Mesa (gallium-llvmpipe): llvmpipe: Pixel packing/ unpacking and loop code generators.
Jose Fonseca
jrfonseca at kemper.freedesktop.org
Mon Jul 27 00:25:23 UTC 2009
Module: Mesa
Branch: gallium-llvmpipe
Commit: 1ae0c1478313b76e01f55a641be8afc361f6e2e9
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=1ae0c1478313b76e01f55a641be8afc361f6e2e9
Author: José Fonseca <jfonseca at vmware.com>
Date: Mon Jul 27 01:23:15 2009 +0100
llvmpipe: Pixel packing/unpacking and loop code generators.
Just a small proof of concept plus a standalone test app. Not integrated
with the rest of the driver yet.
---
src/gallium/drivers/llvmpipe/Makefile | 3 +
src/gallium/drivers/llvmpipe/SConscript | 15 ++-
src/gallium/drivers/llvmpipe/lp_bld.h | 94 ++++++++++++
src/gallium/drivers/llvmpipe/lp_bld_loop.c | 91 ++++++++++++
src/gallium/drivers/llvmpipe/lp_bld_pack.c | 132 +++++++++++++++++
src/gallium/drivers/llvmpipe/lp_bld_test.c | 199 ++++++++++++++++++++++++++
src/gallium/drivers/llvmpipe/lp_bld_unpack.c | 156 ++++++++++++++++++++
7 files changed, 689 insertions(+), 1 deletions(-)
diff --git a/src/gallium/drivers/llvmpipe/Makefile b/src/gallium/drivers/llvmpipe/Makefile
index c0c4306..a6556c5 100644
--- a/src/gallium/drivers/llvmpipe/Makefile
+++ b/src/gallium/drivers/llvmpipe/Makefile
@@ -7,6 +7,9 @@ C_SOURCES = \
lp_fs_exec.c \
lp_fs_sse.c \
lp_fs_llvm.c \
+ lp_bld_pack.c \
+ lp_bld_unpack.c \
+ lp_bld_loop.c \
lp_clear.c \
lp_flush.c \
lp_query.c \
diff --git a/src/gallium/drivers/llvmpipe/SConscript b/src/gallium/drivers/llvmpipe/SConscript
index f021549..fa3047f 100644
--- a/src/gallium/drivers/llvmpipe/SConscript
+++ b/src/gallium/drivers/llvmpipe/SConscript
@@ -2,12 +2,17 @@ Import('*')
env = env.Clone()
+env.ParseConfig('llvm-config --cflags --libs jit interpreter nativecodegen')
+
llvmpipe = env.ConvenienceLibrary(
target = 'llvmpipe',
source = [
'lp_fs_exec.c',
'lp_fs_sse.c',
'lp_fs_llvm.c',
+ 'lp_bld_pack.c',
+ 'lp_bld_unpack.c',
+ 'lp_bld_loop.c',
'lp_clear.c',
'lp_context.c',
'lp_draw_arrays.c',
@@ -43,4 +48,12 @@ llvmpipe = env.ConvenienceLibrary(
'lp_tile_cache.c',
])
-Export('softpipe')
\ No newline at end of file
+env['LINK'] = env['CXX']
+
+env.Program(
+ target = 'lp_bld_test',
+ source = ['lp_bld_test.c'],
+ LIBS = [llvmpipe] + auxiliaries + env['LIBS'],
+)
+
+Export('llvmpipe')
diff --git a/src/gallium/drivers/llvmpipe/lp_bld.h b/src/gallium/drivers/llvmpipe/lp_bld.h
new file mode 100644
index 0000000..88b70d7
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_bld.h
@@ -0,0 +1,94 @@
+/**************************************************************************
+ *
+ * Copyright 2009 Vmware, 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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 LP_BLD_H
+#define LP_BLD_H
+
+
+/**
+ * @file
+ * LLVM IR building helpers interfaces.
+ *
+ * We use LLVM-C bindings for now. They are not documented, but follow the C++
+ * interfaces very closely, and appear to be complete enough for code
+ * genration. See
+ * http://npcontemplation.blogspot.com/2008/06/secret-of-llvm-c-bindings.html
+ * for a standalone example.
