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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, EGLDisplay egl_display, Window window) {
window_texture->display = display;
window_texture->egl_display = egl_display;
window_texture->window = window;
window_texture->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->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;
Pixmap pixmap = None;
GLuint texture_id = 0;
EGLImage image = NULL;
const intptr_t pixmap_attrs[] = {
EGL_IMAGE_PRESERVED_KHR, EGL_TRUE,
EGL_NONE,
};
pixmap = XCompositeNameWindowPixmap(self->display, self->window);
if(!pixmap) {
result = 2;
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);
}
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);
*/
while(glGetError()) {}
while(eglGetError() != EGL_SUCCESS) {}
image = eglCreateImage(self->egl_display, NULL, EGL_NATIVE_PIXMAP_KHR, (EGLClientBuffer)pixmap, pixmap_attrs);
if(!image) {
/* One reason this can happen is if the egl display is not the same as the X11 display passed to window_texture_init */
result = 4;
goto cleanup;
}
glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image);
if(glGetError() != 0 || eglGetError() != EGL_SUCCESS) {
result = 5;
goto cleanup;
}
self->pixmap = pixmap;
self->texture_id = texture_id;
cleanup:
glBindTexture(GL_TEXTURE_2D, 0);
if(image)
eglDestroyImage(self->egl_display, image);
if(result != 0) {
if(texture_id != 0)
glDeleteTextures(1, &texture_id);
if(pixmap)
XFreePixmap(self->display, pixmap);
}
return result;
}
GLuint window_texture_get_opengl_texture_id(WindowTexture *self) {
return self->texture_id;
}
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