1 files changed, 96 insertions, 0 deletions
diff --git a/dom/canvas/WebGL2ContextRenderbuffers.cpp b/dom/canvas/WebGL2ContextRenderbuffers.cpp
new file mode 100644
index 000000000..7a6163729
--- /dev/null
+++ b/dom/canvas/WebGL2ContextRenderbuffers.cpp
@@ -0,0 +1,96 @@
+/* -*- 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"
+
+namespace mozilla {
+
+void
+WebGL2Context::GetInternalformatParameter(JSContext* cx, GLenum target,
+                                          GLenum internalformat, GLenum pname,
+                                          JS::MutableHandleValue retval,
+                                          ErrorResult& out_rv)
+{
+    const char funcName[] = "getInternalfomratParameter";
+    retval.setObjectOrNull(nullptr);
+
+    if (IsContextLost())
+        return;
+
+    if (target != LOCAL_GL_RENDERBUFFER) {
+        ErrorInvalidEnum("%s: `target` must be RENDERBUFFER, was: 0x%04x.", funcName,
+                         target);
+        return;
+    }
+
+    // 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("%s: `internalformat` must be color-, depth-, or stencil-renderable, was: 0x%04x.",
+                         funcName, internalformat);
+        return;
+    }
+
+    if (pname != LOCAL_GL_SAMPLES) {
+        ErrorInvalidEnumInfo("%s: `pname` must be SAMPLES, was 0x%04x.", funcName, pname);
+        return;
+    }
+
+    GLint* samples = nullptr;
+    GLint sampleCount = 0;
+    gl->fGetInternalformativ(LOCAL_GL_RENDERBUFFER, internalformat,
+                             LOCAL_GL_NUM_SAMPLE_COUNTS, 1, &sampleCount);
+    if (sampleCount > 0) {
+        samples = new GLint[sampleCount];
+        gl->fGetInternalformativ(LOCAL_GL_RENDERBUFFER, internalformat, LOCAL_GL_SAMPLES,
+                                 sampleCount, samples);
+    }
+
+    JSObject* obj = dom::Int32Array::Create(cx, this, sampleCount, samples);
+    if (!obj) {
+        out_rv = NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    delete[] samples;
+
+    retval.setObjectOrNull(obj);
+}
+
+void
+WebGL2Context::RenderbufferStorageMultisample(GLenum target, GLsizei samples,
+                                              GLenum internalFormat,
+                                              GLsizei width, GLsizei height)
+{
+    const char funcName[] = "renderbufferStorageMultisample";
+    if (IsContextLost())
+        return;
+
+    RenderbufferStorage_base(funcName, target, samples, internalFormat, width, height);
+}
+
+} // namespace mozilla