+ */
+
+#include <llvm-c/Core.h>
+
+#include "pipe/p_format.h"
+
+
+/**
+ * Unpack a pixel into its RGBA components.
+ *
+ * @param ptr value with the pointer to the packed pixel. Pointer type is
+ * irrelevant.
+ *
+ * @return RGBA in a 4 floats vector.
+ */
+LLVMValueRef
+lp_build_unpack_rgba(LLVMBuilderRef builder,
+ enum pipe_format format,
+ LLVMValueRef ptr);
+
+
+/**
+ * Pack a pixel.
+ *
+ * @param rgba 4 float vector with the unpacked components.
+ */
+void
+lp_build_pack_rgba(LLVMBuilderRef builder,
+ enum pipe_format format,
+ LLVMValueRef ptr,
+ LLVMValueRef rgba);
+
+
+struct lp_build_loop_state
+{
+ LLVMBasicBlockRef block;
+ LLVMValueRef counter;
+};
+
+
+void
+lp_build_loop_begin(LLVMBuilderRef builder,
+ LLVMValueRef start,
+ struct lp_build_loop_state *state);
+
+
+void
+lp_build_loop_end(LLVMBuilderRef builder,
+ LLVMValueRef end,
+ LLVMValueRef step,
+ struct lp_build_loop_state *state);
+
+
+#endif /* !LP_BLD_H */
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_loop.c b/src/gallium/drivers/llvmpipe/lp_bld_loop.c
new file mode 100644
index 0000000..3c0a9a1
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_bld_loop.c
@@ -0,0 +1,91 @@
+/**************************************************************************
+ *
+ * Copyright 2009 Vmware, 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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 "lp_bld.h"
+
+
+/**
+ * @file
+ * Auxiliaries to build loops.
+ *
+ * LLVM's IR doesn't represent for-loops directly. Furthermore it
+ * it requires creating code blocks, branches, phi variables, so it
+ * requires a fair amount of code.
+ *
+ * @sa http://www.llvm.org/docs/tutorial/LangImpl5.html#for
+ */
+
+
+void
+lp_build_loop_begin(LLVMBuilderRef builder,
+ LLVMValueRef start,
+ struct lp_build_loop_state *state)
+{
+ LLVMBasicBlockRef block = LLVMGetInsertBlock(builder);
+ LLVMValueRef function = LLVMGetBasicBlockParent(block);
+
+ state->block = LLVMAppendBasicBlock(function, "loop");
+
+ LLVMBuildBr(builder, state->block);
+
+ LLVMPositionBuilderAtEnd(builder, state->block);
+
+ state->counter = LLVMBuildPhi(builder, LLVMTypeOf(start), "");
+
+ LLVMAddIncoming(state->counter, &start, &block, 1);
+
+}
+
+
+void
+lp_build_loop_end(LLVMBuilderRef builder,
+ LLVMValueRef end,
+ LLVMValueRef step,
+ struct lp_build_loop_state *state)
+{
+ LLVMBasicBlockRef block = LLVMGetInsertBlock(builder);
+ LLVMValueRef function = LLVMGetBasicBlockParent(block);
+ LLVMValueRef next;
+ LLVMValueRef cond;
+ LLVMBasicBlockRef after_block;
+
+ if (!step)
+ step = LLVMConstInt(LLVMTypeOf(end), 1, 0);
+
+ next = LLVMBuildAdd(builder, state->counter, step, "");
+
+ cond = LLVMBuildICmp(builder, LLVMIntNE, next, end, "");
+
+ after_block = LLVMAppendBasicBlock(function, "");
+
+ LLVMBuildCondBr(builder, cond, after_block, state->block);
+
+ LLVMAddIncoming(state->counter, &next, &block, 1);
+
+ LLVMPositionBuilderAtEnd(builder, after_block);
+}
+
