1 files changed, 164 insertions, 0 deletions
diff --git a/dom/canvas/WebGL2ContextMRTs.cpp b/dom/canvas/WebGL2ContextMRTs.cpp
new file mode 100644
index 0000000000..544f8e024a
--- /dev/null
+++ b/dom/canvas/WebGL2ContextMRTs.cpp
@@ -0,0 +1,164 @@
+/* -*- 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 "WebGL2Context.h"
+
+#include "GLContext.h"
+#include "WebGLFramebuffer.h"
+
+namespace mozilla {
+
+bool WebGL2Context::ValidateClearBuffer(const GLenum buffer,
+                                        const GLint drawBuffer,
+                                        const webgl::AttribBaseType funcType) {
+  GLint maxDrawBuffer;
+  switch (buffer) {
+    case LOCAL_GL_COLOR:
+      maxDrawBuffer = Limits().maxColorDrawBuffers - 1;
+      break;
+
+    case LOCAL_GL_DEPTH:
+    case LOCAL_GL_STENCIL:
+      maxDrawBuffer = 0;
+      break;
+
+    case LOCAL_GL_DEPTH_STENCIL:
+      maxDrawBuffer = 0;
+      break;
+
+    default:
+      ErrorInvalidEnumInfo("buffer", buffer);
+      return false;
+  }
+
+  if (drawBuffer < 0 || drawBuffer > maxDrawBuffer) {
+    ErrorInvalidValue(
+        "Invalid drawbuffer %d. This buffer only supports"
+        " `drawbuffer` values between 0 and %u.",
+        drawBuffer, maxDrawBuffer);
+    return false;
+  }
+
+  ////
+
+  if (!BindCurFBForDraw()) return false;
+
+  const auto& fb = mBoundDrawFramebuffer;
+  if (fb) {
+    if (!fb->ValidateClearBufferType(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 != webgl::AttribBaseType::Float) {
+      ErrorInvalidOperation(
+          "For default framebuffer, COLOR is always of type"
+          " FLOAT.");
+      return false;
+    }
+  }
+
+  return true;
+}
+
+////
+
+void WebGL2Context::ClearBufferTv(GLenum buffer, GLint drawBuffer,
+                                  const webgl::TypedQuad& data) {
+  const FuncScope funcScope(*this, "clearBufferu?[fi]v");
+  if (IsContextLost()) return;
+
+  switch (data.type) {
+    case webgl::AttribBaseType::Boolean:
+      MOZ_ASSERT(false);
+      return;
+
+    case webgl::AttribBaseType::Float:
+      if (buffer != LOCAL_GL_COLOR && buffer != LOCAL_GL_DEPTH) {
+        ErrorInvalidEnum("`buffer` must be COLOR or DEPTH.");
+        return;
+      }
+      break;
+
+    case webgl::AttribBaseType::Int:
+      if (buffer != LOCAL_GL_COLOR && buffer != LOCAL_GL_STENCIL) {
+        ErrorInvalidEnum("`buffer` must be COLOR or STENCIL.");
+        return;
+      }
+      break;
+
+    case webgl::AttribBaseType::Uint:
+      if (buffer != LOCAL_GL_COLOR) {
+        ErrorInvalidEnum("`buffer` must be COLOR.");
+        return;
+      }
+      break;
+  }
+
+  if (!ValidateClearBuffer(buffer, drawBuffer, data.type)) {
+    return;
+  }
+
+  if (!mBoundDrawFramebuffer && buffer == LOCAL_GL_DEPTH && mNeedsFakeNoDepth) {
+    return;
+  }
+  if (!mBoundDrawFramebuffer && buffer == LOCAL_GL_STENCIL &&
+      mNeedsFakeNoStencil) {
+    return;
+  }
+
+  ScopedDrawCallWrapper wrapper(*this);
+  switch (data.type) {
+    case webgl::AttribBaseType::Boolean:
+      MOZ_ASSERT(false);
+      return;
+
+    case webgl::AttribBaseType::Float:
+      gl->fClearBufferfv(buffer, drawBuffer,
+                         reinterpret_cast<const float*>(data.data.data()));
+      break;
+
+    case webgl::AttribBaseType::Int:
+      gl->fClearBufferiv(buffer, drawBuffer,
+                         reinterpret_cast<const int32_t*>(data.data.data()));
+      break;
+
+    case webgl::AttribBaseType::Uint:
+      gl->fClearBufferuiv(buffer, drawBuffer,
+                          reinterpret_cast<const uint32_t*>(data.data.data()));
+      break;
+  }
+}
+
+////
+
+void WebGL2Context::ClearBufferfi(GLenum buffer, GLint drawBuffer,
+                                  GLfloat depth, GLint stencil) {
+  const FuncScope funcScope(*this, "clearBufferfi");
+  if (IsContextLost()) return;
+
+  if (buffer != LOCAL_GL_DEPTH_STENCIL)
+    return ErrorInvalidEnum("`buffer` must be DEPTH_STENCIL.");
+
+  const auto ignored = webgl::AttribBaseType::Float;
+  if (!ValidateClearBuffer(buffer, drawBuffer, ignored)) return;
+
+  auto driverDepth = depth;
+  auto driverStencil = stencil;
+  if (!mBoundDrawFramebuffer) {
+    if (mNeedsFakeNoDepth) {
+      driverDepth = 1.0f;
+    } else if (mNeedsFakeNoStencil) {
+      driverStencil = 0;
+    }
+  }
+
+  ScopedDrawCallWrapper wrapper(*this);
+  gl->fClearBufferfi(buffer, drawBuffer, driverDepth, driverStencil);
+}
+
+}  // namespace mozilla