Refactor EGL handling

5 files changed, 288 insertions, 23 deletions

diff --git a/render/egl.c b/render/egl.c
new file mode 100644
index 00000000..73680d1d
--- /dev/null
+++ b/render/egl.c
@@ -0,0 +1,243 @@
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+#include <GLES2/gl2.h>
+#include <gbm.h> // GBM_FORMAT_XRGB8888
+#include <stdlib.h>
+#include <wlr/util/log.h>
+#include <wlr/egl.h>
+
+// Extension documentation
+// https://www.khronos.org/registry/EGL/extensions/KHR/EGL_KHR_image_base.txt.
+// https://cgit.freedesktop.org/mesa/mesa/tree/docs/specs/WL_bind_wayland_display.spec
+
+const char *egl_error(void) {
+	switch (eglGetError()) {
+	case EGL_SUCCESS:
+		return "Success";
+	case EGL_NOT_INITIALIZED:
+		return "Not initialized";
+	case EGL_BAD_ACCESS:
+		return "Bad access";
+	case EGL_BAD_ALLOC:
+		return "Bad alloc";
+	case EGL_BAD_ATTRIBUTE:
+		return "Bad attribute";
+	case EGL_BAD_CONTEXT:
+		return "Bad Context";
+	case EGL_BAD_CONFIG:
+		return "Bad Config";
+	case EGL_BAD_CURRENT_SURFACE:
+		return "Bad current surface";
+	case EGL_BAD_DISPLAY:
+		return "Bad display";
+	case EGL_BAD_SURFACE:
+		return "Bad surface";
+	case EGL_BAD_MATCH:
+		return "Bad match";
+	case EGL_BAD_PARAMETER:
+		return "Bad parameter";
+	case EGL_BAD_NATIVE_PIXMAP:
+		return "Bad native pixmap";
+	case EGL_BAD_NATIVE_WINDOW:
+		return "Bad native window";
+	case EGL_CONTEXT_LOST:
+		return "Context lost";
+	default:
+		return "Unknown";
+	}
+}
+
+static bool egl_exts(struct wlr_egl *egl) {
+	egl->get_platform_display = (PFNEGLGETPLATFORMDISPLAYEXTPROC)
+		eglGetProcAddress("eglGetPlatformDisplayEXT");
+
+	if (!egl->get_platform_display) {
+		wlr_log(L_ERROR, "Failed to load EGL extension 'eglGetPlatformDisplayEXT'");
+		return false;
+	}
+
+	egl->create_platform_window_surface = (PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC)
+		eglGetProcAddress("eglCreatePlatformWindowSurfaceEXT");
+
+	if (!egl->get_platform_display) {
+		wlr_log(L_ERROR,
+			"Failed to load EGL extension 'eglCreatePlatformWindowSurfaceEXT'");
+		return false;
+	}
+
+	return true;
+}
+
+static bool egl_get_config(EGLDisplay disp, EGLConfig *out, EGLenum platform) {
+	EGLint count = 0, matched = 0, ret;
+
+	ret = eglGetConfigs(disp, NULL, 0, &count);
+	if (ret == EGL_FALSE || count == 0) {
+		wlr_log(L_ERROR, "eglGetConfigs returned no configs");
+		return false;
+	}
+
+	EGLConfig configs[count];
+
+	ret = eglChooseConfig(disp, NULL, configs, count, &matched);
+	if (ret == EGL_FALSE) {
+		wlr_log(L_ERROR, "eglChooseConfig failed");
+		return false;
+	}
+
+	for (int i = 0; i < matched; ++i) {
+		EGLint gbm_format;
+
+		if (platform == EGL_PLATFORM_WAYLAND_EXT) {
+			*out = configs[i];
+			return true;
+		}
+
+		if (!eglGetConfigAttrib(disp,
+					configs[i],
+					EGL_NATIVE_VISUAL_ID,
+					&gbm_format)) {
+			continue;
+		}
+
+		if (gbm_format == GBM_FORMAT_ARGB8888) {
+			*out = configs[i];
+			return true;
+		}
+	}
+
+	wlr_log(L_ERROR, "no valid egl config found");
+	return false;
+}
+
+bool wlr_egl_init(struct wlr_egl *egl, EGLenum platform,
+		void *remote_display) {
+	if (!egl_exts(egl)) {
+		return false;
+	}
+
+	if (eglBindAPI(EGL_OPENGL_ES_API) == EGL_FALSE) {
+		wlr_log(L_ERROR, "Failed to bind to the OpenGL ES API: %s", egl_error());
+		goto error;
+	}
+
+	egl->display = egl->get_platform_display(platform, remote_display, NULL);
+	if (egl->display == EGL_NO_DISPLAY) {
+		wlr_log(L_ERROR, "Failed to create EGL display: %s", egl_error());
+		goto error;
+	}
+
+	EGLint major, minor;
+	if (eglInitialize(egl->display, &major, &minor) == EGL_FALSE) {
+		wlr_log(L_ERROR, "Failed to initialize EGL: %s", egl_error());
+		goto error;
+	}
+
+	if (!egl_get_config(egl->display, &egl->config, platform)) {
+		wlr_log(L_ERROR, "Failed to get EGL config");
+		goto error;
+	}
+
