basic font rendering implemented, and alpha blending

Test.java

@@ -7,9 +7,10 @@ public class Test {
 		var img = engine.loadImage("C:\\Users\\dani\\Videos\\Screenshot 2022-06-25 17-00-59.png");
 		var tex2 = window.loadTexture("C:\\art\\pixel stuff.png");
 		var tileset = window.loadTextureArray("C:\\stream\\coding\\rlc\\tilemap.png", new Vec2i(16, 16));
+		var font = window.loadFontTileset("EGA8x14.png");
 		//img.drawImage(img2, Vec2i.ZERO);
 		var tex = window.loadTexture(img);
-		window.setDebug(true);
+		window.setDebug(false);
 
 		while(!window.shouldClose()) {
 			window.tick();
@@ -27,6 +28,8 @@ public class Test {
 				new Recti(new Vec2i(400, 400), new Vec2i(16, 16)),
 				tileset.get(0x30)
 			);
+
+			renderContext.drawString(new Vec2i(100, 100), "hello world mew", font);
 			window.renderFinish(renderContext);
 		}
 	}

com/danitheskunk/skunkworks/BaseRenderContext.java

@@ -0,0 +1,24 @@
+package com.danitheskunk.skunkworks;
+
+import java.io.UnsupportedEncodingException;
+import java.nio.ByteBuffer;
+import java.nio.IntBuffer;
+
+abstract class BaseRenderContext implements IRenderContext {
+	public void drawString(Vec2i pos, String string, IFont font) {
+		int x = pos.getX();
+		int y = pos.getY();
+		IntBuffer buf;
+		try {
+			buf = ByteBuffer.wrap(string.getBytes("UTF-32")).asIntBuffer();
+		} catch(UnsupportedEncodingException e) {
+			throw new RuntimeException(e);
+		}
+		for(int i = 0; i < string.length(); ++i) {
+			int ch = buf.get(i);
+			var tex = font.getTexture(ch);
+			drawTextureRectangle(new Recti(new Vec2i(x, y), tex.getSize()), tex);
+			x += font.getCharWidth(ch);
+		}
+	}
+}

com/danitheskunk/skunkworks/BaseWindow.java

@@ -0,0 +1,17 @@
+package com.danitheskunk.skunkworks;
+
+abstract class BaseWindow implements IWindow {
+	protected final Engine engine;
+
+	BaseWindow(Engine engine) {
+		this.engine = engine;
+	}
+
+	public IFont loadFontTileset(String path) {
+		var img = engine.loadImage(path);
+		var charSize = Vec2i.div(img.getSize(), 16);
+		var tex = loadTextureArray(img, charSize);
+		assert tex.size() == 256;
+		return new FontTileset(tex);
+	}
+}

com/danitheskunk/skunkworks/FontTileset.java

@@ -0,0 +1,31 @@
+package com.danitheskunk.skunkworks;
+
+import java.util.List;
+
+class FontTileset implements IFont {
+	private List<ITexture> textures;
+	private Vec2i charSize;
+
+	FontTileset(List<ITexture> textures) {
+		this.textures = textures;
+		this.charSize = textures.get(0).getSize();
+	}
+
+	@Override
+	public int getCharWidth(int ch) {
+		return charSize.getX();
+	}
+
+	@Override
+	public int getLineHeight(int ch) {
+		return charSize.getY();
+	}
+
+	@Override
+	public ITexture getTexture(int ch) {
+		if(ch >= 256 || ch < 0) {
+			ch = 0;
+		}
+		return textures.get(ch);
+	}
+}

com/danitheskunk/skunkworks/GLRenderContext.java

@@ -2,7 +2,7 @@ package com.danitheskunk.skunkworks;
 
 import static org.lwjgl.opengl.GL11.*;
 
-class GLRenderContext implements IRenderContext{
+class GLRenderContext extends BaseRenderContext implements IRenderContext{
 	private final GLTextureAtlas atlas;
 
 	public GLRenderContext(GLTextureAtlas atlas) {

com/danitheskunk/skunkworks/GLWindow.java

@@ -11,9 +11,8 @@ import static org.lwjgl.glfw.GLFW.*;
 import static org.lwjgl.opengl.GL11.*;
 import static org.lwjgl.system.MemoryUtil.NULL;
 
-class GLWindow implements IWindow {
+class GLWindow extends BaseWindow {
 	private boolean debug;
-	private final Engine engine;
 	private final GLRenderContext renderContext;
 	private boolean shouldClose;
 	private final Vec2i size;
@@ -21,12 +20,12 @@ class GLWindow implements IWindow {
 	private final long window;
 
 	public GLWindow(Vec2i size, String title, Engine engine) {
+		super(engine);
 		GLFWErrorCallback.createPrint(System.err).set();
 		if(!glfwInit()) throw new IllegalStateException("Unable to initialize GLFW");
 
 		glfwDefaultWindowHints();
 		this.debug = false;
-		this.engine = engine;
 		this.size = size;
 
 		window = glfwCreateWindow(size.getX(), size.getY(), title, NULL, NULL);
@@ -42,6 +41,8 @@ class GLWindow implements IWindow {
 		glOrtho(0.0f, size.getX(), size.getY(), 0.0f, 0.0f, 1.0f);
 		glEnable(GL_COLOR);
 		glEnable(GL_TEXTURE_2D);
+		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+		glEnable(GL_BLEND);
 
 		textureAtlas = new GLTextureAtlas();
 		renderContext = new GLRenderContext(textureAtlas);

com/danitheskunk/skunkworks/IFont.java

@@ -0,0 +1,7 @@
+package com.danitheskunk.skunkworks;
+
+public interface IFont {
+	int getCharWidth(int ch);
+	int getLineHeight(int ch);
+	ITexture getTexture(int ch);
+}

com/danitheskunk/skunkworks/IRenderContext.java

@@ -2,6 +2,7 @@ package com.danitheskunk.skunkworks;
 
 public interface IRenderContext {
 	void drawRectangle(Recti rect, Color color);
+	void drawString(Vec2i pos, String string, IFont font);
 	void drawTextureRectangle(Recti rect, ITexture texture);
 	void drawTextureRectangle(Recti rect, ITexture texture, Color color);
 }

com/danitheskunk/skunkworks/IWindow.java

@@ -3,6 +3,7 @@ package com.danitheskunk.skunkworks;
 import java.util.List;
 
 public interface IWindow {
+	IFont loadFontTileset(String path);
 	ITexture loadTexture(Image image);
 	ITexture loadTexture(String path);
 	List<ITexture> loadTextureArray(Image image, Vec2i tileSize);