[Mesa-dev] cva+clip bug

[Miklós Fazekas]

Here is a simple program which produces clipping error with FX version of 
Mesa.
The problem seems that the VB->ClipPtr doesn't hold the correct values. They
are in the ctx->CVA->VB->ClipPtr.


#include <stdlib.h>
#include "glut.h"

GLboolean showbug = GL_TRUE;
GLboolean usecva = GL_TRUE;
void keyb(unsigned char ch,int x,int y)
{
  if (ch == 'b')
  {
       showbug = !showbug;
       glutPostRedisplay();
  }
}

void display(void)
{

   GLfloat vertices[] = { 0.5,-0.5,
         -1.5,-0.5,
         -1.5,0.5,
         0.5,0.5};
   GLfloat colors[] = {1.0,0.0,0.0,
                    0.0,1.0,0.0,
                    0.0,0.0,1.0,
                    0.0,1.0,0.0};
   GLuint elements[] = {/*0,1,2,*/0,2,3};

    int i;

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    glClear(GL_COLOR_BUFFER_BIT );

    glVertexPointer(2,GL_FLOAT,2*4,vertices);
    glColorPointer(3,GL_FLOAT,3*4,colors);
    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_COLOR_ARRAY);

    if (showbug)
       glLockArraysEXT(0,4);

    glVertexPointer(2,GL_FLOAT,2*4,vertices);
    glDrawElements(GL_TRIANGLES,3,GL_UNSIGNED_INT,elements);


    if (showbug)
       glUnlockArraysEXT();


    glFinish();
    glutSwapBuffers();
}

void myReshape(int w, int h)
{
    glViewport(0, 0, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode (GLUT_DOUBLE| GLUT_RGB);

    glutInitWindowSize (640, 480);

    glutCreateWindow (argv[0]);

    glutReshapeFunc (myReshape);
    glutDisplayFunc(display);
    glutKeyboardFunc(keyb);

    glutPostRedisplay();

    glutMainLoop();
    return 0;             /* ANSI C requires main to return int. */
}




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