Attachment 129388 Details for Bug 99705 – OpenGL implementation of the test case

OpenGL implementation of the test case

missing-pixels.c (text/plain), 2.29 KB, created by Max Staudt on 2017-02-07 15:03:35 UTC

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Creator: Max Staudt

Created: 2017-02-07 15:03:35 UTC

Size: 2.29 KB

patch

obsolete

>/* Minimal OpenGL code to replicate part of
> * https://bugzilla.opensuse.org/show_bug.cgi?id=1021803
> *
> * gcc -Wall -Wextra -pedantic -o missing-pixels missing-pixels.c -lglut -lGL -lGLU
> */
>
>#include <stdlib.h>
>
>#ifdef __APPLE__
>#include <OpenGL/gl.h>
>#include <OpenGL/glu.h>
>#include <GLUT/glut.h>
>#else
>#include <GL/gl.h>
>#include <GL/glu.h>
>#include <GL/glut.h>
>#endif
>
>
>
>
>/****************************
> * GLUT window event handlers
> ***************************/
>
>void on_display(void)
>{
>  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
>
>  /* Some context.
>   * Black.
>   */
>  glColor3f(0.0, 0.0, 0.0);
>  glBegin(GL_LINE_STRIP);
>    glVertex3f(11, 10, 0);
>    glVertex3f(20, 10, 0);
>  glEnd();
>  glBegin(GL_LINE_STRIP);
>    glVertex3f(11, 20, 0);
>    glVertex3f(20, 20, 0);
>  glEnd();
>  glBegin(GL_LINE_STRIP);
>    glVertex3f(30, 11, 0);
>    glVertex3f(30, 20, 0);
>  glEnd();
>  glBegin(GL_LINE_STRIP);
>    glVertex3f(40, 11, 0);
>    glVertex3f(40, 20, 0);
>  glEnd();
>
>
>
>  /* The problematic lines.
>   * Problematic renderers omit the first pixel.
>   * Red.
>   */
>  glColor3f(1.0, 0.5, 0.5);
>  glBegin(GL_LINE_STRIP);
>    glVertex3f(10, 20, 0);
>    glVertex3f(10, 10, 0);
>  glEnd();
>
>  glBegin(GL_LINE_STRIP);
>    glVertex3f(40, 10, 0);
>    glVertex3f(30, 10, 0);
>  glEnd();
>
>
>  glFlush();
>  glutSwapBuffers();
>}
>
>void on_reshape(int w, int h)
>{
>  /* Set up the Viewport transformation */
>  glViewport(0, 0, (GLsizei) w, (GLsizei) h);
>
>  /* Set up the Projection transformation */
>  glMatrixMode(GL_PROJECTION);
>  glLoadIdentity();
>  gluOrtho2D(0, w-1, h-1, 0);
>
>  /* Switch to Model/view transformation for drawing objects */
>  glMatrixMode(GL_MODELVIEW);
>}
>
>
>
>
>/****************************
> * Main function
> ***************************/
>
>int main(int argc, char** argv)
>{
>  glutInit(&argc, argv);
>  glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGBA);
>  glutInitWindowSize (500, 500);
>  glutInitWindowPosition (100, 100);
>  glutCreateWindow (argv[0]);
>
>  /* Init GL */
>  glClearColor(1.0, 1.0, 1.0, 0.0);
>  glShadeModel(GL_FLAT);
>  /* glShadeModel(GL_SMOOTH); */
>
>  glEnable(GL_BLEND);
>  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
>
>
>  /* Init camera matrix */
>  glMatrixMode(GL_MODELVIEW);
>  glLoadIdentity();
>
>  /* Register callbacks */
>  glutDisplayFunc(on_display);
>  glutReshapeFunc(on_reshape);
>
>  glutMainLoop();
>  return 0;
>}

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Attachments on bug 99705: 129387 | 129388 | 129390 | 129391 | 129392

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