progs/es: OpenGL ES 1.x and 2.X demo programs.

The demo programs are written by Brian Paul, and cherry-picked from
opengl-es branch.  Several minor issues such as a linking problem are
fixed.

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>

2 files changed, 565 insertions, 0 deletions

diff --git a/progs/es2/xegl/Makefile b/progs/es2/xegl/Makefile
new file mode 100644
index 0000000000..88bb0127f8
--- /dev/null
+++ b/progs/es2/xegl/Makefile
@@ -0,0 +1,51 @@
+# progs/es2/xegl/Makefile
+
+TOP = ../../..
+include $(TOP)/configs/current
+
+
+INCLUDE_DIRS = \
+	-I$(TOP)/include \
+
+HEADERS = $(TOP)/include/GLES/egl.h
+
+
+ES2_LIB_DEPS = \
+	$(TOP)/$(LIB_DIR)/libEGL.so \
+	$(TOP)/$(LIB_DIR)/libGLESv2.so
+
+
+ES2_LIBS = \
+	-L$(TOP)/$(LIB_DIR) -lEGL \
+	-L$(TOP)/$(LIB_DIR) -lGLESv2 $(LIBDRM_LIB) -lX11
+
+PROGRAMS = \
+	es2_info \
+	tri
+
+
+.c.o:
+	$(CC) -c $(INCLUDE_DIRS) $(CFLAGS) $< -o $@
+
+
+
+default: $(PROGRAMS)
+
+
+
+es2_info.c:
+	cp ../../es1/xegl/es1_info.c es2_info.c
+
+es2_info: es2_info.o $(ES2_LIB_DEPS)
+	$(CC) $(CFLAGS) es2_info.o $(ES2_LIBS) -o $@
+
+tri: tri.o $(ES2_LIB_DEPS)
+	$(CC) $(CFLAGS) tri.o $(ES2_LIBS) -o $@
+
+
+
+clean:
+	rm -f *.o *~
+	rm -f $(PROGRAMS)
+	rm -f es2_info.c
+
diff --git a/progs/es2/xegl/tri.c b/progs/es2/xegl/tri.c
new file mode 100644
index 0000000000..eb52b10620
--- /dev/null
+++ b/progs/es2/xegl/tri.c
@@ -0,0 +1,514 @@
+/**************************************************************************
+ * 
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * All Rights Reserved.
+ *
+ **************************************************************************/
+
+/*
+ * Draw a triangle with X/EGL and OpenGL ES 2.x
+ */
+
+#define USE_FULL_GL 0
+
+
+
+#include <assert.h>
+#include <math.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/keysym.h>
+#if USE_FULL_GL
+#include <GL/gl.h>  /* use full OpenGL */
+#else
+#include <GLES2/gl2.h>  /* use OpenGL ES 2.x */
+#endif
+#include <EGL/egl.h>
+
+
+#define FLOAT_TO_FIXED(X)   ((X) * 65535.0)
+
+
+
+static GLfloat view_rotx = 0.0, view_roty = 0.0;
+
+static GLint u_matrix = -1;
+static GLint attr_pos = 0, attr_color = 1;
+
+
+static void
+make_z_rot_matrix(GLfloat angle, GLfloat *m)
+{
+   float c = cos(angle * M_PI / 180.0);
+   float s = sin(angle * M_PI / 180.0);
+   int i;
+   for (i = 0; i < 16; i++)
+      m[i] = 0.0;
+   m[0] = m[5] = m[10] = m[15] = 1.0;
+
+   m[0] = c;
+   m[1] = s;
+   m[4] = -s;
+   m[5] = c;
+}
+
+static void
+make_scale_matrix(GLfloat xs, GLfloat ys, GLfloat zs, GLfloat *m)
+{
+   int i;
+   for (i = 0; i < 16; i++)
+      m[i] = 0.0;
+   m[0] = xs;
+   m[5] = ys;
+   m[10] = zs;
+   m[15] = 1.0;
+}
+
+
+static void
+mul_matrix(GLfloat *prod, const GLfloat *a, const GLfloat *b)
+{
+#define A(row,col)  a[(col<<2)+row]
+#define B(row,col)  b[(col<<2)+row]
+#define P(row,col)  p[(col<<2)+row]
+   GLfloat p[16];
+   GLint i;
+   for (i = 0; i < 4; i++) {
+      const GLfloat ai0=A(i,0),  ai1=A(i,1),  ai2=A(i,2),  ai3=A(i,3);
+      P(i,0) = ai0 * B(0,0) + ai1 * B(1,0) + ai2 * B(2,0) + ai3 * B(3,0);
+      P(i,1) = ai0 * B(0,1) + ai1 * B(1,1) + ai2 * B(2,1) + ai3 * B(3,1);
+      P(i,2) = ai0 * B(0,2) + ai1 * B(1,2) + ai2 * B(2,2) + ai3 * B(3,2);
+      P(i,3) = ai0 * B(0,3) + ai1 * B(1,3) + ai2 * B(2,3) + ai3 * B(3,3);
+   }
+   memcpy(prod, p, sizeof(p));
+#undef A
+#undef B
+#undef PROD
+}
+
+
+static void
+draw(void)
+{
+   static const GLfloat verts[3][2] = {
+      { -1, -1 },
+      {  1, -1 },
+      {  0,  1 }
