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picom/src/opengl.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 "opengl.h"
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) {
#ifdef DEBUG_GLX
printf_dbgf("(%d): %#x overrides %#x, target %#x.\n", depth, (unsigned) pfbcfg->cfg, (ps->psglx->fbconfigs[depth] ? (unsigned) ps->psglx->fbconfigs[depth]->cfg: 0), pfbcfg->texture_tgts);
#endif
if (!ps->psglx->fbconfigs[depth]) {
ps->psglx->fbconfigs[depth] = malloc(sizeof(glx_fbconfig_t));
allocchk(ps->psglx->fbconfigs[depth]);
}
(*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)) {
printf_errf("(): 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)) {
printf_errf("(): 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...
// printf_errf("(): 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]) {
printf_errf("(): No FBConfig found for default depth %d.", ps->depth);
return false;
}
if (!ps->psglx->fbconfigs[32]) {
printf_errf("(): No FBConfig found for depth 32. Expect crazy things.");
}
#ifdef DEBUG_GLX
printf_dbgf("(): %d-bit: %#3x, 32-bit: %#3x\n",
ps->depth, (int) ps->psglx->fbconfigs[ps->depth]->cfg,
(int) ps->psglx->fbconfigs[32]->cfg);
#endif
return true;
}
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);
}
#ifdef CONFIG_GLX_SYNC
void
xr_glx_sync(session_t *ps, Drawable d, XSyncFence *pfence) {
if (*pfence) {
// GLsync sync = ps->psglx->glFenceSyncProc(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
GLsync sync = ps->psglx->glImportSyncEXT(GL_SYNC_X11_FENCE_EXT, *pfence, 0);
/* GLenum ret = ps->psglx->glClientWaitSyncProc(sync, GL_SYNC_FLUSH_COMMANDS_BIT,
1000);
assert(GL_CONDITION_SATISFIED == ret); */
XSyncTriggerFence(ps->dpy, *pfence);
XFlush(ps->dpy);
ps->psglx->glWaitSyncProc(sync, 0, GL_TIMEOUT_IGNORED);
// ps->psglx->glDeleteSyncProc(sync);
// XSyncResetFence(ps->dpy, *pfence);
}
glx_check_err(ps);
}
#endif
#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) {
printf_dbgf("(): source 0x%04X, type 0x%04X, id %u, severity 0x%0X, \"%s\"\n",
source, type, id, severity, message);
}
#endif
/**
* 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) {
if (glXQueryExtension(ps->dpy, &ps->glx_event, &ps->glx_error))
ps->glx_exists = true;
else {
printf_errf("(): No GLX extension.");
goto glx_init_end;
}
}
// Get XVisualInfo
pvis = get_visualinfo_from_visual(ps, ps->vis);
if (!pvis) {
printf_errf("(): 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) {
printf_errf("(): Root visual is not a GL visual.");
goto glx_init_end;
}
if (Success != glXGetConfig(ps->dpy, pvis, GLX_DOUBLEBUFFER, &value)
|| !value) {
printf_errf("(): Root visual is not a double buffered GL visual.");
goto glx_init_end;
}
}
// Ensure GLX_EXT_texture_from_pixmap exists
if (need_render && !glx_hasglxext(ps, "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(1, glx_session_t);
memcpy(ps->psglx, &CGLX_SESSION_DEF, sizeof(glx_session_t));
for (int i = 0; i < MAX_BLUR_PASS; ++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;
}
}
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) {
printf_errf("(): 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) {
printf_errf("(): 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) {
printf_errf("(): Failed to get GLX context.");
goto glx_init_end;
}
// Attach GLX context
if (!glXMakeCurrent(ps->dpy, get_tgt_window(ps), psglx->context)) {
printf_errf("(): 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) {
printf_errf("(): 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) {
printf_errf("(): 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 = glx_hasglext(ps,
"GL_ARB_texture_non_power_of_two");
// Acquire function addresses
if (need_render) {
