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/* Test glGenProgramsARB(), glIsProgramARB(), glLoadProgramARB() */
#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <GL/glew.h>
#include <GL/glut.h>
static void Display( void )
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glPushMatrix();
glBegin(GL_POLYGON);
glVertexAttrib2fARB(0, -1, -1);
glVertexAttrib2fARB(0, 1, -1);
glVertexAttrib2fARB(0, 0, 1);
glEnd();
glPopMatrix();
glutSwapBuffers();
}
static void Reshape( int width, int height )
{
glViewport( 0, 0, width, height );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
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();
}
static void load_program(const char *prog, GLuint prognum)
{
int a;
GLint errorpos, errno;
glBindProgramARB(GL_VERTEX_PROGRAM_ARB, prognum);
glProgramStringARB(GL_VERTEX_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
strlen(prog), (const GLubyte *) prog);
assert(glIsProgramARB(prognum));
errno = glGetError();
printf("glGetError = %d\n", errno);
if (errno != GL_NO_ERROR)
{
glGetIntegerv(GL_PROGRAM_ERROR_POSITION_ARB, &errorpos);
printf("errorpos: %d\n", errorpos);
printf("%s\n", (char *)glGetString(GL_PROGRAM_ERROR_STRING_ARB));
for (a=-10; a<10; a++)
{
if ((errorpos+a < 0) || (errorpos+a >= strlen(prog))) continue;
printf("%c", prog[errorpos+a]);
}
printf("\n");
exit(1);
}
}
static void Init( void )
{
GLuint prognum[4];
static const char *prog1 =
"!!ARBvp1.0\n"
"TEMP R0;\n"
"MUL result.color.primary.xyz, R0, program.local[35]; \n"
"END\n";
static const char *prog2 =
"!!ARBvp1.0\n"
"#\n"
"# c[0-3] = modelview projection (composite) matrix\n"
"# c[32] = normalized light direction in object-space\n"
"# c[35] = yellow diffuse material, (1.0, 1.0, 0.0, 1.0)\n"
"# c[64].x = 0.0\n"
"# c[64].z = 0.125, a scaling factor\n"
"TEMP R0, R1;\n"
"#\n"
"# outputs diffuse illumination for color and perturbed position\n"
"#\n"
"DP3 R0, program.local[32], vertex.normal; # light direction DOT normal\n"
"MUL result.color.primary.xyz, R0, program.local[35]; \n"
"MAX R0, program.local[64].x, R0; \n"
"MUL R0, R0, vertex.normal; \n"
"MUL R0, R0, program.local[64].z; \n"
"ADD R1, vertex.position, -R0; # perturb object space position\n"
"DP4 result.position.x, state.matrix.mvp.row[3], R1; \n"
"DP4 result.position.y, state.matrix.mvp.row[1], R1; \n"
"DP4 result.position.z, state.matrix.mvp.row[2], R1; \n"
"DP4 result.position.w, state.matrix.mvp.row[3], R1; \n"
"END\n";
static const char *prog3 =
"!!ARBvp1.0\n"
"TEMP R0, R1, R2, R3;\n"
"DP4 result.position.x, state.matrix.mvp.row[0], vertex.position;\n"
"DP4 result.position.y, state.matrix.mvp.row[1], vertex.position;\n"
"DP4 result.position.z, state.matrix.mvp.row[2], vertex.position;\n"
"DP4 result.position.w, state.matrix.mvp.row[3], vertex.position;\n"
"DP3 R0.x, state.matrix.modelview.inverse.row[0], vertex.normal;\n"
"DP3 R0.y, state.matrix.modelview.inverse.row[1], vertex.normal;\n"
"DP3 R0.z, state.matrix.modelview.inverse.row[2], vertex.normal;\n"
"DP3 R1.x, program.env[32], R0; # R1.x = Lpos DOT n'\n"
"DP3 R1.y, program.env[33], R0; # R1.y = hHat DOT n'\n"
"MOV R1.w, program.local[38].x; # R1.w = specular power\n"
"LIT R2, R1; # Compute lighting values\n"
"MAD R3, program.env[35].x, R2.y, program.env[35].y; # diffuse + emissive\n"
"MAD result.color.primary.xyz, program.env[36], R2.z, R3; # + specular\n"
"END\n";
static const char *prog4 =
"!!ARBvp1.0\n"
"TEMP R2, R3;\n"
"PARAM foo = {0., 0., 0., 1.};\n"
"PARAM blah[] = { program.local[0..8] };\n"
"ADDRESS A0;\n"
"ARL A0.x, foo.x;\n"
"DP4 R2, R3, blah[A0.x].x;\n"
"DP4 R2, R3, blah[A0.x + 5];\n"
"DP4 result.position, R3, blah[A0.x - 4];\n"
"END\n";
glGenProgramsARB(4, prognum);
load_program(prog1, prognum[0]);
load_program(prog2, prognum[1]);
load_program(prog3, prognum[2]);
load_program(prog4, prognum[3]);
}
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]);
glewInit();
glutReshapeFunc( Reshape );
glutKeyboardFunc( Key );
glutDisplayFunc( Display );
Init();
glutMainLoop();
return 0;
}
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