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#include "opengl_renderer_api.h"
#include <glad/glad.h>
#include <GLFW/glfw3.h>
namespace Donut
{
void OpenGLRendererAPI::init()
{
if (!glfwGetCurrentContext())
{
DONUT_ERROR("No OpenGL context is current! Cannot initialize GLAD.");
return;
}
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
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);
}
void OpenGLRendererAPI::set_viewport(uint32_t x, uint32_t y, uint32_t width, uint32_t height)
{
glViewport(x, y, width, height);
}
void OpenGLRendererAPI::set_clear_color(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::enable_depth_test()
{
glEnable(GL_DEPTH_TEST);
}
void OpenGLRendererAPI::disable_depth_test()
{
glDisable(GL_DEPTH_TEST);
}
void OpenGLRendererAPI::set_face_culling(bool enabled)
{
if (enabled)
{
glEnable(GL_CULL_FACE);
glCullFace(GL_BACK);
glFrontFace(GL_CCW);
}
else
glDisable(GL_CULL_FACE);
}
void OpenGLRendererAPI::enable_blending()
{
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
void OpenGLRendererAPI::disable_blending()
{
glDisable(GL_BLEND);
}
void OpenGLRendererAPI::draw_indexed(const Ref<VertexArray>& vertex_array, uint32_t index_count)
{
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);
}
};
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