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_pack.c b/src/gallium/drivers/llvmpipe/lp_bld_pack.c
new file mode 100644
index 0000000..7c2c7a7
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_bld_pack.c
@@ -0,0 +1,132 @@
+/**************************************************************************
+ *
+ * Copyright 2009 Vmware, 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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 "util/u_format.h"
+
+#include "lp_bld.h"
+
+
+void
+lp_build_pack_rgba(LLVMBuilderRef builder,
+ enum pipe_format format,
+ LLVMValueRef ptr,
+ LLVMValueRef rgba)
+{
+ const struct util_format_description *desc;
+ LLVMTypeRef type;
+ LLVMValueRef packed = NULL;
+ unsigned shift = 0;
+ unsigned i, j;
+
+ desc = util_format_description(format);
+
+ assert(desc->layout == UTIL_FORMAT_LAYOUT_RGBA);
+ assert(desc->block.width == 1);
+ assert(desc->block.height == 1);
+
+ type = LLVMIntType(desc->block.bits);
+
+ LLVMValueRef swizzles[4];
+ LLVMValueRef shifted, casted, scaled, unswizzled;
+
+
+ /* Unswizzle the color components into the source vector. */
+ for (i = 0; i < 4; ++i) {
+ for (j = 0; j < 4; ++j) {
+ if (desc->swizzle[j] == i)
+ break;
+ }
+ if (j < 4)
+ swizzles[i] = LLVMConstInt(LLVMInt32Type(), j, 0);
+ else
+ swizzles[i] = LLVMGetUndef(LLVMInt32Type());
+ }
+
+ unswizzled = LLVMBuildShuffleVector(builder, rgba,
+ LLVMGetUndef(LLVMVectorType(LLVMFloatType(), 4)),
+ LLVMConstVector(swizzles, 4), "");
+
+ LLVMValueRef shifts[4];
+ LLVMValueRef scales[4];
+ bool normalized = FALSE;
+
+ for (i = 0; i < 4; ++i) {
+ unsigned bits = desc->channel[i].size;
+
+ if (desc->channel[i].type == UTIL_FORMAT_TYPE_VOID) {
+ shifts[i] = LLVMGetUndef(LLVMInt32Type());
+ scales[i] = LLVMGetUndef(LLVMFloatType());
+ }
+ else {
+ unsigned mask = (1 << bits) - 1;
+
+ assert(desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED);
+ assert(bits < 32);
+
+ shifts[i] = LLVMConstInt(LLVMInt32Type(), shift, 0);
+
+ if (desc->channel[i].normalized) {
+ scales[i] = LLVMConstReal(LLVMFloatType(), mask);
+ normalized = TRUE;
+ }
+ else
+ scales[i] = LLVMConstReal(LLVMFloatType(), 1.0);
+ }
+
+ shift += bits;
+ }
+
+ if (normalized)
+ scaled = LLVMBuildMul(builder, unswizzled, LLVMConstVector(scales, 4), "");
+ else
+ scaled = unswizzled;
+
+ casted = LLVMBuildFPToSI(builder, scaled, LLVMVectorType(LLVMInt32Type(), 4), "");
+
+ shifted = LLVMBuildShl(builder, casted, LLVMConstVector(shifts, 4), "");
+
+ /* Bitwise or all components */
+ for (i = 0; i < 4; ++i) {
+ if (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED) {
+ LLVMValueRef component = LLVMBuildExtractElement(builder, shifted, LLVMConstInt(LLVMInt32Type(), i, 0), "");
+ if (packed)
+ packed = LLVMBuildOr(builder, packed, component, "");
+ else
+ packed = component;
+ }
+ }
+
+ if (packed) {
+
+ if (desc->block.bits < 32)
+ packed = LLVMBuildTrunc(builder, packed, type, "");
+
+ LLVMBuildStore(builder, packed, LLVMBuildBitCast(builder, ptr, LLVMPointerType(type, 0), ""));
+ }
+}
+
