Further improvements to rendering subsystem

17 files changed, 474 insertions, 335 deletions

diff --git a/example/rotation.c b/example/rotation.c
index 9df18da9..6a13b2da 100644
--- a/example/rotation.c
+++ b/example/rotation.c
@@ -9,6 +9,7 @@
 #include <wayland-server-protocol.h>
 #include <GLES3/gl3.h>
 #include <wlr/render/matrix.h>
+#include <wlr/render/gles3.h>
 #include <wlr/render.h>
 #include <wlr/backend.h>
 #include <wlr/session.h>
@@ -46,22 +47,23 @@ static void output_frame(struct wl_listener *listener, void *data) {
 	struct wlr_output *output = ostate->output;
 	struct state *s = ostate->state;
 
-	glClearColor(0.25f, 0.25f, 0.25f, 1);
-	glClear(GL_COLOR_BUFFER_BIT);
+	wlr_renderer_begin(s->renderer, output);
 
-	int32_t width = output->width;
-	int32_t height = output->height;
-	glViewport(0, 0, width, height);
-	wlr_output_effective_resolution(output, &width, &height);
+	float matrix[16];
+	wlr_surface_get_matrix(s->cat_texture, &matrix,
+		&output->transform_matrix, ostate->x, ostate->y);
+	wlr_render_with_matrix(s->renderer, s->cat_texture, &matrix);
 
-	wlr_render_quad(s->renderer, s->cat_texture,
-			&output->transform_matrix, ostate->x, ostate->y);
+	wlr_renderer_end(s->renderer);
 
 	struct timespec now;
 	clock_gettime(CLOCK_MONOTONIC, &now);
 	long ms = (now.tv_sec - ostate->last_frame.tv_sec) * 1000 +
 		(now.tv_nsec - ostate->last_frame.tv_nsec) / 1000000;
 	float seconds = ms / 1000.0f;
+
+	int32_t width, height;
+	wlr_output_effective_resolution(output, &width, &height);
 	ostate->x += ostate->vel_x * seconds;
 	ostate->y += ostate->vel_y * seconds;
 	if (ostate->y > height - 128) {
@@ -224,8 +226,8 @@ int main(int argc, char *argv[]) {
 		return 1;
 	}
 
-	state.renderer = wlr_renderer_init();
-	state.cat_texture = wlr_surface_init();
+	state.renderer = wlr_gles3_renderer_init();
+	state.cat_texture = wlr_render_surface_init(state.renderer);
 	wlr_surface_attach_pixels(state.cat_texture, GL_RGB,
 		cat_tex.width, cat_tex.height, cat_tex.pixel_data);
 
@@ -239,11 +241,11 @@ int main(int argc, char *argv[]) {
 		wl_event_loop_dispatch(event_loop, 0);
 	}
 
-	wlr_renderer_destroy(state.renderer);
-	wlr_surface_destroy(state.cat_texture);
 	wl_event_source_remove(timer);
 	wlr_backend_destroy(wlr);
 	wlr_session_finish(session);
+	wlr_surface_destroy(state.cat_texture);
+	wlr_renderer_destroy(state.renderer);
 	wl_display_destroy(display);
 
 	struct output_config *ptr, *tmp;
diff --git a/include/render.h b/include/render.h
deleted file mode 100644
index 0f977eb0..00000000
--- a/include/render.h
+++ /dev/null
@@ -1,29 +0,0 @@
-#ifndef _WLR_RENDER_INTERNAL_H
-#define _WLR_RENDER_INTERNAL_H
-#include <stdint.h>
-#include <wlr/render.h>
-#include <wayland-util.h>
-#include <GLES3/gl3.h>
-#include <stdbool.h>
-
-struct wlr_surface {
-	bool valid;
-	GLuint tex_id;
-	uint32_t format;
-	int width, height;
-};
-
-struct wlr_shader {
-	bool valid;
-	uint32_t format;
-	GLuint vert;
-	GLuint program;
-	struct wlr_shader *next;
-};
-
-struct wlr_renderer {
-	struct wlr_shader *shader;
-	// TODO: EGL stuff
-};
-
-#endif
diff --git a/include/render/gles3.h b/include/render/gles3.h
new file mode 100644
index 00000000..91b738a6
--- /dev/null
+++ b/include/render/gles3.h
@@ -0,0 +1,18 @@
+#ifndef _WLR_RENDER_GLES2_INTERNAL_H
+#define _WLR_RENDER_GLES2_INTERNAL_H
+#include <stdint.h>
+#include <GLES3/gl3.h>
+#include <wlr/render.h>
+
+struct wlr_surface_state {
+	struct wlr_surface *wlr_surface;
+	GLuint tex_id;
+};
+
+struct wlr_surface *gles3_surface_init();
+
+extern const GLchar vertex_src[];
+extern const GLchar fragment_src_RGB[];
+extern const GLchar fragment_src_RGBA[];
+
+#endif
diff --git a/include/wlr/render.h b/include/wlr/render.h
index 3335b3d5..88aa615e 100644
--- a/include/wlr/render.h
+++ b/include/wlr/render.h
@@ -2,30 +2,74 @@
 #define _WLR_RENDER_H
 #include <stdint.h>
 #include <wayland-server-protocol.h>
+#include <wlr/types.h>
 
 struct wlr_surface;
-struct wlr_surface *wlr_surface_init();
-void wlr_surface_attach_pixels(struct wlr_surface *surf, uint32_t format,
+struct wlr_renderer;
+
+void wlr_renderer_begin(struct wlr_renderer *r, struct wlr_output *output);
+void wlr_renderer_end(struct wlr_renderer *r);
+/**
+ * Requests a surface handle from this renderer.
