From 6f3c7d358b777d04175835f1abc019c6b5a3a884 Mon Sep 17 00:00:00 2001
From: wheremyfoodat <44909372+wheremyfoodat@users.noreply.github.com>
Date: Thu, 18 Jan 2024 00:27:17 +0200
Subject: [PATCH] Add GLSL shader gen files

---
 CMakeLists.txt                    |  4 ++--
 include/PICA/shader_gen.hpp       | 24 ++++++++++++++++++++++++
 src/core/PICA/shader_gen_glsl.cpp | 30 ++++++++++++++++++++++++++++++
 3 files changed, 56 insertions(+), 2 deletions(-)
 create mode 100644 include/PICA/shader_gen.hpp
 create mode 100644 src/core/PICA/shader_gen_glsl.cpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index b4b1503a..2d5df370 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -179,7 +179,7 @@ set(SERVICE_SOURCE_FILES src/core/services/service_manager.cpp src/core/services
 set(PICA_SOURCE_FILES src/core/PICA/gpu.cpp src/core/PICA/regs.cpp src/core/PICA/shader_unit.cpp
                       src/core/PICA/shader_interpreter.cpp src/core/PICA/dynapica/shader_rec.cpp
                       src/core/PICA/dynapica/shader_rec_emitter_x64.cpp src/core/PICA/pica_hash.cpp
-                      src/core/PICA/dynapica/shader_rec_emitter_arm64.cpp
+                      src/core/PICA/dynapica/shader_rec_emitter_arm64.cpp src/core/PICA/shader_gen_glsl.cpp
 )
 
 set(LOADER_SOURCE_FILES src/core/loader/elf.cpp src/core/loader/ncsd.cpp src/core/loader/ncch.cpp src/core/loader/3dsx.cpp src/core/loader/lz77.cpp)
@@ -244,7 +244,7 @@ set(HEADER_FILES include/emulator.hpp include/helpers.hpp include/termcolor.hpp
                  include/services/news_u.hpp include/applets/software_keyboard.hpp include/applets/applet_manager.hpp include/fs/archive_user_save_data.hpp
                  include/services/amiibo_device.hpp include/services/nfc_types.hpp include/swap.hpp include/services/csnd.hpp include/services/nwm_uds.hpp
                  include/fs/archive_system_save_data.hpp include/lua_manager.hpp include/memory_mapped_file.hpp include/hydra_icon.hpp
-                 include/PICA/dynapica/shader_rec_emitter_arm64.hpp
+                 include/PICA/dynapica/shader_rec_emitter_arm64.hpp include/PICA/shader_gen.hpp
 )
 
 cmrc_add_resource_library(
diff --git a/include/PICA/shader_gen.hpp b/include/PICA/shader_gen.hpp
new file mode 100644
index 00000000..b52cd7ab
--- /dev/null
+++ b/include/PICA/shader_gen.hpp
@@ -0,0 +1,24 @@
+#pragma once
+#include <string>
+
+#include "PICA/gpu.hpp"
+#include "PICA/regs.hpp"
+#include "helpers.hpp"
+
+namespace PICA::ShaderGen {
+	// Graphics API this shader is targetting
+	enum class API { GL, GLES, Vulkan };
+
+	// Shading language to use (Only GLSL for the time being)
+	enum class Language { GLSL };
+
+	class FragmentGenerator {
+		using PICARegs = std::array<u32, 0x300>;
+		API api;
+		Language language;
+
+	  public:
+		FragmentGenerator(API api, Language language) : api(api), language(language) {}
+		std::string generate(const PICARegs& regs);
+	};
+};  // namespace PICA::ShaderGen
\ No newline at end of file
diff --git a/src/core/PICA/shader_gen_glsl.cpp b/src/core/PICA/shader_gen_glsl.cpp
new file mode 100644
index 00000000..661002ac
--- /dev/null
+++ b/src/core/PICA/shader_gen_glsl.cpp
@@ -0,0 +1,30 @@
+#include "PICA/shader_gen.hpp"
+using namespace PICA::ShaderGen;
+
+std::string FragmentGenerator::generate(const PICARegs& regs) {
+	std::string ret = "";
+
+	switch (api) {
+		case API::GL: ret += "#version 410 core"; break;
+		case API::GLES: ret += "#version 300 es"; break;
+		default: break;
+	}
+
+	// Input and output attributes
+	ret += R"(
+		in vec3 v_tangent;
+		in vec3 v_normal;
+		in vec3 v_bitangent;
+		in vec4 v_colour;
+		in vec3 v_texcoord0;
+		in vec2 v_texcoord1;
+		in vec3 v_view;
+		in vec2 v_texcoord2;
+		flat in vec4 v_textureEnvColor[6];
+		flat in vec4 v_textureEnvBufferColor;
+
+		out vec4 fragColour;
+	)";
+
+	return ret;
+}
\ No newline at end of file