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authorDave Airlie <airlied@redhat.com>2015-07-17 04:44:18 +0100
committerDave Airlie <airlied@redhat.com>2015-07-28 22:13:27 +0100
commitaa25a2c1ba2ea14efdab405707f15dace323cd48 (patch)
tree989eb813ad5469ba466665e6e2a64311bd5c51fc
parent56f1f47eda881d6281e9c7531bc17e72b25d9bb9 (diff)
radeonsi: add support for interpolateAt functions (v2)
This is part of ARB_gpu_shader5, and this passes all the piglit tests currently available. v2: use macros from the fine derivs commit. add comments. Reviewed-by: Marek Olšák <marek.olsak@amd.com> Signed-off-by: Dave Airlie <airlied@redhat.com>
-rw-r--r--docs/GL3.txt2
-rw-r--r--src/gallium/drivers/radeonsi/si_shader.c241
2 files changed, 241 insertions, 2 deletions
diff --git a/docs/GL3.txt b/docs/GL3.txt
index 15bb57f441a..258a6fb94e2 100644
--- a/docs/GL3.txt
+++ b/docs/GL3.txt
@@ -107,7 +107,7 @@ GL 4.0, GLSL 4.00:
- Geometry shader instancing DONE (r600, radeonsi, llvmpipe, softpipe)
- Geometry shader multiple streams DONE ()
- Enhanced per-sample shading DONE (r600, radeonsi)
- - Interpolation functions DONE (r600)
+ - Interpolation functions DONE (r600, radeonsi)
- New overload resolution rules DONE
GL_ARB_gpu_shader_fp64 DONE (nvc0, radeonsi, llvmpipe, softpipe)
GL_ARB_sample_shading DONE (i965, nv50, nvc0, r600, radeonsi)
diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index 27b3c72d1c9..fa31f734ff2 100644
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -2960,6 +2960,234 @@ static void si_llvm_emit_ddxy(
emit_data->output[0] = lp_build_gather_values(gallivm, result, 4);
}
+/*
+ * this takes an I,J coordinate pair,
+ * and works out the X and Y derivatives.
+ * it returns DDX(I), DDX(J), DDY(I), DDY(J).
+ */
+static LLVMValueRef si_llvm_emit_ddxy_interp(
+ struct lp_build_tgsi_context *bld_base,
+ LLVMValueRef interp_ij)
+{
+ struct si_shader_context *si_shader_ctx = si_shader_context(bld_base);
+ struct gallivm_state *gallivm = bld_base->base.gallivm;
+ struct lp_build_context *base = &bld_base->base;
+ LLVMValueRef indices[2];
+ LLVMValueRef store_ptr, load_ptr_x, load_ptr_y, load_ptr_ddx, load_ptr_ddy, temp, temp2;
+ LLVMValueRef tl, tr, bl, result[4];
+ LLVMTypeRef i32;
+ unsigned c;
+
+ i32 = LLVMInt32TypeInContext(gallivm->context);
+
+ indices[0] = bld_base->uint_bld.zero;
+ indices[1] = build_intrinsic(gallivm->builder, "llvm.SI.tid", i32,
+ NULL, 0, LLVMReadNoneAttribute);
+ store_ptr = LLVMBuildGEP(gallivm->builder, si_shader_ctx->lds,
+ indices, 2, "");
+
+ temp = LLVMBuildAnd(gallivm->builder, indices[1],
