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tdebase/opengl.c

982 lines
27 KiB

/*
* Compton - a compositor for X11
*
* Based on `xcompmgr` - Copyright (c) 2003, Keith Packard
*
* Copyright (c) 2011-2013, Christopher Jeffrey
* See LICENSE for more information.
*
*/
#include "opengl.h"
/**
* 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;
// Get GLX context
ps->glx_context = glXCreateContext(ps->dpy, pvis, None, GL_TRUE);
if (!ps->glx_context) {
printf_errf("(): Failed to get GLX context.");
goto glx_init_end;
}
// Attach GLX context
if (!glXMakeCurrent(ps->dpy, get_tgt_window(ps), ps->glx_context)) {
printf_errf("(): Failed to attach GLX context.");
goto glx_init_end;
}
// 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)
ps->glx_has_texture_non_power_of_two = glx_hasglext(ps,
"GL_ARB_texture_non_power_of_two");
// Acquire function addresses
if (need_render) {
ps->glXBindTexImageProc = (f_BindTexImageEXT)
glXGetProcAddress((const GLubyte *) "glXBindTexImageEXT");
ps->glXReleaseTexImageProc = (f_ReleaseTexImageEXT)
glXGetProcAddress((const GLubyte *) "glXReleaseTexImageEXT");
if (!ps->glXBindTexImageProc || !ps->glXReleaseTexImageProc) {
printf_errf("(): Failed to acquire glXBindTexImageEXT() / glXReleaseTexImageEXT().");
goto glx_init_end;
}
if (ps->o.glx_use_copysubbuffermesa) {
ps->glXCopySubBufferProc = (f_CopySubBuffer)
glXGetProcAddress((const GLubyte *) "glXCopySubBufferMESA");
if (!ps->glXCopySubBufferProc) {
printf_errf("(): Failed to acquire glXCopySubBufferMESA().");
goto glx_init_end;
}
}
}
// Acquire FBConfigs
if (need_render && !glx_update_fbconfig(ps))
goto glx_init_end;
if (need_render) {
glx_on_root_change(ps);
// glEnable(GL_DEPTH_TEST);
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:
if (pvis)
XFree(pvis);
if (!success)
glx_destroy(ps);
return success;
}
/**
* Destroy GLX related resources.
*/
void
glx_destroy(session_t *ps) {
#ifdef CONFIG_VSYNC_OPENGL_GLSL
// Free GLSL shaders/programs
if (ps->glx_frag_shader_blur)
glDeleteShader(ps->glx_frag_shader_blur);
if (ps->glx_prog_blur)
glDeleteProgram(ps->glx_prog_blur);
#endif
// Free FBConfigs
for (int i = 0; i <= OPENGL_MAX_DEPTH; ++i) {
free(ps->glx_fbconfigs[i]);
ps->glx_fbconfigs[i] = NULL;
}
// Destroy GLX context
if (ps->glx_context) {
glXDestroyContext(ps->dpy, ps->glx_context);
ps->glx_context = 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) {
#ifdef CONFIG_VSYNC_OPENGL_GLSL
if (ps->o.glx_no_stencil) {
printf_errf("(): I'm afraid blur background won't work so well without "
"stencil buffer support.");
return false;
}
// Build shader
static const char *FRAG_SHADER_BLUR =
"#version 110\n"
"uniform float offset_x;\n"
"uniform float offset_y;\n"
"uniform float factor_center;\n"
"uniform sampler2D tex_scr;\n"
"\n"
"void main() {\n"
" vec4 sum = vec4(0.0, 0.0, 0.0, 0.0);\n"
" sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x - offset_x, gl_TexCoord[0].y - offset_y));\n"
" sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x - offset_x, gl_TexCoord[0].y));\n"
" sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x - offset_x, gl_TexCoord[0].y + offset_y));\n"
" sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x, gl_TexCoord[0].y - offset_y));\n"
" sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x, gl_TexCoord[0].y)) * factor_center;\n"
" sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x, gl_TexCoord[0].y + offset_y));\n"
" sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x + offset_x, gl_TexCoord[0].y - offset_y));\n"
" sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x + offset_x, gl_TexCoord[0].y));\n"
" sum += texture2D(tex_scr, vec2(gl_TexCoord[0].x + offset_x, gl_TexCoord[0].y + offset_y));\n"
" gl_FragColor = sum / (factor_center + 8.0);\n"
"}\n"
;
ps->glx_frag_shader_blur = glx_create_shader(GL_FRAGMENT_SHADER, FRAG_SHADER_BLUR);
if (!ps->glx_frag_shader_blur) {
printf_errf("(): Failed to create fragment shader.");
return false;
}
ps->glx_prog_blur = glx_create_program(&ps->glx_frag_shader_blur, 1);
if (!ps->glx_prog_blur) {
printf_errf("(): Failed to create GLSL program.");
return false;
}
#define P_GET_UNIFM_LOC(name, target) { \
ps->target = glGetUniformLocation(ps->glx_prog_blur, name); \
if (ps->target < 0) { \
printf_errf("(): Failed to get location of uniform '" name "'."); \
return false; \
} \
}
P_GET_UNIFM_LOC("factor_center", glx_prog_blur_unifm_factor_center);
P_GET_UNIFM_LOC("offset_x", glx_prog_blur_unifm_offset_x);
P_GET_UNIFM_LOC("offset_y", glx_prog_blur_unifm_offset_y);
#undef P_GET_UNIFM_LOC
return true;
#else
printf_errf("(): GLSL support not compiled in. Cannot do blur with GLX backend.");
return false;
#endif
}
/**
* @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->glx_fbconfigs[depth], pfbcfg) < 0) {
#ifdef DEBUG_GLX
printf_dbgf("(%d): %#x overrides %#x, target %#x.\n", depth, (unsigned) pfbcfg->cfg, (ps->glx_fbconfigs[depth] ? (unsigned) ps->glx_fbconfigs[depth]->cfg: 0), pfbcfg->texture_tgts);
#endif
if (!ps->glx_fbconfigs[depth]) {
ps->glx_fbconfigs[depth] = malloc(sizeof(glx_fbconfig_t));
allocchk(ps->glx_fbconfigs[depth]);
}
(*ps->glx_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 depth = 0, depth_alpha = 0, val = 0;
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.", (int) (pcur - pfbcfgs));
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.", (int) (pcur - pfbcfgs));
continue;
}
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;
if ((depth - depth_alpha) < 32 && rgb) {
fbinfo.texture_fmt = GLX_TEXTURE_FORMAT_RGB_EXT;
glx_update_fbconfig_bydepth(ps, depth - depth_alpha, &fbinfo);
}
if (rgba) {
fbinfo.texture_fmt = GLX_TEXTURE_FORMAT_RGBA_EXT;
glx_update_fbconfig_bydepth(ps, depth, &fbinfo);
}
}
if (pfbcfgs)
XFree(pfbcfgs);
// Sanity checks
if (!ps->glx_fbconfigs[ps->depth]) {
printf_errf("(): No FBConfig found for default depth %d.", ps->depth);
return false;
}
if (!ps->glx_fbconfigs[32]) {
printf_errf("(): No FBConfig found for depth 32. Expect crazy things.");
}
return true;
}
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;
#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;
}
/**
* Bind a X pixmap to an OpenGL texture.
*/
bool
glx_bind_pixmap(session_t *ps, glx_texture_t **pptex, Pixmap pixmap,
unsigned width, unsigned height, unsigned depth) {
if (!pixmap) {
printf_errf("(%#010lx): 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("(%#010lx): 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->glx_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->glx_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->glXReleaseTexImageProc(ps->dpy, ptex->glpixmap, GLX_FRONT_LEFT_EXT);
ps->glXBindTexImageProc(ps->dpy, ptex->glpixmap, GLX_FRONT_LEFT_EXT, NULL);
// Cleanup
glBindTexture(ptex->target, 0);
glDisable(ptex->target);
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->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;
}
}
/**
* Preprocess function before start painting.
