src/gallium/drivers/llvmpipe/lp_bld_load.c

   1 /**************************************************************************
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   3  * Copyright 2009 VMware, Inc.
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  27
  28
  29 #include "util/u_format.h"
  30
  31 #include "lp_bld.h"
  32
  33
  34 LLVMValueRef
  35 lp_build_load_rgba(LLVMBuilderRef builder,
  36                    enum pipe_format format,
  37                    LLVMValueRef ptr)
  38 {
  39    const struct util_format_description *desc;
  40    LLVMTypeRef type;
  41    LLVMValueRef packed;
  42
  43    desc = util_format_description(format);
  44
  45    /* FIXME: Support more formats */
  46    assert(desc->layout == UTIL_FORMAT_LAYOUT_ARITH);
  47    assert(desc->block.width == 1);
  48    assert(desc->block.height == 1);
  49    assert(desc->block.bits <= 32);
  50
  51    type = LLVMIntType(desc->block.bits);
  52
  53    ptr = LLVMBuildBitCast(builder, ptr, LLVMPointerType(type, 0), "");
  54
  55    packed = LLVMBuildLoad(builder, ptr, "");
  56
  57    return lp_build_unpack_rgba(builder, format, packed);
  58 }
  59