1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/main.c	Tue Nov 03 00:42:08 2015 +0200
     1.3 @@ -0,0 +1,323 @@
     1.4 +#include <stdio.h>
     1.5 +#include <stdlib.h>
     1.6 +#include <X11/Xlib.h>
     1.7 +#include <X11/extensions/shape.h>
     1.8 +#include <GL/glx.h>
     1.9 +#include "image.h"
    1.10 +#include "texture.h"
    1.11 +
    1.12 +void redraw(void);
    1.13 +void reshape(int x, int y);
    1.14 +int handle_event(XEvent *ev);
    1.15 +
    1.16 +/* X helper functions */
    1.17 +Window create_window(int xsz, int ysz);
    1.18 +void set_window_title(Window win, const char *title);
    1.19 +int get_window_shape(Window win, struct image *img);
    1.20 +
    1.21 +Display *dpy;
    1.22 +Window win;
    1.23 +GLXContext ctx;
    1.24 +int width, height;
    1.25 +int mapped;
    1.26 +int redisp_pending;
    1.27 +Atom xa_wm_prot, xa_wm_del_win;
    1.28 +struct image img;
    1.29 +struct texture tex;
    1.30 +struct texture chess_tex;
    1.31 +float aspect;
    1.32 +
    1.33 +unsigned int target_xid = 0;
    1.34 +
    1.35 +int main(int argc, char **argv)
    1.36 +{
    1.37 +	int event_base, error_base;
    1.38 +	char *endp;
    1.39 +	struct image chess_img;
    1.40 +
    1.41 +	if(!argv[1]) {
    1.42 +		fprintf(stderr, "pass the window id to use\n");
    1.43 +		return 1;
    1.44 +	}
    1.45 +	if(!(target_xid = strtol(argv[1], &endp, 0))) {
    1.46 +		fprintf(stderr, "invalid argument: %s\n", argv[1]);
    1.47 +		return 1;
    1.48 +	}
    1.49 +
    1.50 +	if(!(dpy = XOpenDisplay(0))) {
    1.51 +		fprintf(stderr, "failed to open display\n");
    1.52 +		return 1;
    1.53 +	}
    1.54 +	xa_wm_prot = XInternAtom(dpy, "WM_PROTOCOLS", False);
    1.55 +	xa_wm_del_win = XInternAtom(dpy, "WM_DELETE_WINDOW", False);
    1.56 +
    1.57 +	if(!XShapeQueryExtension(dpy, &event_base, &error_base)) {
    1.58 +		fprintf(stderr, "shape extension unsupported by this X server\n");
    1.59 +		XCloseDisplay(dpy);
    1.60 +		return 1;
    1.61 +	}
    1.62 +	if(get_window_shape(target_xid, &img) == -1) {
    1.63 +		XCloseDisplay(dpy);
    1.64 +		return 1;
    1.65 +	}
    1.66 +
    1.67 +	if(!(win = create_window(1280, 800))) {
    1.68 +		return 1;
    1.69 +	}
    1.70 +
    1.71 +	image_texture(&tex, &img);
    1.72 +
    1.73 +	image_create(&chess_img, 256, 256);
    1.74 +	image_chess(&chess_img, 8, 255, 128, 64, 64, 128, 255);
    1.75 +	image_texture(&chess_tex, &chess_img);
    1.76 +	image_destroy(&chess_img);
    1.77 +
    1.78 +	for(;;) {
    1.79 +		XEvent ev;
    1.80 +		XNextEvent(dpy, &ev);
    1.81 +
    1.82 +		if(handle_event(&ev) == -1) {
    1.83 +			break;
    1.84 +		}
    1.85 +	}
    1.86 +
    1.87 +	XDestroyWindow(dpy, win);
    1.88 +	XCloseDisplay(dpy);
    1.89 +	return 0;
    1.90 +}
    1.91 +
    1.92 +void redraw(void)
    1.93 +{
    1.94 +	glClearColor(0.4, 0.4, 0.4, 1);
    1.95 +	glClear(GL_COLOR_BUFFER_BIT);
    1.96 +
    1.97 +	glMatrixMode(GL_MODELVIEW);
    1.98 +	glLoadIdentity();
    1.99 +
   1.100 +	glEnable(GL_TEXTURE_2D);
   1.101 +	glBindTexture(GL_TEXTURE_2D, chess_tex.id);
   1.102 +
   1.103 +
   1.104 +	/* background */
   1.105 +	glBegin(GL_QUADS);
   1.106 +	glTexCoord2f(0, 0); glVertex2f(-aspect, -1);
   1.107 +	glTexCoord2f(1, 0); glVertex2f(aspect, -1);
   1.108 +	glTexCoord2f(1, 1); glVertex2f(aspect, 1);
