| /* |
| * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc. |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and |
| * its documentation for any purpose is hereby granted without fee, provided |
| * that (i) the above copyright notices and this permission notice appear in |
| * all copies of the software and related documentation, and (ii) the name of |
| * Silicon Graphics may not be used in any advertising or |
| * publicity relating to the software without the specific, prior written |
| * permission of Silicon Graphics. |
| * |
| * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF |
| * ANY KIND, |
| * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY |
| * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. |
| * |
| * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR |
| * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, |
| * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
| * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF |
| * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| * OF THIS SOFTWARE. |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <GL/glew.h> |
| #include <GL/glut.h> |
| |
| #define NR_VERTS 4 |
| |
| struct { |
| GLfloat position[NR_VERTS][4]; |
| GLubyte color[NR_VERTS][4]; |
| GLfloat tex0[NR_VERTS][2]; |
| GLfloat tex1[NR_VERTS][2]; |
| } verts = { |
| |
| { { 0.9, -0.9, 0.0, 1.0 }, |
| { 0.9, 0.9, 0.0, 1.0 }, |
| { -0.9, 0.9, 0.0, 1.0 }, |
| { -0.9, -0.9, 0.0, 1.0 } }, |
| |
| { { 0x00, 0x00, 0xff, 0x00 }, |
| { 0x00, 0xff, 0x00, 0x00 }, |
| { 0xff, 0x00, 0x00, 0x00 }, |
| { 0xff, 0xff, 0xff, 0x00 } |
| }, |
| |
| { { 1, -1 }, |
| { 1, 1 }, |
| { -1, 1 }, |
| { -1, -1 } }, |
| |
| { { 3, 0 }, |
| { 0, 3 }, |
| { -3, 0 }, |
| { 0, -3} }, |
| |
| }; |
| |
| GLuint indices[] = { 0, 1, 2, 3 }; |
| |
| GLuint arrayObj, elementObj; |
| |
| |
| GLenum doubleBuffer; |
| |
| |
| #define Offset(ptr, member) (void *)((const char *)&((ptr)->member) - (const char *)(ptr)) |
| |
| static void Init(void) |
| { |
| GLuint texObj[2]; |
| |
| fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); |
| fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION)); |
| fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR)); |
| fflush(stderr); |
| |
| glClearColor(0.0, 0.0, 1.0, 0.0); |
| |
| glGenTextures(2, texObj); |
| |
| #define SIZE 32 |
| { |
| GLubyte tex2d[SIZE][SIZE][3]; |
| GLint s, t; |
| |
| for (s = 0; s < SIZE; s++) { |
| for (t = 0; t < SIZE; t++) { |
| tex2d[t][s][0] = s*255/(SIZE-1); |
| tex2d[t][s][1] = t*255/(SIZE-1); |
| tex2d[t][s][2] = 0; |
| } |
| } |
| |
| glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| glActiveTextureARB(GL_TEXTURE0_ARB); |
| glBindTexture(GL_TEXTURE_2D, texObj[0]); |
| |
| |
| glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0, |
| GL_RGB, GL_UNSIGNED_BYTE, tex2d); |
| |
| glEnable(GL_TEXTURE_2D); |
| glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); |
| glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT); |
| glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| |
| glPixelStorei(GL_UNPACK_ALIGNMENT, 4); |
| } |
| |
| { |
| GLubyte tex2d[SIZE][SIZE][3]; |
| GLint s, t; |
| |
| for (s = 0; s < SIZE; s++) { |
| for (t = 0; t < SIZE; t++) { |
| GLboolean on = ((s/4) ^ (t/4)) & 1; |
| tex2d[t][s][0] = on ? 128 : 0; |
| tex2d[t][s][1] = on ? 128 : 0; |
