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picom/src/backend/gl/glx.c

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// 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 <GL/glx.h>
#include "backend/gl/glx.h"
#include "backend/backend.h"
#include "backend/gl/gl_common.h"
/// @brief Wrapper of a GLX FBConfig.
typedef struct {
GLXFBConfig cfg;
GLint texture_fmt;
GLint texture_tgts;
bool y_inverted;
} glx_fbconfig_t;
struct _glx_win_data {
gl_texture_t texture;
GLXPixmap glpixmap;
xcb_pixmap_t pixmap;
};
struct _glx_data {
int glx_event;
int glx_error;
GLXContext ctx;
gl_cap_t cap;
gl_blur_shader_t blur_shader[MAX_BLUR_PASS];
void (*glXBindTexImage)(Display *display, GLXDrawable drawable, int buffer,
const int *attrib_list);
void (*glXReleaseTexImage)(Display *display, GLXDrawable drawable, int buffer);
};
/**
* Check if a GLX extension exists.
*/
static inline bool glx_has_extension(session_t *ps, const char *ext) {
const char *glx_exts = glXQueryExtensionsString(ps->dpy, ps->scr);
if (!glx_exts) {
log_error("Failed get GLX extension list.");
return false;
}
int len = strlen(ext);
char *found = strstr(glx_exts, ext);
if (!found)
log_info("Missing GLX extension %s.", ext);
// Make sure extension names are not crazy...
assert(found[len] == ' ' || found[len] == 0);
return found != NULL;
}
/**
* @brief Release binding of a texture.
*/
void glx_release_pixmap(struct _glx_data *gd, Display *dpy, struct _glx_win_data *wd) {
// Release binding
if (wd->glpixmap && wd->texture.texture) {
glBindTexture(wd->texture.target, wd->texture.texture);
gd->glXReleaseTexImage(dpy, wd->glpixmap, GLX_FRONT_LEFT_EXT);
glBindTexture(wd->texture.target, 0);
}
// Free GLX Pixmap
if (wd->glpixmap) {
glXDestroyPixmap(dpy, wd->glpixmap);
wd->glpixmap = 0;
}
gl_check_err();
}
/**
* Free a glx_texture_t.
*/
static void glx_release_win(struct _glx_data *gd, Display *dpy, gl_texture_t *ptex) {
glx_release_pixmap(gd, dpy, ptex);
glDeleteTextures(1, &ptex->texture);
// Free structure itself
free(ptex);
}
/**
* Free GLX part of win.
*/
static inline void free_win_res_glx(session_t *ps, win *w) {
/*free_paint_glx(ps, &w->paint);*/
/*free_paint_glx(ps, &w->shadow_paint);*/
/*free_glx_bc(ps, &w->glx_blur_cache);*/
}
>>>>>>> 4bc5ef8... wip glx backend:src/backend/gl/glx.c
static inline int glx_cmp_fbconfig_cmpattr(session_t *ps, const glx_fbconfig_t *pfbc_a,
const glx_fbconfig_t *pfbc_b, int attr) {
int attr_a = 0, attr_b = 0;
// TODO: Error checking
glXGetFBConfigAttrib(ps->dpy, pfbc_a->cfg, attr, &attr_a);
glXGetFBConfigAttrib(ps->dpy, pfbc_b->cfg, attr, &attr_b);
return attr_a - attr_b;
}
/**
* Compare two GLX FBConfig's to find the preferred one.
