wip

src/window_texture.c

@@ -0,0 +1,185 @@
+#include "../include/window_texture.h"
+#include <X11/extensions/Xcomposite.h>
+#include <mgl/mgl.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) {
+    mgl_context *context = mgl_get_context();
+
+    if(delete_texture && self->texture_id) {
+        context->gl.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) {
+    mgl_context *context = mgl_get_context();
+    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_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
+    };
+
+    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) {
+        context->gl.glGenTextures(1, &texture_id);
+        if(texture_id == 0) {
+            result = 4;
+            goto cleanup;
+        }
+        context->gl.glBindTexture(GL_TEXTURE_2D, texture_id);
+    } else {
+        context->gl.glBindTexture(GL_TEXTURE_2D, self->texture_id);
+    }
+
+    glXBindTexImageEXT(self->display, glx_pixmap, GLX_FRONT_EXT, NULL);
+    glx_pixmap_bound = 1;
+
+    context->gl.glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
+    context->gl.glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
+    context->gl.glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
+    context->gl.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);
+    */
+
+    context->gl.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)     context->gl.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(pixmap)              XFreePixmap(self->display, pixmap);
+    if(configs)             XFree(configs);
+    return result;
+}
+
+GLuint window_texture_get_opengl_texture_id(WindowTexture *self) {
+    return self->texture_id;
+}