Add GLSL shader gen files

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;
+}