+ lp_build_const_int32(gallivm, TID_MASK_LEFT), "");
+
+ temp2 = LLVMBuildAnd(gallivm->builder, indices[1],
+ lp_build_const_int32(gallivm, TID_MASK_TOP), "");
+
+ indices[1] = temp;
+ load_ptr_x = LLVMBuildGEP(gallivm->builder, si_shader_ctx->lds,
+ indices, 2, "");
+
+ indices[1] = temp2;
+ load_ptr_y = LLVMBuildGEP(gallivm->builder, si_shader_ctx->lds,
+ indices, 2, "");
+
+ indices[1] = LLVMBuildAdd(gallivm->builder, temp,
+ lp_build_const_int32(gallivm, 1), "");
+ load_ptr_ddx = LLVMBuildGEP(gallivm->builder, si_shader_ctx->lds,
+ indices, 2, "");
+
+ indices[1] = LLVMBuildAdd(gallivm->builder, temp2,
+ lp_build_const_int32(gallivm, 2), "");
+ load_ptr_ddy = LLVMBuildGEP(gallivm->builder, si_shader_ctx->lds,
+ indices, 2, "");
+
+ for (c = 0; c < 2; ++c) {
+ LLVMValueRef store_val;
+ LLVMValueRef c_ll = lp_build_const_int32(gallivm, c);
+
+ store_val = LLVMBuildExtractElement(gallivm->builder,
+ interp_ij, c_ll, "");
+ LLVMBuildStore(gallivm->builder,
+ store_val,
+ store_ptr);
+
+ tl = LLVMBuildLoad(gallivm->builder, load_ptr_x, "");
+ tl = LLVMBuildBitCast(gallivm->builder, tl, base->elem_type, "");
+
+ tr = LLVMBuildLoad(gallivm->builder, load_ptr_ddx, "");
+ tr = LLVMBuildBitCast(gallivm->builder, tr, base->elem_type, "");
+
+ result[c] = LLVMBuildFSub(gallivm->builder, tr, tl, "");
+
+ tl = LLVMBuildLoad(gallivm->builder, load_ptr_y, "");
+ tl = LLVMBuildBitCast(gallivm->builder, tl, base->elem_type, "");
+
+ bl = LLVMBuildLoad(gallivm->builder, load_ptr_ddy, "");
+ bl = LLVMBuildBitCast(gallivm->builder, bl, base->elem_type, "");
+
+ result[c + 2] = LLVMBuildFSub(gallivm->builder, bl, tl, "");
+ }
+
+ return lp_build_gather_values(gallivm, result, 4);
+}
+
+static void interp_fetch_args(
+ struct lp_build_tgsi_context *bld_base,
+ struct lp_build_emit_data *emit_data)
+{
+ struct si_shader_context *si_shader_ctx = si_shader_context(bld_base);
+ struct gallivm_state *gallivm = bld_base->base.gallivm;
+ const struct tgsi_full_instruction *inst = emit_data->inst;
+
+ if (inst->Instruction.Opcode == TGSI_OPCODE_INTERP_OFFSET) {
+ /* offset is in second src, first two channels */
+ emit_data->args[0] = lp_build_emit_fetch(bld_base,
+ emit_data->inst, 1,
+ 0);
+ emit_data->args[1] = lp_build_emit_fetch(bld_base,
+ emit_data->inst, 1,
+ 1);
+ emit_data->arg_count = 2;
+ } else if (inst->Instruction.Opcode == TGSI_OPCODE_INTERP_SAMPLE) {
+ LLVMValueRef sample_position;
+ LLVMValueRef sample_id;
+ LLVMValueRef halfval = lp_build_const_float(gallivm, 0.5f);
+
+ /* fetch sample ID, then fetch its sample position,
+ * and place into first two channels.
