Attachment 11395 Details for Bug 12263 – test case

test case

stencil_bitmap.c (text/plain), 1.92 KB, created by WuNian on 2007-09-02 22:20:10 UTC

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Creator: WuNian

Created: 2007-09-02 22:20:10 UTC

Size: 1.92 KB

patch

obsolete

>#include <GL/glut.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <math.h>
>
>#define WINDSIZEX 100
>#define WINDSIZEY 100
>
>
>GLfloat *buf;
>GLubyte *clearBuf;
>GLubyte *bitmap;
>
>void init(void)
>{
>
>}
>
>static void test(void)
>{    
>   int i, bufHeight = 3;
>   GLint mask = 189;
>
>   clearBuf = malloc(sizeof(GLubyte) * WINDSIZEX * bufHeight);
>   bitmap = malloc(sizeof(GLubyte) * WINDSIZEX * bufHeight);
>   for (i = 0; i < WINDSIZEX * bufHeight; i++) {
>      clearBuf[i] = i % 256;
>      bitmap[i] = 0xFF;
>   }
>
>   glClear(GL_COLOR_BUFFER_BIT);
>
>   glEnable(GL_STENCIL_TEST);
>   glStencilMask(255); //stencil bits is 8
>   glColor4f(1.0, 1.0, 0.0, 1.0);
>   glRasterPos2f((float)0.20, (float)0.20);
>   glDrawPixels(WINDSIZEX, bufHeight, GL_STENCIL_INDEX , GL_UNSIGNED_BYTE, clearBuf);
>
>   glStencilMask(mask); 
>   glStencilFunc(GL_NEVER, 0, ~0);
>   glStencilOp(GL_ZERO, GL_KEEP, GL_KEEP);
>   //glStencilOp(GL_REPLACE, GL_KEEP, GL_KEEP);
>
>   glRasterPos2f(0.25, 0.25);
>   glBitmap(WINDSIZEX, bufHeight, 0, 0, 0, 0, bitmap);
>
>   buf = malloc(sizeof(GLfloat) * WINDSIZEX * bufHeight);
>
>   glReadPixels(0, 0, WINDSIZEX, bufHeight, GL_STENCIL_INDEX, GL_FLOAT, buf);
>   for (i = 0; i < 20; i++)
>   {
>//      printf("expected at (%d): %f, actual: %f\n", i, (float)(clearBuf[i] & ~mask), buf[i]);
>	GLint pre = clearBuf[i];
>        GLint expected = pre & ~mask;
>        printf("expected at (%d): %d, actual: %f\n", i, expected, buf[i]);
>   }
>}
>
>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_DOUBLE | GLUT_RGB | GLUT_DEPTH);
>   glutInitWindowSize(WINDSIZEX, WINDSIZEY);
>   glutInitWindowPosition(100, 100);
>   glutCreateWindow(argv[0]);
>   init();
>   glutDisplayFunc(display);
>   glutMainLoop();
>   return 0; 
>}
>

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