diff options
| -rw-r--r-- | clients/simple-egl.c | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/clients/simple-egl.c b/clients/simple-egl.c index f4468b7a..54dfe936 100644 --- a/clients/simple-egl.c +++ b/clients/simple-egl.c @@ -36,6 +36,12 @@ #include <GLES2/gl2.h> #include <EGL/egl.h> +#include <EGL/eglext.h> + +#ifndef EGL_EXT_swap_buffers_with_damage +#define EGL_EXT_swap_buffers_with_damage 1 +typedef EGLBoolean (EGLAPIENTRYP PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC)(EGLDisplay dpy, EGLSurface surface, EGLint *rects, EGLint n_rects); +#endif struct window; struct seat; @@ -58,6 +64,8 @@ struct display { EGLConfig conf; } egl; struct window *window; + + PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC swap_buffers_with_damage; }; struct geometry { @@ -107,6 +115,7 @@ init_egl(struct display *display, int opaque) EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE }; + const char *extensions; EGLint config_attribs[] = { EGL_SURFACE_TYPE, EGL_WINDOW_BIT, @@ -141,6 +150,18 @@ init_egl(struct display *display, int opaque) EGL_NO_CONTEXT, context_attribs); assert(display->egl.ctx); + display->swap_buffers_with_damage = NULL; + extensions = eglQueryString(display->egl.dpy, EGL_EXTENSIONS); + if (extensions && + strstr(extensions, "EGL_EXT_swap_buffers_with_damage") && + strstr(extensions, "EGL_EXT_buffer_age")) + display->swap_buffers_with_damage = + (PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC) + eglGetProcAddress("eglSwapBuffersWithDamageEXT"); + + if (display->swap_buffers_with_damage) + printf("has EGL_EXT_buffer_age and EGL_EXT_swap_buffers_with_damage\n"); + } static void @@ -346,6 +367,7 @@ static void redraw(void *data, struct wl_callback *callback, uint32_t time) { struct window *window = data; + struct display *display = window->display; static const GLfloat verts[3][2] = { { -0.5, -0.5 }, { 0.5, -0.5 }, @@ -366,6 +388,8 @@ redraw(void *data, struct wl_callback *callback, uint32_t time) static const int32_t speed_div = 5; static uint32_t start_time = 0; struct wl_region *region; + EGLint rect[4]; + EGLint buffer_age = 0; assert(window->callback == callback); window->callback = NULL; @@ -385,6 +409,10 @@ redraw(void *data, struct wl_callback *callback, uint32_t time) rotation[2][0] = -sin(angle); rotation[2][2] = cos(angle); + if (display->swap_buffers_with_damage) + eglQuerySurface(display->egl.dpy, window->egl_surface, + EGL_BUFFER_AGE_EXT, &buffer_age); + glViewport(0, 0, window->geometry.width, window->geometry.height); glUniformMatrix4fv(window->gl.rotation_uniform, 1, GL_FALSE, @@ -417,7 +445,17 @@ redraw(void *data, struct wl_callback *callback, uint32_t time) window->callback = wl_surface_frame(window->surface); wl_callback_add_listener(window->callback, &frame_listener, window); - eglSwapBuffers(window->display->egl.dpy, window->egl_surface); + if (display->swap_buffers_with_damage && buffer_age > 0) { + rect[0] = window->geometry.width / 4 - 1; + rect[1] = window->geometry.height / 4 - 1; + rect[2] = window->geometry.width / 2 + 2; + rect[3] = window->geometry.height / 2 + 2; + display->swap_buffers_with_damage(display->egl.dpy, + window->egl_surface, + rect, 1); + } else { + eglSwapBuffers(display->egl.dpy, window->egl_surface); + } } static const struct wl_callback_listener frame_listener = { |