+ "`internalformat` must be color-, depth-, or stencil-renderable, was: "
+ "0x%04x.",
+ internalformat);
+ return Nothing();
+ }
+
+ if (pname != LOCAL_GL_SAMPLES) {
+ ErrorInvalidEnum("`pname` must be SAMPLES.");
+ return Nothing();
+ }
+
+ std::vector<int32_t> ret;
+ GLint sampleCount = 0;
+ gl->fGetInternalformativ(LOCAL_GL_RENDERBUFFER, internalformat,
+ LOCAL_GL_NUM_SAMPLE_COUNTS, 1, &sampleCount);
+ if (sampleCount) {
+ ret.resize(sampleCount);
+ gl->fGetInternalformativ(LOCAL_GL_RENDERBUFFER, internalformat,
+ LOCAL_GL_SAMPLES, ret.size(), ret.data());
+ }
+
+ return Some(ret);
+}
+
+} // namespace mozilla