Add an EGL compositor. Still pretty lame.

Makefile

@@ -3,10 +3,12 @@ LDLIBS += $(shell pkg-config --libs libffi libdrm)
 
 all : wayland client
 
-wayland_objs = wayland.o event-loop.o connection.o hash.o compositor.o
+wayland_objs = wayland.o event-loop.o connection.o hash.o egl-compositor.o
+wayland : CFLAGS += -I../eagle
+wayland : LDLIBS += -L../eagle -leagle -ldl
 
 wayland : $(wayland_objs)
-	gcc -o $@ $(wayland_objs) $(LDLIBS)
+	gcc -o $@ $(LDLIBS) $(wayland_objs)
 
 libwayland_objs = wayland-client.o connection.o
 

client.c

@@ -112,7 +112,7 @@ int main(int argc, char *argv[])
 {
 	struct wl_display *display;
 	struct wl_surface *surface;
-	const int x = 400, y = 200, width = 300, height = 300;
+	const int x = 200, y = 100, width = 300, height = 300;
 	int fd, i, ret;
 	uint32_t name, mask;
 	cairo_surface_t *s;
@@ -141,9 +141,12 @@ int main(int argc, char *argv[])
 			  cairo_image_surface_get_stride(s));
 
 	i = 0;
-	while (ret = poll(p, 1, 40), ret >= 0) {
+	while (ret = poll(p, 1, 20), ret >= 0) {
 		if (ret == 0) {
-			wl_surface_map(surface, x + i, y + i, width, height);
+			wl_surface_map(surface, 
+				       x + cos(i / 10.0) * 50,
+				       y + sin(i / 10.0) * 50,
+				       width, height);
 			i++;
 			continue;
 		}

