133 lines
4.9 KiB
C
133 lines
4.9 KiB
C
/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "compiler/nir/nir_builder.h"
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#include "brw_nir.h"
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/**
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* Prior to Haswell, the hardware can't natively support GL_FIXED or
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* 2_10_10_10_REV vertex formats. This pass inserts extra shader code
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* to produce the correct values.
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*/
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static bool
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apply_attr_wa_instr(nir_builder *b, nir_instr *instr, void *cb_data)
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{
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const uint8_t *attrib_wa_flags = cb_data;
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if (instr->type != nir_instr_type_intrinsic)
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return false;
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nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
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if (intrin->intrinsic != nir_intrinsic_load_input)
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return false;
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uint8_t wa_flags = attrib_wa_flags[intrin->const_index[0]];
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if (wa_flags == 0)
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return false;
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b->cursor = nir_after_instr(instr);
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nir_ssa_def *val = &intrin->dest.ssa;
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/* Do GL_FIXED rescaling for GLES2.0. Our GL_FIXED attributes
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* come in as floating point conversions of the integer values.
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*/
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if (wa_flags & BRW_ATTRIB_WA_COMPONENT_MASK) {
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nir_ssa_def *scaled =
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nir_fmul(b, val, nir_imm_float(b, 1.0f / 65536.0f));
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nir_ssa_def *comps[4];
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for (int i = 0; i < val->num_components; i++) {
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bool rescale = i < (wa_flags & BRW_ATTRIB_WA_COMPONENT_MASK);
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comps[i] = nir_channel(b, rescale ? scaled : val, i);
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}
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val = nir_vec(b, comps, val->num_components);
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}
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/* Do sign recovery for 2101010 formats if required. */
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if (wa_flags & BRW_ATTRIB_WA_SIGN) {
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/* sign recovery shift: <22, 22, 22, 30> */
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nir_ssa_def *shift = nir_imm_ivec4(b, 22, 22, 22, 30);
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val = nir_ishr(b, nir_ishl(b, val, shift), shift);
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}
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/* Apply BGRA swizzle if required. */
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if (wa_flags & BRW_ATTRIB_WA_BGRA) {
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val = nir_swizzle(b, val, (unsigned[4]){2,1,0,3}, 4);
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}
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if (wa_flags & BRW_ATTRIB_WA_NORMALIZE) {
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/* ES 3.0 has different rules for converting signed normalized
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* fixed-point numbers than desktop GL.
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*/
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if (wa_flags & BRW_ATTRIB_WA_SIGN) {
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/* According to equation 2.2 of the ES 3.0 specification,
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* signed normalization conversion is done by:
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*
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* f = c / (2^(b-1)-1)
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*
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* OpenGL 4.2+ uses this equation as well. Since most contexts
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* promote to the new higher version, and this is what Haswell+
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* hardware does anyway, we just always use this formula.
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*/
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nir_ssa_def *es3_normalize_factor =
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nir_imm_vec4(b, 1.0f / ((1 << 9) - 1), 1.0f / ((1 << 9) - 1),
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1.0f / ((1 << 9) - 1), 1.0f / ((1 << 1) - 1));
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val = nir_fmax(b,
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nir_fmul(b, nir_i2f32(b, val), es3_normalize_factor),
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nir_imm_float(b, -1.0f));
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} else {
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/* The following equation is from the OpenGL 3.2 specification:
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*
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* 2.1 unsigned normalization
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* f = c/(2^n-1)
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*/
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nir_ssa_def *normalize_factor =
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nir_imm_vec4(b, 1.0f / ((1 << 10) - 1), 1.0f / ((1 << 10) - 1),
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1.0f / ((1 << 10) - 1), 1.0f / ((1 << 2) - 1));
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val = nir_fmul(b, nir_u2f32(b, val), normalize_factor);
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}
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}
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if (wa_flags & BRW_ATTRIB_WA_SCALE) {
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val = (wa_flags & BRW_ATTRIB_WA_SIGN) ? nir_i2f32(b, val)
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: nir_u2f32(b, val);
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}
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nir_ssa_def_rewrite_uses_after(&intrin->dest.ssa, val,
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val->parent_instr);
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return true;
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}
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bool
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brw_nir_apply_attribute_workarounds(nir_shader *shader,
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const uint8_t *attrib_wa_flags)
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{
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return nir_shader_instructions_pass(shader, apply_attr_wa_instr,
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nir_metadata_block_index |
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nir_metadata_dominance,
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(void *)attrib_wa_flags);
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}
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