feat: texture and pixel buffers

4 files changed, 116 insertions, 0 deletions

diff --git a/src/platform/opengl/opengl_renderer_api.cpp b/src/platform/opengl/opengl_renderer_api.cpp
index 49b4e53..3a147b9 100644
--- a/src/platform/opengl/opengl_renderer_api.cpp
+++ b/src/platform/opengl/opengl_renderer_api.cpp
@@ -8,6 +8,11 @@ namespace Donut
         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)
@@ -30,6 +35,18 @@ namespace Donut
         glEnable(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::draw_indexed(const std::shared_ptr<VertexArray>& vertex_array, uint32_t index_count)
     {
         uint32_t count = index_count ? index_count : vertex_array->get_index_buffer()->get_count();
diff --git a/src/platform/opengl/opengl_renderer_api.h b/src/platform/opengl/opengl_renderer_api.h
index 30be426..f28567c 100644
--- a/src/platform/opengl/opengl_renderer_api.h
+++ b/src/platform/opengl/opengl_renderer_api.h
@@ -14,6 +14,7 @@ namespace Donut
         virtual void set_clear_color(const glm::vec4& color) override;
         virtual void clear() override;
         virtual void enable_depth_test() override;
+        virtual void set_face_culling(bool enabled) override;
 
         virtual void draw_indexed(const std::shared_ptr<VertexArray>& vertex_array, uint32_t index_count = 0) override;
     };
diff --git a/src/platform/opengl/opengl_texture.cpp b/src/platform/opengl/opengl_texture.cpp
new file mode 100644
index 0000000..87e9345
--- /dev/null
+++ b/src/platform/opengl/opengl_texture.cpp
@@ -0,0 +1,65 @@
+#include "opengl_texture.h"
+#include <iostream>
+
+namespace Donut
+{
+    OpenGLTexture2D::OpenGLTexture2D(uint32_t width, uint32_t height)
+        : m_width(width), m_height(height)
+    {
+        m_internal_format = GL_RGBA8;
+        m_data_format = GL_RGBA;
+
+        glCreateTextures(GL_TEXTURE_2D, 1, &m_renderer_id);
+        glTextureStorage2D(m_renderer_id, 1, m_internal_format, m_width, m_height);
+
+        glTextureParameteri(m_renderer_id, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTextureParameteri(m_renderer_id, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+        glTextureParameteri(m_renderer_id, GL_TEXTURE_WRAP_S, GL_REPEAT);
+        glTextureParameteri(m_renderer_id, GL_TEXTURE_WRAP_T, GL_REPEAT);
+    }
+
+    OpenGLTexture2D::OpenGLTexture2D(const std::string& path)
+        : m_path(path)
+    {
+        m_width = 1;
+        m_height = 1;
+        m_internal_format = GL_RGBA8;
+        m_data_format = GL_RGBA;
+
+        glCreateTextures(GL_TEXTURE_2D, 1, &m_renderer_id);
+        glTextureStorage2D(m_renderer_id, 1, m_internal_format, m_width, m_height);
+
+        glTextureParameteri(m_renderer_id, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+        glTextureParameteri(m_renderer_id, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+        glTextureParameteri(m_renderer_id, GL_TEXTURE_WRAP_S, GL_REPEAT);
+        glTextureParameteri(m_renderer_id, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+        uint32_t white_pixel = 0xFFFFFFFF;
+        glTextureSubImage2D(m_renderer_id, 0, 0, 0, m_width, m_height, m_data_format, GL_UNSIGNED_BYTE, &white_pixel);
+
+        std::cout << "Created default texture (stb_image not available for loading: " << path << ")" << std::endl;
+    }
+
+    OpenGLTexture2D::~OpenGLTexture2D()
+    {
+        glDeleteTextures(1, &m_renderer_id);
+    }
+
+    void OpenGLTexture2D::set_data(void* data, uint32_t size)
+    {
+        uint32_t bpp = m_data_format == GL_RGBA ? 4 : 3;
+        if (size != m_width * m_height * bpp)
+        {
+            std::cout << "Data must be entire texture!" << std::endl;
+            return;
+        }
+        glTextureSubImage2D(m_renderer_id, 0, 0, 0, m_width, m_height, m_data_format, GL_UNSIGNED_BYTE, data);
+    }
+
+    void OpenGLTexture2D::bind(uint32_t slot) const
+    {
+        glBindTextureUnit(slot, m_renderer_id);
+    }
+};
diff --git a/src/platform/opengl/opengl_texture.h b/src/platform/opengl/opengl_texture.h
new file mode 100644
index 0000000..0782e8b
--- /dev/null
+++ b/src/platform/opengl/opengl_texture.h
@@ -0,0 +1,33 @@
+#pragma once
+
+#include "rendering/texture.h"
+#include <glad/glad.h>
+
+namespace Donut
+{
+    class OpenGLTexture2D : public Texture2D
+    {
+    public:
+        OpenGLTexture2D(uint32_t width, uint32_t height);
+        OpenGLTexture2D(const std::string& path);
+        virtual ~OpenGLTexture2D();
+
+        virtual uint32_t get_width() const override { return m_width; }
+        virtual uint32_t get_height() const override { return m_height; }
+        virtual uint32_t get_renderer_id() const override { return m_renderer_id; }
+
+        virtual void set_data(void* data, uint32_t size) override;
+        virtual void bind(uint32_t slot = 0) const override;
+
+        virtual bool operator==(const Texture& other) const override
+        {
+            return m_renderer_id == other.get_renderer_id();
+        }
+
+    private:
+        std::string m_path;
+        uint32_t m_width, m_height;
+        uint32_t m_renderer_id;
+        GLenum m_internal_format, m_data_format;
+    };
+}