[add]: Start of a basic rendering backend

1 files changed, 34 insertions, 0 deletions

diff --git a/src/Platform/OpenGL/OpenGLRendererAPI.cpp b/src/Platform/OpenGL/OpenGLRendererAPI.cpp
new file mode 100644
index 0000000..c1c2e9b
--- /dev/null
+++ b/src/Platform/OpenGL/OpenGLRendererAPI.cpp
@@ -0,0 +1,34 @@
+#include "OpenGLRendererAPI.h"
+#include <glad/glad.h>
+
+namespace Donut
+{
+    void OpenGLRendererAPI::Init()
+    {
+        glEnable(GL_BLEND);
+        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+        glEnable(GL_DEPTH_TEST);
+    }
+
+    void OpenGLRendererAPI::SetViewport(uint32_t x, uint32_t y, uint32_t width, uint32_t height)
+    {
+        glViewport(x, y, width, height);
+    }
+
+    void OpenGLRendererAPI::SetClearColor(const glm::vec4& color)
+    {
+        glClearColor(color.r, color.g, color.b, color.a);
+    }
+
+    void OpenGLRendererAPI::Clear()
+    {
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    }
+
+    void OpenGLRendererAPI::DrawIndexed(const std::shared_ptr<VertexArray>& vertexArray, uint32_t indexCount)
+    {
+        uint32_t count = indexCount ? indexCount : vertexArray->GetIndexBuffer()->GetCount();
+        glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_INT, nullptr);
+        glBindTexture(GL_TEXTURE_2D, 0);
+    }
+};