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authorKeith Whitwell <keith@tungstengraphics.com>2003-12-11 19:06:32 +0000
committerKeith Whitwell <keith@tungstengraphics.com>2003-12-11 19:06:32 +0000
commit7ed58285abede813fbf5fa0a2e29982043f1bbbe (patch)
treea1b7dc8b8464aae4ac8a445ac7fffe4b49d90843
parent844cdaf461e3e181bcf1d4c0ba79ef5c4140cb4e (diff)
add driClipRectToFramebuffer helper function
-rw-r--r--src/mesa/drivers/dri/common/utils.c33
-rw-r--r--src/mesa/drivers/dri/common/utils.h4
2 files changed, 37 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/common/utils.c b/src/mesa/drivers/dri/common/utils.c
index 0d21ceda562..4276854224d 100644
--- a/src/mesa/drivers/dri/common/utils.c
+++ b/src/mesa/drivers/dri/common/utils.c
@@ -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;
+}
diff --git a/src/mesa/drivers/dri/common/utils.h b/src/mesa/drivers/dri/common/utils.h
index d6506c5b88c..401a1b882f5 100644
--- a/src/mesa/drivers/dri/common/utils.h
+++ b/src/mesa/drivers/dri/common/utils.h
@@ -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 */