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authorBrian Paul <brian.paul@tungstengraphics.com>2001-12-15 22:33:59 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2001-12-15 22:33:59 +0000
commit9cb3947c56f7415b9172f3cdd27ea82cbcc762a6 (patch)
tree2ebdd3f73920d69327f56c9147bd5b08e0bcd50a /progs
parente3a0f3982421aa8773735e9727b12bba8af6610a (diff)
rotating, lit torus via vertex program
Diffstat (limited to 'progs')
-rw-r--r--progs/tests/vptorus.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/progs/tests/vptorus.c b/progs/tests/vptorus.c
new file mode 100644
index 0000000000..764dea4ec2
--- /dev/null
+++ b/progs/tests/vptorus.c
@@ -0,0 +1,174 @@
+/*
+ * A lit, rotating torus via vertex program
+ */
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#define GL_GLEXT_PROTOTYPES
+#include <GL/glut.h>
+
+static float Xrot = 0.0, Yrot = 0.0, Zrot = 0.0;
+static GLboolean Anim = GL_TRUE;
+
+
+static void Idle( void )
+{
+ Xrot += .3;
+ Yrot += .4;
+ Zrot += .2;
+ glutPostRedisplay();
+}
+
+
+static void Display( void )
+{
+ glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+ glPushMatrix();
+ glRotatef(Xrot, 1, 0, 0);
+ glRotatef(Yrot, 0, 1, 0);
+ glRotatef(Zrot, 0, 0, 1);
+ glutSolidTorus(0.75, 2.0, 10, 20);
+ glPopMatrix();
+
+ glutSwapBuffers();
+}
+
+
+static void Reshape( int width, int height )
+{
+ glViewport( 0, 0, width, height );
+ glMatrixMode( GL_PROJECTION );
+ glLoadIdentity();
+ glFrustum( -2.0, 2.0, -2.0, 2.0, 5.0, 25.0 );
+ glMatrixMode( GL_MODELVIEW );
+ glLoadIdentity();
+ glTranslatef( 0.0, 0.0, -12.0 );
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+ (void) x;
+ (void) y;
+ switch (key) {
+ case ' ':
+ Xrot = Yrot = Zrot = 0;
+ break;
+ case 'a':
+ Anim = !Anim;
+ if (Anim)
+ glutIdleFunc(Idle);
+ else
+ glutIdleFunc(NULL);
+ break;
+ case 'z':
+ Zrot -= 5.0;
+ break;
+ case 'Z':
+ Zrot += 5.0;
+ break;
+ case 27:
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void SpecialKey( int key, int x, int y )
+{
+ const GLfloat step = 3.0;
+ (void) x;
+ (void) y;
+ switch (key) {
+ case GLUT_KEY_UP:
+ Xrot -= step;
+ break;
+ case GLUT_KEY_DOWN:
+ Xrot += step;
+ break;
+ case GLUT_KEY_LEFT:
+ Yrot -= step;
+ break;
+ case GLUT_KEY_RIGHT:
+ Yrot += step;
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void Init( void )
+{
+ /* borrowed from an nvidia demo:
+ * c[0..3] = modelview matrix
+ * c[4..7] = inverse modelview matrix
+ * c[32] = light pos
+ * c[35] = diffuse color
+ */
+ static const char prog[] =
+ "!!VP1.0\n"
+ "#Simple transform and diffuse lighting\n"
+ "\n"
+ "DP4 o[HPOS].x, c[0], v[OPOS] ; # object x MVP -> clip\n"
+ "DP4 o[HPOS].y, c[1], v[OPOS] ;\n"
+ "DP4 o[HPOS].z, c[2], v[OPOS] ;\n"
+ "DP4 o[HPOS].w, c[3], v[OPOS] ;\n"
+
+ "DP3 R1.x, c[4], v[NRML] ; # normal x MV-1T -> lighting normal\n"
+ "DP3 R1.y, c[5], v[NRML] ;\n"
+ "DP3 R1.z, c[6], v[NRML] ;\n"
+
+ "DP3 R0, c[32], R1 ; # L.N\n"
+ "MUL o[COL0].xyz, R0, c[35] ; # col = L.N * diffuse\n"
+ "MOV o[TEX0], v[TEX0];\n"
+ "END";
+
+ if (!glutExtensionSupported("GL_NV_vertex_program")) {
+ printf("Sorry, this program requires GL_NV_vertex_program");
+ exit(1);
+ }
+
+ glLoadProgramNV(GL_VERTEX_PROGRAM_NV, 1,
+ strlen(prog), (const GLubyte *) prog);
+ assert(glIsProgramNV(1));
+ glBindProgramNV(GL_VERTEX_PROGRAM_NV, 1);
+
+ /* Load the program registers */
+ glTrackMatrixNV(GL_VERTEX_PROGRAM_NV, 0, GL_MODELVIEW_PROJECTION_NV, GL_IDENTITY_NV);
+ glTrackMatrixNV(GL_VERTEX_PROGRAM_NV, 4, GL_MODELVIEW, GL_INVERSE_TRANSPOSE_NV);
+
+ /* Light position */
+ glProgramParameter4fNV(GL_VERTEX_PROGRAM_NV, 32, 2, 2, 4, 1);
+ /* Diffuse material color */
+ glProgramParameter4fNV(GL_VERTEX_PROGRAM_NV, 35, 0.25, 0, 0.25, 1);
+
+ glEnable(GL_VERTEX_PROGRAM_NV);
+ glEnable(GL_DEPTH_TEST);
+ glClearColor(0.3, 0.3, 0.3, 1);
+
+ printf("glGetError = %d\n", (int) glGetError());
+}
+
+
+int main( int argc, char *argv[] )
+{
+ glutInit( &argc, argv );
+ glutInitWindowPosition( 0, 0 );
+ glutInitWindowSize( 250, 250 );
+ glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
+ glutCreateWindow(argv[0]);
+ glutReshapeFunc( Reshape );
+ glutKeyboardFunc( Key );
+ glutSpecialFunc( SpecialKey );
+ glutDisplayFunc( Display );
+ if (Anim)
+ glutIdleFunc(Idle);
+ Init();
+ glutMainLoop();
+ return 0;
+}