diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp b/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp index 9682ca33189..441b2a0fd7f 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_surface_builder.cpp @@ -584,4 +584,269 @@ namespace { return dst; } } + + namespace image_format_conversion { + using image_format_info::color_u; + + namespace { + /** + * Maximum representable value in an unsigned integer with the given + * number of bits. + */ + inline unsigned + scale(unsigned n) + { + return (1 << n) - 1; + } + } + + /** + * Pack the vector \p src in a bitfield given the per-component bit + * shifts and widths. Note that bitfield components are not allowed to + * cross 32-bit boundaries. + */ + fs_reg + emit_pack(const fs_builder &bld, const fs_reg &src, + const color_u &shifts, const color_u &widths) + { + const fs_reg dst = bld.vgrf(BRW_REGISTER_TYPE_UD, 4); + bool seen[4] = {}; + + for (unsigned c = 0; c < 4; ++c) { + if (widths[c]) { + const fs_reg tmp = bld.vgrf(BRW_REGISTER_TYPE_UD); + + /* Shift each component left to the correct bitfield position. */ + bld.SHL(tmp, offset(src, bld, c), fs_reg(shifts[c] % 32)); + + /* Add everything up. */ + if (seen[shifts[c] / 32]) { + bld.OR(offset(dst, bld, shifts[c] / 32), + offset(dst, bld, shifts[c] / 32), tmp); + } else { + bld.MOV(offset(dst, bld, shifts[c] / 32), tmp); + seen[shifts[c] / 32] = true; + } + } + } + + return dst; + } + + /** + * Unpack a vector from the bitfield \p src given the per-component bit + * shifts and widths. Note that bitfield components are not allowed to + * cross 32-bit boundaries. + */ + fs_reg + emit_unpack(const fs_builder &bld, const fs_reg &src, + const color_u &shifts, const color_u &widths) + { + const fs_reg dst = bld.vgrf(src.type, 4); + + for (unsigned c = 0; c < 4; ++c) { + if (widths[c]) { + /* Shift left to discard the most significant bits. */ + bld.SHL(offset(dst, bld, c), + offset(src, bld, shifts[c] / 32), + fs_reg(32 - shifts[c] % 32 - widths[c])); + + /* Shift back to the least significant bits using an arithmetic + * shift to get sign extension on signed types. + */ + bld.ASR(offset(dst, bld, c), + offset(dst, bld, c), fs_reg(32 - widths[c])); + } + } + + return dst; + } + + /** + * Convert an integer vector into another integer vector of the + * specified bit widths, properly handling overflow. + */ + fs_reg + emit_convert_to_integer(const fs_builder &bld, const fs_reg &src, + const color_u &widths, bool is_signed) + { + const unsigned s = (is_signed ? 1 : 0); + const fs_reg dst = bld.vgrf( + is_signed ? BRW_REGISTER_TYPE_D : BRW_REGISTER_TYPE_UD, 4); + assert(src.type == dst.type); + + for (unsigned c = 0; c < 4; ++c) { + if (widths[c]) { + /* Clamp to the maximum value. */ + bld.emit_minmax(offset(dst, bld, c), offset(src, bld, c), + fs_reg((int)scale(widths[c] - s)), + BRW_CONDITIONAL_L); + + /* Clamp to the minimum value. */ + if (is_signed) + bld.emit_minmax(offset(dst, bld, c), offset(dst, bld, c), + fs_reg(-(int)scale(widths[c] - s) - 1), + BRW_CONDITIONAL_G); + } + } + + return dst; + } + + /** + * Convert a normalized fixed-point vector of the specified signedness + * and bit widths into a floating point vector. + */ + fs_reg + emit_convert_from_scaled(const fs_builder &bld, const fs_reg &src, + const color_u &widths, bool is_signed) + { + const unsigned s = (is_signed ? 