2015-11-07 15:59:09 +00:00
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/*
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* Copyright © 2015 Red Hat
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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 FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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2016-05-17 11:05:56 +01:00
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#include "program/prog_instruction.h"
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2015-11-07 15:59:09 +00:00
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/* Lower gl_FragCoord (and fddy) to account for driver's requested coordinate-
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* origin and pixel-center vs. shader. If transformation is required, a
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* gl_FbWposYTransform uniform is inserted (with the specified state-slots)
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* and additional instructions are inserted to transform gl_FragCoord (and
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* fddy src arg).
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*
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* This is based on the logic in emit_wpos()/emit_wpos_adjustment() in TGSI
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* compiler.
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*
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* Run before nir_lower_io.
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*/
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typedef struct {
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const nir_lower_wpos_ytransform_options *options;
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nir_shader *shader;
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nir_builder b;
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nir_variable *transform;
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} lower_wpos_ytransform_state;
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static nir_ssa_def *
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get_transform(lower_wpos_ytransform_state *state)
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{
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if (state->transform == NULL) {
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/* NOTE: name must be prefixed w/ "gl_" to trigger slot based
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* special handling in uniform setup:
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*/
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nir_variable *var = nir_variable_create(state->shader,
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nir_var_uniform,
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glsl_vec4_type(),
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"gl_FbWposYTransform");
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var->num_state_slots = 1;
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var->state_slots = ralloc_array(var, nir_state_slot, 1);
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2016-05-17 11:05:56 +01:00
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var->state_slots[0].swizzle = SWIZZLE_XYZW;
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2015-11-07 15:59:09 +00:00
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memcpy(var->state_slots[0].tokens, state->options->state_tokens,
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sizeof(var->state_slots[0].tokens));
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state->transform = var;
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}
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return nir_load_var(&state->b, state->transform);
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}
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/* NIR equiv of TGSI CMP instruction: */
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static nir_ssa_def *
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nir_cmp(nir_builder *b, nir_ssa_def *src0, nir_ssa_def *src1, nir_ssa_def *src2)
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{
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return nir_bcsel(b, nir_flt(b, src0, nir_imm_float(b, 0.0)), src1, src2);
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}
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/* see emit_wpos_adjustment() in st_mesa_to_tgsi.c */
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static void
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emit_wpos_adjustment(lower_wpos_ytransform_state *state,
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nir_intrinsic_instr *intr,
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bool invert, float adjX, float adjY[2])
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{
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nir_builder *b = &state->b;
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nir_variable *fragcoord = intr->variables[0]->var;
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nir_ssa_def *wpostrans, *wpos_temp, *wpos_temp_y, *wpos_input;
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assert(intr->dest.is_ssa);
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b->cursor = nir_before_instr(&intr->instr);
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wpostrans = get_transform(state);
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wpos_input = nir_load_var(b, fragcoord);
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/* First, apply the coordinate shift: */
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if (adjX || adjY[0] || adjY[1]) {
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if (adjY[0] != adjY[1]) {
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/* Adjust the y coordinate by adjY[1] or adjY[0] respectively
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* depending on whether inversion is actually going to be applied
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* or not, which is determined by testing against the inversion
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* state variable used below, which will be either +1 or -1.
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*/
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nir_ssa_def *adj_temp;
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adj_temp = nir_cmp(b,
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nir_channel(b, wpostrans, invert ? 2 : 0),
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nir_imm_vec4(b, adjX, adjY[0], 0.0f, 0.0f),
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nir_imm_vec4(b, adjX, adjY[1], 0.0f, 0.0f));
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wpos_temp = nir_fadd(b, wpos_input, adj_temp);
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} else {
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wpos_temp = nir_fadd(b,
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wpos_input,
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nir_imm_vec4(b, adjX, adjY[0], 0.0f, 0.0f));
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}
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wpos_input = wpos_temp;
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} else {
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/* MOV wpos_temp, input[wpos]
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*/
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wpos_temp = wpos_input;
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}
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/* Now the conditional y flip: STATE_FB_WPOS_Y_TRANSFORM.xy/zw will be
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* inversion/identity, or the other way around if we're drawing to an FBO.