+ */
+ sample_id = lp_build_emit_fetch(bld_base,
+ emit_data->inst, 1, 0);
+ sample_id = LLVMBuildBitCast(gallivm->builder, sample_id,
+ LLVMInt32TypeInContext(gallivm->context),
+ "");
+ sample_position = load_sample_position(&si_shader_ctx->radeon_bld, sample_id);
+
+ emit_data->args[0] = LLVMBuildExtractElement(gallivm->builder,
+ sample_position,
+ lp_build_const_int32(gallivm, 0), "");
+
+ emit_data->args[0] = LLVMBuildFSub(gallivm->builder, emit_data->args[0], halfval, "");
+ emit_data->args[1] = LLVMBuildExtractElement(gallivm->builder,
+ sample_position,
+ lp_build_const_int32(gallivm, 1), "");
+ emit_data->args[1] = LLVMBuildFSub(gallivm->builder, emit_data->args[1], halfval, "");
+ emit_data->arg_count = 2;
+ }
+}
+
+static void build_interp_intrinsic(const struct lp_build_tgsi_action *action,
+ struct lp_build_tgsi_context *bld_base,
+ struct lp_build_emit_data *emit_data)
+{
+ struct si_shader_context *si_shader_ctx = si_shader_context(bld_base);
+ struct si_shader *shader = si_shader_ctx->shader;
+ struct gallivm_state *gallivm = bld_base->base.gallivm;
+ LLVMValueRef interp_param;
+ const struct tgsi_full_instruction *inst = emit_data->inst;
+ const char *intr_name;
+ int input_index;
+ int chan;
+ int i;
+ LLVMValueRef attr_number;
+ LLVMTypeRef input_type = LLVMFloatTypeInContext(gallivm->context);
+ LLVMValueRef params = LLVMGetParam(si_shader_ctx->radeon_bld.main_fn, SI_PARAM_PRIM_MASK);
+ int interp_param_idx;
+ unsigned location;
+
+ assert(inst->Src[0].Register.File == TGSI_FILE_INPUT);
+ input_index = inst->Src[0].Register.Index;
+
+ if (inst->Instruction.Opcode == TGSI_OPCODE_INTERP_OFFSET ||
+ inst->Instruction.Opcode == TGSI_OPCODE_INTERP_SAMPLE)
+ location = TGSI_INTERPOLATE_LOC_CENTER;
+ else
+ location = TGSI_INTERPOLATE_LOC_CENTROID;
+
+ interp_param_idx = lookup_interp_param_index(shader->ps_input_interpolate[input_index],
+ location);
+ if (interp_param_idx == -1)
+ return;
+ else if (interp_param_idx)
+ interp_param = LLVMGetParam(si_shader_ctx->radeon_bld.main_fn, interp_param_idx);
+ else
+ interp_param = NULL;
+
+ attr_number = lp_build_const_int32(gallivm,
+ shader->ps_input_param_offset[input_index]);
+
+ if (inst->Instruction.Opcode == TGSI_OPCODE_INTERP_OFFSET ||
+ inst->Instruction.Opcode == TGSI_OPCODE_INTERP_SAMPLE) {
+ LLVMValueRef ij_out[2];
+ LLVMValueRef ddxy_out = si_llvm_emit_ddxy_interp(bld_base, interp_param);
+
+ /*
+ * take the I then J parameters, and the DDX/Y for it, and
+ * calculate the IJ inputs for the interpolator.
+ * temp1 = ddx * offset/sample.x + I;
+ * interp_param.I = ddy * offset/sample.y + temp1;
+ * temp1 = ddx * offset/sample.x + J;
+ * interp_param.J = ddy * offset/sample.y + temp1;
+ */
+ for (i = 0; i < 2; i++) {
+ LLVMValueRef ix_ll = lp_build_const_int32(gallivm, i);
+ LLVMValueRef iy_ll = lp_build_const_int32(gallivm, i + 2);
+ LLVMValueRef ddx_el = LLVMBuildExtractElement(gallivm->builder,
+ ddxy_out, ix_ll, "");
+ LLVMValueRef ddy_el = LLVMBuildExtractElement(gallivm->builder,
