1 files changed, 126 insertions, 0 deletions
diff --git a/backend/drm/renderer.c b/backend/drm/renderer.c
new file mode 100644
index 00000000..8afc6dca
--- /dev/null
+++ b/backend/drm/renderer.c
@@ -0,0 +1,126 @@
+#include <stdbool.h>
+
+#include <gbm.h>
+#include <GLES2/gl2.h>
+#include <EGL/egl.h>
+#include <EGL/eglext.h>
+
+#include <wlr/egl.h>
+#include <wlr/util/log.h>
+#include "backend/drm/drm.h"
+
+bool wlr_drm_renderer_init(struct wlr_drm_renderer *renderer, int fd) {
+	renderer->gbm = gbm_create_device(fd);
+	if (!renderer->gbm) {
+		wlr_log(L_ERROR, "Failed to create GBM device");
+		return false;
+	}
+
+	if (!wlr_egl_init(&renderer->egl, EGL_PLATFORM_GBM_MESA,
+			GBM_FORMAT_ARGB8888, renderer->gbm)) {
+		gbm_device_destroy(renderer->gbm);
+		return false;
+	}
+
+	renderer->fd = fd;
+	return true;
+}
+
+void wlr_drm_renderer_finish(struct wlr_drm_renderer *renderer) {
+	if (!renderer) {
+		return;
+	}
+
+	wlr_egl_free(&renderer->egl);
+	gbm_device_destroy(renderer->gbm);
+}
+
+bool wlr_drm_surface_init(struct wlr_drm_renderer *renderer,
+		struct wlr_drm_surface *surf, uint32_t width, uint32_t height,
+		uint32_t format, uint32_t flags) {
+	if (surf->width == width && surf->height == height) {
+		return true;
+	}
+
+	surf->width = width;
+	surf->height = height;
+
+	surf->gbm = gbm_surface_create(renderer->gbm, width, height,
+		format, GBM_BO_USE_RENDERING | flags);
+	if (!surf->gbm) {
+		wlr_log_errno(L_ERROR, "Failed to create GBM surface");
+		goto error_zero;
+	}
+
+	surf->egl = wlr_egl_create_surface(&renderer->egl, surf->gbm);
+	if (surf->egl == EGL_NO_SURFACE) {
+		wlr_log(L_ERROR, "Failed to create EGL surface");
+		goto error_gbm;
+	}
+
+	return true;
+
+error_gbm:
+	gbm_surface_destroy(surf->gbm);
+error_zero:
+	memset(surf, 0, sizeof(*surf));
+	return false;
+}
+
+void wlr_drm_surface_finish(struct wlr_drm_renderer *renderer,
+		struct wlr_drm_surface *surf) {
+	if (!renderer || !surf || !surf->gbm) {
+		return;
+	}
+
+	eglMakeCurrent(renderer->egl.display, EGL_NO_SURFACE, EGL_NO_SURFACE,
+		EGL_NO_CONTEXT);
+
+	if (surf->front) {
+		gbm_surface_release_buffer(surf->gbm, surf->front);
+	}
+	if (surf->back) {
+		gbm_surface_release_buffer(surf->gbm, surf->back);
+	}
+
+	if (surf->egl) {
+		eglDestroySurface(renderer->egl.display, surf->egl);
+	}
+	if (surf->gbm) {
+		gbm_surface_destroy(surf->gbm);
+	}
+
+	memset(surf, 0, sizeof(*surf));
+}
+
+void wlr_drm_surface_make_current(struct wlr_drm_renderer *renderer,
+		struct wlr_drm_surface *surf) {
+	eglMakeCurrent(renderer->egl.display, surf->egl, surf->egl,
+		renderer->egl.context);
+}
+
+struct gbm_bo *wlr_drm_surface_swap_buffers(struct wlr_drm_renderer *renderer,
+		struct wlr_drm_surface *surf) {
+	if (surf->front) {
+		gbm_surface_release_buffer(surf->gbm, surf->front);
+	}
+
+	eglSwapBuffers(renderer->egl.display, surf->egl);
+
+	surf->front = surf->back;
+	surf->back = gbm_surface_lock_front_buffer(surf->gbm);
+	return surf->back;
+}
+
+struct gbm_bo *wlr_drm_surface_get_front(struct wlr_drm_renderer *renderer,
+		struct wlr_drm_surface *surf) {
+	if (surf->front) {
+		return surf->front;
+	}
+
+	wlr_drm_surface_make_current(renderer, surf);
+	glViewport(0, 0, surf->width, surf->height);
+	glClearColor(0.0, 0.0, 0.0, 1.0);
+	glClear(GL_COLOR_BUFFER_BIT);
+	return wlr_drm_surface_swap_buffers(renderer, surf);
+}