Mesa (master): r600: Add support for ARB_depth_clamp

[Alex Deucher]

Module: Mesa
Branch: master
Commit: b924579bd4afaf5daa9df8d4f120f42fa20cafc6
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=b924579bd4afaf5daa9df8d4f120f42fa20cafc6

Author: Alex Deucher <alexdeucher at gmail.com>
Date:   Thu Oct 29 19:42:12 2009 -0400

r600: Add support for ARB_depth_clamp

---

 src/mesa/drivers/dri/r600/r600_context.c |    1 +
 src/mesa/drivers/dri/r600/r700_state.c   |   15 +++++++++++++--
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/src/mesa/drivers/dri/r600/r600_context.c b/src/mesa/drivers/dri/r600/r600_context.c
index 6de151d..dbd2337 100644
--- a/src/mesa/drivers/dri/r600/r600_context.c
+++ b/src/mesa/drivers/dri/r600/r600_context.c
@@ -94,6 +94,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 static const struct dri_extension card_extensions[] = {
   /* *INDENT-OFF* */
+  {"GL_ARB_depth_clamp",                NULL},
   {"GL_ARB_depth_texture",		NULL},
   {"GL_ARB_fragment_program",		NULL},
   {"GL_ARB_occlusion_query",            GL_ARB_occlusion_query_functions},
diff --git a/src/mesa/drivers/dri/r600/r700_state.c b/src/mesa/drivers/dri/r600/r700_state.c
index 2b42bfa..b278887 100644
--- a/src/mesa/drivers/dri/r600/r700_state.c
+++ b/src/mesa/drivers/dri/r600/r700_state.c
@@ -1030,6 +1030,7 @@ static void r700UpdateWindow(GLcontext * ctx, int id) //--------------------
 	GLfloat tz = v[MAT_TZ] * depthScale;
 
 	R600_STATECHANGE(context, vpt);
+	R600_STATECHANGE(context, cl);
 
 	r700->viewport[id].PA_CL_VPORT_XSCALE.f32All  = sx;
 	r700->viewport[id].PA_CL_VPORT_XOFFSET.f32All = tx;
@@ -1040,6 +1041,18 @@ static void r700UpdateWindow(GLcontext * ctx, int id) //--------------------
 	r700->viewport[id].PA_CL_VPORT_ZSCALE.f32All  = sz;
 	r700->viewport[id].PA_CL_VPORT_ZOFFSET.f32All = tz;
 
+	if (ctx->Transform.DepthClamp) {
+		r700->viewport[id].PA_SC_VPORT_ZMIN_0.f32All = MIN2(ctx->Viewport.Near, ctx->Viewport.Far);
+		r700->viewport[id].PA_SC_VPORT_ZMAX_0.f32All = MAX2(ctx->Viewport.Near, ctx->Viewport.Far);
+		SETbit(r700->PA_CL_CLIP_CNTL.u32All, ZCLIP_NEAR_DISABLE_bit);
+		SETbit(r700->PA_CL_CLIP_CNTL.u32All, ZCLIP_FAR_DISABLE_bit);
+	} else {
+		r700->viewport[id].PA_SC_VPORT_ZMIN_0.f32All = 0.0;
+		r700->viewport[id].PA_SC_VPORT_ZMAX_0.f32All = 1.0;
+		CLEARbit(r700->PA_CL_CLIP_CNTL.u32All, ZCLIP_NEAR_DISABLE_bit);
+		CLEARbit(r700->PA_CL_CLIP_CNTL.u32All, ZCLIP_FAR_DISABLE_bit);
+	}
+
 	r700->viewport[id].enabled = GL_TRUE;
 
 	r700SetScissor(context);
@@ -1345,8 +1358,6 @@ void r700SetScissor(context_t *context) //---------------
 	SETfield(r700->viewport[id].PA_SC_VPORT_SCISSOR_0_BR.u32All, y2,
 		 PA_SC_VPORT_SCISSOR_0_BR__BR_Y_shift, PA_SC_VPORT_SCISSOR_0_BR__BR_Y_mask);
 
-	r700->viewport[id].PA_SC_VPORT_ZMIN_0.u32All = 0;
-	r700->viewport[id].PA_SC_VPORT_ZMAX_0.u32All = 0x3F800000;
 	r700->viewport[id].enabled = GL_TRUE;
 }