progs/trivial: draw non-interleaved arrays out of one vbo
This commit is contained in:
Keith Whitwell
parent
39320c1bee
commit
2312f697a2
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@ -111,6 +111,7 @@ SOURCES = \
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tri-scissor-tri.c \
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tri-stencil.c \
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tri-stipple.c \
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tri-multitex-vbo.c \
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tri-tex.c \
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tri-tex-3d.c \
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tri-tri.c \
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@ -107,6 +107,7 @@ progs = [
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'tri-scissor-tri',
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'tri-stencil',
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'tri-stipple',
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'tri-multitex-vbo',
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'tri-tex',
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'tri-tex-3d',
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'tri-tri',
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@ -0,0 +1,260 @@
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/*
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* Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that (i) the above copyright notices and this permission notice appear in
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* all copies of the software and related documentation, and (ii) the name of
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* Silicon Graphics may not be used in any advertising or
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* publicity relating to the software without the specific, prior written
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* permission of Silicon Graphics.
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*
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* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF
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* ANY KIND,
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* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR
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* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <GL/glew.h>
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#include <GL/glut.h>
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#define NR_VERTS 4
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struct {
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GLfloat position[NR_VERTS][4];
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GLubyte color[NR_VERTS][4];
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GLfloat tex0[NR_VERTS][2];
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GLfloat tex1[NR_VERTS][2];
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} verts = {
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{ { 0.9, -0.9, 0.0, 1.0 },
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{ 0.9, 0.9, 0.0, 1.0 },
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{ -0.9, 0.9, 0.0, 1.0 },
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{ -0.9, -0.9, 0.0, 1.0 } },
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{ { 0x00, 0x00, 0xff, 0x00 },
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{ 0x00, 0xff, 0x00, 0x00 },
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{ 0xff, 0x00, 0x00, 0x00 },
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{ 0xff, 0xff, 0xff, 0x00 }
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},
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{ { 1, -1 },
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{ 1, 1 },
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{ -1, 1 },
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{ -1, -1 } },
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{ { 3, 0 },
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{ 0, 3 },
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{ -3, 0 },
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{ 0, -3} },
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};
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GLuint indices[] = { 0, 1, 2, 3 };
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GLuint arrayObj, elementObj;
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GLenum doubleBuffer;
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#define Offset(ptr, member) (void *)((const char *)&((ptr)->member) - (const char *)(ptr))
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static void Init(void)
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{
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GLuint texObj[2];
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fprintf(stderr, "GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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fprintf(stderr, "GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
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fprintf(stderr, "GL_VENDOR = %s\n", (char *) glGetString(GL_VENDOR));
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glClearColor(0.0, 0.0, 1.0, 0.0);
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glGenTextures(2, texObj);
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#define SIZE 32
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{
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GLubyte tex2d[SIZE][SIZE][3];
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GLint s, t;
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for (s = 0; s < SIZE; s++) {
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for (t = 0; t < SIZE; t++) {
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tex2d[t][s][0] = s*255/(SIZE-1);
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tex2d[t][s][1] = t*255/(SIZE-1);
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tex2d[t][s][2] = 0;
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}
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}
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glActiveTextureARB(GL_TEXTURE0_ARB);
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glBindTexture(GL_TEXTURE_2D, texObj[0]);
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glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
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GL_RGB, GL_UNSIGNED_BYTE, tex2d);
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glEnable(GL_TEXTURE_2D);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
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}
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{
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GLubyte tex2d[SIZE][SIZE][3];
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GLint s, t;
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for (s = 0; s < SIZE; s++) {
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for (t = 0; t < SIZE; t++) {
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GLboolean on = ((s/4) ^ (t/4)) & 1;
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tex2d[t][s][0] = on ? 128 : 0;
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tex2d[t][s][1] = on ? 128 : 0;
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tex2d[t][s][2] = on ? 128 : 0;
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}
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}
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glActiveTextureARB(GL_TEXTURE1_ARB);
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glBindTexture(GL_TEXTURE_2D, texObj[1]);
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glTexImage2D(GL_TEXTURE_2D, 0, 3, SIZE, SIZE, 0,
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GL_RGB, GL_UNSIGNED_BYTE, tex2d);
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glEnable(GL_TEXTURE_2D);
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glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_ADD);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_REPEAT);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
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}
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glActiveTextureARB( GL_TEXTURE0_ARB );
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{
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glGenBuffersARB(1, &arrayObj);
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glGenBuffersARB(1, &elementObj);
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glBindBufferARB(GL_ARRAY_BUFFER_ARB, arrayObj);
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glBindBufferARB(GL_ELEMENT_ARRAY_BUFFER_ARB, elementObj);
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glBufferDataARB(GL_ARRAY_BUFFER_ARB, sizeof(verts), &verts, GL_STATIC_DRAW_ARB);
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glBufferDataARB(GL_ELEMENT_ARRAY_BUFFER_ARB, sizeof(indices), indices, GL_STATIC_DRAW_ARB);
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glEnableClientState( GL_VERTEX_ARRAY );
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glVertexPointer( 4, GL_FLOAT, 0, Offset(&verts, position) );
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glEnableClientState( GL_COLOR_ARRAY );
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glColorPointer( 4, GL_UNSIGNED_BYTE, 0, Offset(&verts, color) );
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glClientActiveTextureARB( GL_TEXTURE0_ARB );
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glEnableClientState( GL_TEXTURE_COORD_ARRAY );
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glTexCoordPointer( 2, GL_FLOAT, 0, Offset(&verts, tex0) );
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glClientActiveTextureARB( GL_TEXTURE1_ARB );
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glEnableClientState( GL_TEXTURE_COORD_ARRAY );
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glTexCoordPointer( 2, GL_FLOAT, 0, Offset(&verts, tex1) );
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glClientActiveTextureARB( GL_TEXTURE0_ARB );
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}
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}
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static void Reshape(int width, int height)
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{
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glViewport(0, 0, (GLint)width, (GLint)height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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/* glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0); */
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glMatrixMode(GL_MODELVIEW);
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}
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static void Key(unsigned char key, int x, int y)
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{
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switch (key) {
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case 27:
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exit(1);
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default:
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return;
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}
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glutPostRedisplay();
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}
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static void Draw(void)
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{
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glClear(GL_COLOR_BUFFER_BIT);
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glDrawElements( GL_TRIANGLES, 3, GL_UNSIGNED_INT, NULL );
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glFlush();
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if (doubleBuffer) {
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glutSwapBuffers();
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}
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}
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static GLenum Args(int argc, char **argv)
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{
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GLint i;
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doubleBuffer = GL_FALSE;
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for (i = 1; i < argc; i++) {
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if (strcmp(argv[i], "-sb") == 0) {
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doubleBuffer = GL_FALSE;
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} else if (strcmp(argv[i], "-db") == 0) {
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doubleBuffer = GL_TRUE;
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} else {
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fprintf(stderr, "%s (Bad option).\n", argv[i]);
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return GL_FALSE;
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}
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}
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return GL_TRUE;
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}
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int main(int argc, char **argv)
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{
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GLenum type;
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glutInit(&argc, argv);
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if (Args(argc, argv) == GL_FALSE) {
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exit(1);
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}
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glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
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type = GLUT_RGB | GLUT_ALPHA;
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type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
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glutInitDisplayMode(type);
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if (glutCreateWindow(*argv) == GL_FALSE) {
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exit(1);
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}
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glewInit();
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Init();
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glutReshapeFunc(Reshape);
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glutKeyboardFunc(Key);
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glutDisplayFunc(Draw);
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glutMainLoop();
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return 0;
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}
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