reset

1 files changed, 0 insertions, 1514 deletions

diff --git a/src/opengl.c b/src/opengl.c
deleted file mode 100644
index 5d2d66c..0000000
--- a/src/opengl.c
+++ /dev/null
@@ -1,1514 +0,0 @@
-// SPDX-License-Identifier: MIT
-/*
- * Compton - a compositor for X11
- *
- * Based on `xcompmgr` - Copyright (c) 2003, Keith Packard
- *
- * Copyright (c) 2011-2013, Christopher Jeffrey
- * See LICENSE-mit for more information.
- *
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-#include <xcb/render.h>
-#include <xcb/xcb.h>
-
-#include "backend/gl/gl_common.h"
-#include "backend/gl/glx.h"
-#include "common.h"
-#include "compiler.h"
-#include "config.h"
-#include "kernel.h"
-#include "log.h"
-#include "region.h"
-#include "string_utils.h"
-#include "uthash_extra.h"
-#include "utils.h"
-#include "win.h"
-
-#include "opengl.h"
-
-#ifndef GL_TEXTURE_RECTANGLE
-#define GL_TEXTURE_RECTANGLE 0x84F5
-#endif
-
-static inline XVisualInfo *get_visualinfo_from_visual(session_t *ps, xcb_visualid_t visual) {
-	XVisualInfo vreq = {.visualid = visual};
-	int nitems = 0;
-
-	return XGetVisualInfo(ps->dpy, VisualIDMask, &vreq, &nitems);
-}
-
-/**
- * Initialize OpenGL.
- */
-bool glx_init(session_t *ps, bool need_render) {
-	bool success = false;
-	XVisualInfo *pvis = NULL;
-
-	// Check for GLX extension
-	if (!ps->glx_exists) {
-		log_error("No GLX extension.");
-		goto glx_init_end;
-	}
-
-	// Get XVisualInfo
-	pvis = get_visualinfo_from_visual(ps, ps->vis);
-	if (!pvis) {
-		log_error("Failed to acquire XVisualInfo for current visual.");
-		goto glx_init_end;
-	}
-
-	// Ensure the visual is double-buffered
-	if (need_render) {
-		int value = 0;
-		if (Success != glXGetConfig(ps->dpy, pvis, GLX_USE_GL, &value) || !value) {
-			log_error("Root visual is not a GL visual.");
-			goto glx_init_end;
-		}
-
-		if (Success != glXGetConfig(ps->dpy, pvis, GLX_DOUBLEBUFFER, &value) || !value) {
-			log_error("Root visual is not a double buffered GL visual.");
-			goto glx_init_end;
-		}
-	}
-
-	// Ensure GLX_EXT_texture_from_pixmap exists
-	if (need_render && !glxext.has_GLX_EXT_texture_from_pixmap)
-		goto glx_init_end;
-
-	// Initialize GLX data structure
-	if (!ps->psglx) {
-		static const glx_session_t CGLX_SESSION_DEF = CGLX_SESSION_INIT;
-		ps->psglx = cmalloc(glx_session_t);
-		memcpy(ps->psglx, &CGLX_SESSION_DEF, sizeof(glx_session_t));
-
-		// +1 for the zero terminator
-		ps->psglx->blur_passes = ccalloc(ps->o.blur_kernel_count, glx_blur_pass_t);
-
-		for (int i = 0; i < ps->o.blur_kernel_count; ++i) {
-			glx_blur_pass_t *ppass = &ps->psglx->blur_passes[i];
-			ppass->unifm_factor_center = -1;
-			ppass->unifm_offset_x = -1;
-			ppass->unifm_offset_y = -1;
-		}
-
-		ps->psglx->round_passes = ccalloc(1, glx_round_pass_t);
-		glx_round_pass_t *ppass = ps->psglx->round_passes;
-		ppass->unifm_radius = -1;
-		ppass->unifm_texcoord = -1;
-		ppass->unifm_texsize = -1;
-		ppass->unifm_borderw = -1;
-		ppass->unifm_borderc = -1;
-		ppass->unifm_resolution = -1;
-		ppass->unifm_tex_scr = -1;
-	}
-
-	glx_session_t *psglx = ps->psglx;
-
-	if (!psglx->context) {
-		// Get GLX context
-#ifndef DEBUG_GLX_DEBUG_CONTEXT
-		psglx->context = glXCreateContext(ps->dpy, pvis, None, GL_TRUE);
-#else
-		{
-			GLXFBConfig fbconfig = get_fbconfig_from_visualinfo(ps, pvis);
-			if (!fbconfig) {
-				log_error("Failed to get GLXFBConfig for root visual "
-				          "%#lx.",
-				          pvis->visualid);
-				goto glx_init_end;
-			}
-
-			f_glXCreateContextAttribsARB p_glXCreateContextAttribsARB =
-			    (f_glXCreateContextAttribsARB)glXGetProcAddress(
-			        (const GLubyte *)"glXCreateContextAttribsARB");
-			if (!p_glXCreateContextAttribsARB) {
-				log_error("Failed to get glXCreateContextAttribsARB().");
-				goto glx_init_end;
-			}
-
-			static const int attrib_list[] = {
-			    GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB, None};
-			psglx->context = p_glXCreateContextAttribsARB(
-			    ps->dpy, fbconfig, NULL, GL_TRUE, attrib_list);
-		}
-#endif
-
-		if (!psglx->context) {
-			log_error("Failed to get GLX context.");
-			goto glx_init_end;
-		}
-
-		// Attach GLX context
-		if (!glXMakeCurrent(ps->dpy, get_tgt_window(ps), psglx->context)) {
-			log_error("Failed to attach GLX context.");
-			goto glx_init_end;
-		}
-
-#ifdef DEBUG_GLX_DEBUG_CONTEXT
-		{
-			f_DebugMessageCallback p_DebugMessageCallback =
-			    (f_DebugMessageCallback)glXGetProcAddress(
-			        (const GLubyte *)"glDebugMessageCallback");
-			if (!p_DebugMessageCallback) {
-				log_error("Failed to get glDebugMessageCallback(0.");
-				goto glx_init_end;
-			}
-			p_DebugMessageCallback(glx_debug_msg_callback, ps);
-		}
-#endif
-	}
-
-	// Ensure we have a stencil buffer. X Fixes does not guarantee rectangles
-	// in regions don't overlap, so we must use stencil buffer to make sure
-	// we don't paint a region for more than one time, I think?
-	if (need_render && !ps->o.glx_no_stencil) {
-		GLint val = 0;
-		glGetIntegerv(GL_STENCIL_BITS, &val);
-		if (!val) {
-			log_error("Target window doesn't have stencil buffer.");
-			goto glx_init_end;
-		}
-	}
-
-	// Check GL_ARB_texture_non_power_of_two, requires a GLX context and
-	// must precede FBConfig fetching
-	if (need_render)
-		psglx->has_texture_non_power_of_two =
-		    gl_has_extension("GL_ARB_texture_non_power_of_two");
-
-	// Render preparations
-	if (need_render) {
-		glx_on_root_change(ps);
-
-		glDisable(GL_DEPTH_TEST);
-		glDepthMask(GL_FALSE);
-		glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
-		glDisable(GL_BLEND);
-
-		if (!ps->o.glx_no_stencil) {
-			// Initialize stencil buffer
-			glClear(GL_STENCIL_BUFFER_BIT);
-			glDisable(GL_STENCIL_TEST);
-			glStencilMask(0x1);
-			glStencilFunc(GL_EQUAL, 0x1, 0x1);
-		}
-
-		// Clear screen
-		glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
-		// glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-		// glXSwapBuffers(ps->dpy, get_tgt_window(ps));
-	}
-
-	success = true;
-
-glx_init_end:
-	XFree(pvis);
-
-	if (!success)
-		glx_destroy(ps);
-
-	return success;
-}
-
-static void glx_free_prog_main(glx_prog_main_t *pprogram) {
-	if (!pprogram)
-		return;
-	if (pprogram->prog) {
-		glDeleteProgram(pprogram->prog);
-		pprogram->prog = 0;
-	}
-	pprogram->unifm_opacity = -1;
-	pprogram->unifm_invert_color = -1;
-	pprogram->unifm_tex = -1;
-}
-
-/**
- * Destroy GLX related resources.