   1.109 +	glTexCoord2f(0, 1); glVertex2f(-aspect, 1);
   1.110 +	glEnd();
   1.111 +
   1.112 +	/* draw the window shape */
   1.113 +	glEnable(GL_BLEND);
   1.114 +	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
   1.115 +
   1.116 +	glBindTexture(GL_TEXTURE_2D, tex.id);
   1.117 +	glMatrixMode(GL_TEXTURE);
   1.118 +	glLoadIdentity();
   1.119 +	glScalef((float)tex.width / (float)tex.tex_width,
   1.120 +			(float)tex.height / (float)tex.tex_height,
   1.121 +			1.0);
   1.122 +
   1.123 +	glMatrixMode(GL_MODELVIEW);
   1.124 +	glPushMatrix();
   1.125 +	glScalef(0.7, 0.7, 0.7);
   1.126 +
   1.127 +	/* shadow */
   1.128 +	glPushMatrix();
   1.129 +	glTranslatef(0.1, -0.1, 0);
   1.130 +	glBegin(GL_QUADS);
   1.131 +	glColor3f(0, 0, 0);
   1.132 +	glTexCoord2f(0, 1); glVertex2f(-1, -1);
   1.133 +	glTexCoord2f(1, 1); glVertex2f(1, -1);
   1.134 +	glTexCoord2f(1, 0); glVertex2f(1, 1);
   1.135 +	glTexCoord2f(0, 0); glVertex2f(-1, 1);
   1.136 +	glEnd();
   1.137 +	glPopMatrix();
   1.138 +
   1.139 +	/* window */
   1.140 +	glBegin(GL_QUADS);
   1.141 +	glColor3f(1, 1, 0);
   1.142 +	glTexCoord2f(0, 1); glVertex2f(-1, -1);
   1.143 +	glTexCoord2f(1, 1); glVertex2f(1, -1);
   1.144 +	glTexCoord2f(1, 0); glVertex2f(1, 1);
   1.145 +	glTexCoord2f(0, 0); glVertex2f(-1, 1);
   1.146 +	glEnd();
   1.147 +
   1.148 +	glMatrixMode(GL_TEXTURE);
   1.149 +	glLoadIdentity();
   1.150 +	glMatrixMode(GL_MODELVIEW);
   1.151 +	glPopMatrix();
   1.152 +
   1.153 +	glDisable(GL_BLEND);
   1.154 +
   1.155 +	glXSwapBuffers(dpy, win);
   1.156 +}
   1.157 +
   1.158 +void reshape(int x, int y)
   1.159 +{
   1.160 +	aspect = (float)x / (float)y;
   1.161 +	glViewport(0, 0, x, y);
   1.162 +
   1.163 +	glMatrixMode(GL_PROJECTION);
   1.164 +	glLoadIdentity();
   1.165 +	glScalef(1.0 / aspect, 1.0, 1.0);
   1.166 +}
   1.167 +
   1.168 +int handle_event(XEvent *ev)
   1.169 +{
   1.170 +	switch(ev->type) {
   1.171 +	case MapNotify:
   1.172 +	case UnmapNotify:
   1.173 +		mapped = ev->type == MapNotify ? 1 : 0;
   1.174 +		break;
   1.175 +
   1.176 +	case Expose:
   1.177 +		if(mapped && ev->xexpose.count == 0) {
   1.178 +			redraw();
   1.179 +		}
   1.180 +		break;
   1.181 +
   1.182 +	case KeyPress:
   1.183 +		{
   1.184 +			KeySym sym = XLookupKeysym(&ev->xkey, 0);
   1.185 +
   1.186 +			switch(sym) {
   1.187 +			case XK_Escape:
   1.188 +				return -1;
   1.189 +			}
   1.190 +		}
   1.191 +		break;
   1.192 +
   1.193 +	case ConfigureNotify:
   1.194 +		if(ev->xconfigure.width != width || ev->xconfigure.height != height) {
   1.195 +			width = ev->xconfigure.width;
   1.196 +			height = ev->xconfigure.height;
   1.197 +			reshape(width, height);
   1.198 +		}
   1.199 +		break;
   1.200 +
   1.201 +	case ClientMessage:
   1.202 +		if(ev->xclient.message_type == xa_wm_prot) {
   1.203 +			if(ev->xclient.data.l[0] == xa_wm_del_win) {
   1.204 +				return -1;
   1.205 +			}
   1.206 +		}
   1.207 +		break;
   1.208 +	}
   1.209 +	return 0;
   1.210 +}
   1.211 +
   1.212 +Window create_window(int xsz, int ysz)
   1.213 +{
   1.214 +	Window w, root;
   1.215 +	XVisualInfo *vis;
   1.216 +	XClassHint chint;
   1.217 +	XSetWindowAttributes xattr;
   1.218 +	unsigned int evmask, xattr_mask;
   1.219 +	int scr;
   1.220 +	int glxattr[] = {
   1.221 +		GLX_RGBA, GLX_DOUBLEBUFFER,
   1.222 +		GLX_RED_SIZE, 8,
   1.223 +		GLX_GREEN_SIZE, 8,
