1 files changed, 188 insertions, 0 deletions
diff --git a/dom/canvas/WebGL2ContextMRTs.cpp b/dom/canvas/WebGL2ContextMRTs.cpp
new file mode 100644
index 000000000..18e235bd6
--- /dev/null
+++ b/dom/canvas/WebGL2ContextMRTs.cpp
@@ -0,0 +1,188 @@
+/* -*- 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 "WebGL2Context.h"
+
+#include "GLContext.h"
+#include "WebGLFramebuffer.h"
+
+namespace mozilla {
+
+bool
+WebGL2Context::ValidateClearBuffer(const char* funcName, GLenum buffer, GLint drawBuffer,
+                                   size_t availElemCount, GLuint elemOffset,
+                                   GLenum funcType)
+{
+    if (elemOffset > availElemCount) {
+        ErrorInvalidValue("%s: Offset too big for list.", funcName);
+        return false;
+    }
+    availElemCount -= elemOffset;
+
+    ////
+
+    size_t requiredElements;
+    GLint maxDrawBuffer;
+    switch (buffer) {
+    case LOCAL_GL_COLOR:
+          requiredElements = 4;
+          maxDrawBuffer = mGLMaxDrawBuffers - 1;
+          break;
+
+    case LOCAL_GL_DEPTH:
+    case LOCAL_GL_STENCIL:
+          requiredElements = 1;
+          maxDrawBuffer = 0;
+          break;
+
+    case LOCAL_GL_DEPTH_STENCIL:
+          requiredElements = 2;
+          maxDrawBuffer = 0;
+          break;
+
+    default:
+          ErrorInvalidEnumInfo(funcName, buffer);
+          return false;
+    }
+
+    if (drawBuffer < 0 || drawBuffer > maxDrawBuffer) {
+        ErrorInvalidValue("%s: Invalid drawbuffer %d. This buffer only supports"
+                          " `drawbuffer` values between 0 and %u.",
+                          funcName, drawBuffer, maxDrawBuffer);
+        return false;
+    }
+
+    if (availElemCount < requiredElements) {
+        ErrorInvalidValue("%s: Not enough elements. Require %u. Given %u.",
+                          funcName, requiredElements, availElemCount);
+        return false;
+    }
+
+    ////
+
+    MakeContextCurrent();
+
+    const auto& fb = mBoundDrawFramebuffer;
+    if (fb) {
+        if (!fb->ValidateAndInitAttachments(funcName))
+            return false;
+
+        if (!fb->ValidateClearBufferType(funcName, buffer, drawBuffer, funcType))
+            return false;
+    } else if (buffer == LOCAL_GL_COLOR) {
+        if (drawBuffer != 0)
+            return true;
+
+        if (mDefaultFB_DrawBuffer0 == LOCAL_GL_NONE)
+            return true;
+
+        if (funcType != LOCAL_GL_FLOAT) {
+            ErrorInvalidOperation("%s: For default framebuffer, COLOR is always of type"
+                                  " FLOAT.",
+                                  funcName);
+            return false;
+        }
+    }
+
+    return true;
+}
+
+////
+
+void
+WebGL2Context::ClearBufferfv(GLenum buffer, GLint drawBuffer, const Float32Arr& src,
+                             GLuint srcElemOffset)
+{
+    const char funcName[] = "clearBufferfv";
+    if (IsContextLost())
+        return;
+
+    if (buffer != LOCAL_GL_COLOR &&
+        buffer != LOCAL_GL_DEPTH)
+    {
+        ErrorInvalidEnum("%s: buffer must be COLOR or DEPTH.", funcName);
+        return;
+    }
+
+    if (!ValidateClearBuffer(funcName, buffer, drawBuffer, src.elemCount, srcElemOffset,
+                             LOCAL_GL_FLOAT))
+    {
+        return;
+    }
+
+    ScopedDrawCallWrapper wrapper(*this);
+    const auto ptr = src.elemBytes + srcElemOffset;
+    gl->fClearBufferfv(buffer, drawBuffer, ptr);
+}
+
+void
+WebGL2Context::ClearBufferiv(GLenum buffer, GLint drawBuffer, const Int32Arr& src,
+                             GLuint srcElemOffset)
+{
+    const char funcName[] = "clearBufferiv";
+    if (IsContextLost())
+        return;
+
+    if (buffer != LOCAL_GL_COLOR &&
+        buffer != LOCAL_GL_STENCIL)
+    {
+        ErrorInvalidEnum("%s: buffer must be COLOR or STENCIL.", funcName);
+        return;
+    }
+
+    if (!ValidateClearBuffer(funcName, buffer, drawBuffer, src.elemCount, srcElemOffset,
+                             LOCAL_GL_INT))
+    {
+        return;
+    }
+
+    ScopedDrawCallWrapper wrapper(*this);
+    const auto ptr = src.elemBytes + srcElemOffset;
+    gl->fClearBufferiv(buffer, drawBuffer, ptr);
+}
+
+void
+WebGL2Context::ClearBufferuiv(GLenum buffer, GLint drawBuffer, const Uint32Arr& src,
+                              GLuint srcElemOffset)
+{
+    const char funcName[] = "clearBufferuiv";
+    if (IsContextLost())
+        return;
+
+    if (buffer != LOCAL_GL_COLOR)
+        return ErrorInvalidEnum("%s: buffer must be COLOR.", funcName);
+
+    if (!ValidateClearBuffer(funcName, buffer, drawBuffer, src.elemCount, srcElemOffset,
+                             LOCAL_GL_UNSIGNED_INT))
+    {
+        return;
+    }
+
+    ScopedDrawCallWrapper wrapper(*this);
+    const auto ptr = src.elemBytes + srcElemOffset;
+    gl->fClearBufferuiv(buffer, drawBuffer, ptr);
+}
+
+////
+
+void
+WebGL2Context::ClearBufferfi(GLenum buffer, GLint drawBuffer, GLfloat depth,
+                             GLint stencil)
+{
+    const char funcName[] = "clearBufferfi";
+    if (IsContextLost())
+        return;
+
+    if (buffer != LOCAL_GL_DEPTH_STENCIL)
+        return ErrorInvalidEnum("%s: buffer must be DEPTH_STENCIL.", funcName);
+
+    if (!ValidateClearBuffer(funcName, buffer, drawBuffer, 2, 0, 0))
+        return;
+
+    ScopedDrawCallWrapper wrapper(*this);
+    gl->fClearBufferfi(buffer, drawBuffer, depth, stencil);
+}
+
+} // namespace mozilla