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_test.c b/src/gallium/drivers/llvmpipe/lp_bld_test.c
new file mode 100644
index 0000000..5325b7d
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_bld_test.c
@@ -0,0 +1,199 @@
+/**************************************************************************
+ *
+ * Copyright 2009 Vmware, 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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 <stdlib.h>
+#include <stdio.h>
+
+#include <llvm-c/Core.h>
+#include <llvm-c/Analysis.h>
+#include <llvm-c/ExecutionEngine.h>
+#include <llvm-c/Target.h>
+#include <llvm-c/Transforms/Scalar.h>
+
+#include "lp_bld.h"
+
+
+static LLVMValueRef
+add_unpack_rgba_test(LLVMModuleRef module,
+ enum pipe_format format)
+{
+ LLVMTypeRef args[] = {
+ LLVMPointerType(LLVMInt8Type(), 0),
+ LLVMPointerType(LLVMVectorType(LLVMFloatType(), 4), 0)
+ };
+ LLVMValueRef func = LLVMAddFunction(module, "unpack", LLVMFunctionType(LLVMVoidType(), args, 2, 0));
+ LLVMSetFunctionCallConv(func, LLVMCCallConv);
+ LLVMValueRef ptr = LLVMGetParam(func, 0);
+ LLVMValueRef rgba_ptr = LLVMGetParam(func, 1);
+
+ LLVMBasicBlockRef block = LLVMAppendBasicBlock(func, "entry");
+ LLVMBuilderRef builder = LLVMCreateBuilder();
+ LLVMPositionBuilderAtEnd(builder, block);
+
+ LLVMValueRef rgba;
+
+ struct lp_build_loop_state loop;
+
+ lp_build_loop_begin(builder, LLVMConstInt(LLVMInt32Type(), 1, 0), &loop);
+
+ rgba = lp_build_unpack_rgba(builder, format, ptr);
+ LLVMBuildStore(builder, rgba, rgba_ptr);
+
+ lp_build_loop_end(builder, LLVMConstInt(LLVMInt32Type(), 4, 0), NULL, &loop);
+
+ LLVMBuildRetVoid(builder);
+
+ LLVMDisposeBuilder(builder);
+ return func;
+}
+
+
+static LLVMValueRef
+add_pack_rgba_test(LLVMModuleRef module,
+ enum pipe_format format)
+{
+ LLVMTypeRef args[] = {
+ LLVMPointerType(LLVMInt8Type(), 0),
+ LLVMPointerType(LLVMVectorType(LLVMFloatType(), 4), 0)
+ };
+ LLVMValueRef func = LLVMAddFunction(module, "pack", LLVMFunctionType(LLVMVoidType(), args, 2, 0));
+ LLVMSetFunctionCallConv(func, LLVMCCallConv);
+ LLVMValueRef ptr = LLVMGetParam(func, 0);
+ LLVMValueRef rgba_ptr = LLVMGetParam(func, 1);
+
+ LLVMBasicBlockRef block = LLVMAppendBasicBlock(func, "entry");
+ LLVMBuilderRef builder = LLVMCreateBuilder();
+ LLVMPositionBuilderAtEnd(builder, block);
+
+ LLVMValueRef rgba;
+
+ rgba = LLVMBuildLoad(builder, rgba_ptr, "");
+
+ lp_build_pack_rgba(builder, format, ptr, rgba);
+
+ LLVMBuildRetVoid(builder);
+
+ LLVMDisposeBuilder(builder);
+ return func;
+}
+
+
+int main(int argc, char **argv)
+{
+ char *error = NULL;
+ int n;
+
+ if (argc > 1)
+ sscanf(argv[1], "%x", &n);
+ else
+ n = 0x0000f0f0;
+
+ LLVMModuleRef module = LLVMModuleCreateWithName("test");
+
+ enum pipe_format format;
+ format = PIPE_FORMAT_R5G6B5_UNORM;
+ LLVMValueRef unpack = add_unpack_rgba_test(module, format);
+ LLVMValueRef pack = add_pack_rgba_test(module, format);
+
+ LLVMVerifyModule(module, LLVMAbortProcessAction, &error);
+ LLVMDisposeMessage(error);
+