- */
-void glx_destroy(session_t *ps) {
-	if (!ps->psglx)
-		return;
-
-	// Free all GLX resources of windows
-	win_stack_foreach_managed(w, &ps->window_stack) {
-		free_win_res_glx(ps, w);
-	}
-
-	// Free GLSL shaders/programs
-	for (int i = 0; i < ps->o.blur_kernel_count; ++i) {
-		glx_blur_pass_t *ppass = &ps->psglx->blur_passes[i];
-		if (ppass->frag_shader) {
-			glDeleteShader(ppass->frag_shader);
-		}
-		if (ppass->prog) {
-			glDeleteProgram(ppass->prog);
-		}
-	}
-	free(ps->psglx->blur_passes);
-
-	glx_round_pass_t *ppass = ps->psglx->round_passes;
-	if (ppass->frag_shader) {
-		glDeleteShader(ppass->frag_shader);
-	}
-	if (ppass->prog) {
-		glDeleteProgram(ppass->prog);
-	}
-	free(ps->psglx->round_passes);
-
-	glx_free_prog_main(&ps->glx_prog_win);
-
-	gl_check_err();
-
-	// Destroy GLX context
-	if (ps->psglx->context) {
-		glXMakeCurrent(ps->dpy, None, NULL);
-		glXDestroyContext(ps->dpy, ps->psglx->context);
-		ps->psglx->context = NULL;
-	}
-
-	free(ps->psglx);
-	ps->psglx = NULL;
-	ps->argb_fbconfig = NULL;
-}
-
-/**
- * Callback to run on root window size change.
- */
-void glx_on_root_change(session_t *ps) {
-	glViewport(0, 0, ps->root_width, ps->root_height);
-
-	// Initialize matrix, copied from dcompmgr
-	glMatrixMode(GL_PROJECTION);
-	glLoadIdentity();
-	glOrtho(0, ps->root_width, 0, ps->root_height, -1000.0, 1000.0);
-	glMatrixMode(GL_MODELVIEW);
-	glLoadIdentity();
-}
-
-/**
- * Initialize GLX blur filter.
- */
-bool glx_init_blur(session_t *ps) {
-	assert(ps->o.blur_kernel_count > 0);
-	assert(ps->o.blur_kerns);
-	assert(ps->o.blur_kerns[0]);
-
-	// Allocate PBO if more than one blur kernel is present
-	if (ps->o.blur_kernel_count > 1) {
-		// Try to generate a framebuffer
-		GLuint fbo = 0;
-		glGenFramebuffers(1, &fbo);
-		if (!fbo) {
-			log_error("Failed to generate Framebuffer. Cannot do multi-pass "
-			          "blur with GLX"
-			          " backend.");
-			return false;
-		}
-		glDeleteFramebuffers(1, &fbo);
-	}
-
-	{
-		char *lc_numeric_old = strdup(setlocale(LC_NUMERIC, NULL));
-		// Enforce LC_NUMERIC locale "C" here to make sure decimal point is sane
-		// Thanks to hiciu for reporting.
-		setlocale(LC_NUMERIC, "C");
-
-		static const char *FRAG_SHADER_BLUR_PREFIX =
-		    "#version 110\n"
-		    "%s"
-		    "uniform float offset_x;\n"
-		    "uniform float offset_y;\n"
-		    "uniform float factor_center;\n"
-		    "uniform %s tex_scr;\n"
-		    "\n"
-		    "void main() {\n"
-		    "  vec4 sum = vec4(0.0, 0.0, 0.0, 0.0);\n";
-		static const char *FRAG_SHADER_BLUR_ADD =
-		    "  sum += float(%.7g) * %s(tex_scr, vec2(gl_TexCoord[0].x + offset_x "
-		    "* float(%d), gl_TexCoord[0].y + offset_y * float(%d)));\n";
-		static const char *FRAG_SHADER_BLUR_SUFFIX =
-		    "  sum += %s(tex_scr, vec2(gl_TexCoord[0].x, gl_TexCoord[0].y)) * "
-		    "factor_center;\n"
-		    "  gl_FragColor = sum / (factor_center + float(%.7g));\n"
-		    "}\n";
-
-		const bool use_texture_rect = !ps->psglx->has_texture_non_power_of_two;
-		const char *sampler_type = (use_texture_rect ? "sampler2DRect" : "sampler2D");
-		const char *texture_func = (use_texture_rect ? "texture2DRect" : "texture2D");
-		const char *shader_add = FRAG_SHADER_BLUR_ADD;
-		char *extension = NULL;
-		if (use_texture_rect) {
-			mstrextend(&extension, "#extension GL_ARB_texture_rectangle : "
-			                       "require\n");
-		}
-		if (!extension) {
-			extension = strdup("");
-		}
-
-		for (int i = 0; i < ps->o.blur_kernel_count; ++i) {
-			auto kern = ps->o.blur_kerns[i];
-			glx_blur_pass_t *ppass = &ps->psglx->blur_passes[i];
-
-			// Build shader
-			int width = kern->w, height = kern->h;
-			int nele = width * height - 1;
-			assert(nele >= 0);
-			auto len =
-			    strlen(FRAG_SHADER_BLUR_PREFIX) + strlen(sampler_type) +
-			    strlen(extension) +
-			    (strlen(shader_add) + strlen(texture_func) + 42) * (uint)nele +
-			    strlen(FRAG_SHADER_BLUR_SUFFIX) + strlen(texture_func) + 12 + 1;
-			char *shader_str = ccalloc(len, char);
-			char *pc = shader_str;
-			sprintf(pc, FRAG_SHADER_BLUR_PREFIX, extension, sampler_type);
-			pc += strlen(pc);
-			assert(strlen(shader_str) < len);
-
-			double sum = 0.0;
-			for (int j = 0; j < height; ++j) {
-				for (int k = 0; k < width; ++k) {
-					if (height / 2 == j && width / 2 == k)
-						continue;
-					double val = kern->data[j * width + k];
-					if (val == 0) {
-						continue;
-					}
-					sum += val;
-					sprintf(pc, shader_add, val, texture_func,
-					        k - width / 2, j - height / 2);
-					pc += strlen(pc);
-					assert(strlen(shader_str) < len);
-				}
-			}
-
-			sprintf(pc, FRAG_SHADER_BLUR_SUFFIX, texture_func, sum);
-			assert(strlen(shader_str) < len);
-			ppass->frag_shader = gl_create_shader(GL_FRAGMENT_SHADER, shader_str);
-			free(shader_str);
-
-			if (!ppass->frag_shader) {
-				log_error("Failed to create fragment shader %d.", i);
-				free(extension);
-				free(lc_numeric_old);
-				return false;
-			}
-
-			// Build program
-			ppass->prog = gl_create_program(&ppass->frag_shader, 1);
-			if (!ppass->prog) {
-				log_error("Failed to create GLSL program.");
-				free(extension);
-				free(lc_numeric_old);
-				return false;
-			}
-
-			// Get uniform addresses
-#define P_GET_UNIFM_LOC(name, target)                                                    \
-	{                                                                                \
-		ppass->target = glGetUniformLocation(ppass->prog, name);                 \
-		if (ppass->target < 0) {                                                 \
-			log_error("Failed to get location of %d-th uniform '" name       \
-			          "'. Might be troublesome.",                            \
-			          i);                                                    \
-		}                                                                        \
-	}
-
-			P_GET_UNIFM_LOC("factor_center", unifm_factor_center);
-			P_GET_UNIFM_LOC("offset_x", unifm_offset_x);
-			P_GET_UNIFM_LOC("offset_y", unifm_offset_y);
-
-#undef P_GET_UNIFM_LOC
-		}
-		free(extension);
-
-		// Restore LC_NUMERIC
-		setlocale(LC_NUMERIC, lc_numeric_old);
-		free(lc_numeric_old);
-	}
-
-	gl_check_err();
-
-	return true;
-}
-
-/**
- * Initialize GLX rounded corners filter.
