Attachment 11055 Details for Bug 11910 – test case

test case

vbuffer.c (text/plain), 2.67 KB, created by WuNian on 2007-08-09 00:27:49 UTC

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Creator: WuNian

Created: 2007-08-09 00:27:49 UTC

Size: 2.67 KB

patch

obsolete

>#include <GL/glut.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <math.h>
>#include <string.h>
>
>#define WINDSIZEX 100
>#define WINDSIZEY 100
>
>void init(void)
>{
>   glClearColor (0,0,0,1);
>   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>   glDisable (GL_DITHER);
>}
>
>//color data
>static  GLfloat colbuf[] = {
>   0.2, 0.4, 0.6, 0.8,
>   0.4, 0.6, 0.8, 0.2,
>   0.6, 0.8, 0.2, 0.4,
>   0.8, 0.2, 0.4, 0.6
>};
>
>//vertex data
>static  GLint vertexbuf[] = {
>   0, 0,
>   20, 0,
>   20, 20,
>   0, 20
>};
>
>#define BUF_OFFSET(i) ((char *)NULL+ (i))
>
>static void test(void)
>{   
>   GLuint bufname[1];
>   GLfloat *readBuf;
>   GLubyte *allbuf, *bufptr, *p;
>   int  allsize, elemoffset, offset;
>   GLuint  elemArray[] = {0, 1, 2, 3};
>
>   offset = 1;
>
>   glGenBuffers(1, bufname);
>
>   readBuf = (GLfloat *)malloc (4* sizeof (GLfloat) * WINDSIZEX * WINDSIZEY);
>   //create an allbuf to store all data(vertex, color, element and extra space
>   //to chnage offset values
>   allsize = sizeof(colbuf) + sizeof(vertexbuf) + sizeof(elemArray) + offset;
>   allbuf = malloc( allsize * sizeof(GLubyte) );
>
>   glBindBuffer(GL_ARRAY_BUFFER, bufname);
>   glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, bufname);
>   glEnableClientState (GL_COLOR_ARRAY);
>   glEnableClientState (GL_VERTEX_ARRAY);
>
>   glColorPointer (4, GL_FLOAT, 0, BUF_OFFSET(offset));
>   glVertexPointer(2, GL_INT, 0, BUF_OFFSET(offset + sizeof(colbuf)));
>   //calculate the offset where indices are stored
>   elemoffset = sizeof(colbuf) + sizeof(vertexbuf) + offset;
>
>   glClear (GL_COLOR_BUFFER_BIT);
>   bufptr = allbuf;
>
>   p = memcpy(bufptr + offset, colbuf, sizeof(colbuf));
>   p = memcpy(p + sizeof(colbuf),
>               vertexbuf, sizeof(vertexbuf));
>
>   glBufferData(GL_ARRAY_BUFFER, allsize,
>                     bufptr, GL_STREAM_DRAW);
>   glBufferSubData(GL_ELEMENT_ARRAY_BUFFER, elemoffset,
>               sizeof(elemArray), elemArray);
>   glDrawElements(GL_POLYGON, 4, GL_UNSIGNED_INT, BUF_OFFSET(elemoffset));
>   glFlush();
>   glReadPixels(0, 0, WINDSIZEX, WINDSIZEY, GL_RGBA,
>               GL_FLOAT, readBuf);
>
>   glDeleteBuffers(1, &bufname);
>   glDisableClientState (GL_COLOR_ARRAY);
>   glDisableClientState (GL_VERTEX_ARRAY);
>
>   free(readBuf);
>   free(allbuf);
>}
>
>void display(void)
>{
>   glViewport(0, 0, WINDSIZEX, WINDSIZEY);
>   glMatrixMode(GL_PROJECTION);
>   glLoadIdentity();
>   gluOrtho2D(0, WINDSIZEX, 0, WINDSIZEY);
>   glMatrixMode(GL_MODELVIEW);
>   glLoadIdentity();
>
>   test();
>}
>
>int main(int argc, char** argv)
>{
>   glutInit(&argc, argv);
>   glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
>   glutInitWindowSize(WINDSIZEX, WINDSIZEY);
>   glutInitWindowPosition(100, 100);
>   glutCreateWindow(argv[0]);
>   init();
>   glutDisplayFunc(display);
>   glutMainLoop();
>   return 0; 
>}

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