Add official fx renderer (#3)

include/sway/desktop/fx_renderer.h

@@ -0,0 +1,51 @@
+#ifndef _SWAY_OPENGL_H
+#define _SWAY_OPENGL_H
+
+#include <GLES2/gl2.h>
+
+struct gles2_tex_shader {
+	GLuint program;
+	GLint proj;
+	GLint tex;
+	GLint alpha;
+	GLint pos_attrib;
+	GLint tex_attrib;
+};
+
+struct fx_renderer {
+	struct wlr_egl *egl;
+
+	float projection[9];
+
+	// Shaders
+	struct {
+		struct {
+			GLuint program;
+			GLint proj;
+			GLint color;
+			GLint pos_attrib;
+		} quad;
+		struct gles2_tex_shader tex_rgba;
+		struct gles2_tex_shader tex_rgbx;
+		struct gles2_tex_shader tex_ext;
+	} shaders;
+};
+
+struct fx_renderer *fx_renderer_create(struct wlr_egl *egl);
+
+void fx_renderer_begin(struct fx_renderer *renderer, uint32_t width, uint32_t height);
+
+void fx_renderer_end();
+
+void fx_renderer_clear(const float color[static 4]);
+
+void fx_renderer_scissor(struct wlr_box *box);
+
+bool fx_render_subtexture_with_matrix(struct fx_renderer *renderer,
+		struct wlr_texture *wlr_texture, const struct wlr_fbox *box,
+		const float matrix[static 9], float alpha);
+
+bool fx_render_texture_with_matrix(struct fx_renderer *renderer,
+		struct wlr_texture *wlr_texture, const float matrix[static 9], float alpha);
+
+#endif

include/sway/server.h

@@ -35,7 +35,8 @@ struct sway_server {
 	struct wlr_backend *backend;
 	// secondary headless backend used for creating virtual outputs on-the-fly
 	struct wlr_backend *headless_backend;
-	struct wlr_renderer *renderer;
+	struct wlr_renderer *wlr_renderer;
+	struct fx_renderer *renderer;
 	struct wlr_allocator *allocator;
 
 	struct wlr_compositor *compositor;