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package net.tylermurphy.Minecraft.Render;
import java.util.List;
import java.util.Map;
import net.tylermurphy.Minecraft.Render.Data.Mesh;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL13;
import org.lwjgl.opengl.GL20;
import org.lwjgl.opengl.GL30;
import org.joml.Matrix4f;
import org.joml.Vector2f;
import org.joml.Vector4f;
import net.tylermurphy.Minecraft.Render.Shaders.FontShader;
import net.tylermurphy.Minecraft.Render.Shaders.QuadShader;
import net.tylermurphy.Minecraft.UI.UIFont;
import net.tylermurphy.Minecraft.UI.UIText;
import net.tylermurphy.Minecraft.Util.Maths;
public class FontRenderer {
private final Mesh quad;
private final FontShader fontShader;
private final QuadShader quadShader;
public FontRenderer() {
float[] positions = {-1, 1, -1, -1, 1, 1, 1, -1};
quad = new Mesh(positions.length/2).store(positions, 2).finish();
fontShader = new FontShader();
quadShader = new QuadShader();
}
public void render(Map<UIFont, List<UIText>> texts){
for(UIFont font : texts.keySet()){
for(UIText text : texts.get(font)){
renderQuad(text);
}
}
prepare();
for(UIFont font : texts.keySet()){
GL13.glActiveTexture(GL13.GL_TEXTURE0);
GL11.glBindTexture(GL11.GL_TEXTURE_2D, font.getTextureAtlas());
for(UIText text : texts.get(font)){
renderText(text);
}
}
endRendering();
}
public void cleanUp(){
fontShader.cleanUp();
quadShader.cleanUp();
}
private void prepare(){
GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glDisable(GL11.GL_DEPTH_TEST);
fontShader.start();
}
private void renderText(UIText text){
GL30.glBindVertexArray(text.getMesh());
GL20.glEnableVertexAttribArray(0);
GL20.glEnableVertexAttribArray(1);
fontShader.loadColor(text.getColour());
fontShader.loadTranslation(text.getConvertedPosition());
GL11.glDrawArrays(GL11.GL_TRIANGLES, 0, text.getVertexCount());
GL20.glDisableVertexAttribArray(0);
GL20.glDisableVertexAttribArray(1);
GL30.glBindVertexArray(0);
}
private void renderQuad(UIText text) {
quadShader.start();
GL30.glBindVertexArray(quad.getID());
GL20.glEnableVertexAttribArray(0);
GL11.glEnable(GL11.GL_BLEND);
GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
GL11.glDisable(GL11.GL_DEPTH_TEST);
Matrix4f matrix = Maths.createTransformationMatrix(new Vector2f(text.getStretchBackdrop() ? -1 : text.getConvertedPosition().x*2-1,(1-text.getConvertedPosition().y-.0125f*text.getFontSize()-.0025f)*2-1), new Vector2f(text.getStretchBackdrop() ? 2 : (float) text.getMaxX()*2,.025f*text.getFontSize()));
quadShader.loadTransformation(matrix);
quadShader.loadColor(new Vector4f(150/255f,150/255f,150/255f,.5f));
GL11.glDrawArrays(GL11.GL_TRIANGLE_STRIP, 0, quad.getVertexCount());
GL11.glEnable(GL11.GL_DEPTH_TEST);
GL20.glDisableVertexAttribArray(0);
GL30.glBindVertexArray(0);
quadShader.stop();
GL11.glDisable(GL11.GL_BLEND);
GL11.glEnable(GL11.GL_DEPTH_TEST);
}
private void endRendering(){
fontShader.stop();
GL11.glDisable(GL11.GL_BLEND);
GL11.glEnable(GL11.GL_DEPTH_TEST);
}
}
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