r300: initial user clipping for TCL paths

I've no idea if this code might break something or how it should interact
with vertex shaders, it makes the clip demo work for me

4 files changed, 84 insertions, 1 deletions

diff --git a/src/mesa/drivers/dri/r300/r300_cmdbuf.c b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
index 4e6e3e73d8..203c108012 100644
--- a/src/mesa/drivers/dri/r300/r300_cmdbuf.c
+++ b/src/mesa/drivers/dri/r300/r300_cmdbuf.c
@@ -443,15 +443,24 @@ void r300InitCmdBuf(r300ContextPtr r300)
 
 	/* VPU only on TCL */
 	if (has_tcl) {
+   	        int i;
 		ALLOC_STATE(vpi, vpu, R300_VPI_CMDSIZE, 0);
 		r300->hw.vpi.cmd[R300_VPI_CMD_0] =
 		    cmdvpu(R300_PVS_UPLOAD_PROGRAM, 0);
+
 		ALLOC_STATE(vpp, vpu, R300_VPP_CMDSIZE, 0);
 		r300->hw.vpp.cmd[R300_VPP_CMD_0] =
 		    cmdvpu(R300_PVS_UPLOAD_PARAMETERS, 0);
+
 		ALLOC_STATE(vps, vpu, R300_VPS_CMDSIZE, 0);
 		r300->hw.vps.cmd[R300_VPS_CMD_0] =
 		    cmdvpu(R300_PVS_UPLOAD_POINTSIZE, 1);
+
+		for (i = 0; i < 6; i++) {
+		  ALLOC_STATE(vpucp[i], vpu, R300_VPUCP_CMDSIZE, 0);
+		  r300->hw.vpucp[i].cmd[R300_VPUCP_CMD_0] =
+ 		    cmdvpu(R300_PVS_UPLOAD_CLIP_PLANE0+i, 1);
+		}
 	}
 
 	/* Textures */
diff --git a/src/mesa/drivers/dri/r300/r300_context.h b/src/mesa/drivers/dri/r300/r300_context.h
index be6909724a..f853d08057 100644
--- a/src/mesa/drivers/dri/r300/r300_context.h
+++ b/src/mesa/drivers/dri/r300/r300_context.h
@@ -418,6 +418,13 @@ struct r300_state_atom {
 #define R300_VPP_PARAM_0	1
 #define R300_VPP_CMDSIZE	1025	/* 256 4-component parameters */
 
+#define R300_VPUCP_CMD_0		0
+#define R300_VPUCP_X            1
+#define R300_VPUCP_Y            2
+#define R300_VPUCP_Z            3
+#define R300_VPUCP_W            4
+#define R300_VPUCP_CMDSIZE	5	/* 256 4-component parameters */
+
 #define R300_VPS_CMD_0		0
 #define R300_VPS_ZERO_0		1
 #define R300_VPS_ZERO_1		2
@@ -505,6 +512,7 @@ struct r300_hw_state {
 	struct r300_state_atom vpi;	/* vp instructions */
 	struct r300_state_atom vpp;	/* vp parameters */
 	struct r300_state_atom vps;	/* vertex point size (?) */
+	struct r300_state_atom vpucp[6];	/* vp user clip plane - 6 */
 	/* 8 texture units */
 	/* the state is grouped by function and not by
 	   texture unit. This makes single unit updates
diff --git a/src/mesa/drivers/dri/r300/r300_reg.h b/src/mesa/drivers/dri/r300/r300_reg.h
index 2679c8f100..2e998bc5fe 100644
--- a/src/mesa/drivers/dri/r300/r300_reg.h
+++ b/src/mesa/drivers/dri/r300/r300_reg.h
@@ -293,6 +293,13 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 #       define R300_PVS_UPLOAD_CLIP_PLANE5       0x00000405
 #       define R300_PVS_UPLOAD_POINTSIZE         0x00000406
 
+#       define R500_PVS_UPLOAD_CLIP_PLANE0       0x00000600
+#       define R500_PVS_UPLOAD_CLIP_PLANE1       0x00000601
+#       define R500_PVS_UPLOAD_CLIP_PLANE2       0x00000602
+#       define R500_PVS_UPLOAD_CLIP_PLANE3       0x00000603
+#       define R500_PVS_UPLOAD_CLIP_PLANE4       0x00000604
+#       define R500_PVS_UPLOAD_CLIP_PLANE5       0x00000605
+
 /*
  * These are obsolete defines form r300_context.h, but they might give some
  * clues when investigating the addresses further...
@@ -323,6 +330,7 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 #define R300_VAP_UNKNOWN_221C               0x221C
 #       define R300_221C_NORMAL                  0x00000000
 #       define R300_221C_CLEAR                   0x0001C000
+#define R300_VAP_UCP_ENABLE_0 (1 << 0)
 