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*/
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if (invert) {
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2016-05-18 20:14:02 +01:00
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/* wpos_temp.y = wpos_input * wpostrans.xxxx + wpostrans.yyyy */
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wpos_temp_y = nir_fadd(b, nir_fmul(b, nir_channel(b, wpos_temp, 1),
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nir_channel(b, wpostrans, 0)),
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nir_channel(b, wpostrans, 1));
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2015-11-07 15:59:09 +00:00
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} else {
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2016-05-18 20:14:02 +01:00
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/* wpos_temp.y = wpos_input * wpostrans.zzzz + wpostrans.wwww */
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wpos_temp_y = nir_fadd(b, nir_fmul(b, nir_channel(b, wpos_temp, 1),
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nir_channel(b, wpostrans, 2)),
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nir_channel(b, wpostrans, 3));
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2015-11-07 15:59:09 +00:00
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}
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wpos_temp = nir_vec4(b,
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nir_channel(b, wpos_temp, 0),
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wpos_temp_y,
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nir_channel(b, wpos_temp, 2),
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nir_channel(b, wpos_temp, 3));
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nir_ssa_def_rewrite_uses(&intr->dest.ssa, nir_src_for_ssa(wpos_temp));
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}
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static void
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lower_fragcoord(lower_wpos_ytransform_state *state, nir_intrinsic_instr *intr)
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{
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const nir_lower_wpos_ytransform_options *options = state->options;
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nir_variable *fragcoord = intr->variables[0]->var;
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float adjX = 0.0f;
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float adjY[2] = { 0.0f, 0.0f };
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bool invert = false;
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/* Based on logic in emit_wpos():
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*
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* Query the pixel center conventions supported by the pipe driver and set
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* adjX, adjY to help out if it cannot handle the requested one internally.
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*
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* The bias of the y-coordinate depends on whether y-inversion takes place
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* (adjY[1]) or not (adjY[0]), which is in turn dependent on whether we are
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Remove wrongly repeated words in comments
Clean up misrepetitions ('if if', 'the the' etc) found throughout the
comments. This has been done manually, after grepping
case-insensitively for duplicate if, is, the, then, do, for, an,
plus a few other typos corrected in fly-by
v2:
* proper commit message and non-joke title;
* replace two 'as is' followed by 'is' to 'as-is'.
v3:
* 'a integer' => 'an integer' and similar (originally spotted by
Jason Ekstrand, I fixed a few other similar ones while at it)
Signed-off-by: Giuseppe Bilotta <giuseppe.bilotta@gmail.com>
Reviewed-by: Chad Versace <chad.versace@intel.com>
2016-06-23 18:20:18 +01:00
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* drawing to an FBO (causes additional inversion), and whether the pipe
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2015-11-07 15:59:09 +00:00
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* driver origin and the requested origin differ (the latter condition is
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* stored in the 'invert' variable).