+ ddxy_out, iy_ll, "");
+ LLVMValueRef interp_el = LLVMBuildExtractElement(gallivm->builder,
+ interp_param, ix_ll, "");
+ LLVMValueRef temp1, temp2;
+
+ interp_el = LLVMBuildBitCast(gallivm->builder, interp_el,
+ LLVMFloatTypeInContext(gallivm->context), "");
+
+ temp1 = LLVMBuildFMul(gallivm->builder, ddx_el, emit_data->args[0], "");
+
+ temp1 = LLVMBuildFAdd(gallivm->builder, temp1, interp_el, "");
+
+ temp2 = LLVMBuildFMul(gallivm->builder, ddy_el, emit_data->args[1], "");
+
+ temp2 = LLVMBuildFAdd(gallivm->builder, temp2, temp1, "");
+
+ ij_out[i] = LLVMBuildBitCast(gallivm->builder,
+ temp2,
+ LLVMIntTypeInContext(gallivm->context, 32), "");
+ }
+ interp_param = lp_build_gather_values(bld_base->base.gallivm, ij_out, 2);
+ }
+
+ intr_name = interp_param ? "llvm.SI.fs.interp" : "llvm.SI.fs.constant";
+ for (chan = 0; chan < 2; chan++) {
+ LLVMValueRef args[4];
+ LLVMValueRef llvm_chan;
+ unsigned schan;
+
+ schan = tgsi_util_get_full_src_register_swizzle(&inst->Src[0], chan);
+ llvm_chan = lp_build_const_int32(gallivm, schan);
+
+ args[0] = llvm_chan;
+ args[1] = attr_number;
+ args[2] = params;
+ args[3] = interp_param;
+
+ emit_data->output[chan] =
+ build_intrinsic(gallivm->builder, intr_name,
+ input_type, args, args[3] ? 4 : 3,
+ LLVMReadNoneAttribute | LLVMNoUnwindAttribute);
+ }
+}
+
/* Emit one vertex from the geometry shader */
static void si_llvm_emit_vertex(
const struct lp_build_tgsi_action *action,
@@ -3073,6 +3301,11 @@ static const struct lp_build_tgsi_action txq_action = {
.intr_name = "llvm.SI.resinfo"
};
+static const struct lp_build_tgsi_action interp_action = {
+ .fetch_args = interp_fetch_args,
+ .emit = build_interp_intrinsic,
+};
+
static void create_meta_data(struct si_shader_context *si_shader_ctx)
{
struct gallivm_state *gallivm = si_shader_ctx->radeon_bld.soa.bld_base.base.gallivm;
@@ -3269,7 +3502,9 @@ static void create_function(struct si_shader_context *si_shader_ctx)
(bld_base->info->opcode_count[TGSI_OPCODE_DDX] > 0 ||
bld_base->info->opcode_count[TGSI_OPCODE_DDY] > 0 ||
bld_base->info->opcode_count[TGSI_OPCODE_DDX_FINE] > 0 ||
- bld_base->info->opcode_count[TGSI_OPCODE_DDY_FINE] > 0))
+ bld_base->info->opcode_count[TGSI_OPCODE_DDY_FINE] > 0 ||
+ bld_base->info->opcode_count[TGSI_OPCODE_INTERP_OFFSET] > 0 ||
+ bld_base->info->opcode_count[TGSI_OPCODE_INTERP_SAMPLE] > 0))
si_shader_ctx->lds =
LLVMAddGlobalInAddressSpace(gallivm->module,
LLVMArrayType(i32, 64),
@@ -3747,6 +3982,10 @@ int si_shader_create(struct si_screen *sscreen, LLVMTargetMachineRef tm,
bld_base->info = poly_stipple ? &stipple_shader_info : &sel->info;
bld_base->emit_fetch_funcs[TGSI_FILE_CONSTANT] = fetch_constant;
+ bld_base->op_actions[TGSI_OPCODE_INTERP_CENTROID] = interp_action;
+ bld_base->op_actions[TGSI_OPCODE_INTERP_SAMPLE] = interp_action;
+ bld_base->op_actions[TGSI_OPCODE_INTERP_OFFSET] = interp_action;
+
bld_base->op_actions[TGSI_OPCODE_TEX] = tex_action;
bld_base->op_actions[TGSI_OPCODE_TEX2] = tex_action;
bld_base->op_actions[TGSI_OPCODE_TXB] = tex_action;