+ */
+struct wlr_surface *wlr_render_surface_init(struct wlr_renderer *r);
+/**
+ * Renders the requested surface using the provided matrix. A typical surface
+ * rendering goes like so:
+ *
+ * 	struct wlr_renderer *renderer;
+ * 	struct wlr_surface *surface;
+ * 	float projection[16];
+ * 	float matrix[16];
+ * 	wlr_surface_get_matrix(surface, &matrix, &projection, 123, 321);
+ * 	wlr_render_with_matrix(renderer, surface, &matrix);
+ *
+ * This will render the surface at <123, 321>.
+ */
+bool wlr_render_with_matrix(struct wlr_renderer *r,
+		struct wlr_surface *surface, const float (*matrix)[16]);
+/**
+ * Destroys this wlr_renderer. Surfaces must be destroyed separately.
+ */
+void wlr_renderer_destroy(struct wlr_renderer *renderer);
+
+struct wlr_surface_impl;
+struct wlr_surface_state;
+
+struct wlr_surface {
+	struct wlr_surface_impl *impl;
+	struct wlr_surface_state *state;
+	bool valid;
+	uint32_t format;
+	int width, height;
+};
+
+/**
+ * Attaches a pixel buffer to this surface. The buffer may be discarded after
+ * calling this function.
+ */
+bool wlr_surface_attach_pixels(struct wlr_surface *surf, uint32_t format,
 		int width, int height, const unsigned char *pixels);
-void wlr_surface_attach_shm(struct wlr_surface *surf, uint32_t format,
+/**
+ * Attaches pixels from a wl_shm_buffer to this surface. The shm buffer may be
+ * invalidated after calling this function.
+ */
+bool wlr_surface_attach_shm(struct wlr_surface *surf, uint32_t format,
 		struct wl_shm_buffer *shm);
-// TODO: EGL
+/**
+ * Prepares a matrix with the appropriate scale for the given surface and
+ * multiplies it with the projection, producing a matrix that the shader can
+ * muptlipy vertex coordinates with to get final screen coordinates.
+ * 
+ * The projection matrix is assumed to be an orthographic projection of [0,
+ * width) and [0, height], and the x and y coordinates provided are used as
+ * such.
+ */
+void wlr_surface_get_matrix(struct wlr_surface *surface,
+		float (*matrix)[16], const float (*projection)[16], int x, int y);
+/**
+ * Destroys this wlr_surface.
