progs/fp/tri-swz2.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
  31
  32 #define CI_OFFSET_1 16
  33 #define CI_OFFSET_2 32
  34
  35
  36 GLenum doubleBuffer;
  37
  38 static void Init( void )
  39 {
  40    static const char *modulate2D =
  41       "!!ARBfp1.0\n"
  42       "TEMP R0, R1;\n"
  43       "SWZ result.color, fragment.color, 1, 0, 0, 1; \n"
  44       "END"
  45       ;
  46    GLuint modulateProg;
  47
  48    if (!glutExtensionSupported("GL_ARB_fragment_program")) {
  49       printf("Error: GL_ARB_fragment_program not supported!\n");
  50       exit(1);
  51    }
  52    printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
  53
  54    /* Setup the fragment program */
  55    glGenProgramsARB(1, &modulateProg);
  56    glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, modulateProg);
  57    glProgramStringARB(GL_FRAGMENT_PROGRAM_ARB, GL_PROGRAM_FORMAT_ASCII_ARB,
  58                         strlen(modulate2D), (const GLubyte *)modulate2D);
  59
  60    printf("glGetError = 0x%x\n", (int) glGetError());
  61    printf("glError(GL_PROGRAM_ERROR_STRING_ARB) = %s\n",
  62           (char *) glGetString(GL_PROGRAM_ERROR_STRING_ARB));
  63
  64    glEnable(GL_FRAGMENT_PROGRAM_ARB);
  65
  66    glClearColor(.3, .3, .3, 0);
  67 }
  68
  69 static void Reshape(int width, int height)
  70 {
  71
  72     glViewport(0, 0, (GLint)width, (GLint)height);
  73
  74     glMatrixMode(GL_PROJECTION);
  75     glLoadIdentity();
  76     glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
  77     glMatrixMode(GL_MODELVIEW);
  78 }
  79
  80 static void Key(unsigned char key, int x, int y)
  81 {
  82
  83     switch (key) {
  84       case 27:
  85         exit(1);
  86       default:
  87         return;
  88     }
  89
  90     glutPostRedisplay();
  91 }
  92
  93 static void Draw(void)
  94 {
  95    glClear(GL_COLOR_BUFFER_BIT);
  96
  97    glBegin(GL_TRIANGLES);
  98    glColor3f(0,0,1);
  99    glVertex3f( 0.9, -0.9, -30.0);
 100    glColor3f(1,0,0);
 101    glVertex3f( 0.9,  0.9, -30.0);
 102    glColor3f(0,1,0);
 103    glVertex3f(-0.9,  0.0, -30.0);
 104    glEnd();
 105
 106    glFlush();
 107
 108    if (doubleBuffer) {
 109       glutSwapBuffers();
 110    }
 111 }
 112
 113 static GLenum Args(int argc, char **argv)
 114 {
 115     GLint i;
 116
 117     doubleBuffer = GL_FALSE;
 118
 119     for (i = 1; i < argc; i++) {
 120         if (strcmp(argv[i], "-sb") == 0) {
 121             doubleBuffer = GL_FALSE;
 122         } else if (strcmp(argv[i], "-db") == 0) {
 123             doubleBuffer = GL_TRUE;
 124         } else {
 125             fprintf(stderr, "%s (Bad option).\n", argv[i]);
 126             return GL_FALSE;
 127         }
 128     }
 129     return GL_TRUE;
 130 }
 131
 132 int main(int argc, char **argv)
 133 {
 134     GLenum type;
 135
 136     glutInit(&argc, argv);
 137
 138     if (Args(argc, argv) == GL_FALSE) {
 139         exit(1);
 140     }
 141
 142     glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
 143
 144     type = GLUT_RGB;
 145     type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
 146     glutInitDisplayMode(type);
 147
 148     if (glutCreateWindow("First Tri") == GL_FALSE) {
 149         exit(1);
 150     }
 151
 152     Init();
 153
 154     glutReshapeFunc(Reshape);
 155     glutKeyboardFunc(Key);
 156     glutDisplayFunc(Draw);
 157     glutMainLoop();
 158         return 0;
 159 }