1 files changed, 171 insertions, 0 deletions
diff --git a/progs/fp/fp-tri.c b/progs/fp/fp-tri.c
new file mode 100644
index 0000000000..843f897871
--- /dev/null
+++ b/progs/fp/fp-tri.c
@@ -0,0 +1,171 @@
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#define GL_GLEXT_PROTOTYPES
+#include <GL/glut.h>
+#include <unistd.h>
+#include <signal.h>
+
+unsigned show_fps = 0;
+unsigned int frame_cnt = 0;
+void alarmhandler(int);
+static const char *filename = NULL;
+
+static void usage(char *name)
+{
+   fprintf(stderr, "usage: %s [ options ] shader_filename\n", name);
+   fprintf(stderr, "\n" );
+   fprintf(stderr, "options:\n");
+   fprintf(stderr, "    -fps  show frames per second\n");
+}
+
+void alarmhandler (int sig)
+{
+   if (sig == SIGALRM) {
+      printf("%d frames in 5.0 seconds = %.3f FPS\n", frame_cnt,
+             frame_cnt / 5.0);
+
+      frame_cnt = 0;
+   }
+   signal(SIGALRM, alarmhandler);
+   alarm(5);
+}
+
+static void args(int argc, char *argv[])
+{
+   GLint i;
+
+   for (i = 1; i < argc; i++) {
+      if (strcmp(argv[i], "-fps") == 0) {
+         show_fps = 1;
+      }
+      else if (i == argc - 1) {
+	 filename = argv[i];
+      }
+      else {
+	 usage(argv[0]);
+	 exit(1);
+      }
+   }
+
+   if (!filename) {
+      usage(argv[0]);
+      exit(1);
+   }
+}
+
+static void Init( void )
+{
+   GLint errno;
+   GLuint prognum;
+   char buf[4096];
+   GLuint sz;
+   FILE *f;
+
+   if ((f = fopen(filename, "r")) == NULL) {
+      fprintf(stderr, "Couldn't open %s\n", filename);
+      exit(1);
+   }
+
+   sz = fread(buf, 1, sizeof(buf), f);
+   if (!feof(f)) {
+      fprintf(stderr, "file too long\n");
+      exit(1);
+   }
+   fprintf(stderr, "%.*s\n", sz, buf);
+
+   if (!glutExtensionSupported("GL_ARB_fragment_program")) {
+      printf("Error: GL_ARB_fragment_program not supported!\n");
+      exit(1);
+   }
+   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+
+   /* Setup the fragment program */
+   glGenProgramsARB(1, &prognum);
+   glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prognum);
+   glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
+                      sz, (const GLubyte *)buf);
+
+   errno = glGetError();
+   printf("glGetError = 0x%x\n", errno);
+   if (errno != GL_NO_ERROR) {
+      GLint errorpos;
+
+      glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
+      printf("errorpos: %d\n", errorpos);
+      printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
+             (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
+   }
+   glEnable(GL_FRAGMENT_PROGRAM_ARB);
+
+   glClearColor(.3, .3, .3, 0);
+}
+
+static void Reshape(int width, int height)
+{
+
+    glViewport(0, 0, (GLint)width, (GLint)height);
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
+    glMatrixMode(GL_MODELVIEW);
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+
+    switch (key) {
+      case 27:
+	exit(1);
+      default:
+	return;
+    }
+
+    glutPostRedisplay();
+}
+
+static void Display(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT);
+
+   glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 0, 1.0, 1.0, 0.0, 0.0);
+   glProgramLocalParameter4fARB(GL_FRAGMENT_PROGRAM_ARB, 1, 0.0, 0.0, 1.0, 1.0);
+   glBegin(GL_TRIANGLES);
+   glColor3f(0,0,1);
+   glVertex3f( 0.9, -0.9, -30.0);
+   glColor3f(1,0,0);
+   glVertex3f( 0.9,  0.9, -30.0);
+   glColor3f(0,1,0);
+   glVertex3f(-0.9,  0.0, -30.0);
+   glEnd();
+
+   glFlush();
+
+   if (show_fps) {
+      ++frame_cnt;
+      glutPostRedisplay();
+   }
+}
+
+
+int main(int argc, char **argv)
+{
+   glutInit(&argc, argv);
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(250, 250);
+   glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH);
+   args(argc, argv);
+   glutCreateWindow(filename);
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutDisplayFunc(Display);
+   Init();
+   if (show_fps) {
+      signal(SIGALRM, alarmhandler);
+      alarm(5);
+   }
+   glutMainLoop();
+   return 0;
+}