+ */
 void wlr_surface_destroy(struct wlr_surface *tex);
 
-struct wlr_shader;
-struct wlr_shader *wlr_shader_init(const char *vertex);
-bool wlr_shader_add_format(struct wlr_shader *shader, uint32_t format,
-		const char *frag);
-bool wlr_shader_use(struct wlr_shader *shader, uint32_t format);
-void wlr_shader_destroy(struct wlr_shader *shader);
-
-struct wlr_renderer;
-struct wlr_renderer *wlr_renderer_init();
-void wlr_renderer_set_shader(struct wlr_renderer *renderer,
-		struct wlr_shader *shader);
-bool wlr_render_quad(struct wlr_renderer *renderer,
-		struct wlr_surface *surf, float (*transform)[16],
-		float x, float y);
-void wlr_renderer_destroy(struct wlr_renderer *renderer);
-
 #endif
diff --git a/include/wlr/render/gles3.h b/include/wlr/render/gles3.h
new file mode 100644
index 00000000..7b60bb97
--- /dev/null
+++ b/include/wlr/render/gles3.h
@@ -0,0 +1,7 @@
+#ifndef _WLR_GLES3_RENDERER_H
+#define _WLR_GLES3_RENDERER_H
+#include <wlr/render.h>
+
+struct wlr_renderer *wlr_gles3_renderer_init();
+
+#endif
diff --git a/include/wlr/render/interface.h b/include/wlr/render/interface.h
new file mode 100644
index 00000000..80471ac8
--- /dev/null
+++ b/include/wlr/render/interface.h
@@ -0,0 +1,43 @@
+#ifndef _WLR_RENDER_INTERFACE_H
+#define _WLR_RENDER_INTERFACE_H
+#include <wayland-server-protocol.h>
+#include <stdbool.h>
+#include <wlr/render.h>
+#include <wlr/types.h>
+
+struct wlr_renderer_impl;
+struct wlr_renderer_state;
+
+struct wlr_renderer {
+	struct wlr_renderer_impl *impl;
+	struct wlr_renderer_state *state;
+};
+
+struct wlr_renderer_impl {
+	void (*begin)(struct wlr_renderer_state *state, struct wlr_output *output);
+	void (*end)(struct wlr_renderer_state *state);
+	struct wlr_surface *(*surface_init)(struct wlr_renderer_state *state);
+	bool (*render_with_matrix)(struct wlr_renderer_state *state,
+		struct wlr_surface *surface, const float (*matrix)[16]);
+	void (*destroy)(struct wlr_renderer_state *state);
+};
+
+struct wlr_renderer *wlr_renderer_init(struct wlr_renderer_state *state,
+		struct wlr_renderer_impl *impl);
+
+struct wlr_surface_impl {
+	bool (*attach_pixels)(struct wlr_surface_state *state, uint32_t format,
+		int width, int height, const unsigned char *pixels);
+	bool (*attach_shm)(struct wlr_surface_state *state, uint32_t format,
+		struct wl_shm_buffer *shm);
+	// TODO: egl
+	void (*get_matrix)(struct wlr_surface_state *state,
+			float (*matrix)[16], const float (*projection)[16], int x, int y);
+	void (*bind)(struct wlr_surface_state *state);
+	void (*destroy)(struct wlr_surface_state *state);
+};
+
+struct wlr_surface *wlr_surface_init();
+void wlr_surface_bind(struct wlr_surface *surface);
+
+#endif
diff --git a/include/wlr/render/matrix.h b/include/wlr/render/matrix.h
index a1053b00..954207da 100644
--- a/include/wlr/render/matrix.h
+++ b/include/wlr/render/matrix.h
@@ -5,6 +5,6 @@ void wlr_matrix_identity(float (*output)[16]);
 void wlr_matrix_translate(float (*output)[16], float x, float y, float z);
 void wlr_matrix_scale(float (*output)[16], float x, float y, float z);
 void wlr_matrix_rotate(float (*output)[16], float radians);
-void wlr_matrix_mul(float (*x)[16], float (*y)[16], float (*product)[16]);
+void wlr_matrix_mul(const float (*x)[16], const float (*y)[16], float (*product)[16]);
 
 #endif
diff --git a/render/CMakeLists.txt b/render/CMakeLists.txt
index bd247d56..aabf42d8 100644
--- a/render/CMakeLists.txt
+++ b/render/CMakeLists.txt
@@ -1,6 +1,8 @@
 add_library(wlr-render STATIC
 	matrix.c
-    shader.c
-    surface.c
-    renderer.c
+    wlr_renderer.c
+    wlr_surface.c
+    gles3/shaders.c
+    gles3/renderer.c