*/
static int glx_cmp_fbconfig(session_t *ps, const glx_fbconfig_t *pfbc_a,
const glx_fbconfig_t *pfbc_b) {
int result = 0;
if (!pfbc_a)
return -1;
if (!pfbc_b)
return 1;
int tmpattr;
// Avoid 10-bit colors
glXGetFBConfigAttrib(ps->dpy, pfbc_a->cfg, GLX_RED_SIZE, &tmpattr);
if (tmpattr != 8)
return -1;
glXGetFBConfigAttrib(ps->dpy, pfbc_b->cfg, GLX_RED_SIZE, &tmpattr);
if (tmpattr != 8)
return 1;
#define P_CMPATTR_LT(attr) \
{ \
if ((result = glx_cmp_fbconfig_cmpattr(ps, pfbc_a, pfbc_b, (attr)))) \
return -result; \
}
#define P_CMPATTR_GT(attr) \
{ \
if ((result = glx_cmp_fbconfig_cmpattr(ps, pfbc_a, pfbc_b, (attr)))) \
return result; \
}
P_CMPATTR_LT(GLX_BIND_TO_TEXTURE_RGBA_EXT);
P_CMPATTR_LT(GLX_DOUBLEBUFFER);
P_CMPATTR_LT(GLX_STENCIL_SIZE);
P_CMPATTR_LT(GLX_DEPTH_SIZE);
P_CMPATTR_GT(GLX_BIND_TO_MIPMAP_TEXTURE_EXT);
return 0;
}
/**
* @brief Update the FBConfig of given depth.
*/
static inline void
glx_update_fbconfig_bydepth(session_t *ps, int depth, glx_fbconfig_t *pfbcfg) {
// Make sure the depth is sane
if (depth < 0 || depth > OPENGL_MAX_DEPTH)
return;
// Compare new FBConfig with current one
if (glx_cmp_fbconfig(ps, ps->psglx->fbconfigs[depth], pfbcfg) < 0) {
log_debug(
"(depth %d): %p overrides %p, target %#x.\n", depth, pfbcfg->cfg,
ps->psglx->fbconfigs[depth] ? ps->psglx->fbconfigs[depth]->cfg : 0,
pfbcfg->texture_tgts);
if (!ps->psglx->fbconfigs[depth]) {
ps->psglx->fbconfigs[depth] = cmalloc(glx_fbconfig_t);
}
(*ps->psglx->fbconfigs[depth]) = *pfbcfg;
}
}
/**
* Get GLX FBConfigs for all depths.
*/
static bool glx_update_fbconfig(session_t *ps) {
// Acquire all FBConfigs and loop through them
int nele = 0;
GLXFBConfig *pfbcfgs = glXGetFBConfigs(ps->dpy, ps->scr, &nele);
for (GLXFBConfig *pcur = pfbcfgs; pcur < pfbcfgs + nele; pcur++) {
glx_fbconfig_t fbinfo = {
.cfg = *pcur,
.texture_fmt = 0,
.texture_tgts = 0,
.y_inverted = false,
};
int id = (int)(pcur - pfbcfgs);
int depth = 0, depth_alpha = 0, val = 0;
// Skip over multi-sampled visuals
// http://people.freedesktop.org/~glisse/0001-glx-do-not-use-multisample-visual-config-for-front-o.patch
#ifdef GLX_SAMPLES
if (Success == glXGetFBConfigAttrib(ps->dpy, *pcur, GLX_SAMPLES, &val) &&
val > 1)
continue;
#endif
if (Success !=
glXGetFBConfigAttrib(ps->dpy, *pcur, GLX_BUFFER_SIZE, &depth) ||
Success != glXGetFBConfigAttrib(ps->dpy, *pcur, GLX_ALPHA_SIZE,
&depth_alpha)) {
log_error("Failed to retrieve buffer size and alpha size of "
"FBConfig %d.",
id);
continue;
}
if (Success != glXGetFBConfigAttrib(ps->dpy, *pcur,
GLX_BIND_TO_TEXTURE_TARGETS_EXT,
&fbinfo.texture_tgts)) {
log_error("Failed to retrieve BIND_TO_TEXTURE_TARGETS_EXT of "
"FBConfig %d.",
id);
continue;
}
int visualdepth = 0;
{
XVisualInfo *pvi = glXGetVisualFromFBConfig(ps->dpy, *pcur);
if (!pvi) {
// On nvidia-drivers-325.08 this happens slightly too often...