+   };
+   static const GLfloat colors[3][3] = {
+      { 1, 0, 0 },
+      { 0, 1, 0 },
+      { 0, 0, 1 }
+   };
+   GLfloat mat[16], rot[16], scale[16];
+
+   /* Set modelview/projection matrix */
+   make_z_rot_matrix(view_rotx, rot);
+   make_scale_matrix(0.5, 0.5, 0.5, scale);
+   mul_matrix(mat, rot, scale);
+   glUniformMatrix4fv(u_matrix, 1, GL_FALSE, mat);
+
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   {
+      glVertexAttribPointer(attr_pos, 2, GL_FLOAT, GL_FALSE, 0, verts);
+      glVertexAttribPointer(attr_color, 3, GL_FLOAT, GL_FALSE, 0, colors);
+      glEnableVertexAttribArray(attr_pos);
+      glEnableVertexAttribArray(attr_color);
+
+      glDrawArrays(GL_TRIANGLES, 0, 3);
+
+      glDisableVertexAttribArray(attr_pos);
+      glDisableVertexAttribArray(attr_color);
+   }
+}
+
+
+/* new window size or exposure */
+static void
+reshape(int width, int height)
+{
+   glViewport(0, 0, (GLint) width, (GLint) height);
+}
+
+
+static void
+create_shaders(void)
+{
+   static const char *fragShaderText =
+      "varying vec4 v_color;\n"
+      "void main() {\n"
+      "   gl_FragColor = v_color;\n"
+      "}\n";
+   static const char *vertShaderText =
+      "uniform mat4 modelviewProjection;\n"
+      "attribute vec4 pos;\n"
+      "attribute vec4 color;\n"
+      "varying vec4 v_color;\n"
+      "void main() {\n"
+      "   gl_Position = modelviewProjection * pos;\n"
+      "   v_color = color;\n"
+      "}\n";
+
+   GLuint fragShader, vertShader, program;
+   GLint stat;
+
+   fragShader = glCreateShader(GL_FRAGMENT_SHADER);
+   glShaderSource(fragShader, 1, (const char **) &fragShaderText, NULL);
+   glCompileShader(fragShader);
+   glGetShaderiv(fragShader, GL_COMPILE_STATUS, &stat);
+   if (!stat) {
+      printf("Error: fragment shader did not compile!\n");
+      exit(1);
+   }
+
+   vertShader = glCreateShader(GL_VERTEX_SHADER);
+   glShaderSource(vertShader, 1, (const char **) &vertShaderText, NULL);
+   glCompileShader(vertShader);
+   glGetShaderiv(vertShader, GL_COMPILE_STATUS, &stat);
+   if (!stat) {
+      printf("Error: vertex shader did not compile!\n");
+      exit(1);
+   }
+
+   program = glCreateProgram();
+   glAttachShader(program, fragShader);
+   glAttachShader(program, vertShader);
+   glLinkProgram(program);
+
+   glGetProgramiv(program, GL_LINK_STATUS, &stat);
+   if (!stat) {
+      char log[1000];
+      GLsizei len;
+      glGetProgramInfoLog(program, 1000, &len, log);
+      printf("Error: linking:\n%s\n", log);
+      exit(1);
+   }
+
+   glUseProgram(program);
+
+   if (1) {
+      /* test setting attrib locations */
+      glBindAttribLocation(program, attr_pos, "pos");
+      glBindAttribLocation(program, attr_color, "color");
+      glLinkProgram(program);  /* needed to put attribs into effect */
+   }
+   else {
+      /* test automatic attrib locations */
+      attr_pos = glGetAttribLocation(program, "pos");
+      attr_color = glGetAttribLocation(program, "color");
+   }
+
+   u_matrix = glGetUniformLocation(program, "modelviewProjection");
+   printf("Uniform modelviewProjection at %d\n", u_matrix);
+   printf("Attrib pos at %d\n", attr_pos);
+   printf("Attrib color at %d\n", attr_color);
+}
+
+
+static void
+init(void)
+{
+   typedef void (*proc)();
+
+#if 1 /* test code */
+   proc p = eglGetProcAddress("glMapBufferOES");
+   assert(p);
+#endif
+
+   glClearColor(0.4, 0.4, 0.4, 0.0);
+
+   create_shaders();
+}
+
+
+/*
+ * Create an RGB, double-buffered X window.
