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 * glReadPixels and glCopyPixels test
@@ -34,7 +34,7 @@ static GLubyte *TempImage = NULL;
#define ReadType GL_UNSIGNED_BYTE #define ReadType GL_UNSIGNED_BYTE
#endif #endif
#if 1 #if 1
static GLenum ReadFormat = GL_RGBA; static GLenum ReadFormat = GL_DEPTH_COMPONENT; /*GL_RGBA; */
static GLenum ReadType = GL_UNSIGNED_BYTE; static GLenum ReadType = GL_UNSIGNED_BYTE;
#endif #endif
#if 0 #if 0
@@ -111,6 +111,8 @@ Display( void )
glRasterPos2i(APosX, APosY); glRasterPos2i(APosX, APosY);
glEnable(GL_DITHER); glEnable(GL_DITHER);
SetupPixelTransfer(GL_FALSE); SetupPixelTransfer(GL_FALSE);
glDrawBuffer(GL_AUX0);
glReadBuffer(GL_AUX0);
glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image); glDrawPixels(ImgWidth, ImgHeight, ImgFormat, GL_UNSIGNED_BYTE, Image);
/* do readpixels, drawpixels */ /* do readpixels, drawpixels */
@@ -152,10 +154,12 @@ Display( void )
glRasterPos2i(CPosX, CPosY); glRasterPos2i(CPosX, CPosY);
glDisable(GL_DITHER); glDisable(GL_DITHER);
SetupPixelTransfer(ScaleAndBias); SetupPixelTransfer(ScaleAndBias);
glCopyPixels(APosX, APosY, ImgWidth, ImgHeight, GL_COLOR); glCopyPixels(APosX, APosY, ImgWidth, ImgHeight, GL_DEPTH);
if (!DrawFront) if (!DrawFront)
glutSwapBuffers(); glutSwapBuffers();
else
glFinish();
} }
@@ -186,12 +190,12 @@ Key( unsigned char key, int x, int y )
case 'f': case 'f':
DrawFront = !DrawFront; DrawFront = !DrawFront;
if (DrawFront) { if (DrawFront) {
glDrawBuffer(GL_FRONT); glDrawBuffer(GL_AUX0);
glReadBuffer(GL_FRONT); glReadBuffer(GL_AUX0);
} }
else { else {
glDrawBuffer(GL_BACK); glDrawBuffer(GL_AUX0);
glReadBuffer(GL_BACK); glReadBuffer(GL_AUX0);
} }
printf("glDrawBuffer(%s)\n", DrawFront ? "GL_FRONT" : "GL_BACK"); printf("glDrawBuffer(%s)\n", DrawFront ? "GL_FRONT" : "GL_BACK");
break; break;