add missing glViewport calls

cherry-picked from master

diff --git a/progs/util/showbuffer.c b/progs/util/showbuffer.c
index 17f84dc62bdb9391d78023cd53057caaa89f49cf..b0cedea217c3dba90cde374c241023cbc1016951 100644 (file)
--- a/progs/util/showbuffer.c
+++ b/progs/util/showbuffer.c
@@ -71,6 +71,8 @@ ShowDepthBuffer( GLsizei winWidth, GLsizei winHeight,
    glPushMatrix();
    glLoadIdentity();
 
+   glViewport(0, 0, winWidth, winHeight);
+
    glDisable(GL_STENCIL_TEST);
    glDisable(GL_DEPTH_TEST);
    glRasterPos2f(0, 0);
@@ -120,6 +122,8 @@ ShowAlphaBuffer( GLsizei winWidth, GLsizei winHeight )
    glPushMatrix();
    glLoadIdentity();
 
+   glViewport(0, 0, winWidth, winHeight);
+
    glDisable(GL_STENCIL_TEST);
    glDisable(GL_DEPTH_TEST);
    glRasterPos2f(0, 0);
@@ -170,6 +174,8 @@ ShowStencilBuffer( GLsizei winWidth, GLsizei winHeight,
    glPushMatrix();
    glLoadIdentity();
 
+   glViewport(0, 0, winWidth, winHeight);
+
    glDisable(GL_STENCIL_TEST);
    glDisable(GL_DEPTH_TEST);
    glRasterPos2f(0, 0);