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#include "../include/gl.h"
#include "../include/library_loader.h"
#include <string.h>
static bool gsr_gl_create_window(gsr_gl *self) {
const int attr[] = {
GLX_RENDER_TYPE, GLX_RGBA_BIT,
GLX_DRAWABLE_TYPE, GLX_WINDOW_BIT,
GLX_DOUBLEBUFFER, True,
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_ALPHA_SIZE, 8,
GLX_DEPTH_SIZE, 0,
None
};
GLXFBConfig *fbconfigs = NULL;
XVisualInfo *visual_info = NULL;
GLXFBConfig fbconfig = NULL;
Colormap colormap = None;
GLXContext gl_context = NULL;
Window window = None;
int numfbconfigs = 0;
fbconfigs = self->glXChooseFBConfig(self->dpy, DefaultScreen(self->dpy), attr, &numfbconfigs);
for(int i = 0; i < numfbconfigs; i++) {
visual_info = self->glXGetVisualFromFBConfig(self->dpy, fbconfigs[i]);
if(!visual_info)
continue;
fbconfig = fbconfigs[i];
break;
}
if(!visual_info) {
fprintf(stderr, "gsr error: gsr_gl_create_window failed: no appropriate visual found\n");
XFree(fbconfigs);
return false;
}
/* TODO: Core profile? GLX_CONTEXT_CORE_PROFILE_BIT_ARB. */
/* TODO: Remove need for 4.2 when copy texture function has been removed. */
int context_attribs[] = {
GLX_CONTEXT_MAJOR_VERSION_ARB, 4,
GLX_CONTEXT_MINOR_VERSION_ARB, 2,
GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB,
None
};
gl_context = self->glXCreateContextAttribsARB(self->dpy, fbconfig, NULL, True, context_attribs);
if(!gl_context) {
fprintf(stderr, "gsr error: gsr_gl_create_window failed: failed to create gl context\n");
goto fail;
}
colormap = XCreateColormap(self->dpy, DefaultRootWindow(self->dpy), visual_info->visual, AllocNone);
if(!colormap) {
fprintf(stderr, "gsr error: gsr_gl_create_window failed: failed to create x11 colormap\n");
goto fail;
}
XSetWindowAttributes window_attr;
window_attr.colormap = colormap;
// TODO: Is there a way to remove the need to create a window?
window = XCreateWindow(self->dpy, DefaultRootWindow(self->dpy), 0, 0, 1, 1, 0, visual_info->depth, InputOutput, visual_info->visual, CWColormap, &window_attr);
if(!window) {
fprintf(stderr, "gsr error: gsr_gl_create_window failed: failed to create gl window\n");
goto fail;
}
if(!self->glXMakeContextCurrent(self->dpy, window, window, gl_context)) {
fprintf(stderr, "gsr error: gsr_gl_create_window failed: failed to make gl context current\n");
goto fail;
}
self->fbconfigs = fbconfigs;
self->visual_info = visual_info;
self->colormap = colormap;
self->gl_context = gl_context;
self->window = window;
return true;
fail:
if(window)
XDestroyWindow(self->dpy, window);
if(colormap)
XFreeColormap(self->dpy, colormap);
if(gl_context)
self->glXDestroyContext(self->dpy, gl_context);
if(visual_info)
XFree(visual_info);
XFree(fbconfigs);
return False;
}
bool gsr_gl_load(gsr_gl *self, Display *dpy) {
memset(self, 0, sizeof(gsr_gl));
self->dpy = dpy;
dlerror(); /* clear */
void *lib = dlopen("libGL.so.1", RTLD_LAZY);
if(!lib) {
fprintf(stderr, "gsr error: gsr_gl_load: failed to load libGL.so.1, error: %s\n", dlerror());
return false;
}
dlsym_assign optional_dlsym[] = {
{ (void**)&self->glClearTexImage, "glClearTexImage" },
{ (void**)&self->glXSwapIntervalEXT, "glXSwapIntervalEXT" },
{ (void**)&self->glXSwapIntervalMESA, "glXSwapIntervalMESA" },
{ (void**)&self->glXSwapIntervalSGI, "glXSwapIntervalSGI" },
{ NULL, NULL }
};
dlsym_load_list_optional(lib, optional_dlsym);
dlsym_assign required_dlsym[] = {
{ (void**)&self->glXCreatePixmap, "glXCreatePixmap" },
{ (void**)&self->glXDestroyPixmap, "glXDestroyPixmap" },
{ (void**)&self->glXBindTexImageEXT, "glXBindTexImageEXT" },
{ (void**)&self->glXReleaseTexImageEXT, "glXReleaseTexImageEXT" },
{ (void**)&self->glXChooseFBConfig, "glXChooseFBConfig" },
{ (void**)&self->glXGetVisualFromFBConfig, "glXGetVisualFromFBConfig" },
{ (void**)&self->glXCreateContextAttribsARB, "glXCreateContextAttribsARB" },
{ (void**)&self->glXMakeContextCurrent, "glXMakeContextCurrent" },
{ (void**)&self->glXDestroyContext, "glXDestroyContext" },
{ (void**)&self->glXSwapBuffers, "glXSwapBuffers" },
{ (void**)&self->glGetError, "glGetError" },
{ (void**)&self->glGetString, "glGetString" },
{ (void**)&self->glClear, "glClear" },
{ (void**)&self->glGenTextures, "glGenTextures" },
{ (void**)&self->glDeleteTextures, "glDeleteTextures" },
{ (void**)&self->glBindTexture, "glBindTexture" },
{ (void**)&self->glTexParameteri, "glTexParameteri" },
{ (void**)&self->glGetTexLevelParameteriv, "glGetTexLevelParameteriv" },
{ (void**)&self->glTexImage2D, "glTexImage2D" },
{ (void**)&self->glCopyImageSubData, "glCopyImageSubData" },
{ NULL, NULL }
};
if(!dlsym_load_list(lib, required_dlsym)) {
fprintf(stderr, "gsr error: gsr_gl_load failed: missing required symbols in libGL.so.1\n");
dlclose(lib);
memset(self, 0, sizeof(gsr_gl));
return false;
}
if(!gsr_gl_create_window(self)) {
dlclose(lib);
memset(self, 0, sizeof(gsr_gl));
return false;
}
self->library = lib;
return true;
}
bool gsr_gl_make_context_current(gsr_gl *self) {
return self->glXMakeContextCurrent(self->dpy, self->window, self->window, self->gl_context);
}
void gsr_gl_unload(gsr_gl *self) {
if(self->window) {
XDestroyWindow(self->dpy, self->window);
self->window = None;
}
if(self->colormap) {
XFreeColormap(self->dpy, self->colormap);
self->colormap = None;
}
if(self->gl_context) {
self->glXDestroyContext(self->dpy, self->gl_context);
self->gl_context = NULL;
}
if(self->visual_info) {
XFree(self->visual_info);
self->visual_info = NULL;
}
if(self->fbconfigs) {
XFree(self->fbconfigs);
self->fbconfigs = NULL;
}
if(self->library) {
dlclose(self->library);
memset(self, 0, sizeof(gsr_gl));
}
}
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