+    gles3/surface.c
 )
diff --git a/render/gles3/renderer.c b/render/gles3/renderer.c
new file mode 100644
index 00000000..8f602fcf
--- /dev/null
+++ b/render/gles3/renderer.c
@@ -0,0 +1,161 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <GLES3/gl3.h>
+#include <wayland-util.h>
+#include <wayland-server-protocol.h>
+#include <wlr/render.h>
+#include <wlr/render/interface.h>
+#include <wlr/render/matrix.h>
+#include <common/log.h>
+#include "render/gles3.h"
+
+static struct {
+	bool initialized;
+	GLuint rgb, rgba;
+} shaders;
+static GLuint vao, vbo, ebo;
+
+static bool compile_shader(GLuint type, const GLchar *src, GLuint *shader) {
+	*shader = glCreateShader(type);
+	int len = strlen(src);
+	glShaderSource(*shader, 1, &src, &len);
+	glCompileShader(*shader);
+	GLint success;
+	glGetShaderiv(*shader, GL_COMPILE_STATUS, &success);
+	if (success == GL_FALSE) {
+		GLint loglen;
+		glGetShaderiv(*shader, GL_INFO_LOG_LENGTH, &loglen);
+		GLchar msg[loglen];
+		glGetShaderInfoLog(*shader, loglen, &loglen, msg);
+		return false;
+	}
+	return true;
+}
+
+static bool compile_program(const GLchar *vert_src,
+		const GLchar *frag_src, GLuint *program) {
+	GLuint vertex, fragment;
+	if (!compile_shader(GL_VERTEX_SHADER, vert_src, &vertex)) {
+		return false;
+	}
+	if (!compile_shader(GL_FRAGMENT_SHADER, frag_src, &fragment)) {
+		glDeleteProgram(vertex);
+		return false;
+	}
+	*program = glCreateProgram();
+	glAttachShader(*program, vertex);
+	glAttachShader(*program, fragment);
+	glLinkProgram(*program);
+	glDeleteProgram(vertex);
+	glDeleteProgram(fragment);
+	return true;
+}
+
+static void init_default_shaders() {
+	if (shaders.initialized) {
+		return;
+	}
+	if (!compile_program(vertex_src, fragment_src_RGB, &shaders.rgb)) {
+		goto error;
+	}
+	if (!compile_program(vertex_src, fragment_src_RGBA, &shaders.rgba)) {
+		goto error;
+	}
+	return;
+error:
+	wlr_log(L_ERROR, "Failed to set up default shaders!");
+}
+
+static void init_default_quad() {
+	GLfloat verticies[] = {
+		1, 1, 1, 1, // bottom right
+		1, 0, 1, 0, // top right
+		0, 0, 0, 0, // top left
+		0, 1, 0, 1, // bottom left
+	};
+	GLuint indicies[] = {
+		0, 1, 3,
+		1, 2, 3,
+	};
+
+	glGenVertexArrays(1, &vao);
+	glGenBuffers(1, &vbo);
+
+	glBindVertexArray(vao);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+
+	glEnableVertexAttribArray(0);
+	glEnableVertexAttribArray(1);
+	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), (void *)0);
+	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), (void *)(2 * sizeof(GLfloat)));
+	glBufferData(GL_ARRAY_BUFFER, sizeof(verticies), verticies, GL_STATIC_DRAW);
+
+	glGenBuffers(1, &ebo);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
+	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indicies), indicies, GL_STATIC_DRAW);
+}
+
+static void init_globals() {
+	init_default_shaders();
+	init_default_quad();
+}
+
+static void wlr_gles3_begin(struct wlr_renderer_state *state,
+		struct wlr_output *output) {
+	// TODO: let users customize the clear color?
+	glClearColor(0.25f, 0.25f, 0.25f, 1);
+	glClear(GL_COLOR_BUFFER_BIT);
+	int32_t width = output->width;
+	int32_t height = output->height;
+	glViewport(0, 0, width, height);
+	// Note: maybe we should save output projection and remove some of the need
+	// for users to sling matricies themselves
+}
+
+static void wlr_gles3_end(struct wlr_renderer_state *state) {
+	// no-op
+}
+
+static struct wlr_surface *wlr_gles3_surface_init(struct wlr_renderer_state *state) {
+	return gles3_surface_init();
+}
+
+static bool wlr_gles3_render_surface(struct wlr_renderer_state *state,
+		struct wlr_surface *surface, const float (*matrix)[16]) {