+ LLVMExecutionEngineRef engine;
+ LLVMModuleProviderRef provider = LLVMCreateModuleProviderForExistingModule(module);
+ error = NULL;
+ LLVMCreateJITCompiler(&engine, provider, 1, &error);
+ if (error) {
+ fprintf(stderr, "%s\n", error);
+ LLVMDisposeMessage(error);
+ abort();
+ }
+
+ LLVMPassManagerRef pass = LLVMCreatePassManager();
+#if 0
+ LLVMAddTargetData(LLVMGetExecutionEngineTargetData(engine), pass);
+ /* These are the passes currently listed in llvm-c/Transforms/Scalar.h,
+ * but there are more on SVN. */
+ LLVMAddConstantPropagationPass(pass);
+ LLVMAddInstructionCombiningPass(pass);
+ LLVMAddPromoteMemoryToRegisterPass(pass);
+ LLVMAddDemoteMemoryToRegisterPass(pass);
+ LLVMAddGVNPass(pass);
+ LLVMAddCFGSimplificationPass(pass);
+ LLVMRunPassManager(pass, module);
+#endif
+ LLVMDumpModule(module);
+
+ printf("Packed: %08x\n", n);
+
+ float rgba[4] = {0, 0, 0, 0};
+
+ {
+#if 1
+ typedef void (*unpack_ptr_t)(void *, float *);
+ unpack_ptr_t unpack_ptr = (unpack_ptr_t)LLVMGetPointerToGlobal(engine, unpack);
+
+ unpack_ptr(&n, rgba);
+#else
+ LLVMGenericValueRef exec_args[] = {
+ LLVMCreateGenericValueOfPointer(n),
+ LLVMCreateGenericValueOfPointer(rgba)
+ };
+ LLVMGenericValueRef exec_res = LLVMRunFunction(engine, unpack, 2, exec_args);
+#endif
+
+ printf("Unpacked: %f %f %f %f\n",
+ rgba[0],
+ rgba[1],
+ rgba[2],
+ rgba[3]);
+ }
+
+ n = 0;
+
+ {
+#if 1
+ typedef void (*pack_ptr_t)(void *, float *);
+ pack_ptr_t pack_ptr = (pack_ptr_t)LLVMGetPointerToGlobal(engine, pack);
+
+ pack_ptr(&n, rgba);
+#else
+ LLVMGenericValueRef exec_args[] = {
+ LLVMCreateGenericValueOfPointer(n),
+ LLVMCreateGenericValueOfPointer(rgba)
+ };
+ LLVMGenericValueRef exec_res = LLVMRunFunction(engine, pack, 2, exec_args);
+#endif
+
+ printf("Packed: %08x\n", n);
+ }
+
+ LLVMDisposePassManager(pass);
+ LLVMDisposeExecutionEngine(engine);
+
+ return 0;
+}
diff --git a/src/gallium/drivers/llvmpipe/lp_bld_unpack.c b/src/gallium/drivers/llvmpipe/lp_bld_unpack.c
new file mode 100644
index 0000000..79022c6
--- /dev/null
+++ b/src/gallium/drivers/llvmpipe/lp_bld_unpack.c
@@ -0,0 +1,156 @@
+/**************************************************************************
+ *
+ * Copyright 2009 Vmware, 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, sub license, 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS 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 "util/u_format.h"
+
+#include "lp_bld.h"
+
+
+LLVMValueRef
+lp_build_unpack_rgba(LLVMBuilderRef builder,
+ enum pipe_format format,
+ LLVMValueRef ptr)
+{
+ const struct util_format_description *desc;
+ LLVMTypeRef type;
+ LLVMValueRef deferred;
+ unsigned shift = 0;
+ unsigned i;
+
+ desc = util_format_description(format);
+
+ /* FIXME: Support more formats */
+ assert(desc->layout == UTIL_FORMAT_LAYOUT_RGBA);
+ assert(desc->block.width == 1);
+ assert(desc->block.height == 1);
+ assert(desc->block.bits <= 32);
+
+ type = LLVMIntType(desc->block.bits);
+
+ deferred = LLVMBuildLoad(builder, LLVMBuildBitCast(builder, ptr, LLVMPointerType(type, 0), ""), "");