   1.224 +		GLX_BLUE_SIZE, 8,
   1.225 +		GLX_DEPTH_SIZE, 24,
   1.226 +		GLX_USE_GL, 1,
   1.227 +		None
   1.228 +	};
   1.229 +
   1.230 +	scr = DefaultScreen(dpy);
   1.231 +	root = RootWindow(dpy, scr);
   1.232 +
   1.233 +	if(!(vis = glXChooseVisual(dpy, scr, glxattr))) {
   1.234 +		printf("failed to find a suitable visual\n");
   1.235 +		return 0;
   1.236 +	}
   1.237 +	if(!(ctx = glXCreateContext(dpy, vis, 0, True))) {
   1.238 +		XFree(vis);
   1.239 +		return 0;
   1.240 +	}
   1.241 +
   1.242 +	xattr.background_pixel = xattr.border_pixel = BlackPixel(dpy, scr);
   1.243 +	xattr.colormap = XCreateColormap(dpy, root, vis->visual, AllocNone);
   1.244 +	xattr_mask = CWColormap | CWBackPixel | CWBorderPixel;
   1.245 +
   1.246 +	if(!(w = XCreateWindow(dpy, root, 0, 0, xsz, ysz, 0, vis->depth, InputOutput,
   1.247 +					vis->visual, xattr_mask, &xattr))) {
   1.248 +		printf("failed to create window\n");
   1.249 +		glXDestroyContext(dpy, ctx);
   1.250 +		XFree(vis);
   1.251 +		return 0;
   1.252 +	}
   1.253 +	XFree(vis);
   1.254 +
   1.255 +	evmask = StructureNotifyMask | VisibilityChangeMask | KeyPressMask |
   1.256 +		ExposureMask;
   1.257 +	XSelectInput(dpy, w, evmask);
   1.258 +
   1.259 +	XSetWMProtocols(dpy, w, &xa_wm_del_win, 1);
   1.260 +
   1.261 +	chint.res_name = chint.res_class = "xgetshape";
   1.262 +	XSetClassHint(dpy, w, &chint);
   1.263 +
   1.264 +	set_window_title(w, "GL xgetshape");
   1.265 +
   1.266 +	glXMakeCurrent(dpy, w, ctx);
   1.267 +	XMapWindow(dpy, w);
   1.268 +	return w;
   1.269 +}
   1.270 +
   1.271 +void set_window_title(Window win, const char *title)
   1.272 +{
   1.273 +	XTextProperty wm_name;
   1.274 +	XStringListToTextProperty((char**)&title, 1, &wm_name);
   1.275 +	XSetWMName(dpy, win, &wm_name);
   1.276 +	XSetWMIconName(dpy, win, &wm_name);
   1.277 +	XFree(wm_name.value);
   1.278 +}
   1.279 +
   1.280 +int get_window_shape(Window win, struct image *img)
   1.281 +{
   1.282 +	Bool buse, cuse;
   1.283 +	int bx, by, cx, cy;
   1.284 +	unsigned int bw, bh, cw, ch;
   1.285 +	int kind;
   1.286 +	int x, y, w, h;
   1.287 +	XRectangle *rects;
   1.288 +	int i, rect_count, rect_order;
   1.289 +
   1.290 +	XShapeQueryExtents(dpy, win, &buse, &bx, &by, &bw, &bh,
   1.291 +			&cuse, &cx, &cy, &bw, &bh);
   1.292 +	if(cuse) {
   1.293 +		x = cx;
   1.294 +		y = cy;
   1.295 +		w = cw;
   1.296 +		h = ch;
   1.297 +		kind = ShapeClip;
   1.298 +	} else if(buse) {
   1.299 +		x = bx;
   1.300 +		y = by;
   1.301 +		w = bw;
   1.302 +		h = bh;
   1.303 +		kind = ShapeBounding;
   1.304 +	} else {
   1.305 +		fprintf(stderr, "XShapeQueryExtents returned no extents\n");
   1.306 +		return -1;
   1.307 +	}
   1.308 +
   1.309 +	if(image_create(img, w, h) == -1) {
   1.310 +		fprintf(stderr, "failed to create shape image (%dx%d)\n", w, h);
   1.311 +		return -1;
   1.312 +	}
   1.313 +	image_clear(img, 0, 0, 0, 0);
   1.314 +
   1.315 +	if(!(rects = XShapeGetRectangles(dpy, win, kind, &rect_count, &rect_order))) {
   1.316 +		fprintf(stderr, "failed to get the shape rectangles\n");
   1.317 +		image_destroy(img);
   1.318 +		return -1;
   1.319 +	}
   1.320 +
   1.321 +	for(i=0; i<rect_count; i++) {
   1.322 +		image_fillrect(img, rects[i].x, rects[i].y, rects[i].width, rects[i].height,
   1.323 +				255, 255, 255, 255);
   1.324 +	}
   1.325 +	return 0;
   1.326 +}