#ifdef DEBUG_GLX_MARK
psglx->glStringMarkerGREMEDY = (f_StringMarkerGREMEDY)
glXGetProcAddress((const GLubyte *) "glStringMarkerGREMEDY");
psglx->glFrameTerminatorGREMEDY = (f_FrameTerminatorGREMEDY)
glXGetProcAddress((const GLubyte *) "glFrameTerminatorGREMEDY");
#endif
psglx->glXBindTexImageProc = (f_BindTexImageEXT)
glXGetProcAddress((const GLubyte *) "glXBindTexImageEXT");
psglx->glXReleaseTexImageProc = (f_ReleaseTexImageEXT)
glXGetProcAddress((const GLubyte *) "glXReleaseTexImageEXT");
if (!psglx->glXBindTexImageProc || !psglx->glXReleaseTexImageProc) {
printf_errf("(): Failed to acquire glXBindTexImageEXT() / glXReleaseTexImageEXT().");
goto glx_init_end;
}
#ifdef CONFIG_GLX_SYNC
psglx->glFenceSyncProc = (f_FenceSync)
glXGetProcAddress((const GLubyte *) "glFenceSync");
psglx->glIsSyncProc = (f_IsSync)
glXGetProcAddress((const GLubyte *) "glIsSync");
psglx->glDeleteSyncProc = (f_DeleteSync)
glXGetProcAddress((const GLubyte *) "glDeleteSync");
psglx->glClientWaitSyncProc = (f_ClientWaitSync)
glXGetProcAddress((const GLubyte *) "glClientWaitSync");
psglx->glWaitSyncProc = (f_WaitSync)
glXGetProcAddress((const GLubyte *) "glWaitSync");
psglx->glImportSyncEXT = (f_ImportSyncEXT)
glXGetProcAddress((const GLubyte *) "glImportSyncEXT");
if (!psglx->glFenceSyncProc || !psglx->glIsSyncProc || !psglx->glDeleteSyncProc
|| !psglx->glClientWaitSyncProc || !psglx->glWaitSyncProc
|| !psglx->glImportSyncEXT) {
printf_errf("(): Failed to acquire GLX sync functions.");
goto glx_init_end;
}
#endif
}
// Acquire FBConfigs
if (need_render && !glx_update_fbconfig(ps))
goto glx_init_end;
// 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:
cxfree(pvis);
if (!success)
glx_destroy(ps);
return success;
}
static void
glx_free_prog_main(session_t *ps, 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
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) {
glx_blur_pass_t *ppass = &ps->psglx->blur_passes[i];
if (ppass->frag_shader)
glDeleteShader(ppass->frag_shader);
if (ppass->prog)
glDeleteProgram(ppass->prog);
}
glx_free_prog_main(ps, &ps->o.glx_prog_win);
glx_check_err(ps);
// 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 (ps->psglx->context) {
glXDestroyContext(ps->dpy, ps->psglx->context);
ps->psglx->context = NULL;
}
free(ps->psglx);
ps->psglx = NULL;
}
/**
* Reinitialize GLX.
*/
bool
glx_reinit(session_t *ps, bool need_render) {
// Reinitialize VSync as well
vsync_deinit(ps);
glx_destroy(ps);
if (!glx_init(ps, need_render)) {
printf_errf("(): Failed to initialize GLX.");
return false;
}
if (!vsync_init(ps)) {
printf_errf("(): Failed to initialize VSync.");
return false;
}
return true;
}
/**
* 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_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) {
printf_errf("(): Failed to generate Framebuffer. Cannot do "
"multi-pass blur with GLX backend.");
return false;
}
glDeleteFramebuffers(1, &fbo);
}
{
char *lc_numeric_old = mstrcpy(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 = mstrcpy("");
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 = calloc(len, sizeof(char));
if (!shader_str) {
printf_errf("(): Failed to allocate %d bytes for shader string.", len);
return false;
}
{
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) {
printf_errf("(): Failed to create fragment shader %d.", i);
return false;
}
// Build program
ppass->prog = glx_create_program(&ppass->frag_shader, 1);
if (!ppass->prog) {
printf_errf("(): 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) { \
printf_errf("(): Failed to get location of %d-th uniform '" name "'. Might be troublesome.", 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;
}
/**
* Load a GLSL main program from shader strings.