- */
-bool glx_init_rounded_corners(session_t *ps) {
-	char *lc_numeric_old = strdup(setlocale(LC_NUMERIC, NULL));
-	// Enforce LC_NUMERIC locale "C" here to make sure decimal point is sane
-	// Thanks to hiciu for reporting.
-	setlocale(LC_NUMERIC, "C");
-
-	static const char *FRAG_SHADER =
-	    "#version 110\n"
-	    "%s"        // extensions
-	    "uniform float u_radius;\n"
-	    "uniform float u_borderw;\n"
-	    "uniform vec4 u_borderc;\n"
-	    "uniform vec2 u_texcoord;\n"
-	    "uniform vec2 u_texsize;\n"
-	    "uniform vec2 u_resolution;\n"
-	    "uniform %s tex_scr;\n"        // sampler2D | sampler2DRect
-	    "\n"
-	    "// https://www.shadertoy.com/view/ltS3zW\n"
-	    "float RectSDF(vec2 p, vec2 b, float r) {\n"
-	    "  vec2 d = abs(p) - b + vec2(r);\n"
-	    "  return min(max(d.x, d.y), 0.0) + length(max(d, 0.0)) - r;\n"
-	    "}\n\n"
-	    "void main()\n"
-	    "{\n"
-	    "  vec2 coord = vec2(u_texcoord.x, "
-	    "u_resolution.y-u_texsize.y-u_texcoord.y);\n"
-	    "  vec4 u_v4WndBgColor = %s(tex_scr, vec2(gl_TexCoord[0].st));\n"
-	    "  float u_fRadiusPx = u_radius;\n"
-	    "  float u_fHalfBorderThickness = u_borderw / 2.0;\n"
-	    "  vec4 u_v4BorderColor = u_borderc;\n"
-	    "  vec4 u_v4FillColor = vec4(0.0, 0.0, 0.0, 0.0);\n"
-	    "  vec4 v4FromColor = u_v4BorderColor;	//Always the border "
-	    "color. If no border, this still should be set\n"
-	    "  vec4 v4ToColor = u_v4WndBgColor;		//Outside color is the "
-	    "background texture\n"
-	    "\n"
-	    "  vec2 u_v2HalfShapeSizePx = u_texsize/2.0 - "
-	    "vec2(u_fHalfBorderThickness);\n"
-	    "  vec2 v_v2CenteredPos = (gl_FragCoord.xy - u_texsize.xy / 2.0 - "
-	    "coord);\n"
-	    "\n"
-	    "  float fDist = RectSDF(v_v2CenteredPos, u_v2HalfShapeSizePx, "
-	    "u_fRadiusPx - u_fHalfBorderThickness);\n"
-	    "  if (u_fHalfBorderThickness > 0.0) {\n"
-	    "    if (fDist < 0.0) {\n"
-	    "      v4ToColor = u_v4FillColor;\n"
-	    "    }\n"
-	    "    fDist = abs(fDist) - u_fHalfBorderThickness;\n"
-	    "  } else {\n"
-	    "    v4FromColor = u_v4FillColor;\n"
-	    "  }\n"
-	    "  float fBlendAmount = smoothstep(-1.0, 1.0, fDist);\n"
-	    "  vec4 c = mix(v4FromColor, v4ToColor, fBlendAmount);\n"
-	    "\n"
-	    "  // final color\n"
-	    "  gl_FragColor = c;\n"
-	    "\n"
-	    "}\n";
-
-	const bool use_texture_rect = !ps->psglx->has_texture_non_power_of_two;
-	const char *sampler_type = (use_texture_rect ? "sampler2DRect" : "sampler2D");
-	const char *texture_func = (use_texture_rect ? "texture2DRect" : "texture2D");
-	char *extension = NULL;
-	if (use_texture_rect) {
-		mstrextend(&extension, "#extension GL_ARB_texture_rectangle : "
-		                       "require\n");
-	}
-	if (!extension) {
-		extension = strdup("");
-	}
-
-	bool success = false;
-	// Build rounded corners shader
-	auto ppass = ps->psglx->round_passes;
-	auto len = strlen(FRAG_SHADER) + strlen(extension) + strlen(sampler_type) +
-	           strlen(texture_func) + 1;
-	char *shader_str = ccalloc(len, char);
-
-	sprintf(shader_str, FRAG_SHADER, extension, sampler_type, texture_func);
-	assert(strlen(shader_str) < len);
-
-	log_debug("Generated rounded corners shader:\n%s\n", shader_str);
-
-	ppass->frag_shader = gl_create_shader(GL_FRAGMENT_SHADER, shader_str);
-	free(shader_str);
-
-	if (!ppass->frag_shader) {
-		log_error("Failed to create rounded corners fragment shader.");
-		goto out;
-	}
-
-	// Build program
-	ppass->prog = gl_create_program(&ppass->frag_shader, 1);
-	if (!ppass->prog) {
-		log_error("Failed to create GLSL program.");
-		goto out;
-	}
-
-	// Get uniform addresses
-#define P_GET_UNIFM_LOC(name, target)                                                    \
-	{                                                                                \
-		ppass->target = glGetUniformLocation(ppass->prog, name);                 \
-		if (ppass->target < 0) {                                                 \
-			log_debug("Failed to get location of rounded corners uniform "   \
-			          "'" name "'. Might be troublesome.");                  \
-		}                                                                        \
-	}
-	P_GET_UNIFM_LOC("u_radius", unifm_radius);
-	P_GET_UNIFM_LOC("u_texcoord", unifm_texcoord);
-	P_GET_UNIFM_LOC("u_texsize", unifm_texsize);
-	P_GET_UNIFM_LOC("u_borderw", unifm_borderw);
-	P_GET_UNIFM_LOC("u_borderc", unifm_borderc);
-	P_GET_UNIFM_LOC("u_resolution", unifm_resolution);
-	P_GET_UNIFM_LOC("tex_scr", unifm_tex_scr);
-#undef P_GET_UNIFM_LOC
-
-	success = true;
-
-out:
-	free(extension);
-
-	// Restore LC_NUMERIC
-	setlocale(LC_NUMERIC, lc_numeric_old);
-	free(lc_numeric_old);
-
-	gl_check_err();
-
-	return success;
-}
-
-/**
- * Load a GLSL main program from shader strings.
