+struct exact_format_mapping
+{
+ GLenum format;
+ GLenum type;
+ enum pipe_format pformat;
+};
+
+static const struct exact_format_mapping rgba8888_tbl[] =
+{
+ { GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, PIPE_FORMAT_A8B8G8R8_UNORM },
+ { GL_ABGR_EXT, GL_UNSIGNED_INT_8_8_8_8_REV, PIPE_FORMAT_A8B8G8R8_UNORM },
+ { GL_RGBA, GL_UNSIGNED_INT_8_8_8_8_REV, PIPE_FORMAT_R8G8B8A8_UNORM },
+ { GL_ABGR_EXT, GL_UNSIGNED_INT_8_8_8_8, PIPE_FORMAT_R8G8B8A8_UNORM },
+ { GL_BGRA, GL_UNSIGNED_INT_8_8_8_8, PIPE_FORMAT_A8R8G8B8_UNORM },
+ { GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, PIPE_FORMAT_B8G8R8A8_UNORM },
+ { GL_RGBA, GL_UNSIGNED_BYTE, PIPE_FORMAT_R8G8B8A8_UNORM },
+ { GL_ABGR_EXT, GL_UNSIGNED_BYTE, PIPE_FORMAT_A8B8G8R8_UNORM },
+ { GL_BGRA, GL_UNSIGNED_BYTE, PIPE_FORMAT_B8G8R8A8_UNORM },
+ { 0, 0, 0 }
+};
+
+static const struct exact_format_mapping rgbx8888_tbl[] =
+{
+ { GL_BGRA, GL_UNSIGNED_INT_8_8_8_8, PIPE_FORMAT_X8R8G8B8_UNORM },
+ { GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, PIPE_FORMAT_B8G8R8X8_UNORM },
+ { GL_BGRA, GL_UNSIGNED_BYTE, PIPE_FORMAT_B8G8R8X8_UNORM },
+ /* No Mesa formats for these Gallium formats:
+ { GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, PIPE_FORMAT_X8B8G8R8_UNORM },
+ { GL_ABGR_EXT, GL_UNSIGNED_INT_8_8_8_8_REV, PIPE_FORMAT_X8B8G8R8_UNORM },
+ { GL_RGBA, GL_UNSIGNED_INT_8_8_8_8_REV, PIPE_FORMAT_R8G8B8X8_UNORM },
+ { GL_ABGR_EXT, GL_UNSIGNED_INT_8_8_8_8, PIPE_FORMAT_R8G8B8X8_UNORM },
+ { GL_RGBA, GL_UNSIGNED_BYTE, PIPE_FORMAT_R8G8B8X8_UNORM },
+ { GL_ABGR_EXT, GL_UNSIGNED_BYTE, PIPE_FORMAT_X8B8G8R8_UNORM },
+ */
+ { 0, 0, 0 }
+};
+
+static const struct exact_format_mapping rgba1010102_tbl[] =
+{
+ { GL_BGRA, GL_UNSIGNED_INT_2_10_10_10_REV, PIPE_FORMAT_B10G10R10A2_UNORM },
+ /* No Mesa formats for these Gallium formats:
+ { GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, PIPE_FORMAT_R10G10B10A2_UNORM },
+ { GL_ABGR_EXT, GL_UNSIGNED_INT_10_10_10_2, PIPE_FORMAT_R10G10B10A2_UNORM },
+ { GL_ABGR_EXT, GL_UNSIGNED_INT, PIPE_FORMAT_R10G10B10A2_UNORM },
+ */
+ { 0, 0, 0 }
+};
+
+/**
+ * If there is an exact pipe_format match for {internalFormat, format, type}
+ * return that, otherwise return PIPE_FORMAT_NONE so we can do fuzzy matching.
+ */
+static enum pipe_format
+find_exact_format(GLint internalFormat, GLenum format, GLenum type)
+{
+ uint i;
+ const struct exact_format_mapping* tbl;
+
+ if (format == GL_NONE || type == GL_NONE)
+ return PIPE_FORMAT_NONE;
+
+ switch (internalFormat) {
+ case 4:
+ case GL_RGBA:
+ case GL_RGBA8:
+ tbl = rgba8888_tbl;
+ break;
+ case 3:
+ case GL_RGB:
+ case GL_RGB8:
+ tbl = rgbx8888_tbl;
+ break;
+ case GL_RGB10_A2:
+ tbl = rgba1010102_tbl;
+ break;
+ default:
+ return PIPE_FORMAT_NONE;
+ }
+
+ for (i = 0; tbl[i].format; i++)
+ if (tbl[i].format == format && tbl[i].type == type)
+ return tbl[i].pformat;
+
+ return PIPE_FORMAT_NONE;
+}