+
+ /* Do the intermediate integer computations with 32bit integers since it
+ * matches floating point size */
+ if (desc->block.bits < 32)
+ deferred = LLVMBuildZExt(builder, deferred, LLVMInt32Type(), "");
+
+ /* Broadcast the packed value to all four channels */
+ deferred = LLVMBuildInsertElement(builder,
+ LLVMGetUndef(LLVMVectorType(LLVMInt32Type(), 4)),
+ deferred,
+ LLVMConstNull(LLVMInt32Type()),
+ "");
+ deferred = LLVMBuildShuffleVector(builder,
+ deferred,
+ LLVMGetUndef(LLVMVectorType(LLVMInt32Type(), 4)),
+ LLVMConstNull(LLVMVectorType(LLVMInt32Type(), 4)),
+ "");
+
+ LLVMValueRef shifted, casted, scaled, masked, swizzled;
+ LLVMValueRef shifts[4];
+ LLVMValueRef masks[4];
+ LLVMValueRef scales[4];
+ bool normalized = FALSE;
+ int empty_channel = -1;
+
+ /* Initialize vector constants */
+ for (i = 0; i < 4; ++i) {
+ unsigned bits = desc->channel[i].size;
+
+ if (desc->channel[i].type == UTIL_FORMAT_TYPE_VOID) {
+ shifts[i] = LLVMGetUndef(LLVMInt32Type());
+ masks[i] = LLVMConstNull(LLVMInt32Type());
+ scales[i] = LLVMConstNull(LLVMFloatType());
+ empty_channel = i;
+ }
+ else {
+ unsigned mask = (1 << bits) - 1;
+
+ assert(desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED);
+ assert(bits < 32);
+
+ shifts[i] = LLVMConstInt(LLVMInt32Type(), shift, 0);
+ masks[i] = LLVMConstInt(LLVMInt32Type(), mask, 0);
+
+ if (desc->channel[i].normalized) {
+ scales[i] = LLVMConstReal(LLVMFloatType(), 1.0/mask);
+ normalized = TRUE;
+ }
+ else
+ scales[i] = LLVMConstReal(LLVMFloatType(), 1.0);
+ }
+
+ shift += bits;
+ }
+
+ shifted = LLVMBuildLShr(builder, deferred, LLVMConstVector(shifts, 4), "");
+ masked = LLVMBuildAnd(builder, shifted, LLVMConstVector(masks, 4), "");
+ // UIToFP can't be expressed in SSE2
+ casted = LLVMBuildSIToFP(builder, masked, LLVMVectorType(LLVMFloatType(), 4), "");
+
+ if (normalized)
+ scaled = LLVMBuildMul(builder, casted, LLVMConstVector(scales, 4), "");
+ else
+ scaled = casted;
+
+ LLVMValueRef swizzles[4];
+ LLVMValueRef aux[4];
+
+ for (i = 0; i < 4; ++i)
+ aux[i] = LLVMGetUndef(LLVMFloatType());
+
+ for (i = 0; i < 4; ++i) {
+ enum util_format_swizzle swizzle = desc->swizzle[i];
+
+ switch (swizzle) {
+ case UTIL_FORMAT_SWIZZLE_X:
+ case UTIL_FORMAT_SWIZZLE_Y:
+ case UTIL_FORMAT_SWIZZLE_Z:
+ case UTIL_FORMAT_SWIZZLE_W:
+ swizzles[i] = LLVMConstInt(LLVMInt32Type(), swizzle, 0);
+ break;
+ case UTIL_FORMAT_SWIZZLE_0:
+ assert(empty_channel >= 0);
+ swizzles[i] = LLVMConstInt(LLVMInt32Type(), empty_channel, 0);
+ break;
+ case UTIL_FORMAT_SWIZZLE_1:
+ swizzles[i] = LLVMConstInt(LLVMInt32Type(), 4, 0);
+ aux[0] = LLVMConstReal(LLVMFloatType(), 1.0);
+ break;
+ case UTIL_FORMAT_SWIZZLE_NONE:
+ swizzles[i] = LLVMGetUndef(LLVMFloatType());
+ assert(0);
+ break;
+ }
+ }
+
+ swizzled = LLVMBuildShuffleVector(builder, scaled, LLVMConstVector(aux, 4), LLVMConstVector(swizzles, 4), "");
+
+ return swizzled;
+}
+
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