- */
-bool glx_load_prog_main(const char *vshader_str, const char *fshader_str,
-                        glx_prog_main_t *pprogram) {
-	assert(pprogram);
-
-	// Build program
-	pprogram->prog = gl_create_program_from_str(vshader_str, fshader_str);
-	if (!pprogram->prog) {
-		log_error("Failed to create GLSL program.");
-		return false;
-	}
-
-	// Get uniform addresses
-#define P_GET_UNIFM_LOC(name, target)                                                    \
-	{                                                                                \
-		pprogram->target = glGetUniformLocation(pprogram->prog, name);           \
-		if (pprogram->target < 0) {                                              \
-			log_error("Failed to get location of uniform '" name             \
-			          "'. Might be troublesome.");                           \
-		}                                                                        \
-	}
-	P_GET_UNIFM_LOC("opacity", unifm_opacity);
-	P_GET_UNIFM_LOC("invert_color", unifm_invert_color);
-	P_GET_UNIFM_LOC("tex", unifm_tex);
-	P_GET_UNIFM_LOC("time", unifm_time);
-#undef P_GET_UNIFM_LOC
-
-	gl_check_err();
-
-	return true;
-}
-
-static inline void glx_copy_region_to_tex(session_t *ps, GLenum tex_tgt, int basex,
-                                          int basey, int dx, int dy, int width, int height) {
-	if (width > 0 && height > 0) {
-		glCopyTexSubImage2D(tex_tgt, 0, dx - basex, dy - basey, dx,
-		                    ps->root_height - dy - height, width, height);
-	}
-}
-
-static inline GLuint glx_gen_texture(GLenum tex_tgt, int width, int height) {
-	GLuint tex = 0;
-	glGenTextures(1, &tex);
-	if (!tex) {
-		return 0;
-	}
-	glEnable(tex_tgt);
-	glBindTexture(tex_tgt, tex);
-	glTexParameteri(tex_tgt, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-	glTexParameteri(tex_tgt, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-	glTexParameteri(tex_tgt, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-	glTexParameteri(tex_tgt, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-	glTexImage2D(tex_tgt, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
-	glBindTexture(tex_tgt, 0);
-
-	return tex;
-}
-
-/**
- * Bind an OpenGL texture and fill it with pixel data from back buffer
- */
-bool glx_bind_texture(session_t *ps attr_unused, glx_texture_t **pptex, int x, int y,
-                      int width, int height) {
-	if (ps->o.backend != BKEND_GLX && ps->o.backend != BKEND_XR_GLX_HYBRID) {
-		return true;
-	}
-
-	glx_texture_t *ptex = *pptex;
-
-	// log_trace("Copying xy(%d %d) wh(%d %d) ptex(%p)", x, y, width, height, ptex);
-
-	// Release texture if parameters are inconsistent
-	if (ptex && ptex->texture && (ptex->width != width || ptex->height != height)) {
-		free_texture(ps, &ptex);
-	}
-
-	// Allocate structure
-	if (!ptex) {
-		ptex = ccalloc(1, glx_texture_t);
-		*pptex = ptex;
-
-		ptex->width = width;
-		ptex->height = height;
-		ptex->target = GL_TEXTURE_RECTANGLE;
-		if (ps->psglx->has_texture_non_power_of_two) {
-			ptex->target = GL_TEXTURE_2D;
-		}
-	}
-
-	// Create texture
-	if (!ptex->texture) {
-		ptex->texture = glx_gen_texture(ptex->target, width, height);
-	}
-	if (!ptex->texture) {
-		log_error("Failed to allocate texture.");
-		return false;
-	}
-
-	// Read destination pixels into a texture
-	glEnable(ptex->target);
-	glBindTexture(ptex->target, ptex->texture);
-	if (width > 0 && height > 0) {
-		glx_copy_region_to_tex(ps, ptex->target, x, y, x, y, width, height);
-	}
-
-	// Cleanup
-	glBindTexture(ptex->target, 0);
-	glDisable(ptex->target);
-
-	gl_check_err();
-
-	return true;
-}
-
-/**
- * Bind a X pixmap to an OpenGL texture.
- */
-bool glx_bind_pixmap(session_t *ps, glx_texture_t **pptex, xcb_pixmap_t pixmap, int width,
-                     int height, bool repeat, const struct glx_fbconfig_info *fbcfg) {
-	if (ps->o.backend != BKEND_GLX && ps->o.backend != BKEND_XR_GLX_HYBRID)
-		return true;
-
-	if (!pixmap) {
-		log_error("Binding to an empty pixmap %#010x. This can't work.", pixmap);
-		return false;
-	}
-
-	assert(fbcfg);
-	glx_texture_t *ptex = *pptex;
-	bool need_release = true;
-
-	// Release pixmap if parameters are inconsistent
-	if (ptex && ptex->texture && ptex->pixmap != pixmap) {
-		glx_release_pixmap(ps, ptex);
-	}
-
-	// Allocate structure
-	if (!ptex) {
-		static const glx_texture_t GLX_TEX_DEF = {
-		    .texture = 0,
-		    .glpixmap = 0,
-		    .pixmap = 0,
-		    .target = 0,
-		    .width = 0,
-		    .height = 0,
-		    .y_inverted = false,
-		};
-
-		ptex = cmalloc(glx_texture_t);
-		memcpy(ptex, &GLX_TEX_DEF, sizeof(glx_texture_t));
-		*pptex = ptex;
-	}
-
-	// Create GLX pixmap
-	int depth = 0;
-	if (!ptex->glpixmap) {
-		need_release = false;
-
-		// Retrieve pixmap parameters, if they aren't provided
-		if (!width || !height) {
-			auto r = xcb_get_geometry_reply(
-			    ps->c, xcb_get_geometry(ps->c, pixmap), NULL);
-			if (!r) {
-				log_error("Failed to query info of pixmap %#010x.", pixmap);
-				return false;
-			}
-			if (r->depth > OPENGL_MAX_DEPTH) {
-				log_error("Requested depth %d higher than %d.", depth,
-				          OPENGL_MAX_DEPTH);
-				return false;