| tex2d[t][s][2] = on ? 128 : 0; |
| } |
| } |
| |
| glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| glActiveTextureARB(GL_TEXTURE1_ARB); |
| glBindTexture(GL_TEXTURE_2D, texObj[1]); |
| |
| glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0, |
| GL_RGB, GL_UNSIGNED_BYTE, tex2d); |
| |
| glEnable(GL_TEXTURE_2D); |
| glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD); |
| glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT); |
| glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| |
| glPixelStorei(GL_UNPACK_ALIGNMENT, 4); |
| } |
| |
| glActiveTextureARB( GL_TEXTURE0_ARB ); |
| |
| |
| { |
| |
| glGenBuffersARB(1, &arrayObj); |
| glGenBuffersARB(1, &elementObj); |
| |
| glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj); |
| glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, elementObj); |
| |
| glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), &verts, GL_STATIC_DRAW_ARB); |
| glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, sizeof(indices), indices, GL_STATIC_DRAW_ARB); |
| |
| glEnableClientState( GL_VERTEX_ARRAY ); |
| glVertexPointer( 4, GL_FLOAT, 0, Offset(&verts, position) ); |
| |
| glEnableClientState( GL_COLOR_ARRAY ); |
| glColorPointer( 4, GL_UNSIGNED_BYTE, 0, Offset(&verts, color) ); |
| |
| glClientActiveTextureARB( GL_TEXTURE0_ARB ); |
| glEnableClientState( GL_TEXTURE_COORD_ARRAY ); |
| glTexCoordPointer( 2, GL_FLOAT, 0, Offset(&verts, tex0) ); |
| |
| glClientActiveTextureARB( GL_TEXTURE1_ARB ); |
| glEnableClientState( GL_TEXTURE_COORD_ARRAY ); |
| glTexCoordPointer( 2, GL_FLOAT, 0, Offset(&verts, tex1) ); |
| |
| glClientActiveTextureARB( GL_TEXTURE0_ARB ); |
| } |
| } |
| |
| static void Reshape(int width, int height) |
| { |
| |
| glViewport(0, 0, (GLint)width, (GLint)height); |
| |
| glMatrixMode(GL_PROJECTION); |
| glLoadIdentity(); |
| /* glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */ |
| glMatrixMode(GL_MODELVIEW); |
| } |
| |
| static void Key(unsigned char key, int x, int y) |
| { |
| |
| switch (key) { |
| case 27: |
| exit(1); |
| default: |
| return; |
| } |
| |
| glutPostRedisplay(); |
| } |
| |
| static void Draw(void) |
| { |
| glClear(GL_COLOR_BUFFER_BIT); |
| |
| glDrawElements( GL_TRIANGLES, 3, GL_UNSIGNED_INT, NULL ); |
| |
| glFlush(); |
| |
| if (doubleBuffer) { |
| glutSwapBuffers(); |
| } |
| } |
| |
| static GLenum Args(int argc, char **argv) |
| { |
| GLint i; |
| |
| doubleBuffer = GL_FALSE; |
| |
| for (i = 1; i < argc; i++) { |
| if (strcmp(argv[i], "-sb") == 0) { |
| doubleBuffer = GL_FALSE; |
| } else if (strcmp(argv[i], "-db") == 0) { |
| doubleBuffer = GL_TRUE; |
| } else { |
| fprintf(stderr, "%s (Bad option).\n", argv[i]); |
| return GL_FALSE; |
| } |
| } |
| return GL_TRUE; |
| } |
| |
| int main(int argc, char **argv) |
| { |
| GLenum type; |
| |
| glutInit(&argc, argv); |
| |
| if (Args(argc, argv) == GL_FALSE) { |
| exit(1); |
| } |
| |
| glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250); |
| |
| type = GLUT_RGB | GLUT_ALPHA; |
| type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; |
| glutInitDisplayMode(type); |
| |
| if (glutCreateWindow(*argv) == GL_FALSE) { |
| exit(1); |
| } |
| |
| glewInit(); |
| Init(); |
| |
| glutReshapeFunc(Reshape); |
| glutKeyboardFunc(Key); |
| glutDisplayFunc(Draw); |
| glutMainLoop(); |
| return 0; |
| } |