First commit

src/resource/shader.h

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+#pragma once
+
+#ifdef __EMSCRIPTEN__
+  #include <GLES3/gl3.h>
+#else
+  #include <glad/glad.h>
+#endif
+
+namespace game::resource::shader
+{
+  struct Info
+  {
+    const char* vertex{};
+    const char* fragment{};
+  };
+
+#ifdef __EMSCRIPTEN__
+  constexpr auto VERTEX = R"(#version 300 es
+  layout (location = 0) in vec2 i_position;
+  layout (location = 1) in vec2 i_uv;
+  out vec2 v_uv;
+  uniform mat4 u_model;
+  uniform mat4 u_view;
+  uniform mat4 u_projection;
+  void main()
+  {
+      v_uv = i_uv;
+      mat4 transform = u_projection * u_view * u_model;
+      gl_Position = transform * vec4(i_position, 0.0, 1.0);
+  }
+  )";
+
+  constexpr auto FRAGMENT = R"(#version 300 es
+  precision mediump float;
+  in vec2 v_uv;
+  uniform sampler2D u_texture;
+  uniform vec4 u_tint;
+  uniform vec3 u_color_offset;
+  out vec4 o_fragColor;
+  void main()
+  {
+      vec4 texColor = texture(u_texture, v_uv);
+      texColor *= u_tint;
+      texColor.rgb += u_color_offset;
+      o_fragColor = texColor;
+  }
+  )";
+#else
+  constexpr auto VERTEX = R"(#version 330 core
+  layout (location = 0) in vec2 i_position;
+  layout (location = 1) in vec2 i_uv;
+  out vec2 v_uv;
+  uniform mat4 u_model;
+  uniform mat4 u_view;
+  uniform mat4 u_projection;
+  void main()
+  {
+      v_uv = i_uv;
+      mat4 transform = u_projection * u_view * u_model;
+      gl_Position = transform * vec4(i_position, 0.0, 1.0);
+  }
+  )";
+
+  constexpr auto FRAGMENT = R"(#version 330 core
+  in vec2 v_uv;
+  uniform sampler2D u_texture;
+  uniform vec4 u_tint;
+  uniform vec3 u_color_offset;
+  out vec4 o_fragColor;
+  void main()
+  {
+      vec4 texColor = texture(u_texture, v_uv);
+      texColor *= u_tint;
+      texColor.rgb += u_color_offset;
+      o_fragColor = texColor;
+  }
+  )";
+#endif
+
+  constexpr auto UNIFORM_MODEL = "u_model";
+  constexpr auto UNIFORM_VIEW = "u_view";
+  constexpr auto UNIFORM_PROJECTION = "u_projection";
+  constexpr auto UNIFORM_TEXTURE = "u_texture";
+  constexpr auto UNIFORM_TINT = "u_tint";
+  constexpr auto UNIFORM_COLOR_OFFSET = "u_color_offset";
+
+#define SHADERS X(TEXTURE, VERTEX, FRAGMENT)
+
+  enum Type
+  {
+#define X(symbol, vertex, fragment) symbol,
+    SHADERS
+#undef X
+        COUNT
+  };
+
+  constexpr Info INFO[] = {
+#define X(symbol, vertex, fragment) {vertex, fragment},
+      SHADERS
+#undef X
+  };
+}
+
+namespace game::resource
+{
+  class Shader
+  {
+  public:
+    GLint id{};
+
+    Shader() = default;
+    Shader(const char*, const char*);
+    bool is_valid() const;
+    ~Shader();
+
+    Shader& operator=(Shader&&) noexcept;
+  };
+}