-			}
-			depth = r->depth;
-			width = r->width;
-			height = r->height;
-			free(r);
-		}
-
-		// Determine texture target, copied from compiz
-		// The assumption we made here is the target never changes based on any
-		// pixmap-specific parameters, and this may change in the future
-		GLenum tex_tgt = 0;
-		if (GLX_TEXTURE_2D_BIT_EXT & fbcfg->texture_tgts &&
-		    ps->psglx->has_texture_non_power_of_two)
-			tex_tgt = GLX_TEXTURE_2D_EXT;
-		else if (GLX_TEXTURE_RECTANGLE_BIT_EXT & fbcfg->texture_tgts)
-			tex_tgt = GLX_TEXTURE_RECTANGLE_EXT;
-		else if (!(GLX_TEXTURE_2D_BIT_EXT & fbcfg->texture_tgts))
-			tex_tgt = GLX_TEXTURE_RECTANGLE_EXT;
-		else
-			tex_tgt = GLX_TEXTURE_2D_EXT;
-
-		log_debug("depth %d, tgt %#x, rgba %d", depth, tex_tgt,
-		          (GLX_TEXTURE_FORMAT_RGBA_EXT == fbcfg->texture_fmt));
-
-		GLint attrs[] = {
-		    GLX_TEXTURE_FORMAT_EXT,
-		    fbcfg->texture_fmt,
-		    GLX_TEXTURE_TARGET_EXT,
-		    (GLint)tex_tgt,
-		    0,
-		};
-
-		ptex->glpixmap = glXCreatePixmap(ps->dpy, fbcfg->cfg, pixmap, attrs);
-		ptex->pixmap = pixmap;
-		ptex->target =
-		    (GLX_TEXTURE_2D_EXT == tex_tgt ? GL_TEXTURE_2D : GL_TEXTURE_RECTANGLE);
-		ptex->width = width;
-		ptex->height = height;
-		ptex->y_inverted = fbcfg->y_inverted;
-	}
-	if (!ptex->glpixmap) {
-		log_error("Failed to allocate GLX pixmap.");
-		return false;
-	}
-
-	glEnable(ptex->target);
-
-	// Create texture
-	if (!ptex->texture) {
-		need_release = false;
-
-		GLuint texture = 0;
-		glGenTextures(1, &texture);
-		glBindTexture(ptex->target, texture);
-
-		glTexParameteri(ptex->target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-		glTexParameteri(ptex->target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-		if (repeat) {
-			glTexParameteri(ptex->target, GL_TEXTURE_WRAP_S, GL_REPEAT);
-			glTexParameteri(ptex->target, GL_TEXTURE_WRAP_T, GL_REPEAT);
-		} else {
-			glTexParameteri(ptex->target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-			glTexParameteri(ptex->target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-		}
-
-		glBindTexture(ptex->target, 0);
-
-		ptex->texture = texture;
-	}
-	if (!ptex->texture) {
-		log_error("Failed to allocate texture.");
-		return false;
-	}
-
-	glBindTexture(ptex->target, ptex->texture);
-
-	// The specification requires rebinding whenever the content changes...
-	// We can't follow this, too slow.
-	if (need_release)
-		glXReleaseTexImageEXT(ps->dpy, ptex->glpixmap, GLX_FRONT_LEFT_EXT);
-
-	glXBindTexImageEXT(ps->dpy, ptex->glpixmap, GLX_FRONT_LEFT_EXT, NULL);
-
-	// Cleanup
-	glBindTexture(ptex->target, 0);
-	glDisable(ptex->target);
-
-	gl_check_err();
-
-	return true;
-}
-
-/**
- * @brief Release binding of a texture.
- */
-void glx_release_pixmap(session_t *ps, glx_texture_t *ptex) {
-	// Release binding
-	if (ptex->glpixmap && ptex->texture) {
-		glBindTexture(ptex->target, ptex->texture);
-		glXReleaseTexImageEXT(ps->dpy, ptex->glpixmap, GLX_FRONT_LEFT_EXT);
-		glBindTexture(ptex->target, 0);
-	}
-
-	// Free GLX Pixmap
-	if (ptex->glpixmap) {
-		glXDestroyPixmap(ps->dpy, ptex->glpixmap);
-		ptex->glpixmap = 0;
-	}
-
-	gl_check_err();
-}
-
-/**
- * Set clipping region on the target window.
- */
-void glx_set_clip(session_t *ps, const region_t *reg) {
-	// Quit if we aren't using stencils
-	if (ps->o.glx_no_stencil)
-		return;
-
-	glDisable(GL_STENCIL_TEST);
-	glDisable(GL_SCISSOR_TEST);
-
-	if (!reg)
-		return;
-
-	int nrects;
-	const rect_t *rects = pixman_region32_rectangles((region_t *)reg, &nrects);
-
-	if (nrects == 1) {
-		glEnable(GL_SCISSOR_TEST);
-		glScissor(rects[0].x1, ps->root_height - rects[0].y2,
-		          rects[0].x2 - rects[0].x1, rects[0].y2 - rects[0].y1);
-	}
-
-	gl_check_err();
-}
-
-#define P_PAINTREG_START(var)                                                            \
-	region_t reg_new;                                                                \
-	int nrects;                                                                      \
-	const rect_t *rects;                                                             \
-	assert(width >= 0 && height >= 0);                                               \
-	pixman_region32_init_rect(&reg_new, dx, dy, (uint)width, (uint)height);          \
-	pixman_region32_intersect(&reg_new, &reg_new, (region_t *)reg_tgt);              \
-	rects = pixman_region32_rectangles(&reg_new, &nrects);                           \
-	glBegin(GL_QUADS);                                                               \
-                                                                                         \
-	for (int ri = 0; ri < nrects; ++ri) {                                            \
-		rect_t var = rects[ri];
-
-#define P_PAINTREG_END()                                                                 \
-	}                                                                                \
-	glEnd();                                                                         \
-                                                                                         \
-	pixman_region32_fini(&reg_new);
-
-/**
- * Blur contents in a particular region.