 /* These seem to be per-pixel and per-vertex X and Y clipping planes. The first
  * plane is per-pixel and the second plane is per-vertex.
diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index 8a2ebbf959..cd8bcdb47d 100644
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -67,6 +67,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 extern int future_hw_tcl_on;
 extern void _tnl_UpdateFixedFunctionProgram(GLcontext * ctx);
+static void r300ClipPlane( GLcontext *ctx, GLenum plane, const GLfloat *eq );
 
 static void r300BlendColor(GLcontext * ctx, const GLfloat cf[4])
 {
@@ -1665,7 +1666,7 @@ static void r300SetupVertexProgram(r300ContextPtr rmesa)
 static void r300Enable(GLcontext * ctx, GLenum cap, GLboolean state)
 {
 	r300ContextPtr r300 = R300_CONTEXT(ctx);
-
+	GLuint p;
 	if (RADEON_DEBUG & DEBUG_STATE)
 		fprintf(stderr, "%s( %s = %s )\n", __FUNCTION__,
 			_mesa_lookup_enum_by_nr(cap),
@@ -1704,6 +1705,27 @@ static void r300Enable(GLcontext * ctx, GLenum cap, GLboolean state)
 		r300SetBlendState(ctx);
 		break;
 
+		
+	case GL_CLIP_PLANE0:
+	case GL_CLIP_PLANE1:
+	case GL_CLIP_PLANE2:
+	case GL_CLIP_PLANE3:
+	case GL_CLIP_PLANE4:
+	case GL_CLIP_PLANE5:
+		/* no VAP UCP on non-TCL chipsets */
+		if (!(r300->radeon.radeonScreen->chip_flags & RADEON_CHIPSET_TCL))
+			return;
+
+		p = cap-GL_CLIP_PLANE0;
+		R300_STATECHANGE( r300, unk221C );
+		if (state) {
+			r300->hw.unk221C.cmd[1] |= (R300_VAP_UCP_ENABLE_0<<p);
+			r300ClipPlane( ctx, cap, NULL );
+		}
+		else {
+			r300->hw.unk221C.cmd[1] &= ~(R300_VAP_UCP_ENABLE_0<<p);
+		}
+		break;
 	case GL_DEPTH_TEST:
 		r300SetDepthState(ctx);
 		break;
@@ -1739,6 +1761,8 @@ static void r300Enable(GLcontext * ctx, GLenum cap, GLboolean state)
 			r300->hw.occlusion_cntl.cmd[1] &= ~(3 << 0);
 		}
 		break;
+
+
 	default:
 		radeonEnable(ctx, cap, state);
 		return;
@@ -2188,6 +2212,38 @@ static void r300RenderMode(GLcontext * ctx, GLenum mode)
 	(void)mode;
 }
 
+static void r300ClipPlane( GLcontext *ctx, GLenum plane, const GLfloat *eq )
+{
+	r300ContextPtr rmesa = R300_CONTEXT(ctx);
+	GLint p = (GLint) plane - (GLint) GL_CLIP_PLANE0;
+	GLint *ip = (GLint *)ctx->Transform._ClipUserPlane[p];
+
+	R300_STATECHANGE( rmesa, vpucp[p] );
+	rmesa->hw.vpucp[p].cmd[R300_VPUCP_X] = ip[0];
+	rmesa->hw.vpucp[p].cmd[R300_VPUCP_Y] = ip[1];
+	rmesa->hw.vpucp[p].cmd[R300_VPUCP_Z] = ip[2];
+	rmesa->hw.vpucp[p].cmd[R300_VPUCP_W] = ip[3];
+}
+
+
+void r300UpdateClipPlanes( GLcontext *ctx )
+{
+	r300ContextPtr rmesa = R300_CONTEXT(ctx);
+	GLuint p;
+	
+	for (p = 0; p < ctx->Const.MaxClipPlanes; p++) {
+		if (ctx->Transform.ClipPlanesEnabled & (1 << p)) {
+			GLint *ip = (GLint *)ctx->Transform._ClipUserPlane[p];
+			
+			R300_STATECHANGE( rmesa, vpucp[p] );
+			rmesa->hw.vpucp[p].cmd[R300_VPUCP_X] = ip[0];
+			rmesa->hw.vpucp[p].cmd[R300_VPUCP_Y] = ip[1];
+			rmesa->hw.vpucp[p].cmd[R300_VPUCP_Z] = ip[2];
+			rmesa->hw.vpucp[p].cmd[R300_VPUCP_W] = ip[3];
+		}
+	}
+}
+
 /**
  * Initialize driver's state callback functions
  */
@@ -2225,4 +2281,6 @@ void r300InitStateFuncs(struct dd_function_table *functions)
 	functions->PolygonMode = r300PolygonMode;
 
 	functions->RenderMode = r300RenderMode;
+
+	functions->ClipPlane = r300ClipPlane;
 }