Attachment 13391 Details for Bug 13835 – test case

test case

case_13835.c (text/plain), 3.49 KB, created by WuNian on 2007-12-27 22:59:52 UTC

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Creator: WuNian

Created: 2007-12-27 22:59:52 UTC

Size: 3.49 KB

patch

obsolete

>#include <GL/glut.h>
>#include <stdlib.h>
>#include <stdio.h>
>#include <math.h>
>
>#define WINDSIZEX 100
>#define WINDSIZEY 100
>
>#define MIN(x, y) (((x) <= (y)) ? (x) : (y))
>
>GLenum        *bufs;
>GLint          nDrawBufs;
>
>static void GetBufferInfo() {
>    GLint          i, j;
>    GLsizei        nBufs, nMaxBufs, nAuxBufs, totalBufs;
>    GLint          doingStereo, doingDoubleBuffer;
>    GLenum         bufList[4] = {
>        GL_FRONT_LEFT,
>        GL_BACK_LEFT,
>        GL_FRONT_RIGHT,
>        GL_BACK_RIGHT};
>    // Find out the maximum number of buffers that we can simultaneously
>    // draw into.
>    glGetIntegerv(GL_MAX_DRAW_BUFFERS, &nMaxBufs);
>
>    // Get the number of aux buffers that are available.
>    glGetIntegerv(GL_AUX_BUFFERS, &nAuxBufs);
>
>    // Find out if we are doing double buffering or stereo.
>    glGetIntegerv(GL_DOUBLEBUFFER, &doingDoubleBuffer);
>
>    glGetIntegerv(GL_STEREO, &doingStereo);
>
>    // Calculate the number of front & back buffers.
>    nBufs = (1 + doingDoubleBuffer) * (1 + doingStereo);
>
>    // Allocate an array where we can put the DrawBuffers list.
>    totalBufs = nBufs + nAuxBufs;
>    nDrawBufs = MIN(totalBufs, nMaxBufs);
>    bufs = malloc(nDrawBufs * sizeof(GLenum));
>
>    printf("max buffers number: %d\n", nMaxBufs);
>    printf("aux buffers number: %d\n", nAuxBufs);
>    printf("double buffers: %d\n", doingDoubleBuffer);
>    printf("stereo buffers: %d\n", doingStereo);
>    printf("draw buffers number: %d\n", nDrawBufs);
>
>    for (i=0; i<nBufs; i++) {
>        bufs[i] = bufList[i];
>    }
>    for (i=nBufs, j=0; i < nDrawBufs; i++, j++) {
>        bufs[i] = GL_AUX0 + j;
>    }
>}
>
>
>
>void init(void)
>{
>    glShadeModel(GL_SMOOTH);
>
>    glClearColor(0.6f, 0.3f, 0.8f, 1.0f);
>    glClearDepth(0.0f);
>
>    GetBufferInfo();
>}
>
>static void test(void)
>{    
>   GLfloat expected[] = {0.8, 0.3, 0.7, 1.0};
>   GLfloat      pt1[3] = { 0.8F, -0.8F,  0.0f};
>    GLfloat      pt2[3] = { 0.0F,  0.8F,  0.0f};
>    GLfloat      pt3[3] = {-0.8F, -0.8F,  0.0f};
>    GLfloat      pixBuf[4];
>   GLint i;
>
>
>   glDrawBuffers(nDrawBufs, bufs);
>
>   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>
>    /* Draw a little triangle */
>    glBegin(GL_TRIANGLES);
>    glColor4fv(expected);
>    glVertex3f(pt1[0], pt1[1], pt1[2]);
>    glVertex3f(pt2[0], pt2[1], pt2[2]);
>    glVertex3f(pt3[0], pt3[1], pt3[2]);
>    glEnd();
>
>       for (i=0; i<nDrawBufs; i++) {
>        glReadBuffer(bufs[i]);
>        glReadPixels(WINDSIZEX/2, WINDSIZEY/2, 1, 1, GL_RGBA, GL_FLOAT, pixBuf);
>
>        if ((fabs(pixBuf[0] - expected[0]) > 0.01) ||
>            (fabs(pixBuf[1] - expected[1]) > 0.01) ||
>            (fabs(pixBuf[2] - expected[2]) > 0.01) ||
>            (fabs(pixBuf[3] - expected[3]) > 0.01) ) {
>      printf("error! i is: %d\n", i);
>      printf("expected: %f %f %f %f\n", expected[0], expected[1], expected[2], expected[3]);
>      printf("actual: %f %f %f %f\n", pixBuf[0], pixBuf[1], pixBuf[2], pixBuf[3]);
>      printf("\n");
>         }
>    }
>    exit(0);
>}
>
>void display(void)
>{
>    glViewport(0, 0, WINDSIZEX, WINDSIZEY);
>        glMatrixMode(GL_PROJECTION);
>        glLoadIdentity();
>    glOrtho(-1.0, 1.0, -1.0, 1.0, 0.0, 1.0);
>    //gluOrtho2D(0, WINDSIZEX, 0, WINDSIZEY);
>        glMatrixMode(GL_MODELVIEW);
>        glLoadIdentity();
>
>    test();
>}
>
>int main(int argc, char** argv)
>{
>   glutInit(&argc, argv);
>   glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
>   glutInitWindowSize(WINDSIZEX, WINDSIZEY);
>   glutInitWindowPosition(100, 100);
>   glutCreateWindow(argv[0]);
>   init();
>   glutDisplayFunc(display);
>   glutMainLoop();
>   return 0; 
>}

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