// log_error("Failed to retrieve X Visual of FBConfig %d.", id);
continue;
}
visualdepth = pvi->depth;
cxfree(pvi);
}
bool rgb = false;
bool rgba = false;
if (depth >= 32 && depth_alpha &&
Success == glXGetFBConfigAttrib(ps->dpy, *pcur,
GLX_BIND_TO_TEXTURE_RGBA_EXT, &val) &&
val)
rgba = true;
if (Success == glXGetFBConfigAttrib(ps->dpy, *pcur,
GLX_BIND_TO_TEXTURE_RGB_EXT, &val) &&
val)
rgb = true;
if (Success ==
glXGetFBConfigAttrib(ps->dpy, *pcur, GLX_Y_INVERTED_EXT, &val))
fbinfo.y_inverted = val;
{
int tgtdpt = depth - depth_alpha;
if (tgtdpt == visualdepth && tgtdpt < 32 && rgb) {
fbinfo.texture_fmt = GLX_TEXTURE_FORMAT_RGB_EXT;
glx_update_fbconfig_bydepth(ps, tgtdpt, &fbinfo);
}
}
if (depth == visualdepth && rgba) {
fbinfo.texture_fmt = GLX_TEXTURE_FORMAT_RGBA_EXT;
glx_update_fbconfig_bydepth(ps, depth, &fbinfo);
}
}
cxfree(pfbcfgs);
// Sanity checks
if (!ps->psglx->fbconfigs[ps->depth]) {
log_error("No FBConfig found for default depth %d.", ps->depth);
return false;
}
if (!ps->psglx->fbconfigs[32]) {
log_error("No FBConfig found for depth 32. Expect crazy things.");
}
log_trace("%d-bit: %p, 32-bit: %p", ps->depth,
ps->psglx->fbconfigs[ps->depth]->cfg, ps->psglx->fbconfigs[32]->cfg);
return true;
}
#ifdef DEBUG_GLX_DEBUG_CONTEXT
static inline GLXFBConfig
get_fbconfig_from_visualinfo(session_t *ps, const XVisualInfo *visualinfo) {
int nelements = 0;
GLXFBConfig *fbconfigs = glXGetFBConfigs(ps->dpy, visualinfo->screen, &nelements);
for (int i = 0; i < nelements; ++i) {
int visual_id = 0;
if (Success == glXGetFBConfigAttrib(ps->dpy, fbconfigs[i], GLX_VISUAL_ID,
&visual_id) &&
visual_id == visualinfo->visualid)
return fbconfigs[i];
}
return NULL;
}
static void
glx_debug_msg_callback(GLenum source, GLenum type, GLuint id, GLenum severity,
GLsizei length, const GLchar *message, GLvoid *userParam) {
log_trace("(): source 0x%04X, type 0x%04X, id %u, severity 0x%0X, \"%s\"", source,
type, id, severity, message);
}
#endif
/**
* Destroy GLX related resources.
*/
void glx_deinit(void *backend_data, session_t *ps) {
struct _glx_data *gd = backend_data;
// Free all GLX resources of windows
for (win *w = ps->list; w; w = w->next)
free_win_res_glx(ps, w);
// Free GLSL shaders/programs
for (int i = 0; i < MAX_BLUR_PASS; ++i) {
gl_free_blur_shader(&gd->blur_shader[i]);
}
glx_free_prog_main(ps, &ps->o.glx_prog_win);
gl_check_err();
// Free FBConfigs
for (int i = 0; i <= OPENGL_MAX_DEPTH; ++i) {
free(ps->psglx->fbconfigs[i]);
ps->psglx->fbconfigs[i] = NULL;
}
// Destroy GLX context
if (gd->ctx) {
glXDestroyContext(ps->dpy, gd->ctx);
gd->ctx = 0;
}
free(gd);
}
/**
* Initialize OpenGL.
