1 files changed, 58 insertions, 0 deletions
diff --git a/src/platform/opengl/opengl_shader.h b/src/platform/opengl/opengl_shader.h
new file mode 100644
index 0000000..289bfac
--- /dev/null
+++ b/src/platform/opengl/opengl_shader.h
@@ -0,0 +1,58 @@
+#pragma once
+
+#include "rendering/shader.h"
+
+#include <unordered_map>
+#include <glm/glm.hpp>
+
+namespace Donut 
+{
+    class OpenGLShader 
+        : public Shader 
+    {
+    public:
+        OpenGLShader(const std::string& filepath);
+        OpenGLShader(const std::string& name, const std::string& vertex_src, const std::string& fragment_src);
+        OpenGLShader(const std::string& name, const std::string& compute_src);
+        virtual ~OpenGLShader();
+
+        virtual auto bind() const -> void override;
+        virtual auto unbind() const -> void override;
+
+        virtual auto set_int(     const std::string& name, int value) -> void override;
+        virtual auto set_int_array(const std::string& name, int* values, uint32_t count) -> void override;
+        virtual auto set_float(   const std::string& name, float value) -> void override;
+        virtual auto set_float2(  const std::string& name, const glm::vec2& value) -> void override;
+        virtual auto set_float3(  const std::string& name, const glm::vec3& value) -> void override;
+        virtual auto set_float4(  const std::string& name, const glm::vec4& value) -> void override;
+        virtual auto set_mat4(    const std::string& name, const glm::mat4& value) -> void override;
+
+        virtual auto dispatch(uint32_t x, uint32_t y = 1, uint32_t z = 1) -> void override;
+        virtual auto dispatch_indirect(uint32_t offset = 0) -> void override;
+        virtual auto memory_barrier(uint32_t barriers) -> void override;
+
+        virtual auto get_name() const -> const std::string& override{ return m_name; }
+        virtual auto get_renderer_id() const -> uint32_t override{ return m_renderer_id; }
+
+        auto upload_uniform_int(     const std::string& name, int value) -> void;
+        auto upload_uniform_int_array(const std::string& name, int* values, uint32_t count) -> void;
+        auto upload_uniform_float(   const std::string& name, float value) -> void;
+        auto upload_uniform_float2(  const std::string& name, const glm::vec2& value) -> void;
+        auto upload_uniform_float3(  const std::string& name, const glm::vec3& value) -> void;
+        auto upload_uniform_float4(  const std::string& name, const glm::vec4& value) -> void;
+        auto upload_uniform_mat3(    const std::string& name, const glm::mat3& matrix) -> void;
+        auto upload_uniform_mat4(    const std::string& name, const glm::mat4& matrix) -> void;
+
+    private:
+        auto read_file(const std::string& filepath) -> std::string;
+        auto pre_process(const std::string& source) -> std::unordered_map<uint32_t, std::string>;
+        auto compile(const std::unordered_map<uint32_t, std::string>& shader_sources) -> void;
+    private:
+        uint32_t    m_renderer_id = 0;
+        std::string m_name;
+        // True when loaded from a Slang-compiled GLSL. Slang expects row-major
+        // matrix data, so matrix uniforms are transposed on upload (glm is
+        // column-major) to keep all matrix math correct.
+        bool        m_is_slang = false;
+    };
+};