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-rw-r--r--src/mesa/swrast/s_depth.c22
-rw-r--r--src/mesa/swrast/swrast.h7
2 files changed, 28 insertions, 1 deletions
diff --git a/src/mesa/swrast/s_depth.c b/src/mesa/swrast/s_depth.c
index fc242be2aa..34897ba931 100644
--- a/src/mesa/swrast/s_depth.c
+++ b/src/mesa/swrast/s_depth.c
@@ -1665,13 +1665,33 @@ _swrast_alloc_depth_buffer( GLframebuffer *buffer )
void
_swrast_clear_depth_buffer( GLcontext *ctx )
{
+ SWcontext *swrast = SWRAST_CONTEXT(ctx);
+
if (ctx->Visual.depthBits == 0
- || !ctx->DrawBuffer->DepthBuffer
|| !ctx->Depth.Mask) {
/* no depth buffer, or writing to it is disabled */
return;
}
+ if (swrast->Driver.WriteMonoDepthSpan) {
+ const GLdepth clearValue = (GLdepth)(ctx->Depth.Clear * ctx->DepthMax);
+ const GLint x = ctx->DrawBuffer->_Xmin;
+ const GLint y = ctx->DrawBuffer->_Ymin;
+ const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
+ const GLint width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
+ GLint i;
+
+ for (i = 0; i < height; i++) {
+ (*swrast->Driver.WriteMonoDepthSpan)( ctx, width, x, y + i,
+ clearValue, NULL );
+ }
+
+ return;
+ }
+
+ if (!ctx->DrawBuffer->DepthBuffer)
+ return;
+
/* The loops in this function have been written so the IRIX 5.3
* C compiler can unroll them. Hopefully other compilers can too!
*/
diff --git a/src/mesa/swrast/swrast.h b/src/mesa/swrast/swrast.h
index 9447e99880..7fb0d2a389 100644
--- a/src/mesa/swrast/swrast.h
+++ b/src/mesa/swrast/swrast.h
@@ -403,6 +403,13 @@ struct swrast_device_driver {
* depth[i] value if mask[i] is nonzero.
*/
+ void (*WriteMonoDepthSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
+ const GLdepth depth, const GLubyte mask[] );
+ /* Write a horizontal run of depth values.
+ * If mask is NULL, draw all pixels.
+ * If mask is not null, only draw pixel [i] when mask [i] is true.
+ */
+
void (*ReadDepthSpan)( GLcontext *ctx, GLuint n, GLint x, GLint y,
GLdepth depth[] );
/* Read a horizontal span of values from the depth buffer.