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#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);
}
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