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*
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* For height = 100 (i = integer, h = half-integer, l = lower, u = upper):
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*
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* center shift only:
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* i -> h: +0.5
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* h -> i: -0.5
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*
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* inversion only:
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* l,i -> u,i: ( 0.0 + 1.0) * -1 + 100 = 99
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* l,h -> u,h: ( 0.5 + 0.0) * -1 + 100 = 99.5
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* u,i -> l,i: (99.0 + 1.0) * -1 + 100 = 0
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* u,h -> l,h: (99.5 + 0.0) * -1 + 100 = 0.5
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*
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* inversion and center shift:
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* l,i -> u,h: ( 0.0 + 0.5) * -1 + 100 = 99.5
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* l,h -> u,i: ( 0.5 + 0.5) * -1 + 100 = 99
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* u,i -> l,h: (99.0 + 0.5) * -1 + 100 = 0.5
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* u,h -> l,i: (99.5 + 0.5) * -1 + 100 = 0
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*/
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if (fragcoord->data.origin_upper_left) {
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/* Fragment shader wants origin in upper-left */
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if (options->fs_coord_origin_upper_left) {
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/* the driver supports upper-left origin */
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} else if (options->fs_coord_origin_lower_left) {
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/* the driver supports lower-left origin, need to invert Y */
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invert = true;
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} else {
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unreachable("invalid options");
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}
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} else {
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/* Fragment shader wants origin in lower-left */
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if (options->fs_coord_origin_lower_left) {
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/* the driver supports lower-left origin */
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} else if (options->fs_coord_origin_upper_left) {
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/* the driver supports upper-left origin, need to invert Y */
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invert = true;
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} else {
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unreachable("invalid options");
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}
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}
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if (fragcoord->data.pixel_center_integer) {
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/* Fragment shader wants pixel center integer */
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if (options->fs_coord_pixel_center_integer) {
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/* the driver supports pixel center integer */
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adjY[1] = 1.0f;
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} else if (options->fs_coord_pixel_center_half_integer) {
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/* the driver supports pixel center half integer, need to bias X,Y */
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adjX = -0.5f;
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adjY[0] = -0.5f;
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adjY[1] = 0.5f;
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} else {
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unreachable("invalid options");
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}
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} else {
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/* Fragment shader wants pixel center half integer */
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if (options->fs_coord_pixel_center_half_integer) {
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/* the driver supports pixel center half integer */
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} else if (options->fs_coord_pixel_center_integer) {
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/* the driver supports pixel center integer, need to bias X,Y */
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adjX = adjY[0] = adjY[1] = 0.5f;
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} else {
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unreachable("invalid options");
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}
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}
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emit_wpos_adjustment(state, intr, invert, adjX, adjY);
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}
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/* turns 'fddy(p)' into 'fddy(fmul(p, transform.x))' */
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static void
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lower_fddy(lower_wpos_ytransform_state *state, nir_alu_instr *fddy)
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{
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nir_builder *b = &state->b;
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nir_ssa_def *p, *pt, *trans;
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b->cursor = nir_before_instr(&fddy->instr);
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p = nir_ssa_for_alu_src(b, fddy, 0);
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trans = get_transform(state);
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pt = nir_fmul(b, p, nir_channel(b, trans, 0));
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nir_instr_rewrite_src(&fddy->instr,
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&fddy->src[0].src,
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nir_src_for_ssa(pt));
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2016-05-18 07:16:14 +01:00
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for (unsigned i = 0; i < 4; i++)
