diff options
Diffstat (limited to 'src/window_texture.c')
-rw-r--r-- | src/window_texture.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/src/window_texture.c b/src/window_texture.c new file mode 100644 index 0000000..0f4aa2c --- /dev/null +++ b/src/window_texture.c @@ -0,0 +1,123 @@ +#include "../include/window_texture.h" +#include <X11/extensions/Xcomposite.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, gsr_egl *egl) { + window_texture->display = display; + window_texture->window = window; + window_texture->pixmap = None; + window_texture->texture_id = 0; + window_texture->redirected = 0; + window_texture->egl = egl; + + 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) { + self->egl->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; + unsigned int 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) { + self->egl->glGenTextures(1, &texture_id); + if(texture_id == 0) { + result = 3; + goto cleanup; + } + self->egl->glBindTexture(GL_TEXTURE_2D, texture_id); + } else { + self->egl->glBindTexture(GL_TEXTURE_2D, self->texture_id); + texture_id = self->texture_id; + } + + self->egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + self->egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + self->egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + self->egl->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + + while(self->egl->glGetError()) {} + while(self->egl->eglGetError() != EGL_SUCCESS) {} + + image = self->egl->eglCreateImage(self->egl->egl_display, NULL, EGL_NATIVE_PIXMAP_KHR, (EGLClientBuffer)pixmap, pixmap_attrs); + if(!image) { + result = 4; + goto cleanup; + } + + self->egl->glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, image); + if(self->egl->glGetError() != 0 || self->egl->eglGetError() != EGL_SUCCESS) { + result = 5; + goto cleanup; + } + + self->pixmap = pixmap; + self->texture_id = texture_id; + + cleanup: + self->egl->glBindTexture(GL_TEXTURE_2D, 0); + + if(image) + self->egl->eglDestroyImage(self->egl->egl_display, image); + + if(result != 0) { + if(texture_id != 0) + self->egl->glDeleteTextures(1, &texture_id); + if(pixmap) + XFreePixmap(self->display, pixmap); + } + + return result; +} + +unsigned int window_texture_get_opengl_texture_id(WindowTexture *self) { + return self->texture_id; +} |