Add IGeometry, QuadShape, Drawable hierarchy

Author: karnkaul

App/Src/Main.cpp

@@ -1,5 +1,6 @@
 #include <imgui.h>
 #include <Tkge/Engine.hpp>
+#include <Tkge/Graphics/Drawable.hpp>
 #include <Tkge/Graphics/Shader.hpp>
 #include <klib/assert.hpp>
 #include <kvf/time.hpp>
@@ -52,27 +53,19 @@ namespace
 		const auto& renderDevice = engine.RenderDevice();
 		if (!shader.Load(renderDevice.get_device(), vertexSpirV, fragmentSpirV)) { throw std::runtime_error{"Failed to load shaders"}; }
 
-		static constexpr auto Vertices = std::array{
-			Tkge::Graphics::Vertex{.position = {-200.0f, -200.0f}},
-			Tkge::Graphics::Vertex{.position = {200.0f, -200.0f}},
-			Tkge::Graphics::Vertex{.position = {200.0f, 200.0f}},
-			Tkge::Graphics::Vertex{.position = {-200.0f, 200.0f}},
-		};
+		auto quad = Tkge::Graphics::Quad{};
+		quad.Create(glm::vec2{400.0f});
+		quad.transform.position.x = -250.0f;
+		quad.tint = kvf::magenta_v;
 
-		static constexpr auto Indices = std::array{
-			0u, 1u, 2u, 2u, 3u, 0u,
-		};
+		auto instancedQuad = Tkge::Graphics::InstancedQuad{};
+		instancedQuad.Create(glm::vec2{150.0f});
 
-		static constexpr auto Primitive = Tkge::Graphics::Primitive{
-			.vertices = Vertices,
-			.indices = Indices,
-		};
-
-		auto instances = std::array<Tkge::Graphics::RenderInstance, 2>{};
-		instances[0].transform.position.x = -250.0f;
-		instances[0].tint = kvf::cyan_v;
-		instances[1].transform.position.x = 250.0f;
-		instances[1].tint = kvf::yellow_v;
+		instancedQuad.instances.resize(2);
+		instancedQuad.instances[0].transform.position = {250.0f, -100.0f};
+		instancedQuad.instances[0].tint = kvf::cyan_v;
+		instancedQuad.instances[1].transform.position = {250.0f, 100.0f};
+		instancedQuad.instances[1].tint = kvf::yellow_v;
 
 		auto wireframe = false;
 		auto lineWidth = 3.0f;
@@ -87,8 +80,9 @@ namespace
 			const auto dt = deltaTime.tick();
 			elapsed += dt;
 
-			instances[0].tint.w = kvf::Color::to_u8((0.5f * std::sin(elapsed.count())) + 0.5f);
-			instances[1].tint.w = kvf::Color::to_u8((0.5f * std::sin(-elapsed.count())) + 0.5f);
+			instancedQuad.instances[0].tint.w = kvf::Color::to_u8((0.5f * std::sin(elapsed.count())) + 0.5f);
+			instancedQuad.instances[1].tint.w = kvf::Color::to_u8((0.5f * std::sin(-elapsed.count())) + 0.5f);
+			quad.tint.w = kvf::Color::to_u8((0.5f * std::cos(elapsed.count())) + 0.5f);
 
 			if (ImGui::Begin("Misc"))
 			{
@@ -102,7 +96,8 @@ namespace
 				renderer.BindShader(shader);
 				renderer.SetLineWidth(lineWidth);
 				renderer.SetWireframe(wireframe);
-				renderer.Draw(Primitive, instances);
+				instancedQuad.Draw(renderer);
+				quad.Draw(renderer);
 			}
 
 			engine.Present();

Lib/Include/Tkge/Graphics/Drawable.hpp

@@ -0,0 +1,50 @@
+#pragma once
+#include <Tkge/Graphics/Renderer.hpp>
+#include <Tkge/Graphics/Shape.hpp>
+#include <concepts>
+
+namespace Tkge::Graphics
+{
+	class IDrawable : public klib::Polymorphic
+	{
+	  public:
+		[[nodiscard]] virtual Primitive GetPrimitive() const = 0;
+		[[nodiscard]] virtual std::span<const RenderInstance> GetInstances() const = 0;
+
+		virtual void Draw(Renderer& renderer) const { renderer.Draw(GetPrimitive(), GetInstances()); }
+	};
+
+	template <std::derived_from<IGeometry> TGeometry>
+	class BasicDrawable : public TGeometry, public IDrawable
+	{
+	  public:
+		[[nodiscard]] Primitive GetPrimitive() const final
+		{
+			return Primitive{
+				.vertices = this->GetVertices(),
+				.indices = this->GetIndices(),
+				.topology = this->GetTopology(),
+			};
+		}
+	};
+
+	template <std::derived_from<IGeometry> TGeometry>
+	class Drawable : public BasicDrawable<TGeometry>, public RenderInstance
+	{
+	  public:
+		[[nodiscard]] std::span<const RenderInstance> GetInstances() const final { return {static_cast<const RenderInstance*>(this), 1}; }
+	};
+
+	template <std::derived_from<IGeometry> TGeometry>
+	class InstancedDrawable : public BasicDrawable<TGeometry>
+	{
+	  public:
+		[[nodiscard]] std::span<const RenderInstance> GetInstances() const final { return instances; }
+
+		std::vector<RenderInstance> instances{};
+	};
+
+	using Quad = Drawable<QuadShape>;
+	using InstancedQuad = InstancedDrawable<QuadShape>;
+
+} // namespace Tkge::Graphics

