test program for NV_vertex_program + vertex arrays
This commit is contained in:
parent
bcc5d46b08
commit
62954c8c30
|
@ -0,0 +1,277 @@
|
|||
/*
|
||||
* Test vertex arrays with GL_NV_vertex_program
|
||||
*
|
||||
* Based on a stripped-down version of the isosurf demo.
|
||||
* The vertex program is trivial: compute the resulting
|
||||
* RGB color as a linear function of vertex XYZ.
|
||||
*/
|
||||
|
||||
#include <assert.h>
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <math.h>
|
||||
#define GL_GLEXT_PROTOTYPES
|
||||
#include "GL/glut.h"
|
||||
|
||||
#define MAXVERTS 10000
|
||||
static float data[MAXVERTS][6];
|
||||
static GLint numverts;
|
||||
|
||||
static GLfloat xrot;
|
||||
static GLfloat yrot;
|
||||
static GLboolean useArrays = GL_FALSE;
|
||||
static GLboolean useProgram = GL_FALSE;
|
||||
|
||||
|
||||
static void read_surface( char *filename )
|
||||
{
|
||||
FILE *f;
|
||||
|
||||
f = fopen(filename,"r");
|
||||
if (!f) {
|
||||
printf("couldn't read %s\n", filename);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
numverts = 0;
|
||||
while (!feof(f) && numverts < MAXVERTS) {
|
||||
fscanf( f, "%f %f %f %f %f %f",
|
||||
&data[numverts][0], &data[numverts][1], &data[numverts][2],
|
||||
&data[numverts][3], &data[numverts][4], &data[numverts][5] );
|
||||
numverts++;
|
||||
}
|
||||
numverts--;
|
||||
|
||||
printf("%d vertices, %d triangles\n", numverts, numverts-2);
|
||||
printf("data = %p\n", (void *) data);
|
||||
fclose(f);
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
static void Display(void)
|
||||
{
|
||||
if (useProgram)
|
||||
glEnable(GL_VERTEX_PROGRAM_NV);
|
||||
else
|
||||
glDisable(GL_VERTEX_PROGRAM_NV);
|
||||
|
||||
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
|
||||
|
||||
glPushMatrix();
|
||||
glRotatef(xrot, 1, 0, 0);
|
||||
glRotatef(yrot, 0, 1, 0);
|
||||
glScalef(2, 2, 2);
|
||||
if (useArrays) {
|
||||
if (useProgram) {
|
||||
glVertexAttribPointerNV( 0, 3, GL_FLOAT, 6 * sizeof(GLfloat), data );
|
||||
glEnableClientState( GL_VERTEX_ATTRIB_ARRAY0_NV );
|
||||
}
|
||||
else {
|
||||
glVertexPointer( 3, GL_FLOAT, 6 * sizeof(GLfloat), data );
|
||||
glEnableClientState( GL_VERTEX_ARRAY );
|
||||
}
|
||||
glNormalPointer( GL_FLOAT, 6 * sizeof(GLfloat), ((GLfloat *) data) + 3);
|
||||
glEnableClientState( GL_NORMAL_ARRAY );
|
||||
|
||||
glDrawArrays(GL_TRIANGLE_STRIP, 0, numverts);
|
||||
|
||||
glDisableClientState( GL_VERTEX_ATTRIB_ARRAY0_NV );
|
||||
glDisableClientState( GL_VERTEX_ARRAY );
|
||||
glDisableClientState( GL_NORMAL_ARRAY );
|
||||
}
|
||||
else {
|
||||
int i;
|
||||
glBegin(GL_TRIANGLE_STRIP);
|
||||
for (i = 0; i < numverts; i++) {
|
||||
glNormal3fv( data[i] + 3 );
|
||||
glVertex3fv( data[i] + 0 );
|
||||
}
|
||||
glEnd();
|
||||
}
|
||||
glPopMatrix();
|
||||
|
||||
if (glGetError())
|
||||
printf("Error!\n");
|
||||
|
||||
glutSwapBuffers();
|
||||
}
|
||||
|
||||
|
||||
static void InitMaterials(void)
|
||||
{
|
||||
static float ambient[] = {0.1, 0.1, 0.1, 1.0};
|
||||
static float diffuse[] = {0.5, 1.0, 1.0, 1.0};
|
||||
static float position0[] = {0.0, 0.0, 20.0, 0.0};
|
||||
static float position1[] = {0.0, 0.0, -20.0, 0.0};
|
||||
static float front_mat_shininess[] = {60.0};
|
||||
static float front_mat_specular[] = {0.2, 0.2, 0.2, 1.0};
|
||||
static float front_mat_diffuse[] = {0.5, 0.28, 0.38, 1.0};
|
||||
/*
|
||||
static float back_mat_shininess[] = {60.0};
|
||||
static float back_mat_specular[] = {0.5, 0.5, 0.2, 1.0};
|
||||
static float back_mat_diffuse[] = {1.0, 1.0, 0.2, 1.0};
|
||||
*/
|
||||
static float lmodel_ambient[] = {1.0, 1.0, 1.0, 1.0};
|
||||
static float lmodel_twoside[] = {GL_FALSE};
|
||||
|
||||
glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
|
||||
glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
|
||||