*/
void
glx_paint_pre(session_t *ps, XserverRegion *preg) {
ps->glx_z = 0.0;
// glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// OpenGL doesn't support partial repaint without GLX_MESA_copy_sub_buffer,
// we could redraw the whole screen or copy unmodified pixels from
// front buffer with --glx-copy-from-front.
if (ps->o.glx_use_copysubbuffermesa || !*preg) {
}
else if (!ps->o.glx_copy_from_front) {
free_region(ps, preg);
}
else {
{
XserverRegion reg_copy = XFixesCreateRegion(ps->dpy, NULL, 0);
XFixesSubtractRegion(ps->dpy, reg_copy, ps->screen_reg, *preg);
glx_set_clip(ps, reg_copy);
free_region(ps, &reg_copy);
}
{
GLfloat raster_pos[4];
glGetFloatv(GL_CURRENT_RASTER_POSITION, raster_pos);
glReadBuffer(GL_FRONT);
glRasterPos2f(0.0, 0.0);
glCopyPixels(0, 0, ps->root_width, ps->root_height, GL_COLOR);
glReadBuffer(GL_BACK);
glRasterPos4fv(raster_pos);
}
}
glx_set_clip(ps, *preg);
}
/**
* Set clipping region on the target window.
*/
void
glx_set_clip(session_t *ps, XserverRegion reg) {
// Quit if we aren't using stencils
if (ps->o.glx_no_stencil)
return;
static XRectangle rect_blank = {
.x = 0, .y = 0, .width = 0, .height = 0
};
glDisable(GL_STENCIL_TEST);
glDisable(GL_SCISSOR_TEST);
if (!reg)
return;
int nrects = 0;
XRectangle *rects = XFixesFetchRegion(ps->dpy, reg, &nrects);
if (!nrects) {
if (rects) XFree(rects);
nrects = 1;
rects = &rect_blank;
}
assert(nrects);
if (1 == nrects) {
glEnable(GL_SCISSOR_TEST);
glScissor(rects[0].x, ps->root_height - rects[0].y - rects[0].height,
rects[0].width, rects[0].height);
}
else {
glEnable(GL_STENCIL_TEST);
glClear(GL_STENCIL_BUFFER_BIT);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glDepthMask(GL_FALSE);
glStencilOp(GL_REPLACE, GL_KEEP, GL_KEEP);
glBegin(GL_QUADS);
for (int i = 0; i < nrects; ++i) {
GLint rx = rects[i].x;
GLint ry = ps->root_height - rects[i].y;
GLint rxe = rx + rects[i].width;
GLint rye = ry - rects[i].height;
GLint z = 0;
#ifdef DEBUG_GLX
printf_dbgf("(): Rect %d: %d, %d, %d, %d\n", i, rx, ry, rxe, rye);
#endif
glVertex3i(rx, ry, z);
glVertex3i(rxe, ry, z);
glVertex3i(rxe, rye, z);
glVertex3i(rx, rye, z);
}
glEnd();
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glDepthMask(GL_TRUE);
}
if (rects && &rect_blank != rects)
XFree(rects);
}
bool
glx_blur_dst(session_t *ps, int dx, int dy, int width, int height, float z,
GLfloat factor_center) {
// Read destination pixels into a texture
GLuint tex_scr = 0;
glGenTextures(1, &tex_scr);
if (!tex_scr) {
printf_errf("(): Failed to allocate texture.");
return false;
}
GLenum tex_tgt = GL_TEXTURE_RECTANGLE;
if (ps->glx_has_texture_non_power_of_two)
tex_tgt = GL_TEXTURE_2D;
glEnable(tex_tgt);
glBindTexture(tex_tgt, tex_scr);
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_BGRA, GL_UNSIGNED_BYTE, NULL);
glCopyTexSubImage2D(tex_tgt, 0, 0, 0, dx, ps->root_height - dy - height, width, height);
#ifdef DEBUG_GLX
printf_dbgf("(): %d, %d, %d, %d\n", dx, ps->root_height - dy - height, width, height);
#endif
// Paint it back
// 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);
#ifdef CONFIG_VSYNC_OPENGL_GLSL
glUseProgram(ps->glx_prog_blur);
glUniform1f(ps->glx_prog_blur_unifm_offset_x, 1.0f / width);
glUniform1f(ps->glx_prog_blur_unifm_offset_y, 1.0f / height);
glUniform1f(ps->glx_prog_blur_unifm_factor_center, factor_center);
#endif
glBegin(GL_QUADS);
{
const GLfloat rx = 0.0;
const GLfloat ry = 1.0;
const GLfloat rxe = 1.0;
const GLfloat rye = 0.0;
const GLint rdx = dx;
const GLint rdy = ps->root_height - dy;
const GLint rdxe = rdx + width;