*/
void *glx_init(session_t *ps) {
bool success = false;
auto gd = ccalloc(1, struct _glx_data);
XVisualInfo *pvis = NULL;
// Check for GLX extension
if (!glXQueryExtension(ps->dpy, &gd->glx_event, &gd->glx_error)) {
log_error("No GLX extension.");
goto end;
}
// Get XVisualInfo
int nitems = 0;
XVisualInfo vreq = {.visualid = ps->vis};
pvis = XGetVisualInfo(ps->dpy, VisualIDMask, &vreq, &nitems);
if (!pvis) {
log_error("Failed to acquire XVisualInfo for current visual.");
goto end;
}
// Ensure the visual is double-buffered
int value = 0;
if (glXGetConfig(ps->dpy, pvis, GLX_USE_GL, &value) || !value) {
log_error("Root visual is not a GL visual.");
goto end;
}
if (glXGetConfig(ps->dpy, pvis, GLX_DOUBLEBUFFER, &value) || !value) {
log_error("Root visual is not a double buffered GL visual.");
goto end;
}
// Ensure GLX_EXT_texture_from_pixmap exists
if (!glx_has_extension(ps, "GLX_EXT_texture_from_pixmap"))
goto end;
// Initialize GLX data structure
for (int i = 0; i < MAX_BLUR_PASS; ++i) {
gd->blur_shader[i] = (gl_blur_shader_t){.frag_shader = -1,
.prog = -1,
.unifm_offset_x = -1,
.unifm_offset_y = -1,
.unifm_factor_center = -1};
}
// Get GLX context
gd->ctx = glXCreateContext(ps->dpy, pvis, None, GL_TRUE);
if (!gd->ctx) {
log_error("Failed to get GLX context.");
goto end;
}
// Attach GLX context
GLXDrawable tgt = ps->overlay;
if (!tgt) {
tgt = ps->root;
}
if (!glXMakeCurrent(ps->dpy, tgt, gd->ctx)) {
log_error("Failed to attach GLX context.");
goto end;
}
#ifdef DEBUG_GLX_DEBUG_CONTEXT
f_DebugMessageCallback p_DebugMessageCallback =
(f_DebugMessageCallback)glXGetProcAddress((const GLubyte *)"glDebugMessageCal"
"lback");
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 (!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 end;
}
}
// Check GL_ARB_texture_non_power_of_two, requires a GLX context and
// must precede FBConfig fetching
gd->cap.non_power_of_two_texture = gl_has_extension(ps, "GL_ARB_texture_non_"
"power_of_two");
// Acquire function addresses
#if 0
psglx->glStringMarkerGREMEDY = (f_StringMarkerGREMEDY)
glXGetProcAddress((const GLubyte *) "glStringMarkerGREMEDY");
psglx->glFrameTerminatorGREMEDY = (f_FrameTerminatorGREMEDY)
glXGetProcAddress((const GLubyte *) "glFrameTerminatorGREMEDY");
#endif
gd->glXBindTexImage = (void *)glXGetProcAddress((const GLubyte *)"glXBindTexImage"
"EXT");
gd->glXReleaseTexImage = (void *)glXGetProcAddress((const GLubyte *)"glXReleaseTe"
"xImageEXT");
if (!gd->glXBindTexImage || !gd->glXReleaseTexImage) {
log_error("Failed to acquire glXBindTexImageEXT() and/or "
"glXReleaseTexImageEXT(), make sure your OpenGL supports"
"GLX_EXT_texture_from_pixmap");
goto end;
}
// Acquire FBConfigs
if (!glx_update_fbconfig(ps))
goto end;
// Render preparations
gl_resize(ps->root_width, ps->root_height);
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;
end:
cxfree(pvis);
if (!success) {
glx_deinit(gd, ps);
return NULL;
}
return gd;
}
/**
* Initialize GLX blur filter.
