[Mesa-dev] [PATCH 02/17] tgsi: add a utility for emulating some GL features
Marek Olšák
maraeo at gmail.com
Mon Oct 5 18:26:15 PDT 2015
From: Marek Olšák <marek.olsak at amd.com>
st/mesa will use this, but drivers can use it too.
---
src/gallium/auxiliary/Makefile.sources | 2 +
src/gallium/auxiliary/tgsi/tgsi_emulate.c | 168 ++++++++++++++++++++++++++++++
src/gallium/auxiliary/tgsi/tgsi_emulate.h | 38 +++++++
3 files changed, 208 insertions(+)
create mode 100644 src/gallium/auxiliary/tgsi/tgsi_emulate.c
create mode 100644 src/gallium/auxiliary/tgsi/tgsi_emulate.h
diff --git a/src/gallium/auxiliary/Makefile.sources b/src/gallium/auxiliary/Makefile.sources
index 1fa3641..9df4e26 100644
--- a/src/gallium/auxiliary/Makefile.sources
+++ b/src/gallium/auxiliary/Makefile.sources
@@ -137,6 +137,8 @@ C_SOURCES := \
tgsi/tgsi_dump.h \
tgsi/tgsi_exec.c \
tgsi/tgsi_exec.h \
+ tgsi/tgsi_emulate.c \
+ tgsi/tgsi_emulate.h \
tgsi/tgsi_info.c \
tgsi/tgsi_info.h \
tgsi/tgsi_iterate.c \
diff --git a/src/gallium/auxiliary/tgsi/tgsi_emulate.c b/src/gallium/auxiliary/tgsi/tgsi_emulate.c
new file mode 100644
index 0000000..8190872
--- /dev/null
+++ b/src/gallium/auxiliary/tgsi/tgsi_emulate.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2015 Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#include "tgsi/tgsi_transform.h"
+#include "tgsi/tgsi_scan.h"
+#include "tgsi/tgsi_dump.h"
+#include "util/u_debug.h"
+
+#include "tgsi_emulate.h"
+
+struct tgsi_emulation_context {
+ struct tgsi_transform_context base;
+ struct tgsi_shader_info info;
+ unsigned flags;
+ bool first_instruction_emitted;
+};
+
+static inline struct tgsi_emulation_context *
+tgsi_emulation_context(struct tgsi_transform_context *tctx)
+{
+ return (struct tgsi_emulation_context *)tctx;
+}
+
+static void
+transform_decl(struct tgsi_transform_context *tctx,
+ struct tgsi_full_declaration *decl)
+{
+ struct tgsi_emulation_context *ctx = tgsi_emulation_context(tctx);
+
+ if (ctx->flags & TGSI_EMU_FORCE_PERSAMPLE_INTERP &&
+ decl->Declaration.File == TGSI_FILE_INPUT) {
+ assert(decl->Declaration.Interpolate);
+ decl->Interp.Location = TGSI_INTERPOLATE_LOC_SAMPLE;
+ }
+
+ tctx->emit_declaration(tctx, decl);
+}
+
+static void
+passthrough_edgeflag(struct tgsi_transform_context *tctx)
+{
+ struct tgsi_emulation_context *ctx = tgsi_emulation_context(tctx);
+ struct tgsi_full_declaration decl;
+ struct tgsi_full_instruction new_inst;
+
+ /* Input */
+ decl = tgsi_default_full_declaration();
+ decl.Declaration.File = TGSI_FILE_INPUT;
+ decl.Range.First = decl.Range.Last = ctx->info.num_inputs;
+ tctx->emit_declaration(tctx, &decl);
+
+ /* Output */
+ decl = tgsi_default_full_declaration();
+ decl.Declaration.File = TGSI_FILE_OUTPUT;
+ decl.Declaration.Semantic = true;
+ decl.Range.First = decl.Range.Last = ctx->info.num_outputs;
+ decl.Semantic.Name = TGSI_SEMANTIC_EDGEFLAG;
+ decl.Semantic.Index = 0;
+ tctx->emit_declaration(tctx, &decl);
+
+ /* MOV */
+ new_inst = tgsi_default_full_instruction();
+ new_inst.Instruction.Opcode = TGSI_OPCODE_MOV;
+
+ new_inst.Instruction.NumDstRegs = 1;
