diff options
Diffstat (limited to 'progs/egl')
| -rw-r--r-- | progs/egl/xeglbindtex.c | 474 |
1 files changed, 474 insertions, 0 deletions
diff --git a/progs/egl/xeglbindtex.c b/progs/egl/xeglbindtex.c new file mode 100644 index 0000000000..fdd9fe2b87 --- /dev/null +++ b/progs/egl/xeglbindtex.c @@ -0,0 +1,474 @@ +/* + * Simple demo for eglBindTexImage. Based on xegl_tri.c by + * + * Copyright (C) 2008 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. + */ + +/* + * The spec says that eglBindTexImage supports only OpenGL ES context, but this + * demo uses OpenGL context. Keep in mind that this is non-standard. + */ + +#include <math.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <X11/Xlib.h> +#include <X11/Xutil.h> +#include <X11/keysym.h> +#include <GL/gl.h> +#include <EGL/egl.h> + +static EGLDisplay dpy; +static EGLContext ctx_win, ctx_pbuf; +static EGLSurface surf_win, surf_pbuf; +static GLuint tex_pbuf; + +static GLfloat view_rotx = 0.0, view_roty = 0.0, view_rotz = 0.0; +static GLboolean blend = GL_TRUE; +static GLuint color_flow; + +static void +make_pbuffer(int width, int height) +{ + static const EGLint config_attribs[] = { + EGL_RED_SIZE, 8, + EGL_GREEN_SIZE, 8, + EGL_BLUE_SIZE, 8, + EGL_BIND_TO_TEXTURE_RGB, EGL_TRUE, + EGL_NONE + }; + EGLint pbuf_attribs[] = { + EGL_WIDTH, width, + EGL_HEIGHT, height, + EGL_TEXTURE_FORMAT, EGL_TEXTURE_RGB, + EGL_TEXTURE_TARGET, EGL_TEXTURE_2D, + EGL_NONE + }; + EGLConfig config; + EGLint num_configs; + + if (!eglChooseConfig(dpy, config_attribs, &config, 1, &num_configs)) { + printf("Error: couldn't get an EGL visual config for pbuffer\n"); + exit(1); + } + + eglBindAPI(EGL_OPENGL_API); + ctx_pbuf = eglCreateContext(dpy, config, EGL_NO_CONTEXT, NULL ); + surf_pbuf = eglCreatePbufferSurface(dpy, config, pbuf_attribs); + if (surf_pbuf == EGL_NO_SURFACE) { + printf("failed to allocate pbuffer\n"); + exit(1); + } + + glGenTextures(1, &tex_pbuf); +} + +static void +use_pbuffer(void) +{ + static int initialized; + + eglMakeCurrent(dpy, surf_pbuf, surf_pbuf, ctx_pbuf); + if (!initialized) { + EGLint width, height; + GLfloat ar; + + initialized = 1; + + eglQuerySurface(dpy, surf_pbuf, EGL_WIDTH, &width); + eglQuerySurface(dpy, surf_pbuf, EGL_WIDTH, &height); + ar = (GLfloat) width / (GLfloat) height; + + glViewport(0, 0, (GLint) width, (GLint) height); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glFrustum(-ar, ar, -1, 1, 1.0, 10.0); + + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + + /* y-inverted */ + glScalef(1.0, -1.0, 1.0); + + glTranslatef(0.0, 0.0, -5.0); + + glClearColor(0.2, 0.2, 0.2, 0.0); + } +} + +static void +make_window(Display *x_dpy, const char *name, + int x, int y, int width, int height, + Window *winRet) +{ + static const EGLint attribs[] = { + EGL_RED_SIZE, 8, + EGL_GREEN_SIZE, 8, + EGL_BLUE_SIZE, 8, + EGL_ALPHA_SIZE, 8, + EGL_DEPTH_SIZE, 8, + EGL_NONE + }; + + int scrnum; + XSetWindowAttributes attr; + unsigned long mask; + Window root; + Window win; + XVisualInfo *visInfo, visTemplate; + int num_visuals; + EGLConfig config; + EGLint num_configs, vid; + + scrnum = DefaultScreen( x_dpy ); + root = RootWindow( x_dpy, scrnum ); + + if (!eglChooseConfig(dpy, attribs, &config, 1, &num_configs)) { + printf("Error: couldn't get an EGL visual config\n"); + exit(1); + } + + if (!eglGetConfigAttrib(dpy, config, EGL_NATIVE_VISUAL_ID, &vid)) { + printf("Error: eglGetConfigAttrib() failed\n"); + exit(1); + } + + /* The X window visual must match the EGL config */ + visTemplate.visualid = vid; + visInfo = XGetVisualInfo(x_dpy, VisualIDMask, &visTemplate, &num_visuals); + if (!visInfo) { + printf("Error: couldn't get X visual\n"); + exit(1); + } + + /* window attributes */ + attr.background_pixel = 0; + attr.border_pixel = 0; + attr.colormap = XCreateColormap( x_dpy, root, visInfo->visual, AllocNone); + attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask; + attr.override_redirect = 0; + mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask | CWOverrideRedirect; + + win = XCreateWindow( x_dpy, root, 0, 0, width, height, + 0, visInfo->depth, InputOutput, + visInfo->visual, mask, &attr ); + + /* set hints and properties */ + { + XSizeHints sizehints; + sizehints.x = x; + sizehints.y = y; + sizehints.width = width; + sizehints.height = height; + sizehints.flags = USSize | USPosition; + XSetNormalHints(x_dpy, win, &sizehints); + XSetStandardProperties(x_dpy, win, name, name, + None, (char **)NULL, 0, &sizehints); + } + + eglBindAPI(EGL_OPENGL_API); + ctx_win = eglCreateContext(dpy, config, EGL_NO_CONTEXT, NULL ); + if (!ctx_win) { + printf("Error: glXCreateContext failed\n"); + exit(1); + } + + surf_win = eglCreateWindowSurface(dpy, config, win, NULL); + + XFree(visInfo); + + *winRet = win; +} + +static void +use_window(void) +{ + static int initialized; + + eglMakeCurrent(dpy, surf_win, surf_win, ctx_win); + if (!initialized) { + initialized = 1; + glEnable(GL_TEXTURE_2D); + glBindTexture(GL_TEXTURE_2D, tex_pbuf); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + + glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + } +} + +static void +draw_triangle(void) +{ + static const GLfloat verts[3][2] = { + { -3, -3 }, + { 3, -3 }, + { 0, 3 } + }; + GLfloat colors[3][3] = { + { 1, 0, 0 }, + { 0, 1, 0 }, + { 0, 0, 1 } + }; + GLint i; + + /* flow the color */ + for (i = 0; i < 3; i++) { + GLint first = (i + color_flow / 256) % 3; + GLint second = (first + 1) % 3; + GLint third = (second + 1) % 3; + GLfloat c = (color_flow % 256) / 256.0f; + + c = c * c * c; + colors[i][first] = 1.0f - c; + colors[i][second] = c; + colors[i][third] = 0.0f; + } + + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + glVertexPointer(2, GL_FLOAT, 0, verts); + glColorPointer(3, GL_FLOAT, 0, colors); + glEnableClientState(GL_VERTEX_ARRAY); + glEnableClientState(GL_COLOR_ARRAY); + + glDrawArrays(GL_TRIANGLES, 0, 3); + + glDisableClientState(GL_VERTEX_ARRAY); + glDisableClientState(GL_COLOR_ARRAY); +} + +static void +draw_textured_cube(void) +{ + static const GLfloat verts[][2] = { + { -4, -4 }, + { 4, -4 }, + { 4, 4 }, + { -4, 4 } + }; + static const GLfloat colors[][4] = { + { 1, 1, 1, 0.5 }, + { 1, 1, 1, 0.5 }, + { 1, 1, 1, 0.5 }, + { 1, 1, 1, 0.5 } + }; + static const GLfloat texs[][2] = { + { 0, 0 }, + { 1, 0 }, + { 1, 1 }, + { 0, 1 } + }; + static const GLfloat xforms[6][4] = { + { 0, 0, 1, 0 }, + { 90, 0, 1, 0 }, + { 180, 0, 1, 0 }, + { 270, 0, 1, 0 }, + { 90, 1, 0, 0 }, + { -90, 1, 0, 0 } + }; + GLint i; + + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + + if (blend) { + glDisable(GL_DEPTH_TEST); + glEnable(GL_BLEND); + } else { + glEnable(GL_DEPTH_TEST); + glDisable(GL_BLEND); + } + + glVertexPointer(2, GL_FLOAT, 0, verts); + glColorPointer(4, GL_FLOAT, 