+	assert(surface && surface->valid);
+	switch (surface->format) {
+	case GL_RGB:
+		glUseProgram(shaders.rgb);
+		break;
+	case GL_RGBA:
+		glUseProgram(shaders.rgba);
+		break;
+	default:
+		return false;
+	}
+	glBindVertexArray(vao);
+	glBindBuffer(GL_ARRAY_BUFFER, vbo);
+	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
+	wlr_surface_bind(surface);
+	glUniformMatrix4fv(0, 1, GL_TRUE, *matrix);
+	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+	return true;
+}
+
+static void wlr_gles3_destroy(struct wlr_renderer_state *state) {
+	// no-op
+}
+
+static struct wlr_renderer_impl wlr_renderer_impl = {
+	.begin = wlr_gles3_begin,
+	.end = wlr_gles3_end,
+	.surface_init = wlr_gles3_surface_init,
+	.render_with_matrix = wlr_gles3_render_surface,
+	.destroy = wlr_gles3_destroy
+};
+
+struct wlr_renderer *wlr_gles3_renderer_init() {
+	init_globals();
+	return wlr_renderer_init(NULL, &wlr_renderer_impl);
+}
diff --git a/render/gles3/shaders.c b/render/gles3/shaders.c
new file mode 100644
index 00000000..f53ef385
--- /dev/null
+++ b/render/gles3/shaders.c
@@ -0,0 +1,28 @@
+#include "render/gles3.h"
+#include <GLES3/gl3.h>
+
+const GLchar vertex_src[] =
+"uniform mat4 proj;\n"
+"attribute vec2 pos;\n"
+"attribute vec2 texcoord;\n"
+"varying vec2 v_texcoord;\n"
+"void main() {\n"
+"	gl_Position = proj * vec4(pos, 0.0, 1.0);\n"
+"	v_texcoord = texcoord;\n"
+"}\n";
+
+const GLchar fragment_src_RGB[] =
+"precision mediump float;\n"
+"varying vec2 v_texcoord;\n"
+"uniform sampler2D tex;\n"
+"void main() {\n"
+"	gl_FragColor = vec4(texture2D(tex, v_texcoord).rgb, 1.0);\n"
+"}\n";
+
+const GLchar fragment_src_RGBA[] =
+"precision mediump float;\n"
+"varying vec2 v_texcoord;\n"
+"uniform sampler2D tex;\n"
+"void main() {\n"
+"	gl_FragColor = texture2D(tex, v_texcoord);\n"
+"}\n";
diff --git a/render/gles3/surface.c b/render/gles3/surface.c
new file mode 100644
index 00000000..09d78715
--- /dev/null
+++ b/render/gles3/surface.c
@@ -0,0 +1,63 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <GLES3/gl3.h>
+#include <wayland-util.h>
+#include <wayland-server-protocol.h>
+#include <wlr/render.h>
+#include <wlr/render/interface.h>
+#include <wlr/render/matrix.h>
+#include "render/gles3.h"
+
+static bool gles3_surface_attach_pixels(struct wlr_surface_state *surface,
+		uint32_t format, int width, int height, const unsigned char *pixels) {
+	assert(surface);
+	surface->wlr_surface->width = width;
+	surface->wlr_surface->height = height;
+	surface->wlr_surface->format = format;
+	// TODO: Error handling
+	glGenTextures(1, &surface->tex_id);
+	glBindTexture(GL_TEXTURE_2D, surface->tex_id);
+	glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0,
+			format, GL_UNSIGNED_BYTE, pixels);
+	surface->wlr_surface->valid = true;
+	return true;
+}
+
+static void gles3_surface_get_matrix(struct wlr_surface_state *surface,
+		float (*matrix)[16], const float (*projection)[16], int x, int y) {
+	struct wlr_surface *_surface = surface->wlr_surface;
+	float world[16];
+	wlr_matrix_identity(matrix);
+	wlr_matrix_translate(&world, x, y, 0);
+	wlr_matrix_mul(matrix, &world, matrix);
+	wlr_matrix_scale(&world, _surface->width, _surface->height, 1);
+	wlr_matrix_mul(matrix, &world, matrix);
+	wlr_matrix_mul(projection, matrix, matrix);
+}
+
+static void gles3_surface_bind(struct wlr_surface_state *surface) {
+	glActiveTexture(GL_TEXTURE0 + 1);
+	glBindTexture(GL_TEXTURE_2D, surface->tex_id);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+}
+
+static void gles3_surface_destroy(struct wlr_surface_state *surface) {
+	// TODO
+}
+
+static struct wlr_surface_impl wlr_surface_impl = {
