From 705ad3bee5de67725311d4085f0481fa7107ba41 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Thu, 11 Jan 2024 23:47:35 +0100
Subject: Render wallpaper

---
 src/pixmap_texture.c | 140 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 src/pixmap_texture.c

(limited to 'src/pixmap_texture.c')

diff --git a/src/pixmap_texture.c b/src/pixmap_texture.c
new file mode 100644
index 0000000..b31b346
--- /dev/null
+++ b/src/pixmap_texture.c
@@ -0,0 +1,140 @@
+#include "pixmap_texture.h"
+
+#include <stdio.h>
+
+bool ngxc_pixmap_texture_init(ngxc_pixmap_texture *window_texture, Display *display, Pixmap pixmap) {
+    window_texture->display = display;
+    window_texture->pixmap = pixmap;
+    window_texture->glx_pixmap = None;
+    window_texture->texture_id = 0;
+    window_texture->width = 0;
+    window_texture->height = 0;
+    return ngxc_pixmap_texture_on_resize(window_texture);
+}
+
+static void ngxc_pixmap_texture_cleanup(ngxc_pixmap_texture *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;
+    }
+}
+
+void ngxc_pixmap_texture_deinit(ngxc_pixmap_texture *self) {
+    ngxc_pixmap_texture_cleanup(self, 1);
+}
+
+bool ngxc_pixmap_texture_on_resize(ngxc_pixmap_texture *self) {
+    ngxc_pixmap_texture_cleanup(self, 0);
+
+    GLXFBConfig *configs = NULL;
+    GLXPixmap glx_pixmap = None;
+    GLuint texture_id = 0;
+    int glx_pixmap_bound = 0;
+
+    const int pixmap_config[] = {
+        GLX_BIND_TO_TEXTURE_RGB_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_BUFFER_SIZE, 24,
+        GLX_RED_SIZE, 8,
+        GLX_GREEN_SIZE, 8,
+        GLX_BLUE_SIZE, 8,
+        GLX_ALPHA_SIZE, 0,
+        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
+    };
+
+    Window root_window;
+    int x, y;
+    unsigned int width = 0;
+    unsigned int height = 0;
+    unsigned int border_width;
+    unsigned int depth = 32;
+    if(!XGetGeometry(self->display, self->pixmap, &root_window, &x, &y, &width, &height, &border_width, &depth)) {
+        fprintf(stderr, "Failed to get pixmap attributes\n");
+        return false;
+    }
+
+    GLXFBConfig config;
+    int c;
+    configs = glXChooseFBConfig(self->display, 0, pixmap_config, &c);
+    if(!configs) {
+        fprintf(stderr, "Failed to choose fb config\n");
+        return false;
+    }
+
+    int found = 0;
+    for (int i = 0; i < c; i++) {
+        config = configs[i];
+        XVisualInfo *visual = glXGetVisualFromFBConfig(self->display, config);
+        if(!visual)
+            continue;
+
+        if((int)depth != visual->depth) {
+            XFree(visual);
+            continue;
+        }
+        XFree(visual);
+        found = 1;
+        break;
+    }
+
+    if(!found) {
+        fprintf(stderr, "No matching fb config found\n");
+        goto cleanup;
+    }
+
+    glx_pixmap = glXCreatePixmap(self->display, config, self->pixmap, pixmap_attribs);
+    if(!glx_pixmap) {
+        goto cleanup;
+    }
+
+    if(self->texture_id == 0) {
+        glGenTextures(1, &texture_id);
+        if(texture_id == 0) {
+            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_NEAREST );
+    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
+
+    glBindTexture(GL_TEXTURE_2D, 0);
+
+    self->width = width;
+    self->height = height;
+
+    XFree(configs);
+    self->glx_pixmap = glx_pixmap;
+    if(texture_id != 0)
+        self->texture_id = texture_id;
+    return true;
+
+    cleanup:
+    if(texture_id != 0)     glDeleteTextures(1, &texture_id);
+    if(glx_pixmap)          glXDestroyPixmap(self->display, glx_pixmap);
+    if(glx_pixmap_bound)    glXReleaseTexImageEXT(self->display, glx_pixmap, GLX_FRONT_EXT);
+    if(configs)             XFree(configs);
+    return false;
+}
-- 
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