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Improvement: --glx-use-copysubbuffermesa

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- GLX backend: Add --glx-use-copysubbuffermesa, to use
  MESA_copy_sub_buffer to do partial screen update. Huge performance
  boost on mesa drivers for partial screen updates, but does not work
  for nvidia-drivers and may break VSync. Automagically overrides
  --glx-copy-from-front.

- Add rect_is_fullscreen() to reuse code. Misc changes.
This commit is contained in:
Richard Grenville
2013-03-21 13:05:56 +08:00
parent 8208ec6dc8
commit 4b734c1fa1
6 changed files with 100 additions and 14 deletions
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48
src/opengl.c
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@@ -96,6 +96,15 @@ glx_init(session_t *ps, bool need_render) {
printf_errf("(): Failed to acquire glXBindTexImageEXT() / glXReleaseTexImageEXT().");
goto glx_init_end;
}
if (ps->o.glx_use_copysubbuffermesa) {
ps->glXCopySubBufferProc = (f_CopySubBuffer)
glXGetProcAddress((const GLubyte *) "glXCopySubBufferMESA");
if (!ps->glXCopySubBufferProc) {
printf_errf("(): Failed to acquire glXCopySubBufferMESA().");
goto glx_init_end;
}
}
}
// Acquire FBConfigs
@@ -543,10 +552,13 @@ void
glx_paint_pre(session_t *ps, XserverRegion *preg) {
ps->glx_z = 0.0;
// glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// OpenGL doesn't support partial repaint without GLX_MESA_copy_sub_buffer,
// we currently redraw the whole screen or copy unmodified pixels from
// we could redraw the whole screen or copy unmodified pixels from
// front buffer with --glx-copy-from-front.
if (!ps->o.glx_copy_from_front || !*preg) {
if (ps->o.glx_use_copysubbuffermesa || !*preg) {
}
else if (!ps->o.glx_copy_from_front) {
free_region(ps, preg);
}
else {
@@ -612,7 +624,6 @@ glx_set_clip(session_t *ps, XserverRegion reg) {
glDepthMask(GL_FALSE);
glStencilOp(GL_REPLACE, GL_KEEP, GL_KEEP);
glBegin(GL_QUADS);
for (int i = 0; i < nrects; ++i) {
@@ -853,6 +864,37 @@ glx_render(session_t *ps, const glx_texture_t *ptex,
return true;
}
/**
* Swap buffer with glXCopySubBufferMESA().
*/
void
glx_swap_copysubbuffermesa(session_t *ps, XserverRegion reg) {
int nrects = 0;
XRectangle *rects = XFixesFetchRegion(ps->dpy, reg, &nrects);
if (1 == nrects && rect_is_fullscreen(ps, rects[0].x, rects[0].y,
rects[0].width, rects[0].height)) {
glXSwapBuffers(ps->dpy, get_tgt_window(ps));
}
else {
glx_set_clip(ps, None);
for (int i = 0; i < nrects; ++i) {
const int x = rects[i].x;
const int y = ps->root_height - rects[i].y - rects[i].height;
const int wid = rects[i].width;
const int hei = rects[i].height;
#ifdef DEBUG_GLX
printf_dbgf("(): %d, %d, %d, %d\n", x, y, wid, hei);
#endif
ps->glXCopySubBufferProc(ps->dpy, get_tgt_window(ps), x, y, wid, hei);
}
}
if (rects)
XFree(rects);
}
#ifdef CONFIG_VSYNC_OPENGL_GLSL
GLuint
glx_create_shader(GLenum shader_type, const char *shader_str) {