Lib/Include/Tkge/Graphics/IGeometry.hpp

@@ -0,0 +1,16 @@
+#pragma once
+#include <Tkge/Graphics/Vertex.hpp>
+#include <klib/polymorphic.hpp>
+#include <cstdint>
+#include <span>
+
+namespace Tkge::Graphics
+{
+	class IGeometry : public klib::Polymorphic
+	{
+	  public:
+		[[nodiscard]] virtual std::span<const Vertex> GetVertices() const = 0;
+		[[nodiscard]] virtual std::span<const std::uint32_t> GetIndices() const = 0;
+		[[nodiscard]] virtual vk::PrimitiveTopology GetTopology() const = 0;
+	};
+} // namespace Tkge::Graphics

Lib/Include/Tkge/Graphics/Shape.hpp

@@ -0,0 +1,30 @@
+#pragma once
+#include <Tkge/Graphics/IGeometry.hpp>
+#include <kvf/color.hpp>
+#include <kvf/rect.hpp>
+#include <array>
+
+namespace Tkge::Graphics
+{
+	class QuadShape : public IGeometry
+	{
+	  public:
+		static constexpr auto Indices = std::array{0u, 1u, 2u, 2u, 3u, 0u};
+		static constexpr std::size_t VertexCount{6};
+
+		[[nodiscard]] std::span<const Vertex> GetVertices() const final { return m_vertices; }
+		[[nodiscard]] std::span<const std::uint32_t> GetIndices() const final { return Indices; }
+		[[nodiscard]] vk::PrimitiveTopology GetTopology() const final { return vk::PrimitiveTopology::eTriangleList; }
+
+		void Create(const kvf::Rect<>& rect, const kvf::UvRect& uv = kvf::uv_rect_v, kvf::Color colour = kvf::white_v);
+		void Create(const glm::vec2 size) { Create(kvf::Rect<>::from_size(size)); }
+
+		[[nodiscard]] kvf::Rect<> GetRect() const;
+		[[nodiscard]] kvf::UvRect GetUv() const;
+		[[nodiscard]] glm::vec2 GetSize() const { return GetRect().size(); }
+		[[nodiscard]] kvf::Color GetColour() const { return m_vertices.front().colour; }
+
+	  private:
+		std::array<Vertex, VertexCount> m_vertices{};
+	};
+} // namespace Tkge::Graphics

Lib/Src/Graphics/Shape.cpp

@@ -0,0 +1,25 @@
+#include <Tkge/Graphics/Shape.hpp>
+
+namespace Tkge::Graphics
+{
+	namespace
+	{
+		constexpr std::size_t LeftBottom{0};
+		constexpr std::size_t RightBottom{1};
+		constexpr std::size_t RightTop{2};
+		constexpr std::size_t LeftTop{3};
+	} // namespace
+
+	void QuadShape::Create(const kvf::Rect<>& rect, const kvf::UvRect& uv, const kvf::Color colour)
+	{
+		m_vertices[LeftBottom] = Vertex{.position = rect.bottom_left(), .colour = colour.to_linear(), .uv = uv.bottom_left()};
+		m_vertices[RightBottom] = Vertex{.position = rect.bottom_right(), .colour = colour.to_linear(), .uv = uv.bottom_right()};
+		m_vertices[RightTop] = Vertex{.position = rect.top_right(), .colour = colour.to_linear(), .uv = uv.top_right()};
+		m_vertices[LeftTop] = Vertex{.position = rect.top_left(), .colour = colour.to_linear(), .uv = uv.top_left()};
+	}
+
+	kvf::Rect<> QuadShape::GetRect() const { return kvf::Rect<>{.lt = m_vertices[LeftTop].position, .rb = m_vertices[RightBottom].position}; }
+
+	[[nodiscard]] kvf::UvRect QuadShape::GetUv() const { return {.lt = m_vertices[LeftTop].uv, .rb = m_vertices[RightBottom].uv}; }
+
+} // namespace Tkge::Graphics