Attachment 34847 Details for Bug 27566 – the test program (compile with -std=c99)

the test program (compile with -std=c99)

galnpot.c (text/x-csrc), 3.01 KB, created by Wiktor Janas on 2010-04-09 08:36:11 UTC

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Creator: Wiktor Janas

Created: 2010-04-09 08:36:11 UTC

Size: 3.01 KB

patch

obsolete

>#include <stdlib.h>
>#include <stdio.h>
>#include <stdint.h>
>
>#define GL_GLEXT_PROTOTYPES
>#include <GL/gl.h>
>#include <GL/glut.h>
>
>#define TILE_SIZE 16
>#define TILE_HCNT 16
>#define TILE_VCNT 16
>
>#define WIDTH  (TILE_SIZE*TILE_HCNT)
>#define HEIGHT (TILE_SIZE*TILE_VCNT)
>
>static uint8_t texdata[WIDTH*HEIGHT*3];
>#define tex_v(i)   ((i) >= 0 && (i) < sizeof(texdata) ? texdata + (i) : (uint8_t *)0)
>#define tex_r(x,y) tex_v(((x)+(y)*WIDTH)*3+0)
>#define tex_g(x,y) tex_v(((x)+(y)*WIDTH)*3+1)
>#define tex_b(x,y) tex_v(((x)+(y)*WIDTH)*3+2)
>
>static GLuint texid;
>
>/*
> * the folowing draws uv-test-grid-like picture
> */
>static void make_tile(int tx, int ty)
>{
>    uint8_t gray = ((tx ^ ty) & 1) ? 128 : 224;
>    for(int x=tx*TILE_SIZE; x<(tx+1)*TILE_SIZE; x++)
>        for(int y=ty*TILE_SIZE; y<(ty+1)*TILE_SIZE; y++)
>            *tex_r(x,y) = *tex_g(x,y) = *tex_b(x,y) = gray;
>    
>    uint8_t r=0, g=0, b=0;
>    switch((tx + ty) % 6) {
>        case 0: r=255; break;
>        case 1: g=255; break;
>        case 2: b=255; break;
>        case 3: r=255; b=255; break;
>        case 4: r=255; g=255; break;
>        case 5: g=255; b=255; break;
>    }
>
>    int x0 = (tx + tx+1)*TILE_SIZE/2,
>        y0 = (ty + ty+1)*TILE_SIZE/2,
>        d = TILE_SIZE/4;
>
>    for(int x=x0-d; x<=x0+d; x++)
>        *tex_r(x,y0) = r, *tex_g(x,y0) = g, *tex_b(x,y0) = b;
>    for(int y=y0-d; y<=y0+d; y++)
>        *tex_r(x0,y) = r, *tex_g(x0,y) = g, *tex_b(x0,y) = b;
>}
>
>static void make_tex(void)
>{
>    for(int tx=0; tx<TILE_HCNT; tx++)
>        for(int ty=0; ty<TILE_VCNT; ty++)
>            make_tile(tx,ty);
>}
>
>static void init(void)
>{
>    glClearColor(1,0,0,1);
>    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
>
>    make_tex();
>
>    glGenTextures(1, &texid);
>    glBindTexture(GL_TEXTURE_2D,texid);
>    /* the MIN_FILTER setting MUST be present to cause segfault */
>    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
>    //glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
>    glTexImage2D(GL_TEXTURE_2D,0, GL_RGB,WIDTH,HEIGHT,0, GL_RGB,GL_UNSIGNED_BYTE, texdata);
>    glEnable(GL_TEXTURE_2D);
>}
>
>static void render(void)
>{
>    glClear(GL_COLOR_BUFFER_BIT);
>    glLoadIdentity();
>
>    glWindowPos2i(0,0);
>    glDrawPixels(WIDTH, HEIGHT, GL_RGB, GL_UNSIGNED_BYTE, texdata);
>
>/*
>    this works as expected:
>
>    glBegin(GL_QUADS);
>      glTexCoord2f(0,0); glVertex2f(-1,-1); 
>      glTexCoord2f(1,0); glVertex2f( 1,-1); 
>      glTexCoord2f(1,1); glVertex2f( 1, 1); 
>      glTexCoord2f(0,1); glVertex2f(-1, 1); 
>    glEnd();
>*/
>
>    glutSwapBuffers();
>}
>
>static void resize(int w, int h)
>{
>    int matrix;
>    glGetIntegerv(GL_MATRIX_MODE, &matrix);
>    glMatrixMode(GL_PROJECTION);
>    glLoadIdentity();
>    glViewport(0,0,w,h);
>    glMatrixMode(matrix);
>}
>
>int main (int argc, char *argv[])
>{
>    glutInit(&argc, argv);
>    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA);
>    glutInitWindowSize(WIDTH,HEIGHT);
>    glutCreateWindow("r300g NPOT test");
>
>    glutDisplayFunc(render);
>    glutReshapeFunc(resize);
>
>    init();
>    resize(WIDTH,HEIGHT);
>
>    glutMainLoop();
>
>    return 0;
>}

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Attachments on bug 27566: 34847 | 34848

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