+	.attach_pixels = gles3_surface_attach_pixels,
+	// .attach_shm = TODO
+	.get_matrix = gles3_surface_get_matrix,
+	.bind = gles3_surface_bind,
+	.destroy = gles3_surface_destroy,
+};
+
+struct wlr_surface *gles3_surface_init() {
+	struct wlr_surface_state *state = calloc(sizeof(struct wlr_surface_state), 1);
+	struct wlr_surface *surface = wlr_surface_init(state, &wlr_surface_impl);
+	state->wlr_surface = surface;
+	return surface;
+}
diff --git a/render/matrix.c b/render/matrix.c
index 7d111c38..4de20e5d 100644
--- a/render/matrix.c
+++ b/render/matrix.c
@@ -41,7 +41,7 @@ void wlr_matrix_rotate(float (*output)[16], float radians) {
 	(*output)[mind(2, 2)] = _cos;
 }
 
-void wlr_matrix_mul(float (*x)[16], float (*y)[16], float (*product)[16]) {
+void wlr_matrix_mul(const float (*x)[16], const float (*y)[16], float (*product)[16]) {
 	float _product[16] = {
 		(*x)[mind(1, 1)] * (*y)[mind(1, 1)] + (*x)[mind(1, 2)] * (*y)[mind(2, 1)] +
 			(*x)[mind(1, 3)] * (*y)[mind(3, 1)] + (*x)[mind(1, 4)] * (*y)[mind(4, 1)],
diff --git a/render/renderer.c b/render/renderer.c
deleted file mode 100644
index 174272a9..00000000
--- a/render/renderer.c
+++ /dev/null
@@ -1,138 +0,0 @@
-#include <stdint.h>
-#include <stdlib.h>
-#include <assert.h>
-#include <GLES3/gl3.h>
-#include <wayland-util.h>
-#include <wayland-server-protocol.h>
-#include <wlr/render.h>
-#include <wlr/render/matrix.h>
-#include <common/log.h>
-#include "render.h"
-
-static struct wlr_shader *default_shader = NULL;
-
-static const GLchar vert_src[] =
-"uniform mat4 proj;\n"
-"attribute vec2 pos;\n"
-"attribute vec2 texcoord;\n"
-"varying vec2 v_texcoord;\n"
-"void main() {\n"
-"	gl_Position = proj * vec4(pos, 0.0, 1.0);\n"
-"	v_texcoord = texcoord;\n"
-"}\n";
-
-static const GLchar frag_src_RGB[] =
-"precision mediump float;\n"
-"varying vec2 v_texcoord;\n"
-"uniform sampler2D tex;\n"
-"void main() {\n"
-"	gl_FragColor = vec4(texture2D(tex, v_texcoord).rgb, 1.0);\n"
-"}\n";
-
-static const GLchar frag_src_RGBA[] =
-"precision mediump float;\n"
-"varying vec2 v_texcoord;\n"
-"uniform sampler2D tex;\n"
-"void main() {\n"
-"	gl_FragColor = texture2D(tex, v_texcoord);\n"
-"}\n";
-
-static void default_shader_init() {
-	if (default_shader) {
-		return;
-	}
-	default_shader = wlr_shader_init(vert_src);
-	if (!default_shader) {
-		goto error;
-	}
-	if (!wlr_shader_add_format(default_shader, GL_RGB, frag_src_RGB)) {
-		goto error;
-	}
-	if (!wlr_shader_add_format(default_shader, GL_RGBA, frag_src_RGBA)) {
-		goto error;
-	}
-	return;
-error:
-	wlr_shader_destroy(default_shader);
-	wlr_log(L_ERROR, "Failed to set up default shaders!");
-}
-
-static GLuint vao, vbo, ebo;
-
-static void default_quad_init() {
-	GLfloat verticies[] = {
-		1, 1, 1, 1, // bottom right
-		1, 0, 1, 0, // top right
-		0, 0, 0, 0, // top left
-		0, 1, 0, 1, // bottom left
-	};
-	GLuint indicies[] = {
-		0, 1, 3,
-		1, 2, 3,
-	};
-
-	glGenVertexArrays(1, &vao);
-	glGenBuffers(1, &vbo);
-
-	glBindVertexArray(vao);
-	glBindBuffer(GL_ARRAY_BUFFER, vbo);
-
-	glEnableVertexAttribArray(0);
-	glEnableVertexAttribArray(1);
-	glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), (void *)0);
-	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(GLfloat), (void *)(2 * sizeof(GLfloat)));
-	glBufferData(GL_ARRAY_BUFFER, sizeof(verticies), verticies, GL_STATIC_DRAW);
-
-	glGenBuffers(1, &ebo);
-	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
-	glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indicies), indicies, GL_STATIC_DRAW);
-}
-
-static void global_init() {
-	default_shader_init();
-	default_quad_init();
-}
-
-struct wlr_renderer *wlr_renderer_init() {
