diff options
Diffstat (limited to 'progs/tests')
| -rw-r--r-- | progs/tests/vparray.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/progs/tests/vparray.c b/progs/tests/vparray.c new file mode 100644 index 0000000000..d7d2db2bdb --- /dev/null +++ b/progs/tests/vparray.c @@ -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; +} |