+	static const EGLint attribs[] = {EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE};
+
+	egl->context = eglCreateContext(egl->display, egl->config,
+		EGL_NO_CONTEXT, attribs);
+
+	if (egl->context == EGL_NO_CONTEXT) {
+		wlr_log(L_ERROR, "Failed to create EGL context: %s", egl_error());
+		goto error;
+	}
+
+	eglMakeCurrent(egl->display, EGL_NO_SURFACE, EGL_NO_SURFACE, egl->context);
+	egl->egl_exts = eglQueryString(egl->display, EGL_EXTENSIONS);
+	if (strstr(egl->egl_exts, "EGL_WL_bind_wayland_display") == NULL ||
+		strstr(egl->egl_exts, "EGL_KHR_image_base") == NULL) {
+		wlr_log(L_ERROR, "Required egl extensions not supported");
+		goto error;
+	}
+
+	egl->eglCreateImageKHR = (PFNEGLCREATEIMAGEKHRPROC)
+		eglGetProcAddress("eglCreateImageKHR");
+	egl->eglDestroyImageKHR = (PFNEGLDESTROYIMAGEKHRPROC)
+		eglGetProcAddress("eglDestroyImageKHR");
+	egl->eglQueryWaylandBufferWL = (PFNEGLQUERYWAYLANDBUFFERWL)
+		(void*) eglGetProcAddress("eglQueryWaylandBufferWL");
+	egl->eglBindWaylandDisplayWL = (PFNEGLBINDWAYLANDDISPLAYWL)
+		(void*) eglGetProcAddress("eglBindWaylandDisplayWL");
+	egl->eglUnbindWaylandDisplayWL = (PFNEGLUNBINDWAYLANDDISPLAYWL)
+		(void*) eglGetProcAddress("eglUnbindWaylandDisplayWL");
+
+	egl->gl_exts = (const char*) glGetString(GL_EXTENSIONS);
+	wlr_log(L_INFO, "Using EGL %d.%d", (int)major, (int)minor);
+	wlr_log(L_INFO, "Supported EGL extensions: %s", egl->egl_exts);
+	wlr_log(L_INFO, "Using %s", glGetString(GL_VERSION));
+	wlr_log(L_INFO, "Supported OpenGL ES extensions: %s", egl->gl_exts);
+	return true;
+
+error:
+	eglTerminate(egl->display);
+	eglReleaseThread();
+	eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+	return false;
+}
+
+void wlr_egl_free(struct wlr_egl *egl) {
+	if (egl->wl_display && egl->eglUnbindWaylandDisplayWL) {
+		egl->eglUnbindWaylandDisplayWL(egl->display, egl->wl_display);
+	}
+
+	eglDestroyContext(egl->display, egl->context);
+	eglTerminate(egl->display);
+	eglReleaseThread();
+	eglMakeCurrent(EGL_NO_DISPLAY, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT);
+}
+
+bool wlr_egl_bind_display(struct wlr_egl *egl, struct wl_display *local_display) {
+	if (!egl->eglBindWaylandDisplayWL) {
+		return false;
+	}
+
+	if (egl->eglBindWaylandDisplayWL(egl->display, local_display)) {
+		egl->wl_display = local_display;
+		return true;
+	}
+
+	return false;
+}
+
+bool wlr_egl_query_buffer(struct wlr_egl *egl, struct wl_resource *buf,
+		int attrib, int *value) {
+	if (!egl->eglQueryWaylandBufferWL) {
+		return false;
+	}
+	return egl->eglQueryWaylandBufferWL(egl->display, buf, attrib, value);
+}
+
+EGLImage wlr_egl_create_image(struct wlr_egl *egl, EGLenum target,
+		EGLClientBuffer buffer, const EGLint *attribs) {
+	if (!egl->eglCreateImageKHR) {
+		return false;
+	}
+
+	return egl->eglCreateImageKHR(egl->display, egl->context, target,
+		buffer, attribs);
+}
+
+bool wlr_egl_destroy_image(struct wlr_egl *egl, EGLImage image) {
+	if (!egl->eglDestroyImageKHR) {
+		return false;
+	}
+
+	egl->eglDestroyImageKHR(egl->display, image);
+	return true;
+}
+
+EGLSurface wlr_egl_create_surface(struct wlr_egl *egl, void *window) {
+	EGLSurface surf = egl->create_platform_window_surface(egl->display, egl->config,
+		window, NULL);
+	if (surf == EGL_NO_SURFACE) {
+		wlr_log(L_ERROR, "Failed to create EGL surface: %s", egl_error());
+		return EGL_NO_SURFACE;
+	}
+	return surf;
+}
diff --git a/render/gles2/renderer.c b/render/gles2/renderer.c
index 0de777cc..237dc67b 100644
--- a/render/gles2/renderer.c
+++ b/render/gles2/renderer.c
@@ -5,11 +5,12 @@
 #include <GLES2/gl2ext.h>
 #include <wayland-util.h>
 #include <wayland-server-protocol.h>
+#include <wlr/egl.h>
+#include <wlr/backend.h>
 #include <wlr/render.h>
 #include <wlr/render/interface.h>
 #include <wlr/render/matrix.h>
 #include <wlr/util/log.h>
-#include "backend/egl.h"
 #include "render/gles2.h"
 
