progs/fp/tri-sge2.c

   1 /*
   2  * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and
   5  * its documentation for any purpose is hereby granted without fee, provided
   6  * that (i) the above copyright notices and this permission notice appear in
   7  * all copies of the software and related documentation, and (ii) the name of
   8  * Silicon Graphics may not be used in any advertising or
   9  * publicity relating to the software without the specific, prior written
  10  * permission of Silicon Graphics.
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
  13  * ANY KIND,
  14  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  15  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  16  *
  17  * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
  18  * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  19  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  20  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  21  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  22  * OF THIS SOFTWARE.
  23  */
  24
  25 #include <stdio.h>
  26 #include <string.h>
  27 #include <stdlib.h>
  28 #define GL_GLEXT_PROTOTYPES
  29 #include <GL/glut.h>
  30 #include "GL/gl.h"
  31
  32
  33 #define CI_OFFSET_1 16
  34 #define CI_OFFSET_2 32
  35
  36
  37 GLenum doubleBuffer;
  38
  39 static void Init( void )
  40 {
  41    static const char *modulate2D =
  42       "!!ARBfp1.0\n"
  43       "TEMP R0;\n"
  44       "TEMP R1;\n"
  45       "SGE R0, fragment.color, fragment.color.yzxw; \n"
  46       "SGE R1, fragment.color, fragment.color.zxyw; \n"
  47       "MUL R0, R0, R1; \n"
  48       "MUL result.color, R0, fragment.color; \n"
  49       "END"
  50       ;
  51    GLuint modulateProg;
  52
  53    if (!glutExtensionSupported("GL_ARB_fragment_program")) {
  54       printf("Error: GL_ARB_fragment_program not supported!\n");
  55       exit(1);
  56    }
  57    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
  58
  59    /* Setup the fragment program */
  60    glGenProgramsARB(1, &modulateProg);
  61    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg);
  62    glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
  63                         strlen(modulate2D), (const GLubyte *)modulate2D);
  64
  65    printf("glGetError = 0x%x\n", (int) glGetError());
  66    printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
  67           (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
  68
  69    glEnable(GL_FRAGMENT_PROGRAM_ARB);
  70
  71    glClearColor(.3, .3, .3, 0);
  72 }
  73
  74 static void Reshape(int width, int height)
  75 {
  76
  77     glViewport(0, 0, (GLint)width, (GLint)height);
  78
  79     glMatrixMode(GL_PROJECTION);
  80     glLoadIdentity();
  81     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  82     glMatrixMode(GL_MODELVIEW);
  83 }
  84
  85 static void Key(unsigned char key, int x, int y)
  86 {
  87
  88     switch (key) {
  89       case 27:
  90         exit(1);
  91       default:
  92         return;
  93     }
  94
  95     glutPostRedisplay();
  96 }
  97
  98 static void Draw(void)
  99 {
 100    glClear(GL_COLOR_BUFFER_BIT);
 101
 102    glBegin(GL_TRIANGLES);
 103    glColor3f(0,0,1);
 104    glVertex3f( 0.9, -0.9, -30.0);
 105    glColor3f(1,0,0);
 106    glVertex3f( 0.9,  0.9, -30.0);
 107    glColor3f(0,1,0);
 108    glVertex3f(-0.9,  0.0, -30.0);
 109    glEnd();
 110
 111    glFlush();
 112
 113    if (doubleBuffer) {
 114       glutSwapBuffers();
 115    }
 116 }
 117
 118 static GLenum Args(int argc, char **argv)
 119 {
 120     GLint i;
 121
 122     doubleBuffer = GL_FALSE;
 123
 124     for (i = 1; i < argc; i++) {
 125         if (strcmp(argv[i], "-sb") == 0) {
 126             doubleBuffer = GL_FALSE;
 127         } else if (strcmp(argv[i], "-db") == 0) {
 128             doubleBuffer = GL_TRUE;
 129         } else {
 130             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 131             return GL_FALSE;
 132         }
 133     }
 134     return GL_TRUE;
 135 }
 136
 137 int main(int argc, char **argv)
 138 {
 139     GLenum type;
 140
 141     glutInit(&argc, argv);
 142
 143     if (Args(argc, argv) == GL_FALSE) {
 144         exit(1);
 145     }
 146
 147     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 148
 149     type = GLUT_RGB;
 150     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 151     glutInitDisplayMode(type);
 152
 153     if (glutCreateWindow("First Tri") == GL_FALSE) {
 154         exit(1);
 155     }
 156
 157     Init();
 158
 159     glutReshapeFunc(Reshape);
 160     glutKeyboardFunc(Key);
 161     glutDisplayFunc(Draw);
 162     glutMainLoop();
 163         return 0;
 164 }