Initial OpenGL Core port

core/renderer/renderer.cpp

@@ -0,0 +1,5 @@
+#include "renderer.hpp"
+
+namespace hibis {
+	Renderer::Renderer(LoggerCallback logger) : mLogger(logger) {}
+}

core/renderer/renderer.hpp

@@ -5,19 +5,23 @@
 #include "../math/types.hpp"
 #include "../resources/resource.hpp"
 #include "../resources/texture.hpp"
+#include "../resources/shader.hpp"
 #include "../callback.hpp"
 
 namespace hibis {
 	class Renderer {
 	public:
-		Renderer(LoggerCallback logger) : mLogger(logger) {}
+		Renderer(LoggerCallback logger);
 
 		// Draw
 		virtual void clearScreen(Color col) = 0;
 		virtual void renderCurrent() = 0;
 
 		virtual void drawText(Resource* resource, std::string text, IntVec2 pos, Color color) = 0;
-		virtual void drawTexture(Texture* resource, float scale, IntVec2 pos) = 0;
+		virtual void drawTexture(Texture* resource, IntRect size) = 0;
+
+		virtual void useShader(Shader* shader, Point2D points[3]) = 0;
+		virtual void stopUsingShaders() = 0;
 
 		// Pre and Post draw
 		virtual void preDraw() = 0;
@@ -27,10 +31,13 @@ namespace hibis {
 		virtual void update() = 0;
 
 		// Util
+		virtual void compileShader(Shader* shader) = 0;
+		virtual void toggleWireframe() = 0;
 		virtual void setWindowTitle(std::string title) = 0;
 
 		bool mKeepOpen = true;
 	protected:
 		LoggerCallback mLogger;
+		bool mIsWireframeMode = false;
 	};
 }

core/resources/shader.cpp

@@ -0,0 +1,10 @@
+#include "shader.hpp"
+
+namespace hibis {
+	Shader::Shader(std::string vertexShaderPath, std::string fragShaderPath) {
+		mShaderPaths[0] = vertexShaderPath;
+		mShaderPaths[1] = fragShaderPath;
+	}
+
+	Shader::~Shader() {}
+}

core/resources/shader.hpp

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <string>
+
+#include "resource.hpp"
+
+namespace hibis {
+	class Shader : public Resource {
+	public:
+		Shader(std::string vertexShaderPath, std::string fragShaderPath);
+		~Shader();
+		// Vertex then Frag shader
+		unsigned int mShaderIDs[2] = {0, 0};
+		unsigned int mShaderProgram = 0;
+		unsigned int mShaderVAO = 0;
+		unsigned int mShaderVBO = 0;
+
+		std::string mShaderPaths[2];
+	};
+}

core/resources/texture.cpp

@@ -1,20 +1,14 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include <stb_image/stb_image.h>
+
 #include "texture.hpp"
 
 namespace hibis {
-	Texture::Texture(char* path) : mData(), mImageWidth(0), mImageHeight(0), mBuffer() {
+	Texture::Texture(const char* path) : mData(), mImageWidth(0), mImageHeight(0), mImageChannels(0) {
-		unsigned int error = lodepng::load_file(mBuffer, path);
+		mData = stbi_load(path, &mImageWidth, &mImageHeight, &mImageChannels, 0);
-		if (error) {
-			TODO("error message")
-			return;
 	}
 
-		error = lodepng::decode(mData, mImageWidth, mImageHeight, mBuffer);
+	Texture::~Texture() {
-
+		stbi_image_free(mData);
-		if (error) {
-			TODO("error message")
-			return;
 	}
 }
-
-	Texture::~Texture() {}
-}

core/resources/texture.hpp

@@ -2,8 +2,6 @@
 
 #include <vector>
 
-#include <lodepng/lodepng.h>
-
 #include "resource.hpp"
 #include "../pragmautil.hpp"
 
@@ -11,11 +9,9 @@ namespace hibis {
 	TODO("Make this function")
 	class Texture : Resource {
 	public:
-		Texture(char* path);
+		Texture(const char* path);
 		~Texture();
-		std::vector<unsigned char> mData;
+		unsigned char* mData;
-		unsigned int mImageWidth, mImageHeight;
+		int mImageWidth, mImageHeight, mImageChannels;
-	private:
-		std::vector<unsigned char> mBuffer;
 	};
 }

meson.build

@@ -12,8 +12,9 @@ include_dirs = include_directories('./external')
 
 # Files
 libhibis_src_core = files('core/engine/engine.cpp')
-libhibis_src_resources = files('core/resources/texture.cpp', 'core/resources/font.cpp')
+libhibis_src_renderer = files('core/renderer/renderer.cpp')
-libhibis_src = [libhibis_src_core, libhibis_src_resources]
+libhibis_src_resources = files('core/resources/texture.cpp', 'core/resources/font.cpp', 'core/resources/shader.cpp')
+libhibis_src = [libhibis_src_core, libhibis_src_renderer, libhibis_src_resources]
 
 libhibis_rglcore_src = files('renderer/rglcore/rglcore.cpp')
 libhibis_test_src = files('test/app.cpp')
@@ -24,9 +25,8 @@ libglfw = dependency('glfw3')
 libglew = dependency('GLEW')
 libfmt = dependency('fmt')
 libfreetype2 = dependency('freetype2')
-liblodepng = static_library('lodepng', 'external/lodepng/lodepng.cpp')
 