- *
- * XXX seems to be way to complex for what it does
- */
-bool glx_blur_dst(session_t *ps, int dx, int dy, int width, int height, float z,
-                  GLfloat factor_center, const region_t *reg_tgt, glx_blur_cache_t *pbc) {
-	assert(ps->psglx->blur_passes[0].prog);
-	const bool more_passes = ps->o.blur_kernel_count > 1;
-	const bool have_scissors = glIsEnabled(GL_SCISSOR_TEST);
-	const bool have_stencil = glIsEnabled(GL_STENCIL_TEST);
-	bool ret = false;
-
-	// Calculate copy region size
-	glx_blur_cache_t ibc = {.width = 0, .height = 0};
-	if (!pbc)
-		pbc = &ibc;
-
-	int mdx = dx, mdy = dy, mwidth = width, mheight = height;
-	// log_trace("%d, %d, %d, %d", mdx, mdy, mwidth, mheight);
-
-	/*
-	if (ps->o.resize_damage > 0) {
-	  int inc_x = 0, inc_y = 0;
-	  for (int i = 0; i < MAX_BLUR_PASS; ++i) {
-	    XFixed *kern = ps->o.blur_kerns[i];
-	    if (!kern) break;
-	    inc_x += XFIXED_TO_DOUBLE(kern[0]) / 2;
-	    inc_y += XFIXED_TO_DOUBLE(kern[1]) / 2;
-	  }
-	  inc_x = min2(ps->o.resize_damage, inc_x);
-	  inc_y = min2(ps->o.resize_damage, inc_y);
-
-	  mdx = max2(dx - inc_x, 0);
-	  mdy = max2(dy - inc_y, 0);
-	  int mdx2 = min2(dx + width + inc_x, ps->root_width),
-	      mdy2 = min2(dy + height + inc_y, ps->root_height);
-	  mwidth = mdx2 - mdx;
-	  mheight = mdy2 - mdy;
-	}
-	*/
-
-	GLenum tex_tgt = GL_TEXTURE_RECTANGLE;
-	if (ps->psglx->has_texture_non_power_of_two)
-		tex_tgt = GL_TEXTURE_2D;
-
-	// Free textures if size inconsistency discovered
-	if (mwidth != pbc->width || mheight != pbc->height)
-		free_glx_bc_resize(ps, pbc);
-
-	// Generate FBO and textures if needed
-	if (!pbc->textures[0])
-		pbc->textures[0] = glx_gen_texture(tex_tgt, mwidth, mheight);
-	GLuint tex_scr = pbc->textures[0];
-	if (more_passes && !pbc->textures[1])
-		pbc->textures[1] = glx_gen_texture(tex_tgt, mwidth, mheight);
-	pbc->width = mwidth;
-	pbc->height = mheight;
-	GLuint tex_scr2 = pbc->textures[1];
-	if (more_passes && !pbc->fbo)
-		glGenFramebuffers(1, &pbc->fbo);
-	const GLuint fbo = pbc->fbo;
-
-	if (!tex_scr || (more_passes && !tex_scr2)) {
-		log_error("Failed to allocate texture.");
-		goto glx_blur_dst_end;
-	}
-	if (more_passes && !fbo) {
-		log_error("Failed to allocate framebuffer.");
-		goto glx_blur_dst_end;
-	}
-
-	// Read destination pixels into a texture
-	glEnable(tex_tgt);
-	glBindTexture(tex_tgt, tex_scr);
-	glx_copy_region_to_tex(ps, tex_tgt, mdx, mdy, mdx, mdy, mwidth, mheight);
-	/*
-	if (tex_scr2) {
-	  glBindTexture(tex_tgt, tex_scr2);
-	  glx_copy_region_to_tex(ps, tex_tgt, mdx, mdy, mdx, mdy, mwidth, dx - mdx);
-	  glx_copy_region_to_tex(ps, tex_tgt, mdx, mdy, mdx, dy + height,
-	      mwidth, mdy + mheight - dy - height);
-	  glx_copy_region_to_tex(ps, tex_tgt, mdx, mdy, mdx, dy, dx - mdx, height);
-	  glx_copy_region_to_tex(ps, tex_tgt, mdx, mdy, dx + width, dy,
-	      mdx + mwidth - dx - width, height);
-	} */
-
-	// Texture scaling factor
-	GLfloat texfac_x = 1.0f, texfac_y = 1.0f;
-	if (tex_tgt == GL_TEXTURE_2D) {
-		texfac_x /= (GLfloat)mwidth;
-		texfac_y /= (GLfloat)mheight;
-	}
-
-	// Paint it back
-	if (more_passes) {
-		glDisable(GL_STENCIL_TEST);
-		glDisable(GL_SCISSOR_TEST);
-	}
-
-	bool last_pass = false;
-	for (int i = 0; i < ps->o.blur_kernel_count; ++i) {
-		last_pass = (i == ps->o.blur_kernel_count - 1);
-		const glx_blur_pass_t *ppass = &ps->psglx->blur_passes[i];
-		assert(ppass->prog);
-
-		assert(tex_scr);
-		glBindTexture(tex_tgt, tex_scr);
-
-		if (!last_pass) {
-			glBindFramebuffer(GL_FRAMEBUFFER, fbo);
-			glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
-			                       GL_TEXTURE_2D, tex_scr2, 0);
-			glDrawBuffer(GL_COLOR_ATTACHMENT0);
-			if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
-				log_error("Framebuffer attachment failed.");
-				goto glx_blur_dst_end;
-			}
-		} else {
-			glBindFramebuffer(GL_FRAMEBUFFER, 0);
-			glDrawBuffer(GL_BACK);
-			if (have_scissors)
-				glEnable(GL_SCISSOR_TEST);
-			if (have_stencil)
-				glEnable(GL_STENCIL_TEST);
-		}
-
-		// Color negation for testing...
-		// glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
-		// glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_REPLACE);
-		// glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_ONE_MINUS_SRC_COLOR);
-
-		glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
-		glUseProgram(ppass->prog);
-		if (ppass->unifm_offset_x >= 0)
-			glUniform1f(ppass->unifm_offset_x, texfac_x);
-		if (ppass->unifm_offset_y >= 0)
-			glUniform1f(ppass->unifm_offset_y, texfac_y);
-		if (ppass->unifm_factor_center >= 0)
-			glUniform1f(ppass->unifm_factor_center, factor_center);
-
-		P_PAINTREG_START(crect) {
-			auto rx = (GLfloat)(crect.x1 - mdx) * texfac_x;
-			auto ry = (GLfloat)(mheight - (crect.y1 - mdy)) * texfac_y;
-			auto rxe = rx + (GLfloat)(crect.x2 - crect.x1) * texfac_x;
-			auto rye = ry - (GLfloat)(crect.y2 - crect.y1) * texfac_y;
-			auto rdx = (GLfloat)(crect.x1 - mdx);
-			auto rdy = (GLfloat)(mheight - crect.y1 + mdy);
-			if (last_pass) {
-				rdx = (GLfloat)crect.x1;
-				rdy = (GLfloat)(ps->root_height - crect.y1);
-			}
-			auto rdxe = rdx + (GLfloat)(crect.x2 - crect.x1);
-			auto rdye = rdy - (GLfloat)(crect.y2 - crect.y1);
-
-			// log_trace("%f, %f, %f, %f -> %f, %f, %f, %f", rx, ry,
-			// rxe, rye, rdx,
-			//          rdy, rdxe, rdye);
-
-			glTexCoord2f(rx, ry);
-			glVertex3f(rdx, rdy, z);
-
-			glTexCoord2f(rxe, ry);
-			glVertex3f(rdxe, rdy, z);
-
-			glTexCoord2f(rxe, rye);
-			glVertex3f(rdxe, rdye, z);
-
-			glTexCoord2f(rx, rye);
-			glVertex3f(rdx, rdye, z);
-		}
-		P_PAINTREG_END();
-
-		glUseProgram(0);
-
-		// Swap tex_scr and tex_scr2
-		{
-			GLuint tmp = tex_scr2;
-			tex_scr2 = tex_scr;
-			tex_scr = tmp;
-		}
-	}
-
-	ret = true;
-
-glx_blur_dst_end:
-	glBindFramebuffer(GL_FRAMEBUFFER, 0);
-	glBindTexture(tex_tgt, 0);
-	glDisable(tex_tgt);
-	if (have_scissors)
-		glEnable(GL_SCISSOR_TEST);
-	if (have_stencil)
-		glEnable(GL_STENCIL_TEST);
-
-	if (&ibc == pbc) {
-		free_glx_bc(ps, pbc);
-	}
-
-	gl_check_err();
-
-	return ret;
-}
-
-// TODO(bhagwan) this is a mess and needs a more consistent way of getting the border
-// pixel I tried looking for a notify event for XCB_CW_BORDER_PIXEL (in
-// xcb_create_window()) or a way to get the pixels from xcb_render_picture_t but the
-// documentation for the xcb_xrender extension is literaly non existent...
-//
-// NOTE(yshui) There is no consistent way to get the "border" color of a X window. From
-// the WM's perspective there are multiple ways to implement window borders. Using
-// glReadPixel is probably the most reliable way.
