diff options
Diffstat (limited to 'src/gallium/drivers/llvmpipe/lp_bld_unpack.c')
-rw-r--r-- | src/gallium/drivers/llvmpipe/lp_bld_unpack.c | 156 |
1 files changed, 156 insertions, 0 deletions
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 0000000000..79022c68a6 --- /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; +} + |