[feat]: reduce renderer abstraction

1 files changed, 116 insertions, 12 deletions

diff --git a/src/rendering/renderer.cpp b/src/rendering/renderer.cpp
index 28b7962..1c82447 100644
--- a/src/rendering/renderer.cpp
+++ b/src/rendering/renderer.cpp
@@ -1,26 +1,130 @@
 #include "renderer.h"
 
-#include "platform/opengl/opengl_renderer_api.h"
-#include "platform/vulkan/vulkan_renderer_api.h"
+#include "core/log.h"
 
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
 #include <glm/gtc/matrix_transform.hpp>
 
-namespace Donut 
+namespace Donut
 {
+    RendererAPI::API RendererAPI::s_api = RendererAPI::API::OpenGL;
+
     auto RendererAPI::create() -> Scope<RendererAPI>
-     {
-        switch (s_api)
+    {
+        return create_scope<RendererAPI>();
+    }
+
+    auto RendererAPI::init() -> void
+    {
+        if (!glfwGetCurrentContext())
+        {
+            DONUT_ERROR("No OpenGL context is current! Cannot initialize GLAD.");
+            return;
+        }
+
+        if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
         {
-            case API::OpenGL:
-                return create_scope<OpenGLRendererAPI>();
-            case API::Vulkan:
-                return create_scope<VulkanRendererAPI>();
-            default:
-                return nullptr;
+            DONUT_ERROR("Failed to initialize GLAD!");
+            return;
         }
+
+        glEnable(GL_BLEND);
+        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+        glEnable(GL_DEPTH_TEST);
+        glDepthFunc(GL_LESS);
+
+        glEnable(GL_CULL_FACE);
+        glCullFace(GL_BACK);
+        glFrontFace(GL_CCW);
     }
 
-    RendererAPI::API RendererAPI::s_api = RendererAPI::API::OpenGL;
+    auto RendererAPI::set_viewport(uint32_t x, uint32_t y, uint32_t width, uint32_t height) -> void
+    {
+        glViewport(x, y, width, height);
+    }
+
+    auto RendererAPI::set_clear_color(const glm::vec4& color) -> void
+    {
+        glClearColor(color.r, color.g, color.b, color.a);
+    }
+
+    auto RendererAPI::clear() -> void
+    {
+        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    }
+
+    auto RendererAPI::enable_depth_test() -> void
+    {
+        glEnable(GL_DEPTH_TEST);
+    }
+
+    auto RendererAPI::disable_depth_test() -> void
+    {
+        glDisable(GL_DEPTH_TEST);
+    }
+
+    auto RendererAPI::set_face_culling(bool enabled) -> void
+    {
+        if (enabled)
+        {
+            glEnable(GL_CULL_FACE);
+            glCullFace(GL_BACK);
+            glFrontFace(GL_CCW);
+        }
+        else
+            glDisable(GL_CULL_FACE);
+    }
+
+    auto RendererAPI::enable_blending() -> void
+    {
+        glEnable(GL_BLEND);
+        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+    }
+
+    auto RendererAPI::disable_blending() -> void
+    {
+        glDisable(GL_BLEND);
+    }
+
+    auto RendererAPI::draw_indexed(const Ref<VertexArray>& vertex_array, uint32_t index_count) -> void
+    {
+        uint32_t count = index_count ? index_count : vertex_array->get_index_buffer()->get_count();
+        glDrawElements(GL_TRIANGLES, count, GL_UNSIGNED_INT, nullptr);
+        glBindTexture(GL_TEXTURE_2D, 0);
+    }
+
+    auto RendererAPI::draw_arrays(uint32_t vertex_count, uint32_t first) -> void
+    {
+        glDrawArrays(GL_TRIANGLES, first, vertex_count);
+    }
+
+    auto RendererAPI::draw_lines(const Ref<VertexArray>& vertex_array, uint32_t index_count) -> void
+    {
+        uint32_t count = index_count ? index_count : vertex_array->get_index_buffer()->get_count();
+        glDrawElements(GL_LINES, count, GL_UNSIGNED_INT, nullptr);
+    }
+
+    auto RendererAPI::bind_texture(uint32_t texture_id, uint32_t slot) -> void
+    {
+        glActiveTexture(GL_TEXTURE0 + slot);
+        glBindTexture(GL_TEXTURE_2D, texture_id);
+    }
+
+    auto RendererAPI::bind_image_texture(uint32_t texture_id, uint32_t slot, bool read_only) -> void
+    {
+        // Image load/store is OpenGL 4.2; the pointer is null on macOS (4.1).
+        if (glBindImageTexture == nullptr)
+            return;
+        glBindImageTexture(slot, texture_id, 0, GL_FALSE, 0,
+                          read_only ? GL_READ_ONLY : GL_WRITE_ONLY, GL_RGBA8);
+    }
+
+    auto RendererAPI::read_pixels(uint32_t x, uint32_t y, uint32_t width, uint32_t height,
+                                  uint32_t format, uint32_t type, void* pixels) -> void
+    {
+        glReadPixels(x, y, width, height, format, type, pixels);
+    }
 
     auto Renderer::init() -> void
     {