-void glx_read_border_pixel(int root_height, int root_width, int x, int y, int width,
-                           int height, float *ppixel) {
-	assert(ppixel);
-
-	// Reset the color so the shader doesn't use it
-	ppixel[0] = ppixel[1] = ppixel[2] = ppixel[3] = -1.0F;
-
-	// First try bottom left corner past the
-	// circle radius (after the rounded corner ends)
-	auto screen_x = x;
-	auto screen_y = root_height - height - y;
-
-	// X is out of bounds
-	// move to the right side
-	if (screen_x < 0) {
-		screen_x += width;
-	}
-
-	// Y is out of bounds
-	// move to to top part
-	if (screen_y < 0) {
-		screen_y += height;
-	}
-
-	// All corners are out of bounds, give up
-	if (screen_x < 0 || screen_y < 0 || screen_x >= root_width || screen_y >= root_height) {
-		return;
-	}
-
-	// Invert Y-axis so we can query border color from texture (0,0)
-	glReadPixels(screen_x, screen_y, 1, 1, GL_RGBA, GL_FLOAT, (void *)ppixel);
-
-	log_trace("xy(%d, %d), glxy(%d %d) wh(%d %d), border_col(%.2f, %.2f, %.2f, %.2f)",
-	          x, y, screen_x, screen_y, width, height, (float)ppixel[0],
-	          (float)ppixel[1], (float)ppixel[2], (float)ppixel[3]);
-
-	gl_check_err();
-}
-
-bool glx_round_corners_dst(session_t *ps, struct managed_win *w,
-                           const glx_texture_t *ptex, int dx, int dy, int width,
-                           int height, float z, float cr, const region_t *reg_tgt) {
-	assert(ps->psglx->round_passes->prog);
-	bool ret = false;
-
-	// log_warn("dxy(%d, %d) wh(%d %d) rwh(%d %d) b(%d), f(%d)",
-	//	dx, dy, width, height, ps->root_width, ps->root_height, w->g.border_width,
-	// w->focused);
-
-	int mdx = dx, mdy = dy, mwidth = width, mheight = height;
-	log_trace("%d, %d, %d, %d", mdx, mdy, mwidth, mheight);
-
-	if (w->g.border_width > 0) {
-		glx_read_border_pixel(ps->root_height, ps->root_width, dx, dy, width,
-		                      height, &w->border_col[0]);
-	}
-
-	{
-		const glx_round_pass_t *ppass = ps->psglx->round_passes;
-		assert(ppass->prog);
-
-		glEnable(GL_BLEND);
-		glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
-
-		glUseProgram(ppass->prog);
-
-		// If caller specified a texture use it as source
-		log_trace("ptex: %p wh(%d %d) %d %d", ptex, ptex->width, ptex->height,
-		          ptex->target, ptex->texture);
-
-		glActiveTexture(GL_TEXTURE0);
-		glBindTexture(ptex->target, ptex->texture);
-
-		if (ppass->unifm_tex_scr >= 0) {
-			glUniform1i(ppass->unifm_tex_scr, (GLint)0);
-		}
-		if (ppass->unifm_radius >= 0) {
-			glUniform1f(ppass->unifm_radius, cr);
-		}
-		if (ppass->unifm_texcoord >= 0) {
-			glUniform2f(ppass->unifm_texcoord, (float)dx, (float)dy);
-		}
-		if (ppass->unifm_texsize >= 0) {
-			glUniform2f(ppass->unifm_texsize, (float)mwidth, (float)mheight);
-		}
-		if (ppass->unifm_borderw >= 0) {
-			// Don't render rounded border if we don't know the border color
-			glUniform1f(ppass->unifm_borderw,
-			            w->border_col[0] != -1. ? (GLfloat)w->g.border_width : 0);
-		}
-		if (ppass->unifm_borderc >= 0) {
-			glUniform4f(ppass->unifm_borderc, w->border_col[0],
-			            w->border_col[1], w->border_col[2], w->border_col[3]);
-		}
-		if (ppass->unifm_resolution >= 0) {
-			glUniform2f(ppass->unifm_resolution, (float)ps->root_width,
-			            (float)ps->root_height);
-		}
-
-		// Painting
-		{
-			P_PAINTREG_START(crect) {
-				// texture-local coordinates
-				auto rx = (GLfloat)(crect.x1 - dx);
-				auto ry = (GLfloat)(crect.y1 - dy);
-				auto rxe = rx + (GLfloat)(crect.x2 - crect.x1);
-				auto rye = ry + (GLfloat)(crect.y2 - crect.y1);
-				if (GL_TEXTURE_2D == ptex->target) {
-					rx = rx / (GLfloat)width;
-					ry = ry / (GLfloat)height;
-					rxe = rxe / (GLfloat)width;
-					rye = rye / (GLfloat)height;
-				}
-
-				// coordinates for the texture in the target
-				auto rdx = (GLfloat)crect.x1;
-				auto rdy = (GLfloat)(ps->root_height - crect.y1);
-				auto rdxe = (GLfloat)rdx + (GLfloat)(crect.x2 - crect.x1);
-				auto rdye = (GLfloat)rdy - (GLfloat)(crect.y2 - crect.y1);
-
-				// Invert Y if needed, this may not work as expected,
-				// though. I don't have such a FBConfig to test with.
-				ry = 1.0F - ry;
-				rye = 1.0F - rye;
-
-				// log_trace("Rect %d (i:%d): %f, %f, %f, %f -> %f, %f,
-				// %f, %f", 	ri ,ptex ? ptex->y_inverted : -1, rx, ry,
-				// rxe,
-				// rye, rdx, rdy, rdxe, rdye);
-
-				glTexCoord2f(rx, ry);
-				glVertex3f(rdx, rdy, z);
-
-				glTexCoord2f(rxe, ry);
-				glVertex3f(rdxe, rdy, z);
-
-				glTexCoord2f(rxe, rye);
-				glVertex3f(rdxe, rdye, z);
-
-				glTexCoord2f(rx, rye);
-				glVertex3f(rdx, rdye, z);
-			}
-			P_PAINTREG_END();
-		}
-
-		glUseProgram(0);
-		glDisable(GL_BLEND);
-	}
-
-	ret = true;
-
-	glBindTexture(ptex->target, 0);
-	glDisable(ptex->target);
-	glDisable(GL_BLEND);
-
-	gl_check_err();
-
-	return ret;
-}
-
-bool glx_dim_dst(session_t *ps, int dx, int dy, int width, int height, int z,
-                 GLfloat factor, const region_t *reg_tgt) {
-	// It's possible to dim in glx_render(), but it would be over-complicated
-	// considering all those mess in color negation and modulation
-	glEnable(GL_BLEND);
-	glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
-	glColor4f(0.0f, 0.0f, 0.0f, factor);
-
-	P_PAINTREG_START(crect) {
-		// XXX what does all of these variables mean?
-		GLint rdx = crect.x1;
-		GLint rdy = ps->root_height - crect.y1;
-		GLint rdxe = rdx + (crect.x2 - crect.x1);
-		GLint rdye = rdy - (crect.y2 - crect.y1);
-
-		glVertex3i(rdx, rdy, z);
-		glVertex3i(rdxe, rdy, z);
-		glVertex3i(rdxe, rdye, z);
-		glVertex3i(rdx, rdye, z);
-	}
-	P_PAINTREG_END();
-
-	glColor4f(0.0f, 0.0f, 0.0f, 0.0f);
-	glDisable(GL_BLEND);
-
-	gl_check_err();
-
-	return true;
-}
-
-/**
- * @brief Render a region with texture data.