+ * Return the window and context handles.
+ */
+static void
+make_x_window(Display *x_dpy, EGLDisplay egl_dpy,
+              const char *name,
+              int x, int y, int width, int height,
+              Window *winRet,
+              EGLContext *ctxRet,
+              EGLSurface *surfRet)
+{
+   static const EGLint attribs[] = {
+      EGL_RED_SIZE, 1,
+      EGL_GREEN_SIZE, 1,
+      EGL_BLUE_SIZE, 1,
+      EGL_DEPTH_SIZE, 1,
+      EGL_NONE
+   };
+   static const EGLint ctx_attribs[] = {
+      EGL_CONTEXT_CLIENT_VERSION, 2,
+      EGL_NONE
+   };
+   int scrnum;
+   XSetWindowAttributes attr;
+   unsigned long mask;
+   Window root;
+   Window win;
+   XVisualInfo *visInfo, visTemplate;
+   int num_visuals;
+   EGLContext ctx;
+   EGLConfig config;
+   EGLint num_configs;
+   EGLint vid;
+
+   scrnum = DefaultScreen( x_dpy );
+   root = RootWindow( x_dpy, scrnum );
+
+   if (!eglChooseConfig( egl_dpy, attribs, &config, 1, &num_configs)) {
+      printf("Error: couldn't get an EGL visual config\n");
+      exit(1);
+   }
+
+   assert(config);
+   assert(num_configs > 0);
+
+   if (!eglGetConfigAttrib(egl_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;
+   mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
+
+   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);
+   }
+
+#if USE_FULL_GL /* XXX fix this when eglBindAPI() works */
+   eglBindAPI(EGL_OPENGL_API);
+#else
+   eglBindAPI(EGL_OPENGL_ES_API);
+#endif
+
+   ctx = eglCreateContext(egl_dpy, config, EGL_NO_CONTEXT, ctx_attribs );
+   if (!ctx) {
+      printf("Error: eglCreateContext failed\n");
+      exit(1);
+   }
+
+   /* test eglQueryContext() */
+   {
+      EGLint val;
+      eglQueryContext(egl_dpy, ctx, EGL_CONTEXT_CLIENT_VERSION, &val);
+      assert(val == 2);
+   }
+
+   *surfRet = eglCreateWindowSurface(egl_dpy, config, win, NULL);
+   if (!*surfRet) {
+      printf("Error: eglCreateWindowSurface failed\n");
+      exit(1);
+   }
+
+   {
+      EGLint val;
+      eglQuerySurface(egl_dpy, *surfRet, EGL_WIDTH, &val);
+      assert(val == width);
+      eglQuerySurface(egl_dpy, *surfRet, EGL_HEIGHT, &val);
+      assert(val == height);
+      eglQuerySurface(egl_dpy, *surfRet, EGL_SURFACE_TYPE, &val);
+      assert(val == EGL_WINDOW_BIT);
+   }
+
+   XFree(visInfo);
+
+   *winRet = win;
+   *ctxRet = ctx;
+}
+
+
+static void
+event_loop(Display *dpy, Window win,
+           EGLDisplay egl_dpy, EGLSurface egl_surf)
+{
+   while (1) {
+      int redraw = 0;
+      XEvent event;
+
+      XNextEvent(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 {
+               r = XLookupString(&event.xkey, buffer, sizeof(buffer),
+                                 NULL, NULL);
+               if (buffer[0] == 27) {
+                  /* escape */
+                  return;
+               }
+            }
+         }
+         redraw = 1;