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fddy->src[0].swizzle[i] = MIN2(i, pt->num_components - 1);
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2015-11-07 15:59:09 +00:00
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}
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2016-05-17 11:30:58 +01:00
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/* Multiply interp_var_at_offset's offset by transform.x to flip it. */
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static void
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lower_interp_var_at_offset(lower_wpos_ytransform_state *state,
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nir_intrinsic_instr *interp)
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{
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nir_builder *b = &state->b;
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nir_ssa_def *offset;
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nir_ssa_def *flip_y;
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b->cursor = nir_before_instr(&interp->instr);
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offset = nir_ssa_for_src(b, interp->src[0], 2);
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flip_y = nir_fmul(b, nir_channel(b, offset, 1),
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nir_channel(b, get_transform(state), 0));
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nir_instr_rewrite_src(&interp->instr, &interp->src[0],
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nir_src_for_ssa(nir_vec2(b, nir_channel(b, offset, 0),
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flip_y)));
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}
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2016-11-01 18:56:13 +00:00
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static void
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lower_load_sample_pos(lower_wpos_ytransform_state *state,
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nir_intrinsic_instr *intr)
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{
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nir_builder *b = &state->b;
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b->cursor = nir_after_instr(&intr->instr);
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nir_ssa_def *pos = &intr->dest.ssa;
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nir_ssa_def *scale = nir_channel(b, get_transform(state), 0);
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nir_ssa_def *neg_scale = nir_channel(b, get_transform(state), 2);
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/* Either y or 1-y for scale equal to 1 or -1 respectively. */
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nir_ssa_def *flipped_y =
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nir_fadd(b, nir_fmax(b, neg_scale, nir_imm_float(b, 0.0)),
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nir_fmul(b, nir_channel(b, pos, 1), scale));
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nir_ssa_def *flipped_pos = nir_vec2(b, nir_channel(b, pos, 0), flipped_y);
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nir_ssa_def_rewrite_uses_after(&intr->dest.ssa, nir_src_for_ssa(flipped_pos),
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flipped_pos->parent_instr);
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}
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2016-05-18 19:19:00 +01:00
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static void
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2015-11-07 15:59:09 +00:00
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lower_wpos_ytransform_block(lower_wpos_ytransform_state *state, nir_block *block)
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{
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nir_foreach_instr_safe(instr, block) {
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if (instr->type == nir_instr_type_intrinsic) {
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nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
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if (intr->intrinsic == nir_intrinsic_load_var) {
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nir_deref_var *dvar = intr->variables[0];
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nir_variable *var = dvar->var;
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2017-06-25 14:26:01 +01:00
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if ((var->data.mode == nir_var_shader_in &&
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var->data.location == VARYING_SLOT_POS) ||
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(var->data.mode == nir_var_system_value &&
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var->data.location == SYSTEM_VALUE_FRAG_COORD)) {
|
2017-02-28 01:21:42 +00:00
|
|
|
/* gl_FragCoord should not have array/struct derefs: */
|
2015-11-07 15:59:09 +00:00
|
|
|
assert(dvar->deref.child == NULL);
|
|
|
|
lower_fragcoord(state, intr);
|
2016-11-01 18:56:13 +00:00
|
|
|
} else if (var->data.mode == nir_var_system_value &&
|
|
|
|
var->data.location == SYSTEM_VALUE_SAMPLE_POS) {
|
|
|
|
assert(dvar->deref.child == NULL);
|
|
|
|
lower_load_sample_pos(state, intr);
|
2015-11-07 15:59:09 +00:00
|
|
|
}
|
2016-05-17 11:30:58 +01:00
|
|
|
} else if (intr->intrinsic == nir_intrinsic_interp_var_at_offset) {
|
|
|
|
lower_interp_var_at_offset(state, intr);
|
2015-11-07 15:59:09 +00:00
|
|
|
}
|
|
|
|
} else if (instr->type == nir_instr_type_alu) {
|
|
|
|
nir_alu_instr *alu = nir_instr_as_alu(instr);
|
2016-05-18 18:32:33 +01:00
|
|
|
if (alu->op == nir_op_fddy ||
|
|
|
|
alu->op == nir_op_fddy_fine ||
|
|
|
|
alu->op == nir_op_fddy_coarse)
|
2015-11-07 15:59:09 +00:00
|
|
|
lower_fddy(state, alu);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
lower_wpos_ytransform_impl(lower_wpos_ytransform_state *state, nir_function_impl *impl)
|
|
|
|
{
|
|
|
|
nir_builder_init(&state->b, impl);
|
|
|
|
|
|
|
|
nir_foreach_block(block, impl) {
|
|
|
|
lower_wpos_ytransform_block(state, block);
|
|
|
|
}
|
|
|
|
nir_metadata_preserve(impl, nir_metadata_block_index |
|
|
|
|
nir_metadata_dominance);
|
|
|
|
}
|
|
|
|
|
|
|
|
bool
|
|
|
|
nir_lower_wpos_ytransform(nir_shader *shader,
|
|
|
|
const nir_lower_wpos_ytransform_options *options)
|
|
|
|
{
|
|
|
|
lower_wpos_ytransform_state state = {
|
|
|
|
.options = options,
|
|
|
|
.shader = shader,
|
|
|
|
};
|
|
|
|
|
2017-09-15 03:52:38 +01:00
|
|
|
assert(shader->info.stage == MESA_SHADER_FRAGMENT);
|
2015-11-07 15:59:09 +00:00
|
|
|
|
|
|
|
nir_foreach_function(function, shader) {
|
|
|
|
if (function->impl)
|
|
|
|
lower_wpos_ytransform_impl(&state, function->impl);
|
|
|
|
}
|
|
|
|
|
|
|
|
return state.transform != NULL;
|
|
|
|
}
|