const GLint rdye = rdy - height;
#ifdef DEBUG_GLX
printf_dbgf("(): %f, %f, %f, %f -> %d, %d, %d, %d\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);
}
glEnd();
#ifdef CONFIG_VSYNC_OPENGL_GLSL
glUseProgram(0);
#endif
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
glBindTexture(tex_tgt, 0);
glDeleteTextures(1, &tex_scr);
glDisable(tex_tgt);
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 neg, XserverRegion reg_tgt) {
if (!ptex || !ptex->texture) {
printf_errf("(): Missing texture.");
return false;
}
// Enable blending if needed
if (opacity < 1.0 || GLX_TEXTURE_FORMAT_RGBA_EXT ==
ps->glx_fbconfigs[ptex->depth]->texture_fmt) {
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 premulitplied 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);
}
// Color negation
if (neg) {
// Simple color negation
if (!glIsEnabled(GL_BLEND)) {
glEnable(GL_COLOR_LOGIC_OP);
glLogicOp(GL_COPY_INVERTED);
}
// Blending color negation
else {
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);
}
}
{
XserverRegion reg_new = None;
XRectangle rec_all = {
.x = dx,
.y = dy,
.width = width,
.height = height
};
XRectangle *rects = &rec_all;
int nrects = 1;
#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
// On no-stencil mode, calculate painting region here instead of relying
// on stencil buffer
if (ps->o.glx_no_stencil && reg_tgt) {
reg_new = XFixesCreateRegion(ps->dpy, &rec_all, 1);
XFixesIntersectRegion(ps->dpy, reg_new, reg_new, reg_tgt);
nrects = 0;
rects = XFixesFetchRegion(ps->dpy, reg_new, &nrects);
}
glEnable(ptex->target);
glBindTexture(ptex->target, ptex->texture);
glBegin(GL_QUADS);
for (int i = 0; i < nrects; ++i) {
GLfloat rx = (double) (rects[i].x - dx + x) / ptex->width;
GLfloat ry = (double) (rects[i].y - dy + y) / ptex->height;
GLfloat rxe = rx + (double) rects[i].width / ptex->width;
GLfloat rye = ry + (double) rects[i].height / ptex->height;
GLint rdx = rects[i].x;
GLint rdy = ps->root_height - rects[i].y;
GLint rdxe = rdx + rects[i].width;
GLint rdye = rdy - rects[i].height;
// 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", i, rx, ry, rxe, rye, rdx, rdy, rdxe, rdye);
#endif
glTexCoord2f(rx, ry);
glVertex3i(rdx, rdy, z);
glTexCoord2f(rxe, ry);
glVertex3i(rdxe, rdy, z);
glTexCoord2f(rxe, rye);
glVertex3i(rdxe, rdye, z);
glTexCoord2f(rx, rye);
glVertex3i(rdx, rdye, z);
}
glEnd();
if (rects && rects != &rec_all)
XFree(rects);
free_region(ps, &reg_new);
}
// 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);
return true;
}
/**
* Swap buffer with glXCopySubBufferMESA().
*/
void
glx_swap_copysubbuffermesa(session_t *ps, XserverRegion reg) {
int nrects = 0;
XRectangle *rects = XFixesFetchRegion(ps->dpy, reg, &nrects);
if (1 == nrects && rect_is_fullscreen(ps, rects[0].x, rects[0].y,
rects[0].width, rects[0].height)) {
glXSwapBuffers(ps->dpy, get_tgt_window(ps));
}
else {
glx_set_clip(ps, None);
for (int i = 0; i < nrects; ++i) {
const int x = rects[i].x;
const int y = ps->root_height - rects[i].y - rects[i].height;
const int wid = rects[i].width;
const int hei = rects[i].height;
#ifdef DEBUG_GLX
printf_dbgf("(): %d, %d, %d, %d\n", x, y, wid, hei);
#endif
ps->glXCopySubBufferProc(ps->dpy, get_tgt_window(ps), x, y, wid, hei);
}
}
if (rects)
XFree(rects);
}
#ifdef CONFIG_VSYNC_OPENGL_GLSL
GLuint
glx_create_shader(GLenum shader_type, const char *shader_str) {
bool success = false;
GLuint shader = glCreateShader(shader_type);
if (!shader) {
printf_errf("(): Failed to create shader with type %d.", 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;
}
#endif