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/* Test GL_ARB_fragment_program */
#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();
glColor4f(0, 0.5, 0, 1);
glColor4f(0, 1, 0, 1);
glBegin(GL_POLYGON);
glVertex2f(-1, -1);
glVertex2f( 1, -1);
glVertex2f( 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_FRAGMENT_PROGRAM_ARB, prognum);
glProgramStringARB(GL_FRAGMENT_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 )
{
static const char *prog0 =
"!!ARBfp1.0\n"
"TEMP R0, RC, HC, H0, H1, H2, H3, H30 ;\n"
"MUL result.color, R0, fragment.position; \n"
"ADD result.color, H3, fragment.texcoord; \n"
"ADD_SAT result.color, H3, fragment.texcoord; \n"
"MUL result.color.xy, R0.wzyx, fragment.position; \n"
"MUL result.color, H0, fragment.position; \n"
"MUL result.color, -H0, fragment.position; \n"
"MOV RC, H1; \n"
"MOV HC, H2; \n"
"END \n"
;
/* masked updates, defines, declarations */
static const char *prog1 =
"!!ARBfp1.0\n"
"PARAM foo = {1., 2., 3., 4.}; \n"
"PARAM foo2 = 5.; \n"
"PARAM foo3 = {5., 6., 7., 8.}; \n"
"PARAM bar = 3.; \n"
"TEMP R0, R1, RC, EQ, NE, bar2; \n"
"ALIAS bar3 = bar; \n"
"MOV result.color.xy, R0; \n"
"MOV result.color, R0; \n"
"MOV result.color.xyzw, R0; \n"
"MOV result.color.xy, R0; \n"
"MOV RC.x, R1.x; \n"
"KIL NE; \n"
"KIL EQ.xyxy; \n"
"END \n"
;
/* texture instructions */
static const char *prog2 =
"!!ARBfp1.0\n"
"TEMP R0, R1, R2, R3;\n"
"TEX R0, fragment.texcoord, texture[0], 2D; \n"
"TEX R1, fragment.texcoord[1], texture[1], CUBE; \n"
"TEX R2, fragment.texcoord[2], texture[2], 3D; \n"
"TXP R3, fragment.texcoord[3], texture[3], RECT; \n"
"MUL result.color, R0, fragment.color; \n"
"END \n"
;
/* test negation, absolute value */
static const char *prog3 =
"!!ARBfp1.0\n"
"TEMP R0, R1;\n"
"MOV R0, R1; \n"
"MOV R0, -R1; \n"
"MOV result.color, R0; \n"
"END \n"
;
/* literal constant sources */
static const char *prog4 =
"!!ARBfp1.0\n"
"TEMP R0, R1;\n"
"PARAM Pi = 3.14159; \n"
"MOV R0, {1., -2., +3., 4.}; \n"
"MOV R0, 5.; \n"
"MOV R0, -5.; \n"
"MOV R0, 5.; \n"
"MOV R0, Pi; \n"
"MOV result.color, R0; \n"
"END \n"
;
/* change the fragment color in a simple way */
static const char *prog10 =
"!!ARBfp1.0\n"
"PARAM blue = {0., 0., 1., 0.};\n"
"PARAM color = {1., 0., 0., 1.};\n"
"TEMP R0; \n"
"MOV R0, fragment.color; \n"
"#ADD result.color, R0, fragment.color; \n"
"#ADD result.color, blue, fragment.color; \n"
"#ADD result.color, {1., 0., 0., 0.}, fragment.color; \n"
"ADD result.color, color, fragment.color; \n"
"END \n"
;
GLuint progs[20];
glGenProgramsARB(20, progs);
assert(progs[0]);
assert(progs[1]);
assert(progs[0] != progs[1]);
printf("program 0:\n");
load_program(prog0, progs[0]);
printf("program 1:\n");
load_program(prog1, progs[1]);
printf("program 2:\n");
load_program(prog2, progs[2]);
printf("program 3:\n");
load_program(prog3, progs[3]);
printf("program 4:\n");
load_program(prog4, progs[4]);
printf("program 10:\n");
load_program(prog10, progs[5]);
glEnable(GL_FRAGMENT_PROGRAM_ARB);
glEnable(GL_ALPHA_TEST);
glAlphaFunc(GL_ALWAYS, 0.0);
}
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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