 # Compile
-libhibis = library('hibis', libhibis_src, include_directories: include_dirs, link_with: liblodepng, dependencies: [libfreetype2])
+libhibis = library('hibis', libhibis_src, include_directories: include_dirs, dependencies: [libfreetype2])
 libhibis_rglcore = library('hibis_rglcore', libhibis_rglcore_src, include_directories: [include_dirs, './core'], link_with: libhibis, dependencies: [libfreetype2, libgl, libglfw, libglew, libfmt])
 hibistest = executable('hibistest.exec', libhibis_test_src, include_directories: [include_dirs, './core', './renderer/rglcore'], link_with: [libhibis, libhibis_rglcore], dependencies: [libfreetype2, libgl, libglfw, libglew, libfmt])

renderer/rglcore/rglcore.cpp

@@ -1,9 +1,10 @@
 #include <fmt/format.h>
+#include <fstream>
 
 #include "rglcore.hpp"
 
 namespace hibis::rglcore {
-	RGLCore::RGLCore(std::string title, IntVec2 size, LoggerCallback callback) : Renderer(callback) {
+	RGLCore::RGLCore(std::string title, IntVec2 size, LoggerCallback callback) : Renderer(callback), mTextures() {
 		mLogger(Information, "Preparing GLFW3...");
 		if (!glfwInit()) {
 			mLogger(Fatal, "GLFW couldn't be initialised!");
@@ -54,7 +55,49 @@ namespace hibis::rglcore {
 	}
 
 	void RGLCore::drawText(Resource* resource, std::string text, IntVec2 pos, Color color) {}
-	void RGLCore::drawTexture(Texture* resource, float scale, IntVec2 pos) {}
+	void RGLCore::drawTexture(Texture* resource, IntRect size) {
+		TODO("finish this")
+		return;
+		unsigned int glTextureID;
+		if (mTextures.find(resource) != mTextures.end()) {
+			glTextureID = mTextures[resource];
+		} else {
+			glGenTextures(1, &glTextureID);
+			glBindTexture(GL_TEXTURE_2D, glTextureID);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+			glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, resource->mImageWidth, resource->mImageHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, resource->mData);
+			glGenerateMipmap(GL_TEXTURE_2D);
+		}
+	}
+
+	void RGLCore::useShader(Shader* shader, Point2D points[3]) {
+		float vertices[] = {
+			points[0].x, points[0].y, 0.0f,
+			points[1].x, points[1].y, 0.0f,
+			points[2].x, points[2].y, 0.0f
+		};
+		if (shader->mShaderVAO == 0) {
+			glGenVertexArrays(1, &shader->mShaderVAO);
+			glBindVertexArray(shader->mShaderVAO);
+			glBindBuffer(GL_ARRAY_BUFFER, shader->mShaderVBO);
+			glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+			glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+			glEnableVertexAttribArray(0);
+		}
+
+		glUseProgram(shader->mShaderProgram);
+		glBindVertexArray(shader->mShaderVAO);
+		glDrawArrays(GL_TRIANGLES, 0, 3);
+	}
+
+	void RGLCore::stopUsingShaders() {
+		glUseProgram(0);
+	}
 
 	// Pre and Post draw
 	void RGLCore::preDraw() {}
@@ -65,7 +108,63 @@ namespace hibis::rglcore {
 		glfwPollEvents();
 	}
 
