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#include "window_texture.h"
#include <X11/extensions/Xcomposite.h>
#include <stdio.h>
static int x11_supports_composite_named_window_pixmap(Display *display) {
int extension_major;
int extension_minor;
if(!XCompositeQueryExtension(display, &extension_major, &extension_minor))
return 0;
int major_version;
int minor_version;
return XCompositeQueryVersion(display, &major_version, &minor_version) && (major_version > 0 || minor_version >= 2);
}
int window_texture_init(WindowTexture *window_texture, Display *display, Window window) {
window_texture->display = display;
window_texture->window = window;
window_texture->pixmap = None;
window_texture->glx_pixmap = None;
window_texture->texture_id = 0;
window_texture->redirected = 0;
if(!x11_supports_composite_named_window_pixmap(display))
return 1;
XCompositeRedirectWindow(display, window, CompositeRedirectAutomatic);
window_texture->redirected = 1;
return window_texture_on_resize(window_texture);
}
static void window_texture_cleanup(WindowTexture *self, int delete_texture) {
if(delete_texture && self->texture_id) {
glDeleteTextures(1, &self->texture_id);
self->texture_id = 0;
}
if(self->glx_pixmap) {
glXDestroyPixmap(self->display, self->glx_pixmap);
glXReleaseTexImageEXT(self->display, self->glx_pixmap, GLX_FRONT_EXT);
self->glx_pixmap = None;
}
if(self->pixmap) {
XFreePixmap(self->display, self->pixmap);
self->pixmap = None;
}
}
void window_texture_deinit(WindowTexture *self) {
if(self->redirected) {
XCompositeUnredirectWindow(self->display, self->window, CompositeRedirectAutomatic);
self->redirected = 0;
}
window_texture_cleanup(self, 1);
}
int window_texture_on_resize(WindowTexture *self) {
window_texture_cleanup(self, 0);
int result = 0;
GLXFBConfig *configs = NULL;
Pixmap pixmap = None;
GLXPixmap glx_pixmap = None;
GLuint texture_id = 0;
int glx_pixmap_bound = 0;
const int pixmap_config[] = {
GLX_BIND_TO_TEXTURE_RGBA_EXT, True,
GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT | GLX_WINDOW_BIT,
GLX_BIND_TO_TEXTURE_TARGETS_EXT, GLX_TEXTURE_2D_BIT_EXT,
/*GLX_BIND_TO_MIPMAP_TEXTURE_EXT, True,*/
GLX_DOUBLEBUFFER, False,
GLX_BUFFER_SIZE, 32,
GLX_ALPHA_SIZE, 8,
None
};
const int pixmap_attribs[] = {
GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
GLX_TEXTURE_FORMAT_EXT, GLX_TEXTURE_FORMAT_RGB_EXT,
/*GLX_MIPMAP_TEXTURE_EXT, True,*/
None
};
XWindowAttributes attr;
if (!XGetWindowAttributes(self->display, self->window, &attr)) {
fprintf(stderr, "Failed to get window attributes\n");
return 1;
}
GLXFBConfig config;
int c;
configs = glXChooseFBConfig(self->display, 0, pixmap_config, &c);
if(!configs) {
fprintf(stderr, "Failed to choose fb config\n");
return 1;
}
int found = 0;
for (int i = 0; i < c; i++) {
config = configs[i];
XVisualInfo *visual = glXGetVisualFromFBConfig(self->display, config);
if (!visual)
continue;
if (attr.depth != visual->depth) {
XFree(visual);
continue;
}
XFree(visual);
found = 1;
break;
}
if(!found) {
fprintf(stderr, "No matching fb config found\n");
result = 1;
goto cleanup;
}
pixmap = XCompositeNameWindowPixmap(self->display, self->window);
if(!pixmap) {
result = 2;
goto cleanup;
}
glx_pixmap = glXCreatePixmap(self->display, config, pixmap, pixmap_attribs);
if(!glx_pixmap) {
result = 3;
goto cleanup;
}
if(self->texture_id == 0) {
glGenTextures(1, &texture_id);
if(texture_id == 0) {
result = 4;
goto cleanup;
}
glBindTexture(GL_TEXTURE_2D, texture_id);
} else {
glBindTexture(GL_TEXTURE_2D, self->texture_id);
}
glXBindTexImageEXT(self->display, glx_pixmap, GLX_FRONT_EXT, NULL);
glx_pixmap_bound = 1;
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
float fLargest = 0.0f;
glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, &fLargest);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, fLargest);
glBindTexture(GL_TEXTURE_2D, 0);
XFree(configs);
self->pixmap = pixmap;
self->glx_pixmap = glx_pixmap;
if(texture_id != 0)
self->texture_id = texture_id;
return 0;
cleanup:
if(texture_id != 0) glDeleteTextures(1, &texture_id);
if(glx_pixmap) glXDestroyPixmap(self->display, self->glx_pixmap);
if(glx_pixmap_bound) glXReleaseTexImageEXT(self->display, self->glx_pixmap, GLX_FRONT_EXT);
if(pixmap) XFreePixmap(self->display, self->pixmap);
if(configs) XFree(configs);
return result;
}
GLuint window_texture_get_opengl_texture_id(WindowTexture *self) {
return self->texture_id;
}
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