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authorBrian Paul <brianp@vmware.com>2010-03-15 18:19:04 -0600
committerBrian Paul <brianp@vmware.com>2010-03-15 18:19:04 -0600
commitcb1b0b4bec9a1c05bbb762ed04a78dfdf584e3a6 (patch)
tree8d7883a4c444e08ba1fb47632b8efb1f02008313
parent185be3a87a5b38e8821a560c073975c11dcbd3e9 (diff)
gallivm: checkpoint: stencil test code
-rw-r--r--src/gallium/auxiliary/gallivm/lp_bld_depth.c106
1 files changed, 105 insertions, 1 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_depth.c b/src/gallium/auxiliary/gallivm/lp_bld_depth.c
index 829cffea4c..cbc48f9865 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_depth.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_depth.c
@@ -61,11 +61,104 @@
#include "util/u_format.h"
#include "lp_bld_type.h"
+#include "lp_bld_arit.h"
#include "lp_bld_const.h"
#include "lp_bld_logic.h"
#include "lp_bld_flow.h"
#include "lp_bld_debug.h"
#include "lp_bld_depth.h"
+#include "lp_bld_swizzle.h"
+
+
+
+/**
+ * Do the stencil test comparison (compare fb Z values against ref value.
+ * \param stencilVals vector of stencil values from framebuffer
+ * \param stencilRef the stencil reference value, replicated as a vector
+ * \return mask of pass/fail values
+ */
+static LLVMValueRef
+lp_build_stencil_test(struct lp_build_context *bld,
+ const struct pipe_stencil_state *stencil,
+ LLVMValueRef stencilVals,
+ LLVMValueRef stencilRef)
+{
+ const unsigned stencilMax = 255; /* XXX fix */
+ struct lp_type type = bld->type;
+ LLVMValueRef res;
+
+ assert(stencil->enabled);
+
+ if (stencil->valuemask != stencilMax) {
+ /* compute stencilRef = stencilRef & valuemask */
+ LLVMValueRef valuemask = lp_build_const_int_vec(type, stencil->valuemask);
+ stencilRef = LLVMBuildAnd(bld->builder, stencilRef, valuemask, "");
+ /* compute stencilVals = stencilVals & valuemask */
+ stencilVals = LLVMBuildAnd(bld->builder, stencilVals, valuemask, "");
+ }
+
+ res = lp_build_compare(bld->builder, bld->type, stencil->func,
+ stencilVals, stencilRef);
+
+ return res;
+}
+
+
+/**
+ * Apply the stencil operator (add/sub/keep/etc) to the given vector
+ * of stencil values.
+ * \return new stencil values vector
+ */
+static LLVMValueRef
+lp_build_stencil_op(struct lp_build_context *bld,
+ unsigned stencil_op,
+ LLVMValueRef stencilRef,
+ const struct pipe_stencil_state *stencil,
+ LLVMValueRef stencilVals)
+
+{
+ const unsigned stencilMax = 255; /* XXX fix */
+ struct lp_type type = bld->type;
+ LLVMValueRef res;
+ LLVMValueRef max = lp_build_const_int_vec(type, stencilMax);
+
+ switch (stencil_op) {
+ case PIPE_STENCIL_OP_KEEP:
+ res = stencilVals;
+ case PIPE_STENCIL_OP_ZERO:
+ res = bld->zero;
+ case PIPE_STENCIL_OP_REPLACE:
+ res = lp_build_broadcast_scalar(bld, stencilRef);
+ case PIPE_STENCIL_OP_INCR:
+ res = lp_build_add(bld, stencilVals, bld->one);
+ res = lp_build_min(bld, res, max);
+ case PIPE_STENCIL_OP_DECR:
+ res = lp_build_sub(bld, stencilVals, bld->one);
+ res = lp_build_max(bld, res, bld->zero);
+ case PIPE_STENCIL_OP_INCR_WRAP:
+ res = lp_build_add(bld, stencilVals, bld->one);
+ res = LLVMBuildAnd(bld->builder, res, max, "");
+ case PIPE_STENCIL_OP_DECR_WRAP:
+ res = lp_build_sub(bld, stencilVals, bld->one);
+ res = LLVMBuildAnd(bld->builder, res, max, "");
+ case PIPE_STENCIL_OP_INVERT:
+ res = LLVMBuildNot(bld->builder, stencilVals, "");
+ default:
+ assert(0 && "bad stencil op mode");
+ res = NULL;
+ }
+
+ if (stencil->writemask != stencilMax) {
+ /* compute res = (res & mask) | (stencilVals & ~mask) */
+ LLVMValueRef mask = lp_build_const_int_vec(type, stencil->writemask);
+ LLVMValueRef cmask = LLVMBuildNot(bld->builder, mask, "notWritemask");
+ LLVMValueRef t1 = LLVMBuildAnd(bld->builder, res, mask, "t1");
+ LLVMValueRef t2 = LLVMBuildAnd(bld->builder, stencilVals, cmask, "t2");
+ res = LLVMBuildOr(bld->builder, t1, t2, "t1_or_t2");
+ }
+
+ return res;
+}
/**
@@ -109,7 +202,14 @@ lp_depth_type(const struct util_format_description *format_desc,
/**
- * Depth test.
+ * Generate code for performing depth and/or stencil tests.
+ * We operate on a vector of values (typically a 2x2 quad).
+ *
+ * \param type the data type of the fragment depth/stencil values
+ * \param format_desc description of the depth/stencil surface
+ * \param mask the alive/dead pixel mask for the quad
+ * \param src the incoming depth/stencil values (a 2x2 quad)
+ * \param dst_ptr the outgoing/updated depth/stencil values
*/
void
lp_build_depth_test(LLVMBuilderRef builder,
@@ -126,6 +226,9 @@ lp_build_depth_test(LLVMBuilderRef builder,
LLVMValueRef z_bitmask = NULL;
LLVMValueRef test;
+ (void) lp_build_stencil_test;
+ (void) lp_build_stencil_op;
+
if(!state->enabled)
return;
@@ -198,6 +301,7 @@ lp_build_depth_test(LLVMBuilderRef builder,
lp_build_name(dst, "zsbuf.z");
+ /* compare src Z to dst Z, returning 'pass' mask */
test = lp_build_cmp(&bld, state->func, src, dst);
lp_build_mask_update(mask, test);