render/gles2: add a few 10-bit and FP16 formats

The half-float formats depend on GL_OES_texture_half_float_linear,
not just the GL_OES_texture_half_float extension, because the latter
does not include support for linear magni/minification filters.

The new 2101010 and 16161616F formats are only available on little-
endian builds, since their gl_types are larger than a byte and thus
endianness dependent.

include/render/gles2.h

@@ -43,6 +43,8 @@ struct wlr_gles2_renderer {
 		bool KHR_debug;
 		bool OES_egl_image_external;
 		bool OES_egl_image;
+		bool EXT_texture_type_2_10_10_10_REV;
+		bool OES_texture_half_float_linear;
 	} exts;
 
 	struct {

render/gles2/pixel_format.c

@@ -69,7 +69,30 @@ static const struct wlr_gles2_pixel_format formats[] = {
 		.gl_type = GL_UNSIGNED_SHORT_5_6_5,
 		.has_alpha = false,
 	},
-	// TODO: EXT_texture_type_2_10_10_10_REV support
+	{
+		.drm_format = DRM_FORMAT_XBGR2101010,
+		.gl_format = GL_RGBA,
+		.gl_type = GL_UNSIGNED_INT_2_10_10_10_REV_EXT,
+		.has_alpha = false,
+	},
+	{
+		.drm_format = DRM_FORMAT_ABGR2101010,
+		.gl_format = GL_RGBA,
+		.gl_type = GL_UNSIGNED_INT_2_10_10_10_REV_EXT,
+		.has_alpha = true,
+	},
+	{
+		.drm_format = DRM_FORMAT_XBGR16161616F,
+		.gl_format = GL_RGBA,
+		.gl_type = GL_HALF_FLOAT_OES,
+		.has_alpha = false,
+	},
+	{
+		.drm_format = DRM_FORMAT_ABGR16161616F,
+		.gl_format = GL_RGBA,
+		.gl_type = GL_HALF_FLOAT_OES,
+		.has_alpha = true,
+	},
 #endif
 };
 
@@ -77,6 +100,14 @@ static const struct wlr_gles2_pixel_format formats[] = {
 
 bool is_gles2_pixel_format_supported(const struct wlr_gles2_renderer *renderer,
 		const struct wlr_gles2_pixel_format *format) {
+	if (format->gl_type == GL_UNSIGNED_INT_2_10_10_10_REV_EXT
+			&& !renderer->exts.EXT_texture_type_2_10_10_10_REV) {
+		return false;
+	}
+	if (format->gl_type == GL_HALF_FLOAT_OES
+			&& !renderer->exts.OES_texture_half_float_linear) {
+		return false;
+	}
 	if (format->gl_format == GL_BGRA_EXT
 			&& !renderer->exts.EXT_read_format_bgra) {
 		return false;

render/gles2/renderer.c

@@ -749,6 +749,12 @@ struct wlr_renderer *wlr_gles2_renderer_create(struct wlr_egl *egl) {
 	renderer->exts.EXT_read_format_bgra =
 		check_gl_ext(exts_str, "GL_EXT_read_format_bgra");
 
+	renderer->exts.EXT_texture_type_2_10_10_10_REV =
+		check_gl_ext(exts_str, "GL_EXT_texture_type_2_10_10_10_REV");
+
+	renderer->exts.OES_texture_half_float_linear =
+		check_gl_ext(exts_str, "GL_OES_texture_half_float_linear");
+
 	if (check_gl_ext(exts_str, "GL_KHR_debug")) {
 		renderer->exts.KHR_debug = true;
 		load_gl_proc(&renderer->procs.glDebugMessageCallbackKHR,