Asset+Component+Render: Render quads in the world as 3D objects

assets/glsl/batch-2d.vert

@@ -9,16 +9,11 @@ out vec4 v_color;
 out vec2 v_textureCoordinates;
 out flat uint v_textureIndex;
 
-layout(std140, binding = 0) uniform Camera
-{
-	mat4 u_projectionView;
-};
-
 void main()
 {
 	v_color = a_color;
 	v_textureCoordinates = a_textureCoordinates;
 	v_textureIndex = a_textureIndex;
-	// Vclip = Camera projection * Camera view * Model transform * Vlocal
-	gl_Position = u_projectionView * vec4(a_position, 1.0f);
+	// Vclip = Model transform * Vlocal
+	gl_Position = vec4(a_position, 1.0f);
 }

assets/glsl/batch-3d.frag

@@ -3,6 +3,7 @@
 layout(location = 0) out vec4 color;
 
 in vec3 v_normal;
+in vec4 v_color;
 in vec2 v_textureCoordinates;
 in flat uint v_textureIndex;
 
@@ -10,7 +11,7 @@ uniform sampler2D u_textures[32];
 
 void main()
 {
-	vec4 textureColor = vec4(1.0f);
+	vec4 textureColor = v_color;
 	switch(v_textureIndex) {
 		case 0:  break; // Texture unit 0 is reserved for no texture
 		case 1:  textureColor *= texture(u_textures[1],  v_textureCoordinates); break;

assets/glsl/batch-3d.vert

@@ -2,10 +2,12 @@
 
 layout(location = 0) in vec3 a_position;
 layout(location = 1) in vec3 a_normal;
-layout(location = 2) in vec2 a_textureCoordinates;
-layout(location = 3) in uint a_textureIndex;
+layout(location = 2) in vec4 a_color;
+layout(location = 3) in vec2 a_textureCoordinates;
+layout(location = 4) in uint a_textureIndex;
 
 out vec3 v_normal;
+out vec4 v_color;
 out vec2 v_textureCoordinates;
 out flat uint v_textureIndex;
 
@@ -17,6 +19,7 @@ layout(std140, binding = 0) uniform Camera
 void main()
 {
 	v_normal = a_normal;
+	v_color = a_color;
 	v_textureCoordinates = a_textureCoordinates;
 	v_textureIndex = a_textureIndex;
 	// Vclip = Camera projection * Camera view * Model transform * Vlocal

assets/model/quad.obj

@@ -0,0 +1,15 @@
+# Blender 4.2.0
+# www.blender.org
+usemtl (null)
+o Plane
+v -1.000000 -1.000000 -0.000000
+v 1.000000 -1.000000 -0.000000
+v -1.000000 1.000000 0.000000
+v 1.000000 1.000000 0.000000
+vn -0.0000 -0.0000 1.0000
+vt 0.000000 0.000000
+vt 1.000000 0.000000
+vt 1.000000 1.000000
+vt 0.000000 1.000000
+s 0
+f 1/1/1 2/2/1 4/3/1 3/4/1

assets/scene/scene1.json

@@ -35,8 +35,9 @@
 				"rotate": [ 0.0, 0.0, 0.0 ],
 				"scale": [ 1.0, 1.0, 1.0 ]
 			},
-			"sprite": {
+			"model": {
 				"color": [ 1.0, 1.0, 1.0, 1.0 ],
+				"model": "assets/model/quad.obj",
 				"texture": "assets/gfx/test.png"
 			}
 		},
@@ -48,8 +49,9 @@
 				"rotate": [ 0.0, 0.0, 0.0 ],
 				"scale": [ 1.0, 1.0, 1.0 ]
 			},
-			"sprite": {
+			"model": {
 				"color": [ 0.5, 0.6, 0.8, 1.0 ],
+				"model": "assets/model/quad.obj",
 				"texture": "assets/gfx/test.png"
 			}
 		},
@@ -61,8 +63,9 @@
 				"rotate": [ 0.0, 0.0, -20.0 ],
 				"scale": [ 1.0, 1.0, 1.0 ]
 			},
-			"sprite": {
+			"model": {
 				"color": [ 1.0, 1.0, 1.0, 1.0 ],
+				"model": "assets/model/quad.obj",
 				"texture": "assets/gfx/test-inverted.png"
 			},
 			"children": [
@@ -74,8 +77,9 @@
 						"rotate": [ 0.0, 0.0, 0.0 ],
 						"scale": [ 0.5, 0.5, 1.0 ]
 					},
-					"sprite": {
+					"model": {
 						"color": [ 1.0, 1.0, 1.0, 1.0 ],
+						"model": "assets/model/quad.obj",
 						"texture": "assets/gfx/test-inverted.png"
 					},
 					"children": [
@@ -87,8 +91,9 @@
 								"rotate": [ 0.0, 0.0, -20.0 ],
 								"scale": [ 0.5, 0.5, 1.0 ]
 							},
-							"sprite": {
+							"model": {
 								"color": [ 1.0, 1.0, 1.0, 1.0 ],
+								"model": "assets/model/quad.obj",
 								"texture": "assets/gfx/test-inverted.png"
 							}
 						}

src/inferno/component/model-component.cpp

@@ -8,6 +8,7 @@
 #include "inferno/asset/asset-manager.h"
 #include "inferno/asset/model.h"
 #include "inferno/asset/texture.h"
+#include "inferno/component/spritecomponent.h" // TODO: Move glm::x toJson/fromJson to separate file
 
 namespace Inferno {
 
@@ -15,6 +16,9 @@ void fromJson(const ruc::Json& json, ModelComponent& value)
 {
 	VERIFY(json.type() == ruc::Json::Type::Object);
 
