1 files changed, 154 insertions, 0 deletions
diff --git a/src/shader_recompiler/backend/glasm/emit_context.cpp b/src/shader_recompiler/backend/glasm/emit_context.cpp
new file mode 100644
index 000000000..069c019ad
--- /dev/null
+++ b/src/shader_recompiler/backend/glasm/emit_context.cpp
@@ -0,0 +1,154 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <string_view>
+
+#include "shader_recompiler/backend/bindings.h"
+#include "shader_recompiler/backend/glasm/emit_context.h"
+#include "shader_recompiler/frontend/ir/program.h"
+#include "shader_recompiler/profile.h"
+#include "shader_recompiler/runtime_info.h"
+
+namespace Shader::Backend::GLASM {
+namespace {
+std::string_view InterpDecorator(Interpolation interp) {
+    switch (interp) {
+    case Interpolation::Smooth:
+        return "";
+    case Interpolation::Flat:
+        return "FLAT ";
+    case Interpolation::NoPerspective:
+        return "NOPERSPECTIVE ";
+    }
+    throw InvalidArgument("Invalid interpolation {}", interp);
+}
+
+bool IsInputArray(Stage stage) {
+    return stage == Stage::Geometry || stage == Stage::TessellationControl ||
+           stage == Stage::TessellationEval;
+}
+} // Anonymous namespace
+
+EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile& profile_,
+                         const RuntimeInfo& runtime_info_)
+    : info{program.info}, profile{profile_}, runtime_info{runtime_info_} {
+    // FIXME: Temporary partial implementation
+    u32 cbuf_index{};
+    for (const auto& desc : info.constant_buffer_descriptors) {
+        if (desc.count != 1) {
+            throw NotImplementedException("Constant buffer descriptor array");
+        }
+        Add("CBUFFER c{}[]={{program.buffer[{}]}};", desc.index, cbuf_index);
+        ++cbuf_index;
+    }
+    u32 ssbo_index{};
+    for (const auto& desc : info.storage_buffers_descriptors) {
+        if (desc.count != 1) {
+            throw NotImplementedException("Storage buffer descriptor array");
+        }
+        if (runtime_info.glasm_use_storage_buffers) {
+            Add("STORAGE ssbo{}[]={{program.storage[{}]}};", ssbo_index, bindings.storage_buffer);
+            ++bindings.storage_buffer;
+            ++ssbo_index;
+        }
+    }
+    if (!runtime_info.glasm_use_storage_buffers) {
+        if (const size_t num = info.storage_buffers_descriptors.size(); num > 0) {
+            Add("PARAM c[{}]={{program.local[0..{}]}};", num, num - 1);
+        }
+    }
+    stage = program.stage;
+    switch (program.stage) {
+    case Stage::VertexA:
+    case Stage::VertexB:
+        stage_name = "vertex";
+        attrib_name = "vertex";
+        break;
+    case Stage::TessellationControl:
+    case Stage::TessellationEval:
+        stage_name = "primitive";
+        attrib_name = "primitive";
+        break;
+    case Stage::Geometry:
+        stage_name = "primitive";
+        attrib_name = "vertex";
+        break;
+    case Stage::Fragment:
+        stage_name = "fragment";
+        attrib_name = "fragment";
+        break;
+    case Stage::Compute:
+        stage_name = "invocation";
+        break;
+    }
+    const std::string_view attr_stage{stage == Stage::Fragment ? "fragment" : "vertex"};
+    const VaryingState loads{info.loads.mask | info.passthrough.mask};
+    for (size_t index = 0; index < IR::NUM_GENERICS; ++index) {
+        if (loads.Generic(index)) {
+            Add("{}ATTRIB in_attr{}[]={{{}.attrib[{}..{}]}};",
+                InterpDecorator(info.interpolation[index]), index, attr_stage, index, index);
+        }
+    }
+    if (IsInputArray(stage) && loads.AnyComponent(IR::Attribute::PositionX)) {
+        Add("ATTRIB vertex_position=vertex.position;");
+    }
+    if (info.uses_invocation_id) {
+        Add("ATTRIB primitive_invocation=primitive.invocation;");
+    }
+    if (info.stores_tess_level_outer) {
+        Add("OUTPUT result_patch_tessouter[]={{result.patch.tessouter[0..3]}};");
+    }
+    if (info.stores_tess_level_inner) {
+        Add("OUTPUT result_patch_tessinner[]={{result.patch.tessinner[0..1]}};");
+    }
+    if (info.stores.ClipDistances()) {
+        Add("OUTPUT result_clip[]={{result.clip[0..7]}};");
+    }
+    for (size_t index = 0; index < info.uses_patches.size(); ++index) {
+        if (!info.uses_patches[index]) {
+            continue;
+        }
+        if (stage == Stage::TessellationControl) {
+            Add("OUTPUT result_patch_attrib{}[]={{result.patch.attrib[{}..{}]}};"
+                "ATTRIB primitive_out_patch_attrib{}[]={{primitive.out.patch.attrib[{}..{}]}};",
+                index, index, index, index, index, index);
+        } else {
+            Add("ATTRIB primitive_patch_attrib{}[]={{primitive.patch.attrib[{}..{}]}};", index,
+                index, index);
+        }
+    }
+    if (stage == Stage::Fragment) {
+        Add("OUTPUT frag_color0=result.color;");
+        for (size_t index = 1; index < info.stores_frag_color.size(); ++index) {
+            Add("OUTPUT frag_color{}=result.color[{}];", index, index);
+        }
+    }
+    for (size_t index = 0; index < IR::NUM_GENERICS; ++index) {
+        if (info.stores.Generic(index)) {
+            Add("OUTPUT out_attr{}[]={{result.attrib[{}..{}]}};", index, index, index);
+        }
+    }
+    image_buffer_bindings.reserve(info.image_buffer_descriptors.size());
+    for (const auto& desc : info.image_buffer_descriptors) {
+        image_buffer_bindings.push_back(bindings.image);
+        bindings.image += desc.count;
+    }
+    image_bindings.reserve(info.image_descriptors.size());
+    for (const auto& desc : info.image_descriptors) {
+        image_bindings.push_back(bindings.image);
+        bindings.image += desc.count;
+    }
+    texture_buffer_bindings.reserve(info.texture_buffer_descriptors.size());
+    for (const auto& desc : info.texture_buffer_descriptors) {
+        texture_buffer_bindings.push_back(bindings.texture);
+        bindings.texture += desc.count;
+    }
+    texture_bindings.reserve(info.texture_descriptors.size());
+    for (const auto& desc : info.texture_descriptors) {
+        texture_bindings.push_back(bindings.texture);
+        bindings.texture += desc.count;
+    }
+}
+
+} // namespace Shader::Backend::GLASM