*/
bool
glx_load_prog_main(session_t *ps,
const char *vshader_str, const char *fshader_str,
glx_prog_main_t *pprogram) {
assert(pprogram);
// Build program
pprogram->prog = glx_create_program_from_str(vshader_str, fshader_str);
if (!pprogram->prog) {
printf_errf("(): 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) { \
printf_errf("(): 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);
#undef P_GET_UNIFM_LOC
glx_check_err(ps);
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,
unsigned width, unsigned height, unsigned depth) {
if (ps->o.backend != BKEND_GLX)
return true;
if (!pixmap) {
printf_errf("(%#010x): Binding to an empty pixmap. 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 = malloc(sizeof(glx_texture_t));
allocchk(ptex);
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)) {
printf_errf("(%#010x): Failed to query Pixmap info.", pixmap);
return false;
}
if (depth > OPENGL_MAX_DEPTH) {
printf_errf("(%d): Requested depth higher than %d.", depth,
OPENGL_MAX_DEPTH);
return false;
}
}
const glx_fbconfig_t *pcfg = ps->psglx->fbconfigs[depth];
if (!pcfg) {
printf_errf("(%d): Couldn't find FBConfig with requested depth.", depth);
return false;
}
// 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 & 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;
#ifdef DEBUG_GLX
printf_dbgf("(): depth %d, tgt %#x, rgba %d\n", depth, tex_tgt,
(GLX_TEXTURE_FORMAT_RGBA_EXT == pcfg->texture_fmt));
#endif
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) {
printf_errf("(): 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) {
printf_errf("(): 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;
}
/**
* @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);
ps->psglx->glXReleaseTexImageProc(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;
}
glx_check_err(ps);
}
/**
* 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);
}
/**
* 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);
}
glx_check_err(ps);
}
#define P_PAINTREG_START(var) \
region_t reg_new; \
int nrects; \
const rect_t *rects; \
pixman_region32_init_rect(&reg_new, dx, dy, width, 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);
static inline GLuint
glx_gen_texture(session_t *ps, 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;
}
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);
}
/**
* 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->psglx->blur_passes[1].prog;
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;
#ifdef DEBUG_GLX
printf_dbgf("(): %d, %d, %d, %d\n", mdx, mdy, mwidth, mheight);
#endif
/*
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 = min_i(ps->o.resize_damage, inc_x);
inc_y = min_i(ps->o.resize_damage, inc_y);
mdx = max_i(dx - inc_x, 0);
mdy = max_i(dy - inc_y, 0);
int mdx2 = min_i(dx + width + inc_x, ps->root_width),
mdy2 = min_i(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(ps, tex_tgt, mwidth, mheight);
GLuint tex_scr = pbc->textures[0];
if (more_passes && !pbc->textures[1])
pbc->textures[1] = glx_gen_texture(ps, 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)) {
printf_errf("(): Failed to allocate texture.");
goto glx_blur_dst_end;
}
if (more_passes && !fbo) {
printf_errf("(): 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 (GL_TEXTURE_2D == tex_tgt) {
texfac_x /= mwidth;
texfac_y /= mheight;
}
// Paint it back
if (more_passes) {
glDisable(GL_STENCIL_TEST);
glDisable(GL_SCISSOR_TEST);
}
bool last_pass = false;
for (int i = 0; !last_pass; ++i) {
last_pass = !ps->psglx->blur_passes[i + 1].prog;
assert(i < MAX_BLUR_PASS - 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) {
static const GLenum DRAWBUFS[2] = { GL_COLOR_ATTACHMENT0 };
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_TEXTURE_2D, tex_scr2, 0);
glDrawBuffers(1, DRAWBUFS);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER)
!= GL_FRAMEBUFFER_COMPLETE) {
printf_errf("(): Framebuffer attachment failed.");
goto glx_blur_dst_end;
}
}
else {
static const GLenum DRAWBUFS[2] = { GL_BACK };
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glDrawBuffers(1, DRAWBUFS);
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) {
const GLfloat rx = (crect.x1 - mdx) * texfac_x;
const GLfloat ry = (mheight - (crect.y1 - mdy)) * texfac_y;
const GLfloat rxe = rx + (crect.x2 - crect.x1) * texfac_x;
const GLfloat rye = ry - (crect.y2 - crect.y1) * texfac_y;
GLfloat rdx = crect.x1 - mdx;
GLfloat rdy = mheight - crect.y1 + mdy;
if (last_pass) {
rdx = crect.x1;
rdy = ps->root_height - crect.y1;
}
GLfloat rdxe = rdx + (crect.x2 - crect.x1);
GLfloat rdye = rdy - (crect.y2 - crect.y1);
#ifdef DEBUG_GLX
printf_dbgf("(): %f, %f, %f, %f -> %f, %f, %f, %f\n", rx, ry, rxe, rye, rdx, rdy, rdxe, rdye);
#endif
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);
}
glx_check_err(ps);
return ret;
}
bool
glx_dim_dst(session_t *ps, int dx, int dy, int width, int height, float 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();
}
glEnd();
glColor4f(0.0f, 0.0f, 0.0f, 0.0f);
glDisable(GL_BLEND);
glx_check_err(ps);
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) {
printf_errf("(): Missing texture.");
return false;
}
argb = argb || (GLX_TEXTURE_FORMAT_RGBA_EXT ==
ps->psglx->fbconfigs[ptex->depth]->texture_fmt);
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);
glColor4f(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);
if (pprogram->unifm_opacity >= 0)
glUniform1f(pprogram->unifm_opacity, opacity);
if (pprogram->unifm_invert_color >= 0)
glUniform1i(pprogram->unifm_invert_color, neg);
if (pprogram->unifm_tex >= 0)
glUniform1i(pprogram->unifm_tex, 0);
}
#ifdef DEBUG_GLX
printf_dbgf("(): Draw: %d, %d, %d, %d -> %d, %d (%d, %d) z %d\n", x, y, width, height, dx, dy, ptex->width, ptex->height, z);
#endif
// 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) {
// XXX explain these variables
GLfloat rx = (double) (crect.x1 - dx + x);
GLfloat ry = (double) (crect.y1 - dy + y);
GLfloat rxe = rx + (double) (crect.x2 - crect.x1);
GLfloat rye = ry + (double) (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 / ptex->width;
ry = ry / ptex->height;
rxe = rxe / ptex->width;
rye = rye / ptex->height;
}
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 = 1.0 - ry;
rye = 1.0 - rye;
}
#ifdef DEBUG_GLX
printf_dbgf("(): Rect %d: %f, %f, %f, %f -> %d, %d, %d, %d\n", ri, rx, ry, rxe, rye, rdx, rdy, rdxe, rdye);
#endif
#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);
glx_check_err(ps);
return true;
}
/**
* @brief Get tightly packed RGB888 data from GL front buffer.