-	global_init();
-	struct wlr_renderer *r = calloc(sizeof(struct wlr_renderer), 1);
-	r->shader = default_shader;
-	return r;
-}
-
-void wlr_renderer_set_shader(struct wlr_renderer *renderer,
-		struct wlr_shader *shader) {
-	assert(renderer);
-	renderer->shader = shader;
-}
-
-bool wlr_render_quad(struct wlr_renderer *renderer,
-		struct wlr_surface *surf, float (*transform)[16],
-		float x, float y) {
-	assert(renderer && surf && renderer->shader && surf->valid);
-	wlr_shader_use(renderer->shader, surf->format);
-
-	glBindVertexArray(vao);
-	glBindBuffer(GL_ARRAY_BUFFER, vbo);
-	glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
-	glActiveTexture(GL_TEXTURE0 + 1);
-	glBindTexture(GL_TEXTURE_2D, surf->tex_id);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-
-	float world[16], final[16];
-	wlr_matrix_identity(&final);
-	wlr_matrix_translate(&world, x, y, 0);
-	wlr_matrix_mul(&final, &world, &final);
-	wlr_matrix_scale(&world, surf->width, surf->height, 1);
-	wlr_matrix_mul(&final, &world, &final);
-	wlr_matrix_mul(transform, &final, &final);
-	glUniformMatrix4fv(0, 1, GL_TRUE, final);
-
-	glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
-	return false;
-}
-
-void wlr_renderer_destroy(struct wlr_renderer *renderer) {
-	// TODO
-}
diff --git a/render/shader.c b/render/shader.c
deleted file mode 100644
index 63797b8a..00000000
--- a/render/shader.c
+++ /dev/null
@@ -1,97 +0,0 @@
-#include <assert.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <stdbool.h>
-#include <GLES3/gl3.h>
-#include <wlr/render.h>
-#include <wlr/render/matrix.h>
-#include "render.h"
-
-static bool create_shader(GLenum type, const GLchar *src, GLint len, GLuint *shader) {
-	*shader = glCreateShader(type);
-	glShaderSource(*shader, 1, &src, &len);
-	glCompileShader(*shader);
-
-	GLint success;
-	glGetShaderiv(*shader, GL_COMPILE_STATUS, &success);
-
-	if (success == GL_FALSE) {
-		GLint loglen;
-		glGetShaderiv(*shader, GL_INFO_LOG_LENGTH, &loglen);
-
-		GLchar msg[loglen];
-		glGetShaderInfoLog(*shader, loglen, &loglen, msg);
-		return false;
-	}
-	return true;
-}
-
-struct wlr_shader *wlr_shader_init(const char *vertex) {
-	struct wlr_shader *shader = calloc(sizeof(struct wlr_shader), 1);
-	if (!create_shader(GL_VERTEX_SHADER, vertex, strlen(vertex), &shader->vert)) {
-		wlr_shader_destroy(shader);
-		return NULL;
-	}
-	return shader;
-}
-
-bool wlr_shader_add_format(struct wlr_shader *shader, uint32_t format,
-		const char *frag) {
-	assert(shader);
-	struct wlr_shader *_shader = shader;
-	if (_shader->valid) {
-		shader = calloc(sizeof(struct wlr_shader), 1);
-		shader->vert = _shader->vert;
-	} else {
-		while (shader->next) {
-			_shader = shader;
-			shader = shader->next;
-		}
-	}
-	shader->format = format;
-	GLuint _frag;
-	if (!create_shader(GL_FRAGMENT_SHADER, frag, strlen(frag), &_frag)) {
-		goto error;
-	}
-	shader->program = glCreateProgram();
-	glAttachShader(shader->program, shader->vert);
-	glAttachShader(shader->program, _frag);
-	glLinkProgram(shader->program);
-	glDeleteProgram(_frag);
-	if (_shader->valid) {
-		_shader->next = shader;
-	}
-	shader->valid = true;
-	return true;
-error:
-	if (_shader->valid) {
-		wlr_shader_destroy(shader);
-	}
-	return false;
-}
-
-bool wlr_shader_use(struct wlr_shader *shader, uint32_t format) {
-	if (shader->format == format) {
-		glUseProgram(shader->program);
-		return true;
-	}
-	while (shader->next) {
-		shader = shader->next;
-		if (shader->format == format) {
-			glUseProgram(shader->program);
-			return true;
-		}
-	}
-	return false;
-}
-
-void wlr_shader_destroy(struct wlr_shader *shader) {
