1 files changed, 128 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/libANGLE/format_map_desktop.cpp b/gfx/angle/checkout/src/libANGLE/format_map_desktop.cpp
new file mode 100644
index 0000000000..17122af6a7
--- /dev/null
+++ b/gfx/angle/checkout/src/libANGLE/format_map_desktop.cpp
@@ -0,0 +1,128 @@
+// Copyright 2019 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// format_map_desktop:
+//   Determining the sized internal format from a (format,type) pair.
+//   Also check DesktopGL format combinations for validity.
+
+#include "angle_gl.h"
+#include "common/debug.h"
+#include "formatutils.h"
+#include "renderer/gl/functionsgl_enums.h"
+
+// TODO(http://anglebug.com/3730): switch ANGLE to generate its own GL enum types from gl.xml
+
+namespace gl
+{
+
+bool ValidDesktopFormat(GLenum format)
+{
+    switch (format)
+    {
+        case GL_STENCIL_INDEX:
+        case GL_DEPTH_COMPONENT:
+        case GL_DEPTH_STENCIL:
+        case GL_RED:
+        case GL_GREEN:
+        case GL_BLUE:
+        case GL_RG:
+        case GL_RGB:
+        case GL_RGBA:
+        case GL_BGR:
+        case GL_BGRA:
+        case GL_RED_INTEGER:
+        case GL_GREEN_INTEGER:
+        case GL_BLUE_INTEGER:
+        case GL_RG_INTEGER:
+        case GL_RGB_INTEGER:
+        case GL_RGBA_INTEGER:
+        case GL_BGR_INTEGER:
+        case GL_BGRA_INTEGER:
+            return true;
+
+        default:
+            return false;
+    }
+}
+
+bool ValidDesktopType(GLenum type)
+{
+    switch (type)
+    {
+        case GL_UNSIGNED_BYTE:
+        case GL_BYTE:
+        case GL_UNSIGNED_SHORT:
+        case GL_SHORT:
+        case GL_UNSIGNED_INT:
+        case GL_INT:
+        case GL_HALF_FLOAT:
+        case GL_FLOAT:
+        case GL_UNSIGNED_BYTE_3_3_2:
+        case GL_UNSIGNED_BYTE_2_3_3_REV:
+        case GL_UNSIGNED_SHORT_5_6_5:
+        case GL_UNSIGNED_SHORT_5_6_5_REV:
+        case GL_UNSIGNED_SHORT_4_4_4_4:
+        case GL_UNSIGNED_SHORT_4_4_4_4_REV:
+        case GL_UNSIGNED_SHORT_5_5_5_1:
+        case GL_UNSIGNED_SHORT_1_5_5_5_REV:
+        case GL_UNSIGNED_INT_10_10_10_2:
+        case GL_UNSIGNED_INT_2_10_10_10_REV:
+        case GL_UNSIGNED_INT_24_8:
+        case GL_UNSIGNED_INT_10F_11F_11F_REV:
+        case GL_UNSIGNED_INT_5_9_9_9_REV:
+        case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
+            return true;
+
+        default:
+            return false;
+    }
+}
+
+// From OpenGL 4.6 spec section 8.4
+bool ValidDesktopFormatCombination(GLenum format, GLenum type, GLenum internalFormat)
+{
+    ASSERT(ValidDesktopFormat(format) && ValidDesktopType(type));
+    const InternalFormat &internalFormatInfo = GetInternalFormatInfo(internalFormat, type);
+    const InternalFormat &formatInfo         = GetInternalFormatInfo(format, type);
+
+    switch (format)
+    {
+        case GL_RED_INTEGER:
+        case GL_GREEN_INTEGER:
+        case GL_BLUE_INTEGER:
+        case GL_RG_INTEGER:
+        case GL_RGB_INTEGER:
+        case GL_RGBA_INTEGER:
+        case GL_BGR_INTEGER:
+        case GL_BGRA_INTEGER:
+            switch (type)
+            {
+                case GL_HALF_FLOAT:
+                case GL_FLOAT:
+                case GL_UNSIGNED_INT_10F_11F_11F_REV:
+                case GL_UNSIGNED_INT_5_9_9_9_REV:
+                    return false;
+                default:
+                    break;
+            }
+            if (!internalFormatInfo.isInt())
+                return false;
+            break;
+        default:
+            // format is not an integer
+            if (internalFormatInfo.isInt())
+                return false;
+
+            if (formatInfo.isDepthOrStencil() != internalFormatInfo.isDepthOrStencil())
+                return false;
+
+            if (format == GL_STENCIL_INDEX && internalFormat != GL_STENCIL_INDEX)
+                return false;
+            break;
+    }
+
+    return true;
+}
+
+}  // namespace gl