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mesa: clear the unused upper-left region to black instead of leaving it undefined

This commit is contained in:
Brian Paul 2008-08-13 08:46:35 -06:00
parent f911ca0834
commit 60b92129b1
1 changed files with 11 additions and 5 deletions
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16
progs/demos/gearbox.c
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@ -264,38 +264,44 @@ draw(void)
glLoadIdentity();
glTranslatef(0.0, 0.0, -40.0);
/* clear whole depth buffer */
glDisable(GL_SCISSOR_TEST);
glClear(GL_DEPTH_BUFFER_BIT);
glEnable(GL_SCISSOR_TEST);
/* draw gears */
/* clear upper-left corner of color buffer (unused space) */
glScissor(0, TexHeight, TexWidth, WinHeight - TexHeight);
glClearColor(0.0, 0.0, 0.0, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
/* clear lower-left corner of color buffer */
glViewport(0, 0, TexWidth, TexHeight);
glScissor(0, 0, TexWidth, TexHeight);
glClearColor(0.5, 0.5, 0.8, 0.0);
glClearColor(1, 1, 1, 0);
glClear(GL_COLOR_BUFFER_BIT);
/* draw gears in lower-left corner */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 60.0);
glMatrixMode(GL_MODELVIEW);
DrawGears();
/* copy color buffer to texture */
glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, TexWidth, TexHeight);
/* draw textured cube */
/* clear right half of color buffer */
glViewport(TexWidth, 0, WinWidth - TexWidth, WinHeight);
glScissor(TexWidth, 0, WinWidth - TexWidth, WinHeight);
glClearColor(0.5, 0.5, 0.8, 0.0);
glClear(GL_COLOR_BUFFER_BIT);
/* draw textured cube in right half of window */
ar = (float) (WinWidth - TexWidth) / WinHeight;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-ar, ar, -1.0, 1.0, 5.0, 60.0);
glMatrixMode(GL_MODELVIEW);
DrawCube();
/* finish up */