0, colors); + glTexCoordPointer(2, GL_FLOAT, 0, texs); + + glEnableClientState(GL_VERTEX_ARRAY); + glEnableClientState(GL_COLOR_ARRAY); + glEnableClientState(GL_TEXTURE_COORD_ARRAY); + + for (i = 0; i < 6; i++) { + glPushMatrix(); + glRotatef(xforms[i][0], xforms[i][1], xforms[i][2], xforms[i][3]); + glTranslatef(0, 0, 4.1); + glDrawArrays(GL_TRIANGLE_FAN, 0, 4); + glPopMatrix(); + } + + glDisableClientState(GL_VERTEX_ARRAY); + glDisableClientState(GL_COLOR_ARRAY); + glDisableClientState(GL_TEXTURE_COORD_ARRAY); +} + +static void +draw(void) +{ + use_pbuffer(); + draw_triangle(); + + use_window(); + + eglBindTexImage(dpy, surf_pbuf, EGL_BACK_BUFFER); + + glPushMatrix(); + glRotatef(view_rotx, 1, 0, 0); + glRotatef(view_roty, 0, 1, 0); + glRotatef(view_rotz, 0, 0, 1); + + draw_textured_cube(); + + glPopMatrix(); + + eglReleaseTexImage(dpy, surf_pbuf, EGL_BACK_BUFFER); +} + +/* new window size or exposure */ +static void +reshape(int width, int height) +{ + GLfloat ar = (GLfloat) width / (GLfloat) height; + + use_window(); + + glViewport(0, 0, (GLint) width, (GLint) height); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glFrustum(-ar, ar, -1, 1, 5.0, 60.0); + + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + glTranslatef(0.0, 0.0, -40.0); +} + +static void +event_loop(Display *x_dpy, Window win) +{ + while (1) { + int redraw = 1; + + if (XPending(x_dpy) > 0) { + XEvent event; + XNextEvent(x_dpy, &event); + + switch (event.type) { + case Expose: + redraw = 1; + break; + case ConfigureNotify: + reshape(event.xconfigure.width, event.xconfigure.height); + break; + case KeyPress: + { + char buffer[10]; + int r, code; + code = XLookupKeysym(&event.xkey, 0); + if (code == XK_Left) { + view_roty += 5.0; + } + else if (code == XK_Right) { + view_roty -= 5.0; + } + else if (code == XK_Up) { + view_rotx += 5.0; + } + else if (code == XK_Down) { + view_rotx -= 5.0; + } + else if (code == XK_b) { + blend = !blend; + } + else { + r = XLookupString(&event.xkey, buffer, sizeof(buffer), + NULL, NULL); + if (buffer[0] == 27) { + /* escape */ + return; + } + } + } + redraw = 1; + break; + default: + ; /*no-op*/ + } + } + + if (redraw) { + view_rotx += 1.0; + view_roty += 2.0; + view_rotz += 1.5; + color_flow += 20; + draw(); + eglSwapBuffers(dpy, surf_win); + } + } +} + +int +main(int argc, char *argv[]) +{ + const int winWidth = 300, winHeight = 300; + Display *x_dpy; + Window win; + char *dpyName = NULL; + EGLint egl_major, egl_minor; + const char *s; + + x_dpy = XOpenDisplay(dpyName); + if (!x_dpy) { + printf("Error: couldn't open display %s\n", + dpyName ? dpyName : getenv("DISPLAY")); + return -1; + } + + dpy = eglGetDisplay(x_dpy); + if (!dpy) { + printf("Error: eglGetDisplay() failed\n"); + return -1; + } + + if (!eglInitialize(dpy, &egl_major, &egl_minor)) { + printf("Error: eglInitialize() failed\n"); + return -1; + } + + s = eglQueryString(dpy, EGL_VERSION); + printf("EGL_VERSION = %s\n", s); + + make_window(x_dpy, "color flow", 0, 0, winWidth, winHeight, &win); + make_pbuffer(winWidth, winHeight); + + XMapWindow(x_dpy, win); + + reshape(winWidth, winHeight); + event_loop(x_dpy, win); + + glDeleteTextures(1, &tex_pbuf); + + eglMakeCurrent(dpy, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); + eglTerminate(dpy); + + XDestroyWindow(x_dpy, win); + XCloseDisplay(x_dpy); + + return 0; +} |