OpenHarmony/third_party_mesa3d
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glutSwapBuffers implicitly does a glFinish when swapping back to the front

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buffer. We now issue a glFinish when not issuing SwapBuffers to ensure
the pipeline is complete.

(Problem found with Chromium).
This commit is contained in:
Alan Hourihane
2002-05-02 09:15:22 +00:00
parent f595212336
commit 056b35874b
1 changed files with 11 additions and 7 deletions
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18
progs/demos/readpix.c
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@@ -1,4 +1,4 @@
/* $Id: readpix.c,v 1.5 2002/04/22 16:03:37 brianp Exp $ */
/* $Id: readpix.c,v 1.6 2002/05/02 09:15:22 alanh Exp $ */
/*
* glReadPixels and glCopyPixels test
@@ -34,7 +34,7 @@ static GLubyte *TempImage = NULL;
#define ReadType GL_UNSIGNED_BYTE
#endif
#if 1
static GLenum ReadFormat = GL_RGBA;
static GLenum ReadFormat = GL_DEPTH_COMPONENT; /*GL_RGBA; */
static GLenum ReadType = GL_UNSIGNED_BYTE;
#endif
#if 0
@@ -111,6 +111,8 @@ Display( void )
glRasterPos2i(APosX, APosY);
glEnable(GL_DITHER);
SetupPixelTransfer(GL_FALSE);
glDrawBuffer(GL_AUX0);
glReadBuffer(GL_AUX0);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
/* do readpixels, drawpixels */
@@ -152,10 +154,12 @@ Display( void )
glRasterPos2i(CPosX, CPosY);
glDisable(GL_DITHER);
SetupPixelTransfer(ScaleAndBias);
glCopyPixels(APosX, APosY, ImgWidth, ImgHeight, GL_COLOR);
glCopyPixels(APosX, APosY, ImgWidth, ImgHeight, GL_DEPTH);
if (!DrawFront)
glutSwapBuffers();
else
glFinish();
}
@@ -186,12 +190,12 @@ Key( unsigned char key, int x, int y )
case 'f':
DrawFront = !DrawFront;
if (DrawFront) {
glDrawBuffer(GL_FRONT);
glReadBuffer(GL_FRONT);
glDrawBuffer(GL_AUX0);
glReadBuffer(GL_AUX0);
}
else {
glDrawBuffer(GL_BACK);
glReadBuffer(GL_BACK);
glDrawBuffer(GL_AUX0);
glReadBuffer(GL_AUX0);
}
printf("glDrawBuffer(%s)\n", DrawFront ? "GL_FRONT" : "GL_BACK");
break;