- */
-bool glx_render(session_t *ps, const glx_texture_t *ptex, int x, int y, int dx, int dy,
-                int width, int height, int z, double opacity, bool argb, bool neg,
-                const region_t *reg_tgt, const glx_prog_main_t *pprogram) {
-	if (!ptex || !ptex->texture) {
-		log_error("Missing texture.");
-		return false;
-	}
-
-	const bool has_prog = pprogram && pprogram->prog;
-	bool dual_texture = false;
-
-	// It's required by legacy versions of OpenGL to enable texture target
-	// before specifying environment. Thanks to madsy for telling me.
-	glEnable(ptex->target);
-
-	// Enable blending if needed
-	if (opacity < 1.0 || argb) {
-
-		glEnable(GL_BLEND);
-
-		// Needed for handling opacity of ARGB texture
-		glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
-
-		// This is all weird, but X Render is using premultiplied ARGB format, and
-		// we need to use those things to correct it. Thanks to derhass for help.
-		glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
-		glColor4d(opacity, opacity, opacity, opacity);
-	}
-
-	if (!has_prog) {
-		// The default, fixed-function path
-		// Color negation
-		if (neg) {
-			// Simple color negation
-			if (!glIsEnabled(GL_BLEND)) {
-				glEnable(GL_COLOR_LOGIC_OP);
-				glLogicOp(GL_COPY_INVERTED);
-			}
-			// ARGB texture color negation
-			else if (argb) {
-				dual_texture = true;
-
-				// Use two texture stages because the calculation is too
-				// complicated, thanks to madsy for providing code Texture
-				// stage 0
-				glActiveTexture(GL_TEXTURE0);
-
-				// Negation for premultiplied color: color = A - C
-				glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_SUBTRACT);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_TEXTURE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_ALPHA);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB, GL_TEXTURE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
-
-				// Pass texture alpha through
-				glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_REPLACE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA, GL_TEXTURE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
-
-				// Texture stage 1
-				glActiveTexture(GL_TEXTURE1);
-				glEnable(ptex->target);
-				glBindTexture(ptex->target, ptex->texture);
-
-				glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
-
-				// Modulation with constant factor
-				glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_PREVIOUS);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB, GL_PRIMARY_COLOR);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_ALPHA);
-
-				// Modulation with constant factor
-				glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_MODULATE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA, GL_PREVIOUS);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA, GL_PRIMARY_COLOR);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
-
-				glActiveTexture(GL_TEXTURE0);
-			}
-			// RGB blend color negation
-			else {
-				glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
-
-				// Modulation with constant factor
-				glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, GL_MODULATE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_RGB, GL_TEXTURE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB,
-				          GL_ONE_MINUS_SRC_COLOR);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_RGB, GL_PRIMARY_COLOR);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
-
-				// Modulation with constant factor
-				glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, GL_MODULATE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE0_ALPHA, GL_TEXTURE);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
-				glTexEnvi(GL_TEXTURE_ENV, GL_SOURCE1_ALPHA, GL_PRIMARY_COLOR);
-				glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
-			}
-		}
-	} else {
-		// Programmable path
-		assert(pprogram->prog);
-		glUseProgram(pprogram->prog);
-		struct timespec ts;
-		clock_gettime(CLOCK_MONOTONIC, &ts);
-		if (pprogram->unifm_opacity >= 0)
-			glUniform1f(pprogram->unifm_opacity, (float)opacity);
-		if (pprogram->unifm_invert_color >= 0)
-			glUniform1i(pprogram->unifm_invert_color, neg);
-		if (pprogram->unifm_tex >= 0)
-			glUniform1i(pprogram->unifm_tex, 0);
-		if (pprogram->unifm_time >= 0)
-			glUniform1f(pprogram->unifm_time, (float)ts.tv_sec * 1000.0f +
-			                                      (float)ts.tv_nsec / 1.0e6f);
-	}
-
-	// log_trace("Draw: %d, %d, %d, %d -> %d, %d (%d, %d) z %d", x, y, width, height,
-	//          dx, dy, ptex->width, ptex->height, z);
-
-	// Bind texture
-	glBindTexture(ptex->target, ptex->texture);
-	if (dual_texture) {
-		glActiveTexture(GL_TEXTURE1);
-		glBindTexture(ptex->target, ptex->texture);
-		glActiveTexture(GL_TEXTURE0);
-	}
-
-	// Painting
-	{
-		P_PAINTREG_START(crect) {
-			// texture-local coordinates
-			auto rx = (GLfloat)(crect.x1 - dx + x);
-			auto ry = (GLfloat)(crect.y1 - dy + y);
-			auto rxe = rx + (GLfloat)(crect.x2 - crect.x1);
-			auto rye = ry + (GLfloat)(crect.y2 - crect.y1);
-			// Rectangle textures have [0-w] [0-h] while 2D texture has [0-1]
-			// [0-1] Thanks to amonakov for pointing out!
-			if (GL_TEXTURE_2D == ptex->target) {
-				rx = rx / (GLfloat)ptex->width;
-				ry = ry / (GLfloat)ptex->height;
-				rxe = rxe / (GLfloat)ptex->width;
-				rye = rye / (GLfloat)ptex->height;
-			}
-
-			// coordinates for the texture in the target
-			GLint rdx = crect.x1;
-			GLint rdy = ps->root_height - crect.y1;
-			GLint rdxe = rdx + (crect.x2 - crect.x1);
-			GLint rdye = rdy - (crect.y2 - crect.y1);
-
-			// Invert Y if needed, this may not work as expected, though. I
-			// don't have such a FBConfig to test with.
-			if (!ptex->y_inverted) {
-				ry = 1.0f - ry;
-				rye = 1.0f - rye;
-			}
-
-			// log_trace("Rect %d: %f, %f, %f, %f -> %d, %d, %d, %d", ri, rx,
-			// ry, rxe, rye,
-			//          rdx, rdy, rdxe, rdye);
-
-#define P_TEXCOORD(cx, cy)                                                               \
-	{                                                                                \
-		if (dual_texture) {                                                      \
-			glMultiTexCoord2f(GL_TEXTURE0, cx, cy);                          \
-			glMultiTexCoord2f(GL_TEXTURE1, cx, cy);                          \
-		} else                                                                   \
-			glTexCoord2f(cx, cy);                                            \
-	}
-			P_TEXCOORD(rx, ry);
-			glVertex3i(rdx, rdy, z);
-
-			P_TEXCOORD(rxe, ry);
-			glVertex3i(rdxe, rdy, z);
-
-			P_TEXCOORD(rxe, rye);
-			glVertex3i(rdxe, rdye, z);
-
-			P_TEXCOORD(rx, rye);
-			glVertex3i(rdx, rdye, z);
-		}
-		P_PAINTREG_END();
-	}
-
-	// Cleanup
-	glBindTexture(ptex->target, 0);
-	glColor4f(0.0f, 0.0f, 0.0f, 0.0f);
-	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
-	glDisable(GL_BLEND);
-	glDisable(GL_COLOR_LOGIC_OP);
-	glDisable(ptex->target);
-
-	if (dual_texture) {
-		glActiveTexture(GL_TEXTURE1);
-		glBindTexture(ptex->target, 0);
-		glDisable(ptex->target);
-		glActiveTexture(GL_TEXTURE0);
-	}
-
-	if (has_prog)
-		glUseProgram(0);
-
-	gl_check_err();
-
-	return true;
-}