-	while (shader) {
-		struct wlr_shader *_shader = shader;
-		glDeleteProgram(shader->vert);
-		glDeleteProgram(shader->program);
-		shader = shader->next;
-		free(_shader);
-	}
-}
diff --git a/render/surface.c b/render/surface.c
deleted file mode 100644
index 930e118d..00000000
--- a/render/surface.c
+++ /dev/null
@@ -1,34 +0,0 @@
-#include <stdint.h>
-#include <stdlib.h>
-#include <assert.h>
-#include <GLES3/gl3.h>
-#include <wayland-util.h>
-#include <wayland-server-protocol.h>
-#include <wlr/render.h>
-#include <wlr/render/matrix.h>
-#include "render.h"
-
-struct wlr_surface *wlr_surface_init() {
-	return calloc(sizeof(struct wlr_surface), 1);
-}
-
-void wlr_surface_attach_pixels(struct wlr_surface *surf, uint32_t format,
-		int width, int height, const unsigned char *pixels) {
-	assert(surf);
-	surf->width = width;
-	surf->height = height;
-	surf->format = format;
-	// TODO: Error handling
-	glGenTextures(1, &surf->tex_id);
-	glBindTexture(GL_TEXTURE_2D, surf->tex_id);
-	glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0,
-			format, GL_UNSIGNED_BYTE, pixels);
-	surf->valid = true;
-}
-
-void wlr_surface_attach_shm(struct wlr_surface *surf, uint32_t format,
-		struct wl_shm_buffer *shm);
-
-void wlr_surface_destroy(struct wlr_surface *tex) {
-	// TODO
-}
diff --git a/render/wlr_renderer.c b/render/wlr_renderer.c
new file mode 100644
index 00000000..2fd2fd31
--- /dev/null
+++ b/render/wlr_renderer.c
@@ -0,0 +1,33 @@
+#include <stdlib.h>
+#include <stdbool.h>
+#include <wlr/render/interface.h>
+
+struct wlr_renderer *wlr_renderer_init(struct wlr_renderer_state *state,
+		struct wlr_renderer_impl *impl) {
+	struct wlr_renderer *r = calloc(sizeof(struct wlr_renderer), 1);
+	r->state = state;
+	r->impl = impl;
+	return r;
+}
+
+void wlr_renderer_destroy(struct wlr_renderer *r) {
+	r->impl->destroy(r->state);
+	free(r);
+}
+
+void wlr_renderer_begin(struct wlr_renderer *r, struct wlr_output *o) {
+	r->impl->begin(r->state, o);
+}
+
+void wlr_renderer_end(struct wlr_renderer *r) {
+	r->impl->end(r->state);
+}
+
+struct wlr_surface *wlr_render_surface_init(struct wlr_renderer *r) {
+	return r->impl->surface_init(r->state);
+}
+
+bool wlr_render_with_matrix(struct wlr_renderer *r,
+		struct wlr_surface *surface, const float (*matrix)[16]) {
+	return r->impl->render_with_matrix(r->state, surface, matrix);
+}
diff --git a/render/wlr_surface.c b/render/wlr_surface.c
new file mode 100644
index 00000000..46a12205
--- /dev/null
+++ b/render/wlr_surface.c
@@ -0,0 +1,36 @@
+#include <stdlib.h>
+#include <stdbool.h>
+#include <wlr/render/interface.h>
+
+struct wlr_surface *wlr_surface_init(struct wlr_surface_state *state,
+		struct wlr_surface_impl *impl) {
+	struct wlr_surface *s = calloc(sizeof(struct wlr_surface), 1);
+	s->state = state;
+	s->impl = impl;
+	return s;
+}
+
+void wlr_surface_destroy(struct wlr_surface *surface) {
+	surface->impl->destroy(surface->state);
+	free(surface);
+}
+
+void wlr_surface_bind(struct wlr_surface *surface) {
+	surface->impl->bind(surface->state);
+}
+
+bool wlr_surface_attach_pixels(struct wlr_surface *surface, uint32_t format,
+		int width, int height, const unsigned char *pixels) {
+	return surface->impl->attach_pixels(surface->state,
+			format, width, height, pixels);
+}
+
+bool wlr_surface_attach_shm(struct wlr_surface *surface, uint32_t format,
+		struct wl_shm_buffer *shm) {
+	return surface->impl->attach_shm(surface->state, format, shm);
+}
+
+void wlr_surface_get_matrix(struct wlr_surface *surface,
+		float (*matrix)[16], const float (*projection)[16], int x, int y) {
+	surface->impl->get_matrix(surface->state, matrix, projection, x, y);
+}