| /* |
| * Copyright © 2015 Broadcom |
| * |
| * 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, sublicense, |
| * 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 NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS 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. |
| */ |
| |
| /* |
| * This lowering pass supports (as configured via nir_lower_tex_options) |
| * various texture related conversions: |
| * + texture projector lowering: converts the coordinate division for |
| * texture projection to be done in ALU instructions instead of |
| * asking the texture operation to do so. |
| * + lowering RECT: converts the un-normalized RECT texture coordinates |
| * to normalized coordinates with txs plus ALU instructions |
| * + saturate s/t/r coords: to emulate certain texture clamp/wrap modes, |
| * inserts instructions to clamp specified coordinates to [0.0, 1.0]. |
| * Note that this automatically triggers texture projector lowering if |
| * needed, since clamping must happen after projector lowering. |
| */ |
| |
| #include "nir.h" |
| #include "nir_builder.h" |
| |
| static void |
| project_src(nir_builder *b, nir_tex_instr *tex) |
| { |
| /* Find the projector in the srcs list, if present. */ |
| int proj_index = nir_tex_instr_src_index(tex, nir_tex_src_projector); |
| if (proj_index < 0) |
| return; |
| |
| b->cursor = nir_before_instr(&tex->instr); |
| |
| nir_ssa_def *inv_proj = |
| nir_frcp(b, nir_ssa_for_src(b, tex->src[proj_index].src, 1)); |
| |
| /* Walk through the sources projecting the arguments. */ |
| for (unsigned i = 0; i < tex->num_srcs; i++) { |
| switch (tex->src[i].src_type) { |
| case nir_tex_src_coord: |
| case nir_tex_src_comparator: |
| break; |
| default: |
| continue; |
| } |
| nir_ssa_def *unprojected = |
| nir_ssa_for_src(b, tex->src[i].src, nir_tex_instr_src_size(tex, i)); |
| nir_ssa_def *projected = nir_fmul(b, unprojected, inv_proj); |
| |
| /* Array indices don't get projected, so make an new vector with the |
| * coordinate's array index untouched. |
| */ |
| if (tex->is_array && tex->src[i].src_type == nir_tex_src_coord) { |
| switch (tex->coord_components) { |
| case 4: |
| projected = nir_vec4(b, |
| nir_channel(b, projected, 0), |
| nir_channel(b, projected, 1), |
| nir_channel(b, projected, 2), |
| nir_channel(b, unprojected, 3)); |
| break; |
| case 3: |
| projected = nir_vec3(b, |
| nir_channel(b, projected, 0), |
| nir_channel(b, projected, 1), |
| nir_channel(b, unprojected, 2)); |
| break; |
| case 2: |
| projected = nir_vec2(b, |
| nir_channel(b, projected, 0), |
| nir_channel(b, unprojected, 1)); |
| break; |
| default: |
| unreachable("bad texture coord count for array"); |
| break; |
| } |
| } |
| |
| nir_instr_rewrite_src(&tex->instr, |
| &tex->src[i].src, |
| nir_src_for_ssa(projected)); |
| } |
| |
| nir_tex_instr_remove_src(tex, proj_index); |
| } |
| |
| static bool |
| lower_offset(nir_builder *b, nir_tex_instr *tex) |
| { |
| int offset_index = nir_tex_instr_src_index(tex, nir_tex_src_offset); |
| if (offset_index < 0) |
| return false; |
| |
| int coord_index = nir_tex_instr_src_index(tex, nir_tex_src_coord); |
| assert(coord_index >= 0); |
| |
| assert(tex->src[offset_index].src.is_ssa); |
| assert(tex->src[coord_index].src.is_ssa); |
| nir_ssa_def *offset = tex->src[offset_index].src.ssa; |
| nir_ssa_def *coord = tex->src[coord_index].src.ssa; |
| |
| b->cursor = nir_before_instr(&tex->instr); |
| |
| nir_ssa_def *offset_coord; |
| if (nir_tex_instr_src_type(tex, coord_index) == nir_type_float) { |
| assert(tex->sampler_dim == GLSL_SAMPLER_DIM_RECT); |
| offset_coord = nir_fadd(b, coord, nir_i2f(b, offset)); |
| } else { |
| offset_coord = nir_iadd(b, coord, offset); |
| } |
| |
| if (tex->is_array) { |
| /* The offset is not applied to the array index */ |
| if (tex->coord_components == 2) { |
| offset_coord = nir_vec2(b, nir_channel(b, offset_coord, 0), |
| nir_channel(b, coord, 1)); |
| } else if (tex->coord_components == 3) { |
| offset_coord = nir_vec3(b, nir_channel(b, offset_coord, 0), |
| nir_channel(b, offset_coord, 1), |
| nir_channel(b, coord, 2)); |
| } else { |
| unreachable("Invalid number of components"); |
| } |
| } |
| |
| nir_instr_rewrite_src(&tex->instr, &tex->src[coord_index].src, |
| nir_src_for_ssa(offset_coord)); |
| |
| nir_tex_instr_remove_src(tex, offset_index); |
| |
| return true; |
| } |
| |
| |
| static nir_ssa_def * |
| get_texture_size(nir_builder *b, nir_tex_instr *tex) |
| { |
| b->cursor = nir_before_instr(&tex->instr); |
| |
| nir_tex_instr *txs; |
| |
| txs = nir_tex_instr_create(b->shader, 1); |
| txs->op = nir_texop_txs; |
| txs->sampler_dim = tex->sampler_dim; |
| txs->is_array = tex->is_array; |
| txs->is_shadow = tex->is_shadow; |
| txs->is_new_style_shadow = tex->is_new_style_shadow; |
| txs->texture_index = tex->texture_index; |
| txs->texture = nir_deref_var_clone(tex->texture, txs); |
| txs->sampler_index = tex->sampler_index; |
| txs->sampler = nir_deref_var_clone(tex->sampler, txs); |
| txs->dest_type = nir_type_int; |
| |
| /* only single src, the lod: */ |
| txs->src[0].src = nir_src_for_ssa(nir_imm_int(b, 0)); |
| txs->src[0].src_type = nir_tex_src_lod; |
| |
| nir_ssa_dest_init(&txs->instr, &txs->dest, tex->coord_components, 32, NULL); |
| nir_builder_instr_insert(b, &txs->instr); |
| |
| return nir_i2f(b, &txs->dest.ssa); |
| } |
| |
| static void |
| lower_rect(nir_builder *b, nir_tex_instr *tex) |
| { |
| nir_ssa_def *txs = get_texture_size(b, tex); |
| nir_ssa_def *scale = nir_frcp(b, txs); |
| |
| /* Walk through the sources normalizing the requested arguments. */ |
| for (unsigned i = 0; i < tex->num_srcs; i++) { |
| if (tex->src[i].src_type != nir_tex_src_coord) |
| continue; |
| |
| nir_ssa_def *coords = |
| nir_ssa_for_src(b, tex->src[i].src, tex->coord_components); |
| nir_instr_rewrite_src(&tex->instr, |
| &tex->src[i].src, |
| nir_src_for_ssa(nir_fmul(b, coords, scale))); |
| } |
| |
| tex->sampler_dim = GLSL_SAMPLER_DIM_2D; |
| } |
| |
| static nir_ssa_def * |
| sample_plane(nir_builder *b, nir_tex_instr *tex, int plane) |
| { |
| assert(tex->dest.is_ssa); |
| assert(nir_tex_instr_dest_size(tex) == 4); |
| assert(nir_alu_type_get_base_type(tex->dest_type) == nir_type_float); |
| assert(tex->op == nir_texop_tex); |
| assert(tex->coord_components == 2); |
| |
| nir_tex_instr *plane_tex = nir_tex_instr_create(b->shader, 2); |
| nir_src_copy(&plane_tex->src[0].src, &tex->src[0].src, plane_tex); |
| plane_tex->src[0].src_type = nir_tex_src_coord; |
| plane_tex->src[1].src = nir_src_for_ssa(nir_imm_int(b, plane)); |
| plane_tex->src[1].src_type = nir_tex_src_plane; |
| plane_tex->op = nir_texop_tex; |
| plane_tex->sampler_dim = GLSL_SAMPLER_DIM_2D; |
| plane_tex->dest_type = nir_type_float; |
| plane_tex->coord_components = 2; |
| |
| plane_tex->texture_index = tex->texture_index; |
| plane_tex->texture = nir_deref_var_clone(tex->texture, plane_tex); |
| plane_tex->sampler_index = tex->sampler_index; |
| plane_tex->sampler = nir_deref_var_clone(tex->sampler, plane_tex); |
| |
| nir_ssa_dest_init(&plane_tex->instr, &plane_tex->dest, 4, 32, NULL); |
| |
| nir_builder_instr_insert(b, &plane_tex->instr); |
| |
| return &plane_tex->dest.ssa; |
| } |
| |
| static void |
| convert_yuv_to_rgb(nir_builder *b, nir_tex_instr *tex, |
| nir_ssa_def *y, nir_ssa_def *u, nir_ssa_def *v) |
| { |
| nir_const_value m[3] = { |
| { .f32 = { 1.0f, 0.0f, 1.59602678f, 0.0f } }, |
| { .f32 = { 1.0f, -0.39176229f, -0.81296764f, 0.0f } }, |
| { .f32 = { 1.0f, 2.01723214f, 0.0f, 0.0f } } |
| }; |
| |
| nir_ssa_def *yuv = |
| nir_vec4(b, |
| nir_fmul(b, nir_imm_float(b, 1.16438356f), |
| nir_fadd(b, y, nir_imm_float(b, -0.0625f))), |
| nir_channel(b, nir_fadd(b, u, nir_imm_float(b, -0.5f)), 0), |
| nir_channel(b, nir_fadd(b, v, nir_imm_float(b, -0.5f)), 0), |
| nir_imm_float(b, 0.0)); |
| |
| nir_ssa_def *red = nir_fdot4(b, yuv, nir_build_imm(b, 4, 32, m[0])); |
| nir_ssa_def *green = nir_fdot4(b, yuv, nir_build_imm(b, 4, 32, m[1])); |
| nir_ssa_def *blue = nir_fdot4(b, yuv, nir_build_imm(b, 4, 32, m[2])); |
| |
| nir_ssa_def *result = nir_vec4(b, red, green, blue, nir_imm_float(b, 1.0f)); |
| |
| nir_ssa_def_rewrite_uses(&tex->dest.ssa, nir_src_for_ssa(result)); |
| } |
| |
| static void |
| lower_y_uv_external(nir_builder *b, nir_tex_instr *tex) |
| { |
| b->cursor = nir_after_instr(&tex->instr); |
| |
| nir_ssa_def *y = sample_plane(b, tex, 0); |
| nir_ssa_def *uv = sample_plane(b, tex, 1); |
| |
| convert_yuv_to_rgb(b, tex, |
| nir_channel(b, y, 0), |
| nir_channel(b, uv, 0), |
| nir_channel(b, uv, 1)); |
| } |
| |
| static void |
| lower_y_u_v_external(nir_builder *b, nir_tex_instr *tex) |
| { |
| b->cursor = nir_after_instr(&tex->instr); |
| |
| nir_ssa_def *y = sample_plane(b, tex, 0); |
| nir_ssa_def *u = sample_plane(b, tex, 1); |
| nir_ssa_def *v = sample_plane(b, tex, 2); |
| |
| convert_yuv_to_rgb(b, tex, |
| nir_channel(b, y, 0), |
| nir_channel(b, u, 0), |
| nir_channel(b, v, 0)); |
| } |
| |
| static void |
| lower_yx_xuxv_external(nir_builder *b, nir_tex_instr *tex) |
| { |
| b->cursor = nir_after_instr(&tex->instr); |
| |
| nir_ssa_def *y = sample_plane(b, tex, 0); |
| nir_ssa_def *xuxv = sample_plane(b, tex, 1); |
| |
| convert_yuv_to_rgb(b, tex, |
| nir_channel(b, y, 0), |
| nir_channel(b, xuxv, 1), |
| nir_channel(b, xuxv, 3)); |
| } |
| |
| /* |
| * Emits a textureLod operation used to replace an existing |
| * textureGrad instruction. |
| */ |
| static void |
| replace_gradient_with_lod(nir_builder *b, nir_ssa_def *lod, nir_tex_instr *tex) |
| { |
| /* We are going to emit a textureLod() with the same parameters except that |
| * we replace ddx/ddy with lod. |
| */ |
| int num_srcs = tex->num_srcs - 1; |
| nir_tex_instr *txl = nir_tex_instr_create(b->shader, num_srcs); |
| |
| txl->op = nir_texop_txl; |
| txl->sampler_dim = tex->sampler_dim; |
| txl->texture_index = tex->texture_index; |
| txl->dest_type = tex->dest_type; |
| txl->is_array = tex->is_array; |
| txl->is_shadow = tex->is_shadow; |
| txl->is_new_style_shadow = tex->is_new_style_shadow; |
| txl->sampler_index = tex->sampler_index; |
| txl->texture = nir_deref_var_clone(tex->texture, txl); |
| txl->sampler = nir_deref_var_clone(tex->sampler, txl); |
| txl->coord_components = tex->coord_components; |
| |
| nir_ssa_dest_init(&txl->instr, &txl->dest, 4, 32, NULL); |
| |
| int src_num = 0; |
| for (int i = 0; i < tex->num_srcs; i++) { |
| if (tex->src[i].src_type == nir_tex_src_ddx || |
| tex->src[i].src_type == nir_tex_src_ddy) |
| continue; |
| nir_src_copy(&txl->src[src_num].src, &tex->src[i].src, txl); |
| txl->src[src_num].src_type = tex->src[i].src_type; |
| src_num++; |
| } |
| |
| txl->src[src_num].src = nir_src_for_ssa(lod); |
| txl->src[src_num].src_type = nir_tex_src_lod; |
| src_num++; |
| |
| assert(src_num == num_srcs); |
| |
| nir_ssa_dest_init(&txl->instr, &txl->dest, |
| tex->dest.ssa.num_components, 32, NULL); |
| nir_builder_instr_insert(b, &txl->instr); |
| |
| nir_ssa_def_rewrite_uses(&tex->dest.ssa, nir_src_for_ssa(&txl->dest.ssa)); |
| |
| nir_instr_remove(&tex->instr); |
| } |
| |
| static void |
| lower_gradient_cube_map(nir_builder *b, nir_tex_instr *tex) |
| { |
| assert(tex->sampler_dim == GLSL_SAMPLER_DIM_CUBE); |
| assert(tex->op == nir_texop_txd); |
| assert(tex->dest.is_ssa); |
| |
| /* Use textureSize() to get the width and height of LOD 0 */ |
| nir_ssa_def *size = get_texture_size(b, tex); |
| |
| /* Cubemap texture lookups first generate a texture coordinate normalized |
| * to [-1, 1] on the appropiate face. The appropiate face is determined |
| * by which component has largest magnitude and its sign. The texture |
| * coordinate is the quotient of the remaining texture coordinates against |
| * that absolute value of the component of largest magnitude. This |
| * division requires that the computing of the derivative of the texel |
| * coordinate must use the quotient rule. The high level GLSL code is as |
| * follows: |
| * |
| * Step 1: selection |
| * |
| * vec3 abs_p, Q, dQdx, dQdy; |
| * abs_p = abs(ir->coordinate); |
| * if (abs_p.x >= max(abs_p.y, abs_p.z)) { |
| * Q = ir->coordinate.yzx; |
| * dQdx = ir->lod_info.grad.dPdx.yzx; |
| * dQdy = ir->lod_info.grad.dPdy.yzx; |
| * } |
| * if (abs_p.y >= max(abs_p.x, abs_p.z)) { |
| * Q = ir->coordinate.xzy; |
| * dQdx = ir->lod_info.grad.dPdx.xzy; |
| * dQdy = ir->lod_info.grad.dPdy.xzy; |
| * } |
| * if (abs_p.z >= max(abs_p.x, abs_p.y)) { |
| * Q = ir->coordinate; |
| * dQdx = ir->lod_info.grad.dPdx; |
| * dQdy = ir->lod_info.grad.dPdy; |
| * } |
| * |
| * Step 2: use quotient rule to compute derivative. The normalized to |
| * [-1, 1] texel coordinate is given by Q.xy / (sign(Q.z) * Q.z). We are |
| * only concerned with the magnitudes of the derivatives whose values are |
| * not affected by the sign. We drop the sign from the computation. |
| * |
| * vec2 dx, dy; |
| * float recip; |
| * |
| * recip = 1.0 / Q.z; |
| * dx = recip * ( dQdx.xy - Q.xy * (dQdx.z * recip) ); |
| * dy = recip * ( dQdy.xy - Q.xy * (dQdy.z * recip) ); |
| * |
| * Step 3: compute LOD. At this point we have the derivatives of the |
| * texture coordinates normalized to [-1,1]. We take the LOD to be |
| * result = log2(max(sqrt(dot(dx, dx)), sqrt(dy, dy)) * 0.5 * L) |
| * = -1.0 + log2(max(sqrt(dot(dx, dx)), sqrt(dy, dy)) * L) |
| * = -1.0 + log2(sqrt(max(dot(dx, dx), dot(dy,dy))) * L) |
| * = -1.0 + log2(sqrt(L * L * max(dot(dx, dx), dot(dy,dy)))) |
| * = -1.0 + 0.5 * log2(L * L * max(dot(dx, dx), dot(dy,dy))) |
| * where L is the dimension of the cubemap. The code is: |
| * |
| * float M, result; |
| * M = max(dot(dx, dx), dot(dy, dy)); |
| * L = textureSize(sampler, 0).x; |
| * result = -1.0 + 0.5 * log2(L * L * M); |
| */ |
| |
| /* coordinate */ |
| nir_ssa_def *p = |
| tex->src[nir_tex_instr_src_index(tex, nir_tex_src_coord)].src.ssa; |
| |
| /* unmodified dPdx, dPdy values */ |
| nir_ssa_def *dPdx = |
| tex->src[nir_tex_instr_src_index(tex, nir_tex_src_ddx)].src.ssa; |
| nir_ssa_def *dPdy = |
| tex->src[nir_tex_instr_src_index(tex, nir_tex_src_ddy)].src.ssa; |
| |
| nir_ssa_def *abs_p = nir_fabs(b, p); |
| nir_ssa_def *abs_p_x = nir_channel(b, abs_p, 0); |
| nir_ssa_def *abs_p_y = nir_channel(b, abs_p, 1); |
| nir_ssa_def *abs_p_z = nir_channel(b, abs_p, 2); |
| |
| /* 1. compute selector */ |
| nir_ssa_def *Q, *dQdx, *dQdy; |
| |
| nir_ssa_def *cond_z = nir_fge(b, abs_p_z, nir_fmax(b, abs_p_x, abs_p_y)); |
| nir_ssa_def *cond_y = nir_fge(b, abs_p_y, nir_fmax(b, abs_p_x, abs_p_z)); |
| |
| unsigned yzx[4] = { 1, 2, 0, 0 }; |
| unsigned xzy[4] = { 0, 2, 1, 0 }; |
| |
| Q = nir_bcsel(b, cond_z, |
| p, |
| nir_bcsel(b, cond_y, |
| nir_swizzle(b, p, xzy, 3, false), |
| nir_swizzle(b, p, yzx, 3, false))); |
| |
| dQdx = nir_bcsel(b, cond_z, |
| dPdx, |
| nir_bcsel(b, cond_y, |
| nir_swizzle(b, dPdx, xzy, 3, false), |
| nir_swizzle(b, dPdx, yzx, 3, false))); |
| |
| dQdy = nir_bcsel(b, cond_z, |
| dPdy, |
| nir_bcsel(b, cond_y, |
| nir_swizzle(b, dPdy, xzy, 3, false), |
| nir_swizzle(b, dPdy, yzx, 3, false))); |
| |
| /* 2. quotient rule */ |
| |
| /* tmp = Q.xy * recip; |
| * dx = recip * ( dQdx.xy - (tmp * dQdx.z) ); |
| * dy = recip * ( dQdy.xy - (tmp * dQdy.z) ); |
| */ |
| nir_ssa_def *rcp_Q_z = nir_frcp(b, nir_channel(b, Q, 2)); |
| |
| unsigned xy[4] = { 0, 1, 0, 0 }; |
| nir_ssa_def *Q_xy = nir_swizzle(b, Q, xy, 2, false); |
| nir_ssa_def *tmp = nir_fmul(b, Q_xy, rcp_Q_z); |
| |
| nir_ssa_def *dQdx_xy = nir_swizzle(b, dQdx, xy, 2, false); |
| nir_ssa_def *dQdx_z = nir_channel(b, dQdx, 2); |
| nir_ssa_def *dx = |
| nir_fmul(b, rcp_Q_z, nir_fsub(b, dQdx_xy, nir_fmul(b, tmp, dQdx_z))); |
| |
| nir_ssa_def *dQdy_xy = nir_swizzle(b, dQdy, xy, 2, false); |
| nir_ssa_def *dQdy_z = nir_channel(b, dQdy, 2); |
| nir_ssa_def *dy = |
| nir_fmul(b, rcp_Q_z, nir_fsub(b, dQdy_xy, nir_fmul(b, tmp, dQdy_z))); |
| |
| /* M = max(dot(dx, dx), dot(dy, dy)); */ |
| nir_ssa_def *M = nir_fmax(b, nir_fdot(b, dx, dx), nir_fdot(b, dy, dy)); |
| |
| /* size has textureSize() of LOD 0 */ |
| nir_ssa_def *L = nir_channel(b, size, 0); |
| |
| /* lod = -1.0 + 0.5 * log2(L * L * M); */ |
| nir_ssa_def *lod = |
| nir_fadd(b, |
| nir_imm_float(b, -1.0f), |
| nir_fmul(b, |
| nir_imm_float(b, 0.5f), |
| nir_flog2(b, nir_fmul(b, L, nir_fmul(b, L, M))))); |
| |
| /* 3. Replace the gradient instruction with an equivalent lod instruction */ |
| replace_gradient_with_lod(b, lod, tex); |
| } |
| |
| static void |
| lower_gradient_shadow(nir_builder *b, nir_tex_instr *tex) |
| { |
| assert(tex->sampler_dim != GLSL_SAMPLER_DIM_CUBE); |
| assert(tex->is_shadow); |
| assert(tex->op == nir_texop_txd); |
| assert(tex->dest.is_ssa); |
| |
| /* Use textureSize() to get the width and height of LOD 0 */ |
| unsigned component_mask; |
| switch (tex->sampler_dim) { |
| case GLSL_SAMPLER_DIM_3D: |
| component_mask = 7; |
| break; |
| case GLSL_SAMPLER_DIM_1D: |
| component_mask = 1; |
| break; |
| default: |
| component_mask = 3; |
| break; |
| } |
| |
| nir_ssa_def *size = |
| nir_channels(b, get_texture_size(b, tex), component_mask); |
| |
| /* Scale the gradients by width and height. Effectively, the incoming |
| * gradients are s'(x,y), t'(x,y), and r'(x,y) from equation 3.19 in the |
| * GL 3.0 spec; we want u'(x,y), which is w_t * s'(x,y). |
| */ |
| nir_ssa_def *ddx = |
| tex->src[nir_tex_instr_src_index(tex, nir_tex_src_ddx)].src.ssa; |
| nir_ssa_def *ddy = |
| tex->src[nir_tex_instr_src_index(tex, nir_tex_src_ddy)].src.ssa; |
| |
| nir_ssa_def *dPdx = nir_fmul(b, ddx, size); |
| nir_ssa_def *dPdy = nir_fmul(b, ddy, size); |
| |
| nir_ssa_def *rho; |
| if (dPdx->num_components == 1) { |
| rho = nir_fmax(b, nir_fabs(b, dPdx), nir_fabs(b, dPdy)); |
| } else { |
| rho = nir_fmax(b, |
| nir_fsqrt(b, nir_fdot(b, dPdx, dPdx)), |
| nir_fsqrt(b, nir_fdot(b, dPdy, dPdy))); |
| } |
| |
| /* lod = log2(rho). We're ignoring GL state biases for now. */ |
| nir_ssa_def *lod = nir_flog2(b, rho); |
| |
| /* Replace the gradient instruction with an equivalent lod instruction */ |
| replace_gradient_with_lod(b, lod, tex); |
| } |
| |
| static void |
| saturate_src(nir_builder *b, nir_tex_instr *tex, unsigned sat_mask) |
| { |
| b->cursor = nir_before_instr(&tex->instr); |
| |
| /* Walk through the sources saturating the requested arguments. */ |
| for (unsigned i = 0; i < tex->num_srcs; i++) { |
| if (tex->src[i].src_type != nir_tex_src_coord) |
| continue; |
| |
| nir_ssa_def *src = |
| nir_ssa_for_src(b, tex->src[i].src, tex->coord_components); |
| |
| /* split src into components: */ |
| nir_ssa_def *comp[4]; |
| |
| assume(tex->coord_components >= 1); |
| |
| for (unsigned j = 0; j < tex->coord_components; j++) |
| comp[j] = nir_channel(b, src, j); |
| |
| /* clamp requested components, array index does not get clamped: */ |
| unsigned ncomp = tex->coord_components; |
| if (tex->is_array) |
| ncomp--; |
| |
| for (unsigned j = 0; j < ncomp; j++) { |
| if ((1 << j) & sat_mask) { |
| if (tex->sampler_dim == GLSL_SAMPLER_DIM_RECT) { |
| /* non-normalized texture coords, so clamp to texture |
| * size rather than [0.0, 1.0] |
| */ |
| nir_ssa_def *txs = get_texture_size(b, tex); |
| comp[j] = nir_fmax(b, comp[j], nir_imm_float(b, 0.0)); |
| comp[j] = nir_fmin(b, comp[j], nir_channel(b, txs, j)); |
| } else { |
| comp[j] = nir_fsat(b, comp[j]); |
| } |
| } |
| } |
| |
| /* and move the result back into a single vecN: */ |
| src = nir_vec(b, comp, tex->coord_components); |
| |
| nir_instr_rewrite_src(&tex->instr, |
| &tex->src[i].src, |
| nir_src_for_ssa(src)); |
| } |
| } |
| |
| static nir_ssa_def * |
| get_zero_or_one(nir_builder *b, nir_alu_type type, uint8_t swizzle_val) |
| { |
| nir_const_value v; |
| |
| memset(&v, 0, sizeof(v)); |
| |
| if (swizzle_val == 4) { |
| v.u32[0] = v.u32[1] = v.u32[2] = v.u32[3] = 0; |
| } else { |
| assert(swizzle_val == 5); |
| if (type == nir_type_float) |
| v.f32[0] = v.f32[1] = v.f32[2] = v.f32[3] = 1.0; |
| else |
| v.u32[0] = v.u32[1] = v.u32[2] = v.u32[3] = 1; |
| } |
| |
| return nir_build_imm(b, 4, 32, v); |
| } |
| |
| static void |
| swizzle_result(nir_builder *b, nir_tex_instr *tex, const uint8_t swizzle[4]) |
| { |
| assert(tex->dest.is_ssa); |
| |
| b->cursor = nir_after_instr(&tex->instr); |
| |
| nir_ssa_def *swizzled; |
| if (tex->op == nir_texop_tg4) { |
| if (swizzle[tex->component] < 4) { |
| /* This one's easy */ |
| tex->component = swizzle[tex->component]; |
| return; |
| } else { |
| swizzled = get_zero_or_one(b, tex->dest_type, swizzle[tex->component]); |
| } |
| } else { |
| assert(nir_tex_instr_dest_size(tex) == 4); |
| if (swizzle[0] < 4 && swizzle[1] < 4 && |
| swizzle[2] < 4 && swizzle[3] < 4) { |
| unsigned swiz[4] = { swizzle[0], swizzle[1], swizzle[2], swizzle[3] }; |
| /* We have no 0's or 1's, just emit a swizzling MOV */ |
| swizzled = nir_swizzle(b, &tex->dest.ssa, swiz, 4, false); |
| } else { |
| nir_ssa_def *srcs[4]; |
| for (unsigned i = 0; i < 4; i++) { |
| if (swizzle[i] < 4) { |
| srcs[i] = nir_channel(b, &tex->dest.ssa, swizzle[i]); |
| } else { |
| srcs[i] = get_zero_or_one(b, tex->dest_type, swizzle[i]); |
| } |
| } |
| swizzled = nir_vec(b, srcs, 4); |
| } |
| } |
| |
| nir_ssa_def_rewrite_uses_after(&tex->dest.ssa, nir_src_for_ssa(swizzled), |
| swizzled->parent_instr); |
| } |
| |
| static void |
| linearize_srgb_result(nir_builder *b, nir_tex_instr *tex) |
| { |
| assert(tex->dest.is_ssa); |
| assert(nir_tex_instr_dest_size(tex) == 4); |
| assert(nir_alu_type_get_base_type(tex->dest_type) == nir_type_float); |
| |
| b->cursor = nir_after_instr(&tex->instr); |
| |
| static const unsigned swiz[4] = {0, 1, 2, 0}; |
| nir_ssa_def *comp = nir_swizzle(b, &tex->dest.ssa, swiz, 3, true); |
| |
| /* Formula is: |
| * (comp <= 0.04045) ? |
| * (comp / 12.92) : |
| * pow((comp + 0.055) / 1.055, 2.4) |
| */ |
| nir_ssa_def *low = nir_fmul(b, comp, nir_imm_float(b, 1.0 / 12.92)); |
| nir_ssa_def *high = nir_fpow(b, |
| nir_fmul(b, |
| nir_fadd(b, |
| comp, |
| nir_imm_float(b, 0.055)), |
| nir_imm_float(b, 1.0 / 1.055)), |
| nir_imm_float(b, 2.4)); |
| nir_ssa_def *cond = nir_fge(b, nir_imm_float(b, 0.04045), comp); |
| nir_ssa_def *rgb = nir_bcsel(b, cond, low, high); |
| |
| /* alpha is untouched: */ |
| nir_ssa_def *result = nir_vec4(b, |
| nir_channel(b, rgb, 0), |
| nir_channel(b, rgb, 1), |
| nir_channel(b, rgb, 2), |
| nir_channel(b, &tex->dest.ssa, 3)); |
| |
| nir_ssa_def_rewrite_uses_after(&tex->dest.ssa, nir_src_for_ssa(result), |
| result->parent_instr); |
| } |
| |
| static bool |
| nir_lower_tex_block(nir_block *block, nir_builder *b, |
| const nir_lower_tex_options *options) |
| { |
| bool progress = false; |
| |
| nir_foreach_instr_safe(instr, block) { |
| if (instr->type != nir_instr_type_tex) |
| continue; |
| |
| nir_tex_instr *tex = nir_instr_as_tex(instr); |
| bool lower_txp = !!(options->lower_txp & (1 << tex->sampler_dim)); |
| |
| /* mask of src coords to saturate (clamp): */ |
| unsigned sat_mask = 0; |
| |
| if ((1 << tex->sampler_index) & options->saturate_r) |
| sat_mask |= (1 << 2); /* .z */ |
| if ((1 << tex->sampler_index) & options->saturate_t) |
| sat_mask |= (1 << 1); /* .y */ |
| if ((1 << tex->sampler_index) & options->saturate_s) |
| sat_mask |= (1 << 0); /* .x */ |
| |
| /* If we are clamping any coords, we must lower projector first |
| * as clamping happens *after* projection: |
| */ |
| if (lower_txp || sat_mask) { |
| project_src(b, tex); |
| progress = true; |
| } |
| |
| if ((tex->op == nir_texop_txf && options->lower_txf_offset) || |
| (tex->sampler_dim == GLSL_SAMPLER_DIM_RECT && |
| options->lower_rect_offset)) { |
| progress = lower_offset(b, tex) || progress; |
| } |
| |
| if ((tex->sampler_dim == GLSL_SAMPLER_DIM_RECT) && options->lower_rect) { |
| lower_rect(b, tex); |
| progress = true; |
| } |
| |
| if ((1 << tex->texture_index) & options->lower_y_uv_external) { |
| lower_y_uv_external(b, tex); |
| progress = true; |
| } |
| |
| if ((1 << tex->texture_index) & options->lower_y_u_v_external) { |
| lower_y_u_v_external(b, tex); |
| progress = true; |
| } |
| |
| if ((1 << tex->texture_index) & options->lower_yx_xuxv_external) { |
| lower_yx_xuxv_external(b, tex); |
| progress = true; |
| } |
| |
| |
| if (sat_mask) { |
| saturate_src(b, tex, sat_mask); |
| progress = true; |
| } |
| |
| if (((1 << tex->texture_index) & options->swizzle_result) && |
| !nir_tex_instr_is_query(tex) && |
| !(tex->is_shadow && tex->is_new_style_shadow)) { |
| swizzle_result(b, tex, options->swizzles[tex->texture_index]); |
| progress = true; |
| } |
| |
| /* should be after swizzle so we know which channels are rgb: */ |
| if (((1 << tex->texture_index) & options->lower_srgb) && |
| !nir_tex_instr_is_query(tex) && !tex->is_shadow) { |
| linearize_srgb_result(b, tex); |
| progress = true; |
| } |
| |
| if (tex->op == nir_texop_txd && |
| tex->sampler_dim == GLSL_SAMPLER_DIM_CUBE && |
| (options->lower_txd_cube_map || |
| (tex->is_shadow && options->lower_txd_shadow))) { |
| lower_gradient_cube_map(b, tex); |
| progress = true; |
| continue; |
| } |
| |
| if (tex->op == nir_texop_txd && options->lower_txd_shadow && |
| tex->is_shadow && tex->sampler_dim != GLSL_SAMPLER_DIM_CUBE) { |
| lower_gradient_shadow(b, tex); |
| progress = true; |
| continue; |
| } |
| } |
| |
| return progress; |
| } |
| |
| static bool |
| nir_lower_tex_impl(nir_function_impl *impl, |
| const nir_lower_tex_options *options) |
| { |
| bool progress = false; |
| nir_builder builder; |
| nir_builder_init(&builder, impl); |
| |
| nir_foreach_block(block, impl) { |
| progress |= nir_lower_tex_block(block, &builder, options); |
| } |
| |
| nir_metadata_preserve(impl, nir_metadata_block_index | |
| nir_metadata_dominance); |
| return progress; |
| } |
| |
| bool |
| nir_lower_tex(nir_shader *shader, const nir_lower_tex_options *options) |
| { |
| bool progress = false; |
| |
| nir_foreach_function(function, shader) { |
| if (function->impl) |
| progress |= nir_lower_tex_impl(function->impl, options); |
| } |
| |
| return progress; |
| } |
