--- /dev/null
+/* Test glGenProgramsNV(), glIsProgramNV(), glLoadProgramNV() */
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#define GL_GLEXT_PROTOTYPES
+#include <GL/glut.h>
+
+static const char *filename = NULL;
+static GLuint nr_steps = 4;
+
+static void usage( char *name )
+{
+ fprintf( stderr, "usage: %s [ options ] shader_filename\n", name );
+ fprintf( stderr, "\n" );
+ fprintf( stderr, "options:\n" );
+ fprintf( stderr, " -f flat shaded\n" );
+ fprintf( stderr, " -nNr subdivision steps\n" );
+}
+
+
+static void args(int argc, char *argv[])
+{
+ GLint i;
+
+ fprintf(stderr, "%d\n", argc);
+
+ for (i = 1; i < argc; i++) {
+ if (strncmp(argv[i], "-n", 2) == 0) {
+ nr_steps = atoi((argv[i]) + 2);
+ }
+ else if (strcmp(argv[i], "-f") == 0) {
+ glShadeModel(GL_FLAT);
+ }
+ 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);
+
+ glGenProgramsARB(1, &prognum);
+
+ glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
+ glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
+ sz, (const GLubyte *) buf);
+
+ assert(glIsProgramARB(prognum));
+ errno = glGetError();
+ printf("glGetError = %d\n", errno);
+ if (errno != GL_NO_ERROR)
+ {
+ GLint errorpos;
+
+ glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
+ printf("errorpos: %d\n", errorpos);
+ printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
+ }
+}
+
+
+union vert {
+ struct {
+ GLfloat color[3];
+ GLfloat pos[3];
+ } v;
+ GLfloat f[6];
+};
+
+static void make_midpoint( union vert *out,
+ const union vert *v0,
+ const union vert *v1)
+{
+ int i;
+ for (i = 0; i < 6; i++)
+ out->f[i] = v0->f[i] + .5 * (v1->f[i] - v0->f[i]);
+}
+
+static void subdiv( union vert *v0,
+ union vert *v1,
+ union vert *v2,
+ GLuint depth )
+{
+ if (depth == 0) {
+ glColor3fv(v0->v.color);
+ glVertex3fv(v0->v.pos);
+ glColor3fv(v1->v.color);
+ glVertex3fv(v1->v.pos);
+ glColor3fv(v2->v.color);
+ glVertex3fv(v2->v.pos);
+ }
+ else {
+ union vert m[3];
+
+ make_midpoint(&m[0], v0, v1);
+ make_midpoint(&m[1], v1, v2);
+ make_midpoint(&m[2], v2, v0);
+
+ subdiv(&m[0], &m[2], v0, depth-1);
+ subdiv(&m[1], &m[0], v1, depth-1);
+ subdiv(&m[2], &m[1], v2, depth-1);
+ subdiv(&m[0], &m[1], &m[2], depth-1);
+ }
+}
+
+/** Assignment */
+#define ASSIGN_3V( V, V0, V1, V2 ) \
+do { \
+ V[0] = V0; \
+ V[1] = V1; \
+ V[2] = V2; \
+} while(0)
+
+static void Display( void )
+{
+ glClearColor(0.3, 0.3, 0.3, 1);
+ glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+ glEnable(GL_VERTEX_PROGRAM_NV);
+
+ glBegin(GL_TRIANGLES);
+
+
+ {
+ union vert v[3];
+
+ ASSIGN_3V(v[0].v.color, 0,0,1);
+ ASSIGN_3V(v[0].v.pos, 0.9, -0.9, 0.0);
+ ASSIGN_3V(v[1].v.color, 0,1,0);
+ ASSIGN_3V(v[1].v.pos, 0.9, 0.9, 0.0);
+ ASSIGN_3V(v[2].v.color, 1,0,0);
+ ASSIGN_3V(v[2].v.pos, -0.9, 0, 0.0);
+
+ subdiv(&v[0], &v[1], &v[2], nr_steps);
+ }
+
+ glEnd();
+
+
+ glFlush();
+}
+
+
+static void Reshape( int width, int height )
+{
+ glViewport( 0, 0, width, height );
+ glMatrixMode( GL_PROJECTION );
+ glLoadIdentity();
+ glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
+ glMatrixMode( GL_MODELVIEW );
+ glLoadIdentity();
+ /*glTranslatef( 0.0, 0.0, -15.0 );*/
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+ (void) x;
+ (void) y;
+ switch (key) {
+ case 27:
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+
+
+int main( int argc, char *argv[] )
+{
+ glutInit( &argc, argv );
+ glutInitWindowPosition( 0, 0 );
+ glutInitWindowSize( 250, 250 );
+ glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH );
+ glutCreateWindow(argv[0]);
+ glutReshapeFunc( Reshape );
+ glutKeyboardFunc( Key );
+ glutDisplayFunc( Display );
+ args( argc, argv );
+ Init();
+ glutMainLoop();
+ return 0;
+}
projects / mesa.git / commitdiff