*
* Don't expect any sort of decent performance.
*
* @returns tightly packed RGB888 data of the size of the screen,
* to be freed with `free()`
*/
unsigned char *
glx_take_screenshot(session_t *ps, int *out_length) {
int length = 3 * ps->root_width * ps->root_height;
GLint unpack_align_old = 0;
glGetIntegerv(GL_UNPACK_ALIGNMENT, &unpack_align_old);
assert(unpack_align_old > 0);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
unsigned char *buf = cmalloc(length, unsigned char);
glReadBuffer(GL_FRONT);
glReadPixels(0, 0, ps->root_width, ps->root_height, GL_RGB,
GL_UNSIGNED_BYTE, buf);
glReadBuffer(GL_BACK);
glPixelStorei(GL_UNPACK_ALIGNMENT, unpack_align_old);
if (out_length)
*out_length = sizeof(unsigned char) * length;
return buf;
}
GLuint
glx_create_shader(GLenum shader_type, const char *shader_str) {
#ifdef DEBUG_GLX_GLSL
printf("glx_create_shader(): ===\n%s\n===\n", shader_str);
fflush(stdout);
#endif
bool success = false;
GLuint shader = glCreateShader(shader_type);
if (!shader) {
printf_errf("(): Failed to create shader with type %#x.", shader_type);
goto glx_create_shader_end;
}
glShaderSource(shader, 1, &shader_str, NULL);
glCompileShader(shader);
// Get shader status
{
GLint status = GL_FALSE;
glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
if (GL_FALSE == status) {
GLint log_len = 0;
glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &log_len);
if (log_len) {
char log[log_len + 1];
glGetShaderInfoLog(shader, log_len, NULL, log);
printf_errf("(): Failed to compile shader with type %d: %s",
shader_type, log);
}
goto glx_create_shader_end;
}
}
success = true;
glx_create_shader_end:
if (shader && !success) {
glDeleteShader(shader);
shader = 0;
}
return shader;
}
GLuint
glx_create_program(const GLuint * const shaders, int nshaders) {
bool success = false;
GLuint program = glCreateProgram();
if (!program) {
printf_errf("(): Failed to create program.");
goto glx_create_program_end;
}
for (int i = 0; i < nshaders; ++i)
glAttachShader(program, shaders[i]);
glLinkProgram(program);
// Get program status
{
GLint status = GL_FALSE;
glGetProgramiv(program, GL_LINK_STATUS, &status);
if (GL_FALSE == status) {
GLint log_len = 0;
glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_len);
if (log_len) {
char log[log_len + 1];
glGetProgramInfoLog(program, log_len, NULL, log);
printf_errf("(): Failed to link program: %s", log);
}
goto glx_create_program_end;
}
}
success = true;
glx_create_program_end:
if (program) {
for (int i = 0; i < nshaders; ++i)
glDetachShader(program, shaders[i]);
}
if (program && !success) {
glDeleteProgram(program);
program = 0;
}
return program;
}
/**
* @brief Create a program from vertex and fragment shader strings.
*/
GLuint
glx_create_program_from_str(const char *vert_shader_str,
const char *frag_shader_str) {
GLuint vert_shader = 0;
GLuint frag_shader = 0;
GLuint prog = 0;
if (vert_shader_str)
vert_shader = glx_create_shader(GL_VERTEX_SHADER, vert_shader_str);
if (frag_shader_str)
frag_shader = glx_create_shader(GL_FRAGMENT_SHADER, frag_shader_str);
{
GLuint shaders[2];
unsigned int count = 0;
if (vert_shader)
shaders[count++] = vert_shader;
if (frag_shader)
shaders[count++] = frag_shader;
assert(count <= sizeof(shaders) / sizeof(shaders[0]));
if (count)
prog = glx_create_program(shaders, count);
}
if (vert_shader)
glDeleteShader(vert_shader);
if (frag_shader)
glDeleteShader(frag_shader);
return prog;
}
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