+ new_inst.Dst[0].Register.File = TGSI_FILE_OUTPUT;
+ new_inst.Dst[0].Register.Index = ctx->info.num_outputs;
+ new_inst.Dst[0].Register.WriteMask = TGSI_WRITEMASK_XYZW;
+
+ new_inst.Instruction.NumSrcRegs = 1;
+ new_inst.Src[0].Register.File = TGSI_FILE_INPUT;
+ new_inst.Src[0].Register.Index = ctx->info.num_inputs;
+ new_inst.Src[0].Register.SwizzleX = TGSI_SWIZZLE_X;
+ new_inst.Src[0].Register.SwizzleY = TGSI_SWIZZLE_X;
+ new_inst.Src[0].Register.SwizzleZ = TGSI_SWIZZLE_X;
+ new_inst.Src[0].Register.SwizzleW = TGSI_SWIZZLE_X;
+
+ tctx->emit_instruction(tctx, &new_inst);
+}
+
+static void
+transform_instr(struct tgsi_transform_context *tctx,
+ struct tgsi_full_instruction *inst)
+{
+ struct tgsi_emulation_context *ctx = tgsi_emulation_context(tctx);
+
+ /* Pass through edgeflags. */
+ if (!ctx->first_instruction_emitted) {
+ ctx->first_instruction_emitted = true;
+
+ if (ctx->flags & TGSI_EMU_PASSTHROUGH_EDGEFLAG)
+ passthrough_edgeflag(tctx);
+ }
+
+ /* Clamp color outputs. */
+ if (ctx->flags & TGSI_EMU_CLAMP_COLOR_OUTPUTS) {
+ for (int i = 0; i < inst->Instruction.NumDstRegs; i++) {
+ unsigned semantic;
+
+ if (inst->Dst[i].Register.File != TGSI_FILE_OUTPUT ||
+ inst->Dst[i].Register.Indirect)
+ continue;
+
+ semantic =
+ ctx->info.output_semantic_name[inst->Dst[i].Register.Index];
+
+ if (semantic == TGSI_SEMANTIC_COLOR ||
+ semantic == TGSI_SEMANTIC_BCOLOR)
+ inst->Instruction.Saturate = true;
+ }
+ }
+
+ tctx->emit_instruction(tctx, inst);
+}
+
+const struct tgsi_token *
+tgsi_emulate(const struct tgsi_token *tokens, unsigned flags)
+{
+ struct tgsi_emulation_context ctx;
+ struct tgsi_token *newtoks;
+ int newlen;
+
+ if (!(flags & (TGSI_EMU_CLAMP_COLOR_OUTPUTS |
+ TGSI_EMU_PASSTHROUGH_EDGEFLAG |
+ TGSI_EMU_FORCE_PERSAMPLE_INTERP)))
+ return NULL;
+
+ memset(&ctx, 0, sizeof(ctx));
+ ctx.flags = flags;
+ tgsi_scan_shader(tokens, &ctx.info);
+
+ if (flags & TGSI_EMU_FORCE_PERSAMPLE_INTERP)
+ ctx.base.transform_declaration = transform_decl;
+
+ if (flags & (TGSI_EMU_CLAMP_COLOR_OUTPUTS |
+ TGSI_EMU_PASSTHROUGH_EDGEFLAG))
+ ctx.base.transform_instruction = transform_instr;
+
+ newlen = tgsi_num_tokens(tokens) + 20;
+ newtoks = tgsi_alloc_tokens(newlen);
+ if (!newtoks)
+ return NULL;
+
+ tgsi_transform_shader(tokens, newtoks, newlen, &ctx.base);
+ return newtoks;
+}
diff --git a/src/gallium/auxiliary/tgsi/tgsi_emulate.h b/src/gallium/auxiliary/tgsi/tgsi_emulate.h
new file mode 100644
index 0000000..425cec7
--- /dev/null
+++ b/src/gallium/auxiliary/tgsi/tgsi_emulate.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2015 Advanced Micro Devices, Inc.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#ifndef TGSI_GL_EMULATION_H_
+#define TGSI_GL_EMULATION_H_
+
+#include "pipe/p_shader_tokens.h"
+
+#define TGSI_EMU_CLAMP_COLOR_OUTPUTS (1 << 0)
+#define TGSI_EMU_PASSTHROUGH_EDGEFLAG (1 << 1)
+#define TGSI_EMU_FORCE_PERSAMPLE_INTERP (1 << 2)
+
+const struct tgsi_token *
+tgsi_emulate(const struct tgsi_token *tokens, unsigned flags);
+
+#endif /* TGSI_GL_EMULATION_H_ */
--
2.1.4
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