Add wlcore/wl_shm (WIP)

CMakeLists.txt

@@ -61,6 +61,7 @@ add_subdirectory(backend)
 add_subdirectory(types)
 add_subdirectory(session)
 add_subdirectory(render)
+add_subdirectory(wlcore)
 add_subdirectory(util)
 
 add_subdirectory(example)

example/CMakeLists.txt

@@ -65,3 +65,16 @@ target_link_libraries(tablet
     wlr-render
     ${XKBCOMMON_LIBRARIES}
 )
+
+add_executable(compositor
+    compositor
+    shared.c
+)
+
+target_link_libraries(compositor
+    wlr-backend
+    wlr-session
+    wlr-render
+    wlr-wlcore
+    ${XKBCOMMON_LIBRARIES}
+)

example/compositor.c

@@ -0,0 +1,43 @@
+#define _POSIX_C_SOURCE 199309L
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <inttypes.h>
+#include <wayland-server.h>
+#include <wlr/backend.h>
+#include <wlr/session.h>
+#include <wlr/render.h>
+#include <wlr/render/gles2.h>
+#include <wlr/types/wlr_output.h>
+#include <wlr/wlcore/wl_shm.h>
+#include <xkbcommon/xkbcommon.h>
+#include "shared.h"
+
+struct sample_state {
+	struct wlr_renderer *renderer;
+};
+
+void handle_output_frame(struct output_state *output, struct timespec *ts) {
+	struct compositor_state *state = output->compositor;
+	struct sample_state *sample = state->data;
+	struct wlr_output *wlr_output = output->output;
+
+	wlr_renderer_begin(sample->renderer, wlr_output);
+	// TODO: render surfaces
+	wlr_renderer_end(sample->renderer);
+}
+
+int main() {
+	struct sample_state state = { 0 };
+	struct compositor_state compositor = { 0,
+		.data = &state,
+		.output_frame_cb = handle_output_frame,
+	};
+	compositor_init(&compositor);
+
+	state.renderer = wlr_gles2_renderer_init();
+	wlr_wl_shm_init(compositor.display);
+
+	compositor_run(&compositor);
+}

example/shared.h

@@ -126,7 +126,6 @@ struct compositor_state {
 	struct wl_listener output_remove;
 	struct wl_list outputs;
 
-	bool exit;
 	void *data;
 };
 

include/endian.h

@@ -0,0 +1,8 @@
+#ifndef _WLR_ENDIAN_H
+#define _WLR_ENDIAN_H
+
+// https://stackoverflow.com/a/4240257
+
+#define little_endian() (((union { unsigned x; unsigned char c; }){1}).c)
+
+#endif

include/wlr/render.h

@@ -38,6 +38,11 @@ void wlr_render_colored_quad(struct wlr_renderer *r,
  */
 void wlr_render_colored_ellipse(struct wlr_renderer *r,
 		const float (*color)[4], const float (*matrix)[16]);
+/**
+ * Returns a list of pixel formats supported by this renderer.
+ */
+const enum wl_shm_format *wlr_renderer_get_formats(
+		struct wlr_renderer *r, size_t *len);
 /**
  * Destroys this wlr_renderer. Surfaces must be destroyed separately.
  */

include/wlr/render/interface.h

@@ -23,6 +23,8 @@ struct wlr_renderer_impl {
 		const float (*color)[4], const float (*matrix)[16]);
 	void (*render_ellipse)(struct wlr_renderer_state *state,
 		const float (*color)[4], const float (*matrix)[16]);
+	const enum wl_shm_format *(*formats)(
+		struct wlr_renderer_state *state, size_t *len);
 	void (*destroy)(struct wlr_renderer_state *state);
 };
 

include/wlr/wlcore/wl_shm.h

@@ -0,0 +1,13 @@
+#ifndef _WLR_WLCORE_WL_SHM_H
+#define _WLR_WLCORE_WL_SHM_H
+#include <wayland-server-core.h>
+#include <wlr/render.h>
+
+struct wlr_wl_shm;
+
+struct wlr_wl_shm *wlr_wl_shm_init(struct wl_display *display);
+void wlr_wl_shm_add_format(struct wlr_wl_shm *shm, enum wl_shm_format format);
+void wlr_wl_shm_add_renderer_formats(
+		struct wlr_wl_shm *shm, struct wlr_renderer *renderer);
+
+#endif

render/gles2/renderer.c

@@ -129,6 +129,7 @@ static void draw_quad() {
 static bool wlr_gles2_render_surface(struct wlr_renderer_state *state,
 		struct wlr_surface *surface, const float (*matrix)[16]) {
 	assert(surface && surface->valid);
+	// TODO: Convert GL formats to WL_SHM formats
 	switch (surface->format) {
 	case GL_RGB:
 		GL_CALL(glUseProgram(shaders.rgb));
@@ -163,6 +164,16 @@ static void wlr_gles2_render_ellipse(struct wlr_renderer_state *state,
 	draw_quad();
 }
 
