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GLX_EXT_texture_from_pixmap test

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Brian
2007-05-19 08:28:41 -06:00
parent 7ace7cfba4
commit 4465377ca3
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progs/xdemos/texture_from_pixmap.c Normal file
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/*
* Mesa 3-D graphics library
* Version: 7.1
*
* Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* Test the GLX_EXT_texture_from_pixmap extension
* Brian Paul
* 19 May 2007
*/
#define GL_GLEXT_PROTOTYPES
#define GLX_GLXEXT_PROTOTYPES
#include <GL/gl.h>
#include <GL/glx.h>
#include <X11/keysym.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static Display *
OpenDisplay(void)
{
int screen;
Display *dpy;
const char *ext;
dpy = XOpenDisplay(NULL);
if (!dpy) {
printf("Couldn't open default display!\n");
exit(1);
}
screen = DefaultScreen(dpy);
ext = glXQueryExtensionsString(dpy, screen);
if (!strstr(ext, "GLX_EXT_texture_from_pixmap")) {
printf("GLX_EXT_texture_from_pixmap not supported by GLX\n");
exit(1);
}
return dpy;
}
static GLXFBConfig
ChoosePixmapFBConfig(Display *display)
{
int screen = DefaultScreen(display);
GLXFBConfig *fbconfigs;
int i, nfbconfigs, value;
float top, bottom;
fbconfigs = glXGetFBConfigs(display, screen, &nfbconfigs);
for (i = 0; i < nfbconfigs; i++) {
glXGetFBConfigAttrib(display, fbconfigs[i], GLX_DRAWABLE_TYPE, &value);
if (!(value & GLX_PIXMAP_BIT))
continue;
glXGetFBConfigAttrib(display, fbconfigs[i],
GLX_BIND_TO_TEXTURE_TARGETS_EXT, &value);
if (!(value & GLX_TEXTURE_2D_BIT_EXT))
continue;
glXGetFBConfigAttrib(display, fbconfigs[i],
GLX_BIND_TO_TEXTURE_RGBA_EXT, &value);
if (value == False) {
glXGetFBConfigAttrib(display, fbconfigs[i],
GLX_BIND_TO_TEXTURE_RGB_EXT, &value);
if (value == False)
continue;
}
glXGetFBConfigAttrib(display, fbconfigs[i],
GLX_Y_INVERTED_EXT, &value);
if (value == True) {
top = 0.0f;
bottom = 1.0f;
}
else {
top = 1.0f;
bottom = 0.0f;
}
break;
}
if (i == nfbconfigs) {
printf("Unable to find FBconfig for texturing\n");
exit(1);
}
return fbconfigs[i];
}
static GLXPixmap
CreatePixmap(Display *dpy, GLXFBConfig config, int w, int h, Pixmap *p)
{
GLXPixmap gp;
const int pixmapAttribs[] = {
GLX_TEXTURE_TARGET_EXT, GLX_TEXTURE_2D_EXT,
GLX_TEXTURE_FORMAT_EXT, GLX_TEXTURE_FORMAT_RGB_EXT,
None
};
Window root = RootWindow(dpy, 0);
*p = XCreatePixmap(dpy, root, w, h, 24);
XSync(dpy, 0);
gp = glXCreatePixmap(dpy, config, *p, pixmapAttribs);
XSync(dpy, 0);
return gp;
}
static void
DrawPixmapImage(Display *dpy, Pixmap pm, int w, int h)
{
XGCValues gcvals;
GC gc;
gcvals.background = 0;
gc = XCreateGC(dpy, pm, GCBackground, &gcvals);
XSetForeground(dpy, gc, 0x0);
XFillRectangle(dpy, pm, gc, 0, 0, w, h);
XSetForeground(dpy, gc, 0xff0000);
XFillRectangle(dpy, pm, gc, 0, 0, 50, 50);
XSetForeground(dpy, gc, 0x00ff00);
XFillRectangle(dpy, pm, gc, w - 50, 0, 50, 50);
XSetForeground(dpy, gc, 0x0000ff);
XFillRectangle(dpy, pm, gc, 0, h - 50, 50, 50);
XSetForeground(dpy, gc, 0xffffff);
XFillRectangle(dpy, pm, gc, h - 50, h - 50, 50, 50);
XSetForeground(dpy, gc, 0xffff00);
XSetLineAttributes(dpy, gc, 3, LineSolid, CapButt, JoinBevel);
XDrawLine(dpy, pm, gc, 0, 0, w, h);
XDrawLine(dpy, pm, gc, 0, h, w, 0);
XFreeGC(dpy, gc);
}
static XVisualInfo *
ChooseWindowVisual(Display *dpy)
{
int screen = DefaultScreen(dpy);
XVisualInfo *visinfo;
int attribs[] = {
GLX_RGBA,
GLX_RED_SIZE, 1,
GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1,
GLX_DOUBLEBUFFER,
None
};
visinfo = glXChooseVisual(dpy, screen, attribs);
if (!visinfo) {
printf("Unable to find RGB, double-buffered visual\n");
exit(1);
}
return visinfo;
}
static Window
CreateWindow(Display *dpy, XVisualInfo *visinfo,
int width, int height, const char *name)
{
int screen = DefaultScreen(dpy);
Window win;
XSetWindowAttributes attr;
unsigned long mask;
Window root;
root = RootWindow(dpy, screen);
/* window attributes */
attr.background_pixel = 0;
attr.border_pixel = 0;
attr.colormap = XCreateColormap(dpy, root, visinfo->visual, AllocNone);
attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
win = XCreateWindow(dpy, root, 0, 0, width, height,
0, visinfo->depth, InputOutput,
visinfo->visual, mask, &attr);
if (win) {
XSizeHints sizehints;
sizehints.width = width;
sizehints.height = height;
sizehints.flags = USSize;
XSetNormalHints(dpy, win, &sizehints);
XSetStandardProperties(dpy, win, name, name,
None, (char **)NULL, 0, &sizehints);
XMapWindow(dpy, win);
}
return win;
}
static void
BindPixmapTexture(Display *dpy, GLXPixmap gp)
{
GLuint texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glXBindTexImageEXT(dpy, gp, GLX_FRONT_LEFT_EXT, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glEnable(GL_TEXTURE_2D);
/*
glXReleaseTexImageEXT (display, glxpixmap, GLX_FRONT_LEFT_EXT);
*/
}
static void
Resize(Window win, unsigned int width, unsigned int height)
{
float sz = 1.5;
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-sz, sz, -sz, sz, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
}
static void
Redraw(Display *dpy, Window win, float rot)
{
glClearColor(0.25, 0.25, 0.25, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glRotatef(rot, 0, 0, 1);
glRotatef(2.0 * rot, 1, 0, 0);
glBegin(GL_QUADS);
glTexCoord2d(0.0, 0.0);
glVertex2f(-1, -1);
glTexCoord2d(1.0, 0.0);
glVertex2f( 1, -1);
glTexCoord2d(1.0, 1.0);
glVertex2d(1.0, 1.0);
glTexCoord2d(0.0, 1.0);
glVertex2f(-1.0, 1.0);
glEnd();
glPopMatrix();
glXSwapBuffers(dpy, win);
}
static void
EventLoop(Display *dpy, Window win)
{
GLfloat rot = 0.0;
int anim = 0;
while (1) {
if (!anim || XPending(dpy) > 0) {
XEvent event;
XNextEvent(dpy, &event);
switch (event.type) {
case Expose:
Redraw(dpy, win, rot);
break;
case ConfigureNotify:
Resize(event.xany.window,
event.xconfigure.width,
event.xconfigure.height);
break;
case KeyPress:
{
char buf[100];
KeySym keySym;
XComposeStatus stat;
XLookupString(&event.xkey, buf, sizeof(buf), &keySym, &stat);
if (keySym == XK_Escape) {
return; /* exit */
}
else if (keySym == XK_r) {
rot += 1.0;
Redraw(dpy, win, rot);
}
else if (keySym == XK_a) {
anim = !anim;
}
else if (keySym == XK_R) {
rot -= 1.0;
Redraw(dpy, win, rot);
}
}
break;
default:
; /*no-op*/
}
}
else {
/* animate */
rot += 1.0;
Redraw(dpy, win, rot);
}
}
}
int
main(int argc, char *argv[])
{
Display *dpy;
GLXFBConfig pixmapConfig;
XVisualInfo *windowVis;
GLXPixmap gp;
Window win;
GLXContext ctx;
Pixmap p;
dpy = OpenDisplay();
pixmapConfig = ChoosePixmapFBConfig(dpy);
windowVis = ChooseWindowVisual(dpy);
win = CreateWindow(dpy, windowVis, 500, 500, "Texture From Pixmap");
gp = CreatePixmap(dpy, pixmapConfig, 512, 512, &p);
DrawPixmapImage(dpy, p, 512, 512);
ctx = glXCreateContext(dpy, windowVis, NULL, True);
if (!ctx) {
printf("Couldn't create GLX context\n");
exit(1);
}
glXMakeCurrent(dpy, win, ctx);
BindPixmapTexture(dpy, gp);
EventLoop(dpy, win);
return 0;
}