1 : 0); + const fs_reg dst = bld.vgrf(BRW_REGISTER_TYPE_F, 4); + + for (unsigned c = 0; c < 4; ++c) { + if (widths[c]) { + /* Convert to float. */ + bld.MOV(offset(dst, bld, c), offset(src, bld, c)); + + /* Divide by the normalization constants. */ + bld.MUL(offset(dst, bld, c), offset(dst, bld, c), + fs_reg(1.0f / scale(widths[c] - s))); + + /* Clamp to the minimum value. */ + if (is_signed) + bld.emit_minmax(offset(dst, bld, c), + offset(dst, bld, c), fs_reg(-1.0f), + BRW_CONDITIONAL_G); + } + } + return dst; + } + + /** + * Convert a floating-point vector into a normalized fixed-point vector + * of the specified signedness and bit widths. + */ + fs_reg + emit_convert_to_scaled(const fs_builder &bld, const fs_reg &src, + const color_u &widths, bool is_signed) + { + const unsigned s = (is_signed ? 1 : 0); + const fs_reg dst = bld.vgrf( + is_signed ? BRW_REGISTER_TYPE_D : BRW_REGISTER_TYPE_UD, 4); + const fs_reg fdst = retype(dst, BRW_REGISTER_TYPE_F); + + for (unsigned c = 0; c < 4; ++c) { + if (widths[c]) { + /* Clamp the normalized floating-point argument. */ + if (is_signed) { + bld.emit_minmax(offset(fdst, bld, c), offset(src, bld, c), + fs_reg(-1.0f), BRW_CONDITIONAL_G); + + bld.emit_minmax(offset(fdst, bld, c), offset(fdst, bld, c), + fs_reg(1.0f), BRW_CONDITIONAL_L); + } else { + set_saturate(true, bld.MOV(offset(fdst, bld, c), + offset(src, bld, c))); + } + + /* Multiply by the normalization constants. */ + bld.MUL(offset(fdst, bld, c), offset(fdst, bld, c), + fs_reg((float)scale(widths[c] - s))); + + /* Convert to integer. */ + bld.RNDE(offset(fdst, bld, c), offset(fdst, bld, c)); + bld.MOV(offset(dst, bld, c), offset(fdst, bld, c)); + } + } + + return dst; + } + + /** + * Convert a floating point vector of the specified bit widths into a + * 32-bit floating point vector. + */ + fs_reg + emit_convert_from_float(const fs_builder &bld, const fs_reg &src, + const color_u &widths) + { + const fs_reg dst = bld.vgrf(BRW_REGISTER_TYPE_UD, 4); + const fs_reg fdst = retype(dst, BRW_REGISTER_TYPE_F); + + for (unsigned c = 0; c < 4; ++c) { + if (widths[c]) { + bld.MOV(offset(dst, bld, c), offset(src, bld, c)); + + /* Extend 10-bit and 11-bit floating point numbers to 15 bits. + * This works because they have a 5-bit exponent just like the + * 16-bit floating point format, and they have no sign bit. + */ + if (widths[c] < 16) + bld.SHL(offset(dst, bld, c), + offset(dst, bld, c), fs_reg(15 - widths[c])); + + /* Convert to 32-bit floating point. */ + bld.F16TO32(offset(fdst, bld, c), offset(dst, bld, c)); + } + } + + return fdst; + } + + /** + * Convert a vector into a floating point vector of the specified bit + * widths. + */ + fs_reg + emit_convert_to_float(const fs_builder &bld, const fs_reg &src, + const color_u &widths) + { + const fs_reg dst = bld.vgrf(BRW_REGISTER_TYPE_UD, 4); + const fs_reg fdst = retype(dst, BRW_REGISTER_TYPE_F); + + for (unsigned c = 0; c < 4; ++c) { + if (widths[c]) { + bld.MOV(offset(fdst, bld, c), offset(src, bld, c)); + + /* Clamp to the minimum value. */ + if (widths[c] < 16) + bld.emit_minmax(offset(fdst, bld, c), offset(fdst, bld, c), + fs_reg(0.0f), BRW_CONDITIONAL_G); + + /* Convert to 16-bit floating-point. */ + bld.F32TO16(offset(dst, bld, c), offset(fdst, bld, c)); + + /* Discard the least significant bits to get floating point + * numbers of the requested width. This works because the + * 10-bit and 11-bit floating point formats have a 5-bit + * exponent just like the 16-bit format, and they have no sign + * bit. + */ + if (widths[c] < 16) + bld.SHR(offset(dst, bld, c), offset(dst, bld, c), + fs_reg(15 - widths[c])); + } + } + + return dst; + } + + /** + * Fill missing components of a vector with 0, 0, 0, 1. + */ + fs_reg + emit_pad(const fs_builder &bld, const fs_reg &src, + const color_u &widths) + { + const fs_reg dst = bld.vgrf(src.type, 4); + const unsigned pad[] = { 0, 0, 0, 1 }; + + for (unsigned c = 0; c < 4; ++c) + bld.MOV(offset(dst, bld, c), + widths[c] ? offset(src, bld, c) : fs_reg(pad[c])); + + return dst; + } + } } |