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-rw-r--r--progs/fp/fp-tri.c171
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;
+}