/* * 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 #include #include #include #include #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; }