Merge pull request #53 from nyorain/drm_buffer

Implement drm (egl) buffer attaching

1 files changed, 243 insertions, 0 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;
+}