 PFNGLEGLIMAGETARGETTEXTURE2DOESPROC glEGLImageTargetTexture2DOES = NULL;
@@ -123,7 +124,7 @@ static void wlr_gles2_end(struct wlr_renderer_state *state) {
 }
 
 static struct wlr_texture *wlr_gles2_texture_init(struct wlr_renderer_state *state) {
-	return gles2_texture_init();
+	return gles2_texture_init(state->egl);
 }
 
 static void draw_quad() {
@@ -195,8 +196,14 @@ static const enum wl_shm_format *wlr_gles2_formats(
 	return formats;
 }
 
+static bool wlr_gles2_buffer_is_drm(struct wlr_renderer_state *state,
+		struct wl_resource *buffer) {
+	EGLint format;
+	return wlr_egl_query_buffer(state->egl, buffer, EGL_TEXTURE_FORMAT, &format);
+}
+
 static void wlr_gles2_destroy(struct wlr_renderer_state *state) {
-	// no-op
+	free(state);
 }
 
 static struct wlr_renderer_impl wlr_renderer_impl = {
@@ -207,10 +214,16 @@ static struct wlr_renderer_impl wlr_renderer_impl = {
 	.render_quad = wlr_gles2_render_quad,
 	.render_ellipse = wlr_gles2_render_ellipse,
 	.formats = wlr_gles2_formats,
+	.buffer_is_drm = wlr_gles2_buffer_is_drm,
 	.destroy = wlr_gles2_destroy
 };
 
-struct wlr_renderer *wlr_gles2_renderer_init(struct wlr_egl *egl) {
+struct wlr_renderer *wlr_gles2_renderer_init(struct wlr_backend *backend) {
 	init_globals();
-	return wlr_renderer_init(NULL, &wlr_renderer_impl);
+	struct wlr_egl *egl = wlr_backend_get_egl(backend);
+	struct wlr_renderer_state *state = calloc(1, sizeof(struct wlr_renderer_state));
+	struct wlr_renderer *renderer = wlr_renderer_init(state, &wlr_renderer_impl);
+	state->renderer = renderer;
+	state->egl = egl;
+	return renderer;
 }
diff --git a/render/gles2/texture.c b/render/gles2/texture.c
index 2a2073c6..f2c88af5 100644
--- a/render/gles2/texture.c
+++ b/render/gles2/texture.c
@@ -5,12 +5,12 @@
 #include <GLES2/gl2ext.h>
 #include <wayland-util.h>
 #include <wayland-server-protocol.h>
+#include <wlr/egl.h>
 #include <wlr/render.h>
 #include <wlr/render/interface.h>
 #include <wlr/render/matrix.h>
 #include <wlr/util/log.h>
 #include "render/gles2.h"
-#include "backend/egl.h"
 
 static struct pixel_format external_pixel_format = {
 	.wl_format = 0,
@@ -139,23 +139,25 @@ static bool gles2_texture_update_shm(struct wlr_texture_state *texture,
 	return true;
 }
 
-static bool gles2_texture_upload_drm(struct wlr_texture_state *texture,
-		struct wl_resource* buf) {
+static bool gles2_texture_upload_drm(struct wlr_texture_state *tex,
+		struct wl_resource *buf) {
 	if (!glEGLImageTargetTexture2DOES) {
 		return false;
 	}
 