+static const enum wl_shm_format *wlr_gles2_formats(
+		struct wlr_renderer_state *state, size_t *len) {
+	static enum wl_shm_format formats[] = {
+		WL_SHM_FORMAT_ARGB8888,
+		WL_SHM_FORMAT_XRGB8888,
+	};
+	*len = sizeof(formats) / sizeof(formats[0]);
+	return formats;
+}
+
 static void wlr_gles2_destroy(struct wlr_renderer_state *state) {
 	// no-op
 }
@@ -174,6 +185,7 @@ static struct wlr_renderer_impl wlr_renderer_impl = {
 	.render_with_matrix = wlr_gles2_render_surface,
 	.render_quad = wlr_gles2_render_quad,
 	.render_ellipse = wlr_gles2_render_ellipse,
+	.formats = wlr_gles2_formats,
 	.destroy = wlr_gles2_destroy
 };
 

render/wlr_renderer.c

@@ -41,3 +41,8 @@ void wlr_render_colored_ellipse(struct wlr_renderer *r,
 		const float (*color)[4], const float (*matrix)[16]) {
 	r->impl->render_ellipse(r->state, color, matrix);
 }
+
+const enum wl_shm_format *wlr_renderer_get_formats(
+		struct wlr_renderer *r, size_t *len) {
+	return r->impl->formats(r->state, len);
+}

wlcore/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_library(wlr-wlcore STATIC
+	wl_shm.c
+)

wlcore/wl_shm.c

@@ -0,0 +1,78 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <wayland-server.h>
+#include <wlr/wlcore/wl_shm.h>
+#include <wlr/util/list.h>
+#include <wlr/util/log.h>
+#include <wlr/render.h>
+
+struct wlr_wl_shm {
+	struct wl_global *wl_global;
+	struct wl_list resources;
+	struct wl_list pools;
+	list_t *formats;
+};
+
+static void wl_shm_destroy(struct wl_resource *resource) {
+	struct wlr_wl_shm *shm = wl_resource_get_user_data(resource);
+	struct wl_resource *_resource = NULL;
+	wl_resource_for_each(_resource, &shm->resources) {
+		if (_resource == resource) {
+			struct wl_list *link = wl_resource_get_link(_resource);
+			wl_list_remove(link);
+			break;
+		}
+	}
+}
+
+struct wl_shm_interface wl_shm_impl = {
+	//.create_pool = wl_shm_create_pool
+};
+
+static void wl_shm_bind(struct wl_client *wl_client, void *_wlr_wl_shm,
+		uint32_t version, uint32_t id) {
+	struct wlr_wl_shm *wlr_shm = _wlr_wl_shm;
+	assert(wl_client && wlr_shm);
+	if (version > 1) {
+		wlr_log(L_ERROR, "Client requested unsupported wl_shm version, disconnecting");
+		wl_client_destroy(wl_client);
+		return;
+	}
+	struct wl_resource *wl_resource = wl_resource_create(
+			wl_client, &wl_shm_interface, version, id);
+	wl_resource_set_implementation(wl_resource, &wl_shm_impl,
+			wlr_shm, wl_shm_destroy);
+	wl_list_insert(&wlr_shm->resources, wl_resource_get_link(wl_resource));
+	for (size_t i = 0; i < wlr_shm->formats->length; ++i) {
+		uint32_t *f = wlr_shm->formats->items[i];
+		wl_shm_send_format(wl_resource, *f);
+	}
+}
+
+struct wlr_wl_shm *wlr_wl_shm_init(struct wl_display *display) {
+	struct wlr_wl_shm *shm = calloc(1, sizeof(struct wlr_wl_shm));
+	wl_list_init(&shm->resources);
+	wl_list_init(&shm->pools);
+	shm->formats = list_create();
+	shm->wl_global = wl_global_create(display, &wl_shm_interface, 1,
+			shm, wl_shm_bind);
+	return shm;
+}
+
+void wlr_wl_shm_add_format(struct wlr_wl_shm *shm, enum wl_shm_format format) {
+	assert(shm);
+	uint32_t *f = calloc(1, sizeof(uint32_t));
+	*f = format;
+	list_add(shm->formats, f);
+}
+
+void wlr_wl_shm_add_renderer_formats(struct wlr_wl_shm *shm,
+		struct wlr_renderer *renderer) {
+	assert(shm && renderer);
+	size_t len;
+	const enum wl_shm_format *formats = wlr_renderer_get_formats(renderer, &len);
+	for (size_t i = 0; i < len; ++i) {
+		wlr_wl_shm_add_format(shm, formats[i]);
+	}
+}