Implement DRM_FORMAT to GL format conversion

src/libANGLE/renderer/gl/egl/DmaBufImageSiblingEGL.cpp

@@ -9,6 +9,65 @@
 
 #include "libANGLE/renderer/gl/egl/DmaBufImageSiblingEGL.h"
 
+namespace
+{
+
+// Refer to the following link
+// https://source.chromium.org/chromium/chromium/src/+/master:ui/gl/gl_image_native_pixmap.cc;l=24
+#define FOURCC(a, b, c, d)                                          \
+    ((static_cast<uint32_t>(a)) | (static_cast<uint32_t>(b) << 8) | \
+     (static_cast<uint32_t>(c) << 16) | (static_cast<uint32_t>(d) << 24))
+
+#define DRM_FORMAT_R8 FOURCC('R', '8', ' ', ' ')
+#define DRM_FORMAT_R16 FOURCC('R', '1', '6', ' ')
+#define DRM_FORMAT_GR88 FOURCC('G', 'R', '8', '8')
+#define DRM_FORMAT_RGB565 FOURCC('R', 'G', '1', '6')
+#define DRM_FORMAT_ARGB8888 FOURCC('A', 'R', '2', '4')
+#define DRM_FORMAT_ABGR8888 FOURCC('A', 'B', '2', '4')
+#define DRM_FORMAT_XRGB8888 FOURCC('X', 'R', '2', '4')
+#define DRM_FORMAT_XBGR8888 FOURCC('X', 'B', '2', '4')
+#define DRM_FORMAT_ABGR2101010 FOURCC('A', 'B', '3', '0')
+#define DRM_FORMAT_ARGB2101010 FOURCC('A', 'R', '3', '0')
+#define DRM_FORMAT_YVU420 FOURCC('Y', 'V', '1', '2')
+#define DRM_FORMAT_NV12 FOURCC('N', 'V', '1', '2')
+#define DRM_FORMAT_P010 FOURCC('P', '0', '1', '0')
+
+GLenum FourCCFormatToGLInternalFormat(int format)
+{
+    switch (format)
+    {
+        case DRM_FORMAT_R8:
+            return GL_R8;
+        case DRM_FORMAT_R16:
+            return GL_R16_EXT;
+        case DRM_FORMAT_GR88:
+            return GL_RG8_EXT;
+        case DRM_FORMAT_ABGR8888:
+            return GL_RGBA8;
+        case DRM_FORMAT_XBGR8888:
+            return GL_RGB8;
+        case DRM_FORMAT_ARGB8888:
+            return GL_BGRA8_EXT;
+        case DRM_FORMAT_XRGB8888:
+            return GL_RGB8;
+        case DRM_FORMAT_ABGR2101010:
+        case DRM_FORMAT_ARGB2101010:
+            return GL_RGB10_A2_EXT;
+        case DRM_FORMAT_RGB565:
+            return GL_RGB565;
+        case DRM_FORMAT_NV12:
+        case DRM_FORMAT_YVU420:
+        case DRM_FORMAT_P010:
+            return GL_RGB8;
+        default:
+            NOTREACHED();
+            WARN() << "Unknown dma_buf format " << format << " used to initialize an EGL image.";
+            return GL_RGB8;
+    }
+}
+
+}  // namespace
+
 namespace rx
 {
 DmaBufImageSiblingEGL::DmaBufImageSiblingEGL(const egl::AttributeMap &attribs)
@@ -20,10 +79,8 @@ DmaBufImageSiblingEGL::DmaBufImageSiblingEGL(const egl::AttributeMap &attribs)
     mSize.height = mAttribs.getAsInt(EGL_HEIGHT);
     mSize.depth  = 1;
 
-    // TODO(geofflang):  Implement a conversion table from DRM_FORMAT_* to GL format to expose a
-    // valid mFormat to know if this image can be rendered to. For now it's fine to always say we're
-    // RGBA8. http://anglebug.com/4529
-    mFormat = gl::Format(GL_RGBA8);
+    int fourCCFormat = mAttribs.getAsInt(EGL_LINUX_DRM_FOURCC_EXT);
+    mFormat          = gl::Format(FourCCFormatToGLInternalFormat(fourCCFormat));
 }
 
 DmaBufImageSiblingEGL::~DmaBufImageSiblingEGL() {}