glLightfv(GL_LIGHT0, GL_POSITION, position0);
|
||||
glEnable(GL_LIGHT0);
|
||||
|
||||
glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
|
||||
glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
|
||||
glLightfv(GL_LIGHT1, GL_POSITION, position1);
|
||||
glEnable(GL_LIGHT1);
|
||||
|
||||
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
|
||||
glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
|
||||
|
||||
glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_mat_shininess);
|
||||
glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_mat_specular);
|
||||
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, front_mat_diffuse);
|
||||
glEnable(GL_LIGHTING);
|
||||
}
|
||||
|
||||
|
||||
static void init_program(void)
|
||||
{
|
||||
/*
|
||||
* c[0..3] = modelview matrix
|
||||
* c[4..7] = inverse modelview matrix
|
||||
* c[30] = color scale
|
||||
* c[31] = color bias
|
||||
*/
|
||||
static const char prog[] =
|
||||
"!!VP1.0\n"
|
||||
|
||||
"# RGB is proportional to XYZ \n"
|
||||
|
||||
"MUL R0, v[OPOS], c[30]; \n"
|
||||
"ADD o[COL0], R0, c[31]; \n"
|
||||
|
||||
"# Continue with typical modelview/projection\n"
|
||||
"MOV R3, v[OPOS]; \n"
|
||||
"DP4 o[HPOS].x, c[0], R3 ; # object x MVP -> clip\n"
|
||||
"DP4 o[HPOS].y, c[1], R3 ;\n"
|
||||
"DP4 o[HPOS].z, c[2], R3 ;\n"
|
||||
"DP4 o[HPOS].w, c[3], R3 ;\n"
|
||||
|
||||
"END";
|
||||
|
||||
static const GLfloat scale[4] = {2.0, 2.0, 2.0, 0.0};
|
||||
static const GLfloat bias[4] = {1.0, 1.0, 1.0, 0.0};
|
||||
|
||||
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);
|
||||
|
||||
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 30, scale);
|
||||
glProgramParameter4fvNV(GL_VERTEX_PROGRAM_NV, 31, bias);
|
||||
}
|
||||
|
||||
|
||||
static void init(void)
|
||||
{
|
||||
xrot = 0;
|
||||
yrot = 0;
|
||||
glClearColor(0.0, 0.0, 1.0, 0.0);
|
||||
glEnable( GL_DEPTH_TEST );
|
||||
glEnable(GL_NORMALIZE);
|
||||
InitMaterials();
|
||||
read_surface( "../demos/isosurf.dat" );
|
||||
init_program();
|
||||
}
|
||||
|
||||
|
||||
static void Reshape(int width, int height)
|
||||
{
|
||||
glViewport(0, 0, (GLint)width, (GLint)height);
|
||||
glMatrixMode(GL_PROJECTION);
|
||||
glLoadIdentity();
|
||||
glFrustum( -1.0, 1.0, -1.0, 1.0, 5, 25 );
|
||||
glMatrixMode(GL_MODELVIEW);
|
||||
glLoadIdentity();
|
||||
glTranslatef(0, 0, -15);
|
||||
}
|
||||
|
||||
|
||||
|
||||
static void Key( unsigned char key, int x, int y )
|
||||
{
|
||||
(void) x;
|
||||
(void) y;
|
||||
switch (key) {
|
||||
case 27:
|
||||
exit(0);
|
||||
case 'a':
|
||||
useArrays = !useArrays;
|
||||
printf("use arrays: %s\n", useArrays ? "yes" : "no");
|
||||
break;
|
||||
case 'p':
|
||||
useProgram = !useProgram;
|
||||
printf("use program: %s\n", useProgram ? "yes" : "no");
|
||||
break;
|
||||
}
|
||||
glutPostRedisplay();
|
||||
}
|
||||
|
||||
|
||||
static void SpecialKey( int key, int x, int y )
|
||||
{
|
||||
(void) x;
|
||||
(void) y;
|
||||
switch (key) {
|
||||
case GLUT_KEY_LEFT:
|
||||
yrot -= 15.0;
|
||||
break;
|
||||
case GLUT_KEY_RIGHT:
|
||||
yrot += 15.0;
|
||||
break;
|
||||
case GLUT_KEY_UP:
|
||||
xrot += 15.0;
|
||||
break;
|
||||
case GLUT_KEY_DOWN:
|
||||
xrot -= 15.0;
|
||||
break;
|
||||
default:
|
||||
return;
|
||||
}
|
||||
glutPostRedisplay();
|
||||
}
|
||||
|
||||
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
glutInit(&argc, argv);
|
||||
glutInitDisplayMode( GLUT_DEPTH | GLUT_RGB | GLUT_DOUBLE );
|
||||
glutInitWindowPosition(0, 0);
|
||||
glutInitWindowSize(400, 400);
|
||||
if (glutCreateWindow("Isosurface") <= 0) {
|
||||
exit(0);
|
||||
}
|
||||
glutReshapeFunc(Reshape);
|
||||
glutKeyboardFunc(Key);
|
||||
glutSpecialFunc(SpecialKey);
|
||||
glutDisplayFunc(Display);
|
||||
|
||||
init();
|
||||
|
||||
glutMainLoop();
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue