--- /dev/null
+/*
+ * Copyright © 2018 Intel Corporation
+ * Copyright © 2018 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.
+ */
+
+#include "v3d_compiler.h"
+#include "compiler/nir/nir_builder.h"
+#include "compiler/nir/nir_format_convert.h"
+
+/** @file v3d_nir_lower_image_load_store.c
+ *
+ * Performs any necessary lowering of GL_ARB_shader_image_load_store
+ * operations.
+ *
+ * On V3D 4.x, we just need to do format conversion for stores such that the
+ * GPU can effectively memcpy the arguments (in increments of 32-bit words)
+ * into the texel. Loads are the same as texturing, where we may need to
+ * unpack from 16-bit ints or floats.
+ *
+ * On V3D 3.x, to implement image load store we would need to do manual tiling
+ * calculations and load/store using the TMU general memory access path.
+ */
+
+bool
+v3d_gl_format_is_return_32(GLenum format)
+{
+ switch (format) {
+ case GL_R8:
+ case GL_R8_SNORM:
+ case GL_R8UI:
+ case GL_R8I:
+ case GL_RG8:
+ case GL_RG8_SNORM:
+ case GL_RG8UI:
+ case GL_RG8I:
+ case GL_RGBA8:
+ case GL_RGBA8_SNORM:
+ case GL_RGBA8UI:
+ case GL_RGBA8I:
+ case GL_R11F_G11F_B10F:
+ case GL_RGB10_A2:
+ case GL_RGB10_A2UI:
+ case GL_R16F:
+ case GL_R16UI:
+ case GL_R16I:
+ case GL_RG16F:
+ case GL_RG16UI:
+ case GL_RG16I:
+ case GL_RGBA16F:
+ case GL_RGBA16UI:
+ case GL_RGBA16I:
+ return false;
+ case GL_R16:
+ case GL_R16_SNORM:
+ case GL_RG16:
+ case GL_RG16_SNORM:
+ case GL_RGBA16:
+ case GL_RGBA16_SNORM:
+ case GL_R32F:
+ case GL_R32UI:
+ case GL_R32I:
+ case GL_RG32F:
+ case GL_RG32UI:
+ case GL_RG32I:
+ case GL_RGBA32F:
+ case GL_RGBA32UI:
+ case GL_RGBA32I:
+ return true;
+ default:
+ unreachable("Invalid image format");
+ }
+}
+
+/* Packs a 32-bit vector of colors in the range [0, (1 << bits[i]) - 1] to a
+ * 32-bit SSA value, with as many channels as necessary to store all the bits
+ */
+static nir_ssa_def *
+pack_bits(nir_builder *b, nir_ssa_def *color, const unsigned *bits,
+ int num_components, bool mask)
+{
+ nir_ssa_def *results[4];
+ int offset = 0;
+ for (int i = 0; i < num_components; i++) {
+ nir_ssa_def *chan = nir_channel(b, color, i);
+
+ /* Channels being stored shouldn't cross a 32-bit boundary. */
+ assert((offset & ~31) == ((offset + bits[i] - 1) & ~31));
+
+ if (mask) {
+ chan = nir_iand(b, chan,
+ nir_imm_int(b, (1 << bits[i]) - 1));
+ }
+
+ if (offset % 32 == 0) {
+ results[offset / 32] = chan;
+ } else {
+ results[offset / 32] =
+ nir_ior(b, results[offset / 32],
+ nir_ishl(b, chan,
+ nir_imm_int(b, offset % 32)));
+ }
+ offset += bits[i];
+ }
+
+ return nir_vec(b, results, DIV_ROUND_UP(offset, 32));
+}
+
+static nir_ssa_def *
+pack_unorm(nir_builder *b, nir_ssa_def *color, const unsigned *bits,
+ int num_components)
+{
+ color = nir_channels(b, color, (1 << num_components) - 1);
+ color = nir_format_float_to_unorm(b, color, bits);
+ return pack_bits(b, color, bits, color->num_components, false);
+}
+
+static nir_ssa_def *
+pack_snorm(nir_builder *b, nir_ssa_def *color, const unsigned *bits,
+ int num_components)
+{
+ color = nir_channels(b, color, (1 << num_components) - 1);
+ color = nir_format_float_to_snorm(b, color, bits);
+ return pack_bits(b, color, bits, color->num_components, true);
+}
+
+static nir_ssa_def *
+pack_uint(nir_builder *b, nir_ssa_def *color, const unsigned *bits,
+ int num_components)
+{
+ color = nir_channels(b, color, (1 << num_components) - 1);
+ color = nir_format_clamp_uint(b, color, bits);
+ return pack_bits(b, color, bits, num_components, false);
+}
+
+static nir_ssa_def *
+pack_sint(nir_builder *b, nir_ssa_def *color, const unsigned *bits,
+ int num_components)
+{
+ color = nir_channels(b, color, (1 << num_components) - 1);
+ color = nir_format_clamp_uint(b, color, bits);
+ return pack_bits(b, color, bits, num_components, true);
+}
+
+static nir_ssa_def *
+pack_half(nir_builder *b, nir_ssa_def *color, const unsigned *bits,
+ int num_components)
+{
+ color = nir_channels(b, color, (1 << num_components) - 1);
+ color = nir_format_float_to_half(b, color);
+ return pack_bits(b, color, bits, color->num_components, false);
+}
+
+static void
+v3d_nir_lower_image_store(nir_builder *b, nir_intrinsic_instr *instr)
+{
+ nir_variable *var = nir_intrinsic_get_var(instr, 0);
+ GLenum format = var->data.image.format;
+ static const unsigned bits_8[4] = {8, 8, 8, 8};
+ static const unsigned bits_16[4] = {16, 16, 16, 16};
+ static const unsigned bits_1010102[4] = {10, 10, 10, 2};
+
+ b->cursor = nir_before_instr(&instr->instr);
+
+ nir_ssa_def *unformatted = nir_ssa_for_src(b, instr->src[3], 4);
+ nir_ssa_def *formatted = NULL;
+ switch (format) {
+ case GL_RGBA32F:
+ case GL_RGBA32UI:
+ case GL_RGBA32I:
+ /* For 4-component 32-bit components, there's no packing to be
+ * done.
+ */
+ return;
+
+ case GL_R32F:
+ case GL_R32UI:
+ case GL_R32I:
+ /* For other 32-bit components, just reduce the size of
+ * the input vector.
+ */
+ formatted = nir_channels(b, unformatted, 1);
+ break;
+ case GL_RG32F:
+ case GL_RG32UI:
+ case GL_RG32I:
+ formatted = nir_channels(b, unformatted, 2);
+ break;
+
+ case GL_R8:
+ formatted = pack_unorm(b, unformatted, bits_8, 1);
+ break;
+ case GL_RG8:
+ formatted = pack_unorm(b, unformatted, bits_8, 2);
+ break;
+ case GL_RGBA8:
+ formatted = pack_unorm(b, unformatted, bits_8, 4);
+ break;
+
+ case GL_R8_SNORM:
+ formatted = pack_snorm(b, unformatted, bits_8, 1);
+ break;
+ case GL_RG8_SNORM:
+ formatted = pack_snorm(b, unformatted, bits_8, 2);
+ break;
+ case GL_RGBA8_SNORM:
+ formatted = pack_snorm(b, unformatted, bits_8, 4);
+ break;
+
+ case GL_R16:
+ formatted = pack_unorm(b, unformatted, bits_16, 1);
+ break;
+ case GL_RG16:
+ formatted = pack_unorm(b, unformatted, bits_16, 2);
+ break;
+ case GL_RGBA16:
+ formatted = pack_unorm(b, unformatted, bits_16, 4);
+ break;
+
+ case GL_R16_SNORM:
+ formatted = pack_snorm(b, unformatted, bits_16, 1);
+ break;
+ case GL_RG16_SNORM:
+ formatted = pack_snorm(b, unformatted, bits_16, 2);
+ break;
+ case GL_RGBA16_SNORM:
+ formatted = pack_snorm(b, unformatted, bits_16, 4);
+ break;
+
+ case GL_R16F:
+ formatted = pack_half(b, unformatted, bits_16, 1);
+ break;
+ case GL_RG16F:
+ formatted = pack_half(b, unformatted, bits_16, 2);
+ break;
+ case GL_RGBA16F:
+ formatted = pack_half(b, unformatted, bits_16, 4);
+ break;
+
+ case GL_R8UI:
+ formatted = pack_uint(b, unformatted, bits_8, 1);
+ break;
+ case GL_R8I:
+ formatted = pack_sint(b, unformatted, bits_8, 1);
+ break;
+ case GL_RG8UI:
+ formatted = pack_uint(b, unformatted, bits_8, 2);