+	void RGLCore::compileShader(Shader* shader) {
+		if (shader->mShaderProgram != 0) return;
+		mLogger(Information, fmt::format("Compiling shader {}", shader->mShaderPaths[0]));
+		glGenBuffers(1, &shader->mShaderVBO);
+		glBindBuffer(GL_ARRAY_BUFFER, shader->mShaderVBO);
+		shader->mShaderIDs[0] = glCreateShader(GL_VERTEX_SHADER);
+		const char* vertShader = loadFile(shader->mShaderPaths[0]);
+		glShaderSource(shader->mShaderIDs[0], 1, &vertShader, NULL);
+		glCompileShader(shader->mShaderIDs[0]);
+
+		mLogger(Information, fmt::format("Compiling shader {}", shader->mShaderPaths[1]));
+
+		shader->mShaderIDs[1] = glCreateShader(GL_VERTEX_SHADER);
+		const char* fragShader = loadFile(shader->mShaderPaths[1]);
+		glShaderSource(shader->mShaderIDs[1], 1, &fragShader, NULL);
+		glCompileShader(shader->mShaderIDs[1]);
+
+		shader->mShaderProgram = glCreateProgram();
+
+		glAttachShader(shader->mShaderProgram, shader->mShaderIDs[0]);
+		glAttachShader(shader->mShaderProgram, shader->mShaderIDs[1]);
+
+		glLinkProgram(shader->mShaderProgram);
+
+		mLogger(Information, "Linked shader.");
+
+		glDeleteShader(shader->mShaderIDs[0]);
+		glDeleteShader(shader->mShaderIDs[1]);
+
+		mLogger(Information, "Cleaned up leftover shader objects.");
+	}
+
+	void RGLCore::toggleWireframe() {
+		if (mIsWireframeMode) glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+		else glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+		mIsWireframeMode = !mIsWireframeMode;
+	}
+
 	void RGLCore::setWindowTitle(std::string title) {
 		glfwSetWindowTitle(mWindow, title.c_str());
 	}
+
+	const char* RGLCore::loadFile(std::string path) {
+		std::string text, line;
+		std::ifstream textFile(path);
+		if (textFile.is_open()) {
+			while (getline(textFile, line)) {
+				text += line + '\n';
+			}
+			textFile.close();
+		} else {
+			text = "";
+			mLogger(Error, fmt::format("Couldn't load file '{}'", path));
+		}
+
+		const char* textChar = text.c_str();
+
+		return textChar;
+	}
 }

renderer/rglcore/rglcore.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <unordered_map>
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
 
@@ -16,11 +17,14 @@ namespace hibis::rglcore {
 		~RGLCore();
 
 		// Draw
-		void clearScreen(Color col) override;
+		void clearScreen(Color col = Color {0, 0, 0, 255}) override;
 		void renderCurrent() override;
 
 		void drawText(Resource* resource, std::string text, IntVec2 pos, Color color) override;
-		void drawTexture(Texture* resource, float scale, IntVec2 pos) override;
+		void drawTexture(Texture* resource, IntRect size) override;
+
+		void useShader(Shader* shader, Point2D points[3]) override;
+		void stopUsingShaders() override;
 
 		// Pre and Post draw
 		void preDraw() override;
@@ -30,8 +34,13 @@ namespace hibis::rglcore {
 		void update() override;
 
 		// Util
+		void compileShader(Shader* shader) override;
+		void toggleWireframe() override;
 		void setWindowTitle(std::string title) override;
 	private:
 		GLFWwindow* mWindow;
+		std::unordered_map<Texture*, unsigned int> mTextures;
+
+		const char* loadFile(std::string path);
 	};
 }

test/app.cpp

@@ -44,16 +44,19 @@ void logger(LoggingSeverity severity, std::string message) {
 }
 
 int main() {
+	logger(Information, fmt::format("PWD: {}", std::getenv("PWD")));
 	RGLCore renderer = RGLCore("test", IntVec2 {800, 600}, &logger);
 	Engine engine = Engine(&renderer, &logger);
 
 #ifdef _WIN32
-	Font font = Font("C:\\Windows\\Fonts\\Arial.ttf", 16);
+	Font font = Font(engine.mFreeTypeLibrary, "C:\\Windows\\Fonts\\Arial.ttf", 16);
 #else
 	Font font = Font(engine.mFreeTypeLibrary, "/usr/share/fonts/noto/NotoSans-Light.ttf", 16);
 #endif
 
 	Texture image = Texture((char*)"test.png");
+	Shader shader = Shader("../test/test.vert", "../test/test.frag");
+	renderer.compileShader(&shader);
 
 	uint8_t red = 0;
 	bool increaseRed = true;
@@ -61,6 +64,8 @@ int main() {
 	uint size = 16;
 	uint f = 0;
 
+	Point2D points[3] = {{-0.5f, -0.5f}, {0.5f, -0.5f}, {0.0f, 0.5f}};
+
 	logger(Information, "Started Hibis test app! BEHOLD: Colours.");
 	while (renderer.mKeepOpen) {
 		engine.runNodeProcesses();
@@ -85,8 +90,9 @@ int main() {
 
 		// Clear screen then sleep for ~16ms
 		renderer.clearScreen(Color {red, 0, 0, 255});
-		renderer.drawText(&font, "Testing Text", IntVec2 {0, 0}, Color {255, 255, 255, 255});
+		renderer.useShader(&shader, points);
-		renderer.drawTexture(&image, 1.0f, IntVec2 {10, 10});
+		//renderer.drawText(&font, "Testing Text", IntVec2 {0, 0}, Color {255, 255, 255, 255});
+		//renderer.drawTexture(&image, 1.0f, IntVec2 {10, 10});
 
 		engine.drawNodes();
 		renderer.renderCurrent();

test/test.frag

@@ -0,0 +1,6 @@
+#version 330 core
+out vec4 FragColor;
+
+void main() {
+	FragColor = vec4(1.0f, 0.5f, 0.2f, 1.0f);
+} 

test/test.vert

@@ -0,0 +1,6 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+
+void main() {
+	gl_Position = vec4(aPos.x, aPos.y, aPos.z, 1.0);
+}