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#include <dlfcn.h>
#include "xenon.h"
#include "render.h"
#include "draw.h"
#include <GL/glx.h>
typedef struct xenon_libX11
{
void* handle;
int (*XFlush)(Display*);
Display* (*XOpenDisplay)(const char*);
Colormap (*XCreateColormap)(Display*, Window, Visual*, int);
Window (*XCreateWindow)(Display*, Window, int, int, unsigned int, unsigned int, unsigned int, int, unsigned int, Visual*, unsigned long, XSetWindowAttributes*);
int (*XMapRaised)(Display*, Window);
}
xenon_libX11;
static xenon_libX11 libX11;
typedef struct xenon_libGL
{
void* handle;
XVisualInfo* (*glXChooseVisual) (Display*, int, int*);
GLXContext (*glXCreateContext) (Display*, XVisualInfo*, GLXContext, Bool);
Bool (*glXMakeCurrent) (Display*, GLXDrawable, GLXContext );
void (*glDrawPixels) (GLsizei, GLsizei, GLenum, GLenum, const GLvoid *);
void (*glRasterPos2i) (GLint, GLint);
void (*glViewport) (GLint, GLint, GLsizei, GLsizei);
void (*glMatrixMode) (GLenum);
void (*glLoadIdentity) (void);
void (*glOrtho) (GLdouble, GLdouble, GLdouble, GLdouble, GLdouble, GLdouble);
}
xenon_libGL;
static xenon_libGL libGL;
static void render_init_libs()
{
libX11.handle = dlopen("/usr/lib64/libX11.so.6", RTLD_LAZY);
if (!libX11.handle)
libX11.handle = dlopen("/usr/lib/libX11.so.6", RTLD_LAZY);
if (!libX11.handle)
printf("can't open libX11\n");
libX11.XFlush = dlsym(libX11.handle, "XFlush");
libX11.XOpenDisplay = dlsym(libX11.handle, "XOpenDisplay");
libX11.XCreateColormap = dlsym(libX11.handle, "XCreateColormap");
libX11.XCreateWindow = dlsym(libX11.handle, "XCreateWindow");
libX11.XMapRaised = dlsym(libX11.handle, "XMapRaised");
libGL.handle = dlopen("/usr/lib64/libGL.so", RTLD_LAZY);
if (!libGL.handle)
libGL.handle = dlopen("/usr/lib/libGL.so", RTLD_LAZY);
if (!libGL.handle)
printf("can't open libGL\n");
libGL.glXChooseVisual = dlsym(libGL.handle, "glXChooseVisual");
libGL.glXCreateContext = dlsym(libGL.handle, "glXCreateContext");
libGL.glXMakeCurrent = dlsym(libGL.handle, "glXMakeCurrent");
libGL.glDrawPixels = dlsym(libGL.handle, "glDrawPixels");
libGL.glRasterPos2i = dlsym(libGL.handle, "glRasterPos2i");
libGL.glViewport = dlsym(libGL.handle, "glViewport");
libGL.glMatrixMode = dlsym(libGL.handle, "glMatrixMode");
libGL.glLoadIdentity = dlsym(libGL.handle, "glLoadIdentity");
libGL.glOrtho = dlsym(libGL.handle, "glOrtho");
}
void render_init(int w, int h)
{
render_init_libs();
Display* dpy = libX11.XOpenDisplay(0);
int screen = DefaultScreen(dpy);
GLint glxattr[] = {GLX_RGBA, None};
XVisualInfo* vi = libGL.glXChooseVisual(dpy, screen, glxattr);
GLXContext ctx = libGL.glXCreateContext(dpy, vi, 0, GL_TRUE);
XSetWindowAttributes attr;
attr.colormap = libX11.XCreateColormap(dpy, RootWindow(dpy, vi->screen), vi->visual, AllocNone);
attr.event_mask = ExposureMask | KeyPressMask | ButtonPressMask | StructureNotifyMask;
Window win = libX11.XCreateWindow(dpy, RootWindow(dpy, vi->screen), 0, 0, w, h, 0, vi->depth, InputOutput, vi->visual, CWColormap | CWEventMask, &attr);
libX11.XMapRaised(dpy, win);
libGL.glXMakeCurrent(dpy, win, ctx);
libGL.glViewport(0, 0, w, h);
libGL.glMatrixMode( GL_PROJECTION );
libGL.glLoadIdentity();
libGL.glOrtho(0.0, (GLfloat)w, 0.0, (GLfloat)h, 0.0, 2.0);
libGL.glMatrixMode( GL_MODELVIEW );
libGL.glLoadIdentity();
screen_rect.x = 0;
screen_rect.y = 0;
screen_rect.w = w;
screen_rect.h = h;
pixels = (unsigned char*) calloc (1, w * h * 4);
render_update(screen_rect);
}
void render_update(xenon_rect r)
{
for(int j = r.y ; j < r.y + r.h ; j++)
{
libGL.glRasterPos2i(r.x, r.h - j - 1);
libGL.glDrawPixels(r.w, 1, GL_RGBA, GL_UNSIGNED_BYTE, pixels + (r.x + j * screen_rect.w) * 4 );
}
}
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