*/
bool glx_init_blur(session_t *ps) {
assert(ps->o.blur_kerns[0]);
// Allocate PBO if more than one blur kernel is present
if (ps->o.blur_kerns[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_ADD_GPUSHADER4 = " sum += "
"float(%.7g) * "
"%sOffset(tex_scr, "
"vec2(gl_TexCoord[0]"
".x, "
"gl_TexCoord[0].y), "
"ivec2(%d, %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 = strdup("");
if (use_texture_rect)
mstrextend(&extension, "#extension GL_ARB_texture_rectangle : "
"require\n");
if (ps->o.glx_use_gpushader4) {
mstrextend(&extension, "#extension GL_EXT_gpu_shader4 : "
"require\n");
shader_add = FRAG_SHADER_BLUR_ADD_GPUSHADER4;
}
for (int i = 0; i < MAX_BLUR_PASS && ps->o.blur_kerns[i]; ++i) {
xcb_render_fixed_t *kern = ps->o.blur_kerns[i];
if (!kern)
break;
glx_blur_pass_t *ppass = &ps->psglx->blur_passes[i];
// Build shader
{
int wid = XFIXED_TO_DOUBLE(kern[0]),
hei = XFIXED_TO_DOUBLE(kern[1]);
int nele = wid * hei - 1;
unsigned int len =
strlen(FRAG_SHADER_BLUR_PREFIX) +
strlen(sampler_type) + strlen(extension) +
(strlen(shader_add) + strlen(texture_func) + 42) *
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 < hei; ++j) {
for (int k = 0; k < wid; ++k) {
if (hei / 2 == j && wid / 2 == k)
continue;
double val = XFIXED_TO_DOUBLE(
kern[2 + j * wid + k]);
if (0.0 == val)
continue;
sum += val;
sprintf(pc, shader_add, val, texture_func,
k - wid / 2, j - hei / 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 =
glx_create_shader(GL_FRAGMENT_SHADER, shader_str);
free(shader_str);
}
if (!ppass->frag_shader) {
log_error("Failed to create fragment shader %d.", i);
return false;
}
// Build program
ppass->prog = glx_create_program(&ppass->frag_shader, 1);
if (!ppass->prog) {
log_error("Failed to create GLSL program.");
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 "'. " \
"Mig" \
"ht " \
"be " \
"tro" \
"ubl" \
"eso" \
"me" \
".", \
i); \
} \
}
P_GET_UNIFM_LOC("factor_center", unifm_factor_center);
if (!ps->o.glx_use_gpushader4) {
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);
}
glx_check_err(ps);
return true;
}
/**
* Bind a X pixmap to an OpenGL texture.
*/
bool glx_render_win(session_t *ps, glx_texture_t **pptex, xcb_pixmap_t pixmap,
unsigned width, unsigned height, unsigned depth) {
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;
}
glx_texture_t *ptex = *pptex;
bool need_release = true;
// Allocate structure
if (!ptex) {
static const glx_texture_t GLX_TEX_DEF = {
.texture = 0,
.glpixmap = 0,
.pixmap = 0,
.target = 0,
.width = 0,
.height = 0,
.depth = 0,
.y_inverted = false,
};
ptex = cmalloc(glx_texture_t);
memcpy(ptex, &GLX_TEX_DEF, sizeof(glx_texture_t));
*pptex = ptex;
}
// Release pixmap if parameters are inconsistent
if (ptex->texture && ptex->pixmap != pixmap) {
glx_release_pixmap(ps, ptex);
}
// Create GLX pixmap
if (!ptex->glpixmap) {
need_release = false;
// Retrieve pixmap parameters, if they aren't provided
if (!(width && height && depth)) {
Window rroot = None;
int rx = 0, ry = 0;
unsigned rbdwid = 0;
if (!XGetGeometry(ps->dpy, pixmap, &rroot, &rx, &ry, &width,
&height, &rbdwid, &depth)) {
log_error("Failed to query info of pixmap %#010x.", pixmap);
return false;
}
if (depth > OPENGL_MAX_DEPTH) {
log_error("Requested depth %d higher than max possible "
"depth %d.",
depth, OPENGL_MAX_DEPTH);
return false;
}
}
const glx_fbconfig_t *pcfg = ps->psglx->fbconfigs[depth];
if (!pcfg) {
log_error("Couldn't find FBConfig with requested depth %d", depth);
return false;
}
// Choose a suitable texture target for our pixmap.