 	EGLint format;
-	if (!wlr_egl_query_buffer(buf, EGL_TEXTURE_FORMAT, &format)) {
+	if (!wlr_egl_query_buffer(tex->egl, buf, EGL_TEXTURE_FORMAT, &format)) {
 		wlr_log(L_INFO, "upload_drm called with no drm buffer");
 		return false;
 	}
 
-	wlr_egl_query_buffer(buf, EGL_WIDTH, (EGLint*) &texture->wlr_texture->width);
-	wlr_egl_query_buffer(buf, EGL_HEIGHT, (EGLint*) &texture->wlr_texture->height);
+	wlr_egl_query_buffer(tex->egl, buf, EGL_WIDTH,
+			(EGLint*)&tex->wlr_texture->width);
+	wlr_egl_query_buffer(tex->egl, buf, EGL_HEIGHT,
+			(EGLint*)&tex->wlr_texture->height);
 
 	EGLint inverted_y;
-	wlr_egl_query_buffer(buf, EGL_WAYLAND_Y_INVERTED_WL, &inverted_y);
+	wlr_egl_query_buffer(tex->egl, buf, EGL_WAYLAND_Y_INVERTED_WL, &inverted_y);
 
 	GLenum target;
 	const struct pixel_format *pf;
@@ -174,22 +176,22 @@ static bool gles2_texture_upload_drm(struct wlr_texture_state *texture,
 		return false;
 	}
 
-	gles2_texture_gen_texture(texture);
-	GL_CALL(glBindTexture(GL_TEXTURE_2D, texture->tex_id));
+	gles2_texture_gen_texture(tex);
+	GL_CALL(glBindTexture(GL_TEXTURE_2D, tex->tex_id));
 
 	EGLint attribs[] = { EGL_WAYLAND_PLANE_WL, 0, EGL_NONE };
-	texture->image = wlr_egl_create_image(EGL_WAYLAND_BUFFER_WL,
+	tex->image = wlr_egl_create_image(tex->egl, EGL_WAYLAND_BUFFER_WL,
 		(EGLClientBuffer*) buf, attribs);
-	if (!texture->image) {
+	if (!tex->image) {
 		wlr_log(L_ERROR, "failed to create egl image: %s", egl_error());
  		return false;
 	}
 
 	GL_CALL(glActiveTexture(GL_TEXTURE0));
-	GL_CALL(glBindTexture(target, texture->tex_id));
-	GL_CALL(glEGLImageTargetTexture2DOES(target, texture->image));
-	texture->wlr_texture->valid = true;
-	texture->pixel_format = pf;
+	GL_CALL(glBindTexture(target, tex->tex_id));
+	GL_CALL(glEGLImageTargetTexture2DOES(target, tex->image));
+	tex->wlr_texture->valid = true;
+	tex->pixel_format = pf;
 
 	return true;
 }
@@ -230,10 +232,11 @@ static struct wlr_texture_impl wlr_texture_impl = {
 	.destroy = gles2_texture_destroy,
 };
 
-struct wlr_texture *gles2_texture_init() {
+struct wlr_texture *gles2_texture_init(struct wlr_egl *egl) {
 	struct wlr_texture_state *state = calloc(sizeof(struct wlr_texture_state), 1);
 	struct wlr_texture *texture = wlr_texture_init(state, &wlr_texture_impl);
 	state->wlr_texture = texture;
+	state->egl = egl;
 	wl_signal_init(&texture->destroy_signal);
 	return texture;
 }
diff --git a/render/meson.build b/render/meson.build
index 93bf8b4b..a0a44ea2 100644
--- a/render/meson.build
+++ b/render/meson.build
@@ -1,10 +1,11 @@
 wlr_files += files(
+    'egl.c',
     'matrix.c',
-    'wlr_renderer.c',
-    'wlr_texture.c',
     'gles2/pixel_format.c',
     'gles2/renderer.c',
     'gles2/shaders.c',
     'gles2/texture.c',
     'gles2/util.c',
+    'wlr_renderer.c',
+    'wlr_texture.c',
 )
diff --git a/render/wlr_renderer.c b/render/wlr_renderer.c
index 8418fd5b..640d737e 100644
--- a/render/wlr_renderer.c
+++ b/render/wlr_renderer.c
@@ -46,3 +46,8 @@ const enum wl_shm_format *wlr_renderer_get_formats(
 		struct wlr_renderer *r, size_t *len) {
 	return r->impl->formats(r->state, len);
 }
+
+bool wlr_renderer_buffer_is_drm(struct wlr_renderer *r,
+		struct wl_resource *buffer) {
+	return r->impl->buffer_is_drm(r->state, buffer);
+}