egl-compositor.c

@@ -0,0 +1,251 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <i915_drm.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/fb.h>
+
+#include "wayland.h"
+
+#include <GL/gl.h>
+#include <eagle.h>
+
+#define ARRAY_LENGTH(a) (sizeof (a) / sizeof (a)[0])
+
+struct egl_compositor {
+	struct wl_compositor base;
+	EGLDisplay display;
+	EGLSurface surface;
+	EGLContext context;
+	int gem_fd;
+};
+
+struct surface_data {
+	uint32_t handle;
+	int32_t width, height, stride;
+	GLuint texture;
+};
+
+void notify_surface_create(struct wl_compositor *compositor,
+			   struct wl_surface *surface)
+{
+	struct surface_data *sd;
+
+	sd = malloc(sizeof *sd);
+	if (sd == NULL)
+		return;
+
+	sd->handle = 0;
+	wl_surface_set_data(surface, sd);
+
+	glGenTextures(1, &sd->texture);
+}
+				   
+void notify_surface_destroy(struct wl_compositor *compositor,
+			    struct wl_surface *surface)
+{
+	struct egl_compositor *ec = (struct egl_compositor *) compositor;
+	struct surface_data *sd;
+	struct drm_gem_close close_arg;
+	int ret;
+
+	sd = wl_surface_get_data(surface);
+	if (sd == NULL || sd->handle == 0)
+		return;
+	
+	close_arg.handle = sd->handle;
+	ret = ioctl(ec->gem_fd, DRM_IOCTL_GEM_CLOSE, &close_arg);
+	if (ret != 0) {
+		fprintf(stderr, "failed to gem_close handle %d: %m\n", sd->handle);
+	}
+
+	glDeleteTextures(1, &sd->texture);
+
+	free(sd);
+}
+
+void notify_surface_attach(struct wl_compositor *compositor,
+			   struct wl_surface *surface, uint32_t name, 
+			   uint32_t width, uint32_t height, uint32_t stride)
+{
+	struct egl_compositor *ec = (struct egl_compositor *) compositor;
+	struct surface_data *sd;
+	struct drm_gem_open open_arg;
+	struct drm_gem_close close_arg;
+	struct drm_i915_gem_pread pread;
+	void *data;
+	uint32_t size;
+	int ret;
+
+	sd = wl_surface_get_data(surface);
+	if (sd == NULL)
+		return;
+
+	if (sd->handle != 0) {
+		close_arg.handle = sd->handle;
+		ret = ioctl(ec->gem_fd, DRM_IOCTL_GEM_CLOSE, &close_arg);
+		if (ret != 0) {
+			fprintf(stderr, "failed to gem_close name %d: %m\n", name);
+		}
+	}
+
+	open_arg.name = name;
+	ret = ioctl(ec->gem_fd, DRM_IOCTL_GEM_OPEN, &open_arg);
+	if (ret != 0) {
+		fprintf(stderr, "failed to gem_open name %d, fd=%d: %m\n", name, ec->gem_fd);
+		return;
+	}
+
+	sd->handle = open_arg.handle;
+	sd->width = width;
+	sd->height = height;
+	sd->stride = stride;
+
+	size = sd->height * sd->stride;
+	data = malloc(size);
+	if (data == NULL) {
+		fprintf(stderr, "swap buffers malloc failed\n");
+		return;
+	}
+
+	pread.handle = sd->handle;
+	pread.pad = 0;
+	pread.offset = 0;
+	pread.size = size;
+	pread.data_ptr = (long) data;
+
+	if (ioctl(ec->gem_fd, DRM_IOCTL_I915_GEM_PREAD, &pread)) {
+		fprintf(stderr, "gem pread failed");
+		return;
+	}
+
+	glBindTexture(GL_TEXTURE_2D, sd->texture);
+	glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
+		     GL_BGRA, GL_UNSIGNED_BYTE, data);
+
+	free(data);
+}
+
+void notify_surface_map(struct wl_compositor *compositor,
+			struct wl_surface *surface, struct wl_map *map)
+{
+	struct egl_compositor *ec = (struct egl_compositor *) compositor;
+	struct surface_data *sd;
+	GLint vertices[12] = {
+		map->x, map->y, 0.0,
+		map->x, map->y + map->height, 0.0,
+		map->x + map->width, map->y + map->height, 0.0,
+		map->x + map->width, map->y, 0.0
+	};
+	GLint tex_coords[8] = {
+		1, 0,
+		1, 1,
+		0, 1,
+		0, 0
+	};
+	GLuint indices[4] = { 0, 1, 2, 3 };
+
+	/* This part is where we actually copy the buffer to screen.
+	 * Needs to be part of the repaint loop, not in the notify_map
+	 * handler. */
+
+	sd = wl_surface_get_data(surface);
+	if (sd == NULL)
+		return;
+
+	glClear(GL_COLOR_BUFFER_BIT); 
+	glBindTexture(GL_TEXTURE_2D, sd->texture);
+	glEnable(GL_TEXTURE_2D);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	glEnableClientState(GL_VERTEX_ARRAY);
+	glEnableClientState(GL_TEXTURE_COORD_ARRAY);
+	glVertexPointer(3, GL_INT, 0, vertices);
+	glTexCoordPointer(2, GL_INT, 0, tex_coords);
+	glDrawElements(GL_QUADS, 4, GL_UNSIGNED_INT, indices);
+
+	glFlush();
+
+	eglSwapBuffers(ec->display, ec->surface);
+}
+
+struct wl_compositor_interface interface = {
+	notify_surface_create,
+	notify_surface_destroy,
+	notify_surface_attach,
+	notify_surface_map
+};
+
+static const char gem_device[] = "/dev/dri/card0";
+
+struct wl_compositor *
+wl_compositor_create(void)
+{
+	EGLConfig configs[64];
+	EGLint major, minor, count;
+	struct egl_compositor *ec;
+	const int width = 800, height = 600;
+
+	ec = malloc(sizeof *ec);
+	if (ec == NULL)
+		return NULL;
+
+	ec->base.interface = &interface;
+
+	ec->display = eglCreateDisplay(gem_device, "i965");
+	if (ec->display == NULL) {
+		fprintf(stderr, "failed to create display\n");
+		return NULL;
+	}
+
+	if (!eglInitialize(ec->display, &major, &minor)) {
+		fprintf(stderr, "failed to initialize display\n");
+		return NULL;
+	}
+
+	if (!eglGetConfigs(ec->display, configs, ARRAY_LENGTH(configs), &count)) {
+		fprintf(stderr, "failed to get configs\n");
+		return NULL;
+	}
+
+	ec->surface = eglCreateSurface(ec->display, configs[24], 0, 0, width, height);
+	if (ec->surface == NULL) {
+		fprintf(stderr, "failed to create surface\n");
+		return NULL;
+	}
+
+	ec->context = eglCreateContext(ec->display, configs[24], NULL, NULL);
+	if (ec->context == NULL) {
+		fprintf(stderr, "failed to create context\n");
+		return NULL;
+	}
+
+	if (!eglMakeCurrent(ec->display, ec->surface, ec->surface, ec->context)) {
+		fprintf(stderr, "failed to make context current\n");
+		return NULL;
+	}
+
+	glViewport(0, 0, width, height);
+	glMatrixMode(GL_PROJECTION);
+	glLoadIdentity();
+	glOrtho(0, width, height, 0, 0, 1000.0);
+	glMatrixMode(GL_MODELVIEW);
+	glClearColor(0.0, 0.1, 0.3, 0.0);
+
+	ec->gem_fd = open(gem_device, O_RDWR);
+	if (ec->gem_fd < 0) {
+		fprintf(stderr, "failed to open drm device\n");
+		return NULL;
+	}
+
+	return &ec->base;
+}