// Refer to GLX_EXT_texture_om_pixmap spec to see what are the mean
// of the bits in texture_tgts
GLenum tex_tgt = 0;
if (GLX_TEXTURE_2D_BIT_EXT & pcfg->texture_tgts &&
ps->psglx->has_texture_non_power_of_two)
tex_tgt = GLX_TEXTURE_2D_EXT;
else if (GLX_TEXTURE_RECTANGLE_BIT_EXT & pcfg->texture_tgts)
tex_tgt = GLX_TEXTURE_RECTANGLE_EXT;
else if (!(GLX_TEXTURE_2D_BIT_EXT & pcfg->texture_tgts))
tex_tgt = GLX_TEXTURE_RECTANGLE_EXT;
else
tex_tgt = GLX_TEXTURE_2D_EXT;
log_debug("depth %d, tgt %#x, rgba %d\n", depth, tex_tgt,
(GLX_TEXTURE_FORMAT_RGBA_EXT == pcfg->texture_fmt));
GLint attrs[] = {
GLX_TEXTURE_FORMAT_EXT,
pcfg->texture_fmt,
GLX_TEXTURE_TARGET_EXT,
tex_tgt,
0,
};
ptex->glpixmap = glXCreatePixmap(ps->dpy, pcfg->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->depth = depth;
ptex->y_inverted = pcfg->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);
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)
ps->psglx->glXReleaseTexImageProc(ps->dpy, ptex->glpixmap,
GLX_FRONT_LEFT_EXT);
ps->psglx->glXBindTexImageProc(ps->dpy, ptex->glpixmap, GLX_FRONT_LEFT_EXT, NULL);
// Cleanup
glBindTexture(ptex->target, 0);
glDisable(ptex->target);
glx_check_err(ps);
return true;
}
#if 0
/**
* Preprocess function before start painting.
*/
void
glx_paint_pre(session_t *ps, region_t *preg) {
ps->psglx->z = 0.0;
// glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Get buffer age
bool trace_damage = (ps->o.glx_swap_method < 0 || ps->o.glx_swap_method > 1);
// Trace raw damage regions
region_t newdamage;
pixman_region32_init(&newdamage);
if (trace_damage)
copy_region(&newdamage, preg);
// We use GLX buffer_age extension to decide which pixels in
// the back buffer is reusable, and limit our redrawing
int buffer_age = 0;
// Query GLX_EXT_buffer_age for buffer age
if (ps->o.glx_swap_method == SWAPM_BUFFER_AGE) {
unsigned val = 0;
glXQueryDrawable(ps->dpy, get_tgt_window(ps),
GLX_BACK_BUFFER_AGE_EXT, &val);
buffer_age = val;
}
// Buffer age too high
if (buffer_age > CGLX_MAX_BUFFER_AGE + 1)
buffer_age = 0;
assert(buffer_age >= 0);
if (buffer_age) {
// Determine paint area
for (int i = 0; i < buffer_age - 1; ++i)
pixman_region32_union(preg, preg, &ps->all_damage_last[i]);
} else
// buffer_age == 0 means buffer age is not available, paint everything
copy_region(preg, &ps->screen_reg);
if (trace_damage) {
// XXX use a circular queue instead of memmove
pixman_region32_fini(&ps->all_damage_last[CGLX_MAX_BUFFER_AGE - 1]);
memmove(ps->all_damage_last + 1, ps->all_damage_last,
(CGLX_MAX_BUFFER_AGE - 1) * sizeof(region_t *));
ps->all_damage_last[0] = newdamage;
}
glx_set_clip(ps, preg);
#ifdef DEBUG_GLX_PAINTREG
glx_render_color(ps, 0, 0, ps->root_width, ps->root_height, 0, *preg, NULL);
#endif
glx_check_err(ps);
}
#endif
backend_info_t glx_backend = {
.init = glx_init,
};
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