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add driClipRectToFramebuffer helper function

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This commit is contained in:
Keith Whitwell 2003-12-11 19:06:32 +00:00
parent 844cdaf461
commit 7ed58285ab
2 changed files with 37 additions and 0 deletions
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33
src/mesa/drivers/dri/common/utils.c
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@ -184,3 +184,36 @@ driCheckDriDdxDrmVersions(__DRIscreenPrivate *sPriv,
return GL_TRUE;
}
GLboolean driClipRectToFramebuffer( const GLframebuffer *buffer,
GLint *x, GLint *y,
GLsizei *width, GLsizei *height )
{
/* left clipping */
if (*x < buffer->_Xmin) {
*width -= (buffer->_Xmin - *x);
*x = buffer->_Xmin;
}
/* right clipping */
if (*x + *width > buffer->_Xmax)
*width -= (*x + *width - buffer->_Xmax - 1);
if (*width <= 0)
return GL_FALSE;
/* bottom clipping */
if (*y < buffer->_Ymin) {
*height -= (buffer->_Ymin - *y);
*y = buffer->_Ymin;
}
/* top clipping */
if (*y + *height > buffer->_Ymax)
*height -= (*y + *height - buffer->_Ymax - 1);
if (*height <= 0)
return GL_FALSE;
return GL_TRUE;
}

4
src/mesa/drivers/dri/common/utils.h
View file

@ -51,4 +51,8 @@ extern GLboolean driCheckDriDdxDrmVersions( __DRIscreenPrivate *sPriv,
const char * driver_name, int dri_major, int dri_minor,
int ddx_major, int ddx_minor, int drm_major, int drm_minor );
extern GLboolean driClipRectToFramebuffer( const GLframebuffer *buffer,
GLint *x, GLint *y,
GLsizei *width, GLsizei *height );
#endif /* DRI_DEBUG_H */