+ break;
+ case GL_RG8I:
+ formatted = pack_sint(b, unformatted, bits_8, 2);
+ break;
+ case GL_RGBA8UI:
+ formatted = pack_uint(b, unformatted, bits_8, 4);
+ break;
+ case GL_RGBA8I:
+ formatted = pack_sint(b, unformatted, bits_8, 4);
+ break;
+
+ case GL_R16UI:
+ formatted = pack_uint(b, unformatted, bits_16, 1);
+ break;
+ case GL_R16I:
+ formatted = pack_sint(b, unformatted, bits_16, 1);
+ break;
+ case GL_RG16UI:
+ formatted = pack_uint(b, unformatted, bits_16, 2);
+ break;
+ case GL_RG16I:
+ formatted = pack_sint(b, unformatted, bits_16, 2);
+ break;
+ case GL_RGBA16UI:
+ formatted = pack_uint(b, unformatted, bits_16, 4);
+ break;
+ case GL_RGBA16I:
+ formatted = pack_sint(b, unformatted, bits_16, 4);
+ break;
+
+ case GL_R11F_G11F_B10F:
+ formatted = nir_format_pack_11f11f10f(b, unformatted);
+ break;
+ case GL_RGB9_E5:
+ formatted = nir_format_pack_r9g9b9e5(b, unformatted);
+ break;
+
+ case GL_RGB10_A2:
+ formatted = pack_unorm(b, unformatted, bits_1010102, 4);
+ break;
+
+ case GL_RGB10_A2UI:
+ formatted = pack_uint(b, unformatted, bits_1010102, 4);
+ break;
+
+ default:
+ unreachable("bad format");
+ }
+
+ nir_instr_rewrite_src(&instr->instr, &instr->src[3],
+ nir_src_for_ssa(formatted));
+ instr->num_components = formatted->num_components;
+}
+
+static void
+v3d_nir_lower_image_load(nir_builder *b, nir_intrinsic_instr *instr)
+{
+ static const unsigned bits16[] = {16, 16, 16, 16};
+ nir_variable *var = nir_intrinsic_get_var(instr, 0);
+ const struct glsl_type *sampler_type = glsl_without_array(var->type);
+ enum glsl_base_type base_type =
+ glsl_get_sampler_result_type(sampler_type);
+
+ if (v3d_gl_format_is_return_32(var->data.image.format))
+ return;
+
+ b->cursor = nir_after_instr(&instr->instr);
+
+ assert(instr->dest.is_ssa);
+ nir_ssa_def *result = &instr->dest.ssa;
+ if (base_type == GLSL_TYPE_FLOAT) {
+ nir_ssa_def *rg = nir_channel(b, result, 0);
+ nir_ssa_def *ba = nir_channel(b, result, 1);
+ result = nir_vec4(b,
+ nir_unpack_half_2x16_split_x(b, rg),
+ nir_unpack_half_2x16_split_y(b, rg),
+ nir_unpack_half_2x16_split_x(b, ba),
+ nir_unpack_half_2x16_split_y(b, ba));
+ } else if (base_type == GLSL_TYPE_INT) {
+ result = nir_format_unpack_sint(b, result, bits16, 4);
+ } else {
+ assert(base_type == GLSL_TYPE_UINT);
+ result = nir_format_unpack_uint(b, result, bits16, 4);
+ }
+
+ nir_ssa_def_rewrite_uses_after(&instr->dest.ssa, nir_src_for_ssa(result),
+ result->parent_instr);
+}
+
+void
+v3d_nir_lower_image_load_store(nir_shader *s)
+{
+ nir_foreach_function(function, s) {
+ if (!function->impl)
+ continue;
+
+ nir_builder b;
+ nir_builder_init(&b, function->impl);
+
+ nir_foreach_block(block, function->impl) {
+ nir_foreach_instr_safe(instr, block) {
+ if (instr->type != nir_instr_type_intrinsic)
+ continue;
+
+ nir_intrinsic_instr *intr =
+ nir_instr_as_intrinsic(instr);
+
+ switch (intr->intrinsic) {
+ case nir_intrinsic_image_deref_load:
+ v3d_nir_lower_image_load(&b, intr);
+ break;
+ case nir_intrinsic_image_deref_store:
+ v3d_nir_lower_image_store(&b, intr);
+ break;
+ default:
+ break;
+ }
+ }
+ }
+
+ nir_metadata_preserve(function->impl,
+ nir_metadata_block_index |
+ nir_metadata_dominance);
+ }
+}
projects / mesa.git / blobdiff