+	if (json.exists("color")) {
+		json.at("color").getTo(value.color);
+	}
 	if (json.exists("model") && json.at("model").type() == ruc::Json::Type::String) {
 		value.model = AssetManager::the().load<Model>(json.at("model").asString());
 	}

src/inferno/component/model-component.h

@@ -16,6 +16,7 @@
 namespace Inferno {
 
 struct ModelComponent {
+	glm::vec4 color { 1.0f };
 	std::shared_ptr<Model> model;
 	std::shared_ptr<Texture2D> texture;
 };

src/inferno/render/renderer.cpp

@@ -8,6 +8,7 @@
 #include <span>
 
 #include "glad/glad.h"
+#include "glm/ext/vector_float4.hpp" // glm::vec4
 #include "ruc/format/log.h"
 
 #include "inferno/asset/asset-manager.h"
@@ -274,7 +275,7 @@ void Renderer2D::drawQuad(const TransformComponent& transform, glm::mat4 color,
 
 void Renderer2D::loadShader()
 {
-	m_shader = AssetManager::the().load<Shader>("assets/glsl/batch-quad");
+	m_shader = AssetManager::the().load<Shader>("assets/glsl/batch-2d");
 }
 
 // -----------------------------------------
@@ -487,6 +488,7 @@ Renderer3D::Renderer3D(s)
 	vertexBuffer->setLayout({
 		{ BufferElementType::Vec3, "a_position" },
 		{ BufferElementType::Vec3, "a_normal" },
+		{ BufferElementType::Vec4, "a_color" },
 		{ BufferElementType::Vec2, "a_textureCoordinates" },
 		{ BufferElementType::Uint, "a_textureIndex" },
 	});
@@ -495,7 +497,7 @@ Renderer3D::Renderer3D(s)
 	ruc::info("Renderer3D initialized");
 }
 
-void Renderer3D::drawModel(std::span<const Vertex> vertices, std::span<const uint32_t> elements, const TransformComponent& transform, std::shared_ptr<Texture> texture)
+void Renderer3D::drawModel(std::span<const Vertex> vertices, std::span<const uint32_t> elements, const TransformComponent& transform, glm::vec4 color, std::shared_ptr<Texture> texture)
 {
 	// ruc::error("drawModel");
 
@@ -513,6 +515,7 @@ void Renderer3D::drawModel(std::span<const Vertex> vertices, std::span<const uin
 	for (const auto& vertex : vertices) {
 		m_vertexBufferPtr->position = transform.transform * glm::vec4(vertex.position, 1.0f);
 		m_vertexBufferPtr->normal = vertex.normal;
+		m_vertexBufferPtr->color = color;
 		m_vertexBufferPtr->textureCoordinates = vertex.textureCoordinates;
 		m_vertexBufferPtr->textureIndex = textureUnitIndex;
 		m_vertexBufferPtr++;

src/inferno/render/renderer.h

@@ -24,16 +24,16 @@ class TransformComponent;
 class VertexArray;
 
 struct QuadVertex {
-	glm::vec3 position { 0.0f, 0.0f, 0.0f };
-	glm::vec4 color { 1.0f, 1.0f, 1.0f, 1.0f };
-	glm::vec2 textureCoordinates { 0.0f, 0.0f };
-	uint32_t textureIndex = 0;
+	glm::vec3 position { 0.0f };
+	glm::vec4 color { 1.0f };
+	glm::vec2 textureCoordinates { 0.0f };
+	uint32_t textureIndex { 0 };
 };
 
 struct CubemapVertex {
-	glm::vec3 position { 0.0f, 0.0f, 0.0f };
-	glm::vec4 color { 1.0f, 1.0f, 1.0f, 1.0f };
-	uint32_t textureIndex = 0;
+	glm::vec3 position { 0.0f };
+	glm::vec4 color { 1.0f };
+	uint32_t textureIndex { 0 };
 };
 
 struct SymbolVertex {
@@ -45,16 +45,17 @@ struct SymbolVertex {
 	// Outline
 	float borderWidth = 0.7f;
 	float borderEdge = 0.1f;
-	glm::vec4 borderColor { 1.0f, 1.0f, 1.0f, 1.0f };
+	glm::vec4 borderColor { 1.0f };
 	// Dropshadow
 	float offset = 0.0f;
 };
 
 struct Vertex {
-	glm::vec3 position { 0.0f, 0.0f, 0.0f };
-	glm::vec3 normal { 1.0f, 1.0f, 1.0f };
-	glm::vec2 textureCoordinates { 0.0f, 0.0f };
-	uint32_t textureIndex = 0;
+	glm::vec3 position { 0.0f };
+	glm::vec3 normal { 1.0f };
+	glm::vec4 color { 1.0f };
+	glm::vec2 textureCoordinates { 0.0f };
+	uint32_t textureIndex { 0 };
 };
 
 // -------------------------------------
@@ -197,7 +198,7 @@ public:
 
 	using Singleton<Renderer3D>::destroy;
 
-	void drawModel(std::span<const Vertex> vertices, std::span<const uint32_t> indices, const TransformComponent& transform, std::shared_ptr<Texture> texture);
+	void drawModel(std::span<const Vertex> vertices, std::span<const uint32_t> indices, const TransformComponent& transform, glm::vec4 color, std::shared_ptr<Texture> texture);
 
 private:
 	void createElementBuffer() override;

src/inferno/system/rendersystem.cpp

@@ -46,6 +46,7 @@ void RenderSystem::render()
 		Renderer3D::the().drawModel(model.model->vertices(),
 		                            model.model->elements(),
 		                            transform,
+		                            model.color,
 		                            model.model->texture() ? model.model->texture() : model.texture);
 	}
 }