+         break;
+      default:
+         ; /*no-op*/
+      }
+
+      if (redraw) {
+         draw();
+         eglSwapBuffers(egl_dpy, egl_surf);
+      }
+   }
+}
+
+
+static void
+usage(void)
+{
+   printf("Usage:\n");
+   printf("  -display <displayname>  set the display to run on\n");
+   printf("  -info                   display OpenGL renderer info\n");
+}
+ 
+
+int
+main(int argc, char *argv[])
+{
+   const int winWidth = 300, winHeight = 300;
+   Display *x_dpy;
+   Window win;
+   EGLSurface egl_surf;
+   EGLContext egl_ctx;
+   EGLDisplay egl_dpy;
+   char *dpyName = NULL;
+   GLboolean printInfo = GL_FALSE;
+   EGLint egl_major, egl_minor;
+   int i;
+   const char *s;
+
+   for (i = 1; i < argc; i++) {
+      if (strcmp(argv[i], "-display") == 0) {
+         dpyName = argv[i+1];
+         i++;
+      }
+      else if (strcmp(argv[i], "-info") == 0) {
+         printInfo = GL_TRUE;
+      }
+      else {
+         usage();
+         return -1;
+      }
+   }
+
+   x_dpy = XOpenDisplay(dpyName);
+   if (!x_dpy) {
+      printf("Error: couldn't open display %s\n",
+	     dpyName ? dpyName : getenv("DISPLAY"));
+      return -1;
+   }
+
+   egl_dpy = eglGetDisplay(x_dpy);
+   if (!egl_dpy) {
+      printf("Error: eglGetDisplay() failed\n");
+      return -1;
+   }
+
+   if (!eglInitialize(egl_dpy, &egl_major, &egl_minor)) {
+      printf("Error: eglInitialize() failed\n");
+      return -1;
+   }
+
+   s = eglQueryString(egl_dpy, EGL_VERSION);
+   printf("EGL_VERSION = %s\n", s);
+
+   s = eglQueryString(egl_dpy, EGL_VENDOR);
+   printf("EGL_VENDOR = %s\n", s);
+
+   s = eglQueryString(egl_dpy, EGL_EXTENSIONS);
+   printf("EGL_EXTENSIONS = %s\n", s);
+
+   s = eglQueryString(egl_dpy, EGL_CLIENT_APIS);
+   printf("EGL_CLIENT_APIS = %s\n", s);
+
+   make_x_window(x_dpy, egl_dpy,
+                 "OpenGL ES 2.x tri", 0, 0, winWidth, winHeight,
+                 &win, &egl_ctx, &egl_surf);
+
+   XMapWindow(x_dpy, win);
+   if (!eglMakeCurrent(egl_dpy, egl_surf, egl_surf, egl_ctx)) {
+      printf("Error: eglMakeCurrent() failed\n");
+      return -1;
+   }
+
+   if (printInfo) {
+      printf("GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
+      printf("GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
+      printf("GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
+      printf("GL_EXTENSIONS = %s\n", (char *) glGetString(GL_EXTENSIONS));
+   }
+
+   init();
+
+   /* Set initial projection/viewing transformation.
+    * We can't be sure we'll get a ConfigureNotify event when the window
+    * first appears.
+    */
+   reshape(winWidth, winHeight);
+
+   event_loop(x_dpy, win, egl_dpy, egl_surf);
+
+   eglDestroyContext(egl_dpy, egl_ctx);
+   eglDestroySurface(egl_dpy, egl_surf);
+   eglTerminate(egl_dpy);
+
+
+   XDestroyWindow(x_dpy, win);
+   XCloseDisplay(x_dpy);
+
+   return 0;
+}