153 lines
3.2 KiB
C
153 lines
3.2 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <windows.h>
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#include <GL/gl.h>
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#include <GL/glu.h>
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#include "glaux.h"
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HGLRC ctx2;
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void Initialize(void)
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{
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ctx2 = wglCreateContext(auxGetHDC());
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if (ctx2 == NULL)
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{
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printf("Unable to create ctx2\n");
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exit(1);
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}
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}
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void TriangleAt(GLfloat x, GLfloat y, GLfloat z, BOOL colors)
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{
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glPushMatrix();
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glTranslatef(x, y, z);
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glBegin (GL_TRIANGLES);
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if (colors)
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{
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glColor3f(1.0f, 0.0f, 0.0f);
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}
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glVertex2f (0.0f, 0.0f);
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if (colors)
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{
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glColor3f(0.0f, 1.0f, 0.0f);
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}
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glVertex2f (5.0f, 5.0f);
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if (colors)
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{
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glColor3f(0.0f, 0.0f, 1.0f);
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}
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glVertex2f (0.0f, 5.0f);
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glEnd ();
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glPopMatrix();
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}
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void Test(void)
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{
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HGLRC old_ctx;
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old_ctx = wglGetCurrentContext();
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glColor3f(1.0f, 0.0f, 0.0f);
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TriangleAt(1.0f, 1.0f, 0.0f, FALSE);
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if (!wglCopyContext(old_ctx, ctx2, GL_CURRENT_BIT))
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{
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printf("Unable to copy context\n");
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exit(1);
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}
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wglMakeCurrent(auxGetHDC(), ctx2);
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// Should be red instead of white because current color is copied
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TriangleAt(7.0f, 1.0f, 0.0f, FALSE);
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wglMakeCurrent(auxGetHDC(), old_ctx);
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glEnable(GL_CULL_FACE);
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glCullFace(GL_FRONT);
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glDisable(GL_DITHER);
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// Should be culled
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TriangleAt(13.0f, 1.0f, 0.0f, TRUE);
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if (!wglCopyContext(old_ctx, ctx2, GL_COLOR_BUFFER_BIT))
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{
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printf("Unable to copy context\n");
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exit(1);
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}
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wglMakeCurrent(auxGetHDC(), ctx2);
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// Should be drawn but not dithered since we only copied the
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// color buffer state
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TriangleAt(19.0f, 1.0f, 0.0f, TRUE);
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wglMakeCurrent(auxGetHDC(), old_ctx);
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if (!wglCopyContext(old_ctx, ctx2, GL_POLYGON_BIT))
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{
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printf("Unable to copy context\n");
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exit(1);
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}
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wglMakeCurrent(auxGetHDC(), ctx2);
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// Should be culled now that the culling been copied
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TriangleAt(25.0f, 1.0f, 0.0f, TRUE);
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wglMakeCurrent(auxGetHDC(), old_ctx);
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}
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void display(void)
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{
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glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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Test ();
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glFlush ();
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}
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void myReshape(GLsizei w, GLsizei h)
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{
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HGLRC old_ctx;
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old_ctx = wglGetCurrentContext();
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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if (w <= h)
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gluOrtho2D (0.0, 100.0, 0.0, 100.0 * (GLfloat) h/(GLfloat) w);
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else
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gluOrtho2D (0.0, 100.0 * (GLfloat) w/(GLfloat) h, 0.0, 100.0);
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glMatrixMode(GL_MODELVIEW);
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wglMakeCurrent(auxGetHDC(), ctx2);
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glViewport(0, 0, w, h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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if (w <= h)
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gluOrtho2D (0.0, 100.0, 0.0, 100.0 * (GLfloat) h/(GLfloat) w);
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else
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gluOrtho2D (0.0, 100.0 * (GLfloat) w/(GLfloat) h, 0.0, 100.0);
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glMatrixMode(GL_MODELVIEW);
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wglMakeCurrent(auxGetHDC(), old_ctx);
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}
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/* Main Loop
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* Open window with initial window size, title bar,
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* RGBA display mode, and handle input events.
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*/
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int __cdecl main(int argc, char** argv)
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{
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auxInitDisplayMode (AUX_SINGLE | AUX_RGB | AUX_DEPTH16);
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auxInitPosition (0, 0, 500, 500);
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auxInitWindow ("CopyContext Test");
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Initialize();
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auxReshapeFunc (myReshape);
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auxMainLoop(display);
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return 0;
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}
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