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progs/tests: fixes for drawbuffers.c

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Disable GL_DEPTH_TEST before glDrawPixels.
Show color buffer 0 on left, color buffer 1 on right.
This commit is contained in:
Brian Paul
2009-10-29 14:46:02 -06:00
parent 635ea87374
commit 02b9fb9c80
1 changed files with 12 additions and 5 deletions
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17
progs/tests/drawbuffers.c
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@@ -43,6 +43,8 @@ Display(void)
glUseProgram_func(Program); glUseProgram_func(Program);
glEnable(GL_DEPTH_TEST);
/* draw to user framebuffer */ /* draw to user framebuffer */
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, FBobject); glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, FBobject);
@@ -68,18 +70,23 @@ Display(void)
glPopMatrix(); glPopMatrix();
/* read from user framebuffer */ /* read from user framebuffer */
/* bottom half = colorbuffer 0 */ /* left half = colorbuffer 0 */
glReadBuffer(GL_COLOR_ATTACHMENT0_EXT); glReadBuffer(GL_COLOR_ATTACHMENT0_EXT);
glReadPixels(0, 0, Width, Height / 2, GL_RGBA, GL_UNSIGNED_BYTE, glPixelStorei(GL_PACK_ROW_LENGTH, Width);
glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
glReadPixels(0, 0, Width / 2, Height, GL_RGBA, GL_UNSIGNED_BYTE,
buffer); buffer);
/* top half = colorbuffer 1 */
/* right half = colorbuffer 1 */
glReadBuffer(GL_COLOR_ATTACHMENT1_EXT); glReadBuffer(GL_COLOR_ATTACHMENT1_EXT);
glReadPixels(0, Height/2, Width, Height - Height / 2, glPixelStorei(GL_PACK_SKIP_PIXELS, Width / 2);
glReadPixels(Width / 2, 0, Width - Width / 2, Height,
GL_RGBA, GL_UNSIGNED_BYTE, GL_RGBA, GL_UNSIGNED_BYTE,
buffer + Width * (Height / 2) * 4); buffer);
/* draw to window */ /* draw to window */
glUseProgram_func(0); glUseProgram_func(0);
glDisable(GL_DEPTH_TEST);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0); glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
glWindowPos2iARB(0, 0); glWindowPos2iARB(0, 0);
glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer); glDrawPixels(Width, Height, GL_RGBA, GL_UNSIGNED_BYTE, buffer);