From d8cbc7ddd8ccf4f512060aef84e62899d20f0bab Mon Sep 17 00:00:00 2001
From: Anuken <arnukren@gmail.com>
Date: Wed, 14 Nov 2018 10:39:43 -0500
Subject: [PATCH] "point shader"

---
 .../src/io/anuke/mindustry/core/Renderer.java |  8 +-
 .../mindustry/graphics/FloorRenderer.java     | 89 ++++++++++++++++++-
 2 files changed, 89 insertions(+), 8 deletions(-)

diff --git a/core/src/io/anuke/mindustry/core/Renderer.java b/core/src/io/anuke/mindustry/core/Renderer.java
index 4024073c29..53e88afd86 100644
--- a/core/src/io/anuke/mindustry/core/Renderer.java
+++ b/core/src/io/anuke/mindustry/core/Renderer.java
@@ -176,20 +176,18 @@ public class Renderer extends RendererModule{
 
         Graphics.clear(clearColor);
 
-
-        batch.setProjectionMatrix(camera.combined);
-
-       // Graphics.surface(pixelSurface, false);
-        //Graphics.clear(clearColor);
         Draw.scale(scaling);
 
         blocks.floor.drawFloor();
 
+        Graphics.beginCam();
+
         drawAndInterpolate(groundEffectGroup, e -> e instanceof BelowLiquidTrait);
         drawAndInterpolate(puddleGroup);
         drawAndInterpolate(groundEffectGroup, e -> !(e instanceof BelowLiquidTrait));
 
         blocks.processBlocks();
+
         blocks.drawShadows();
 
         for(Team team : Team.all){
diff --git a/core/src/io/anuke/mindustry/graphics/FloorRenderer.java b/core/src/io/anuke/mindustry/graphics/FloorRenderer.java
index 9476ac97aa..21256841ce 100644
--- a/core/src/io/anuke/mindustry/graphics/FloorRenderer.java
+++ b/core/src/io/anuke/mindustry/graphics/FloorRenderer.java
@@ -1,22 +1,105 @@
 package io.anuke.mindustry.graphics;
 
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.graphics.GL20;
+import com.badlogic.gdx.graphics.Mesh;
+import com.badlogic.gdx.graphics.VertexAttribute;
+import com.badlogic.gdx.graphics.VertexAttributes.Usage;
+import com.badlogic.gdx.graphics.g2d.TextureRegion;
+import com.badlogic.gdx.graphics.glutils.ShaderProgram;
 import io.anuke.mindustry.game.EventType.WorldLoadGraphicsEvent;
+import io.anuke.mindustry.world.Tile;
+import io.anuke.mindustry.world.blocks.Floor;
+import io.anuke.ucore.core.Core;
 import io.anuke.ucore.core.Events;
 
-//TODO point shader mesh
+import static io.anuke.mindustry.Vars.world;
+
 public class FloorRenderer{
     private final static int chunksize = 64;
+    private final static int vertexSize = 4;
+    private float[] vertices = new float[vertexSize];
+    private ShaderProgram shader = createDefaultShader();
+    private int length;
+    private Mesh mesh;
 
     public FloorRenderer(){
         Events.on(WorldLoadGraphicsEvent.class, event -> clearTiles());
     }
 
-    /**Draws all the floor in the camera range.*/
+    /**Draws all the floor tiles in the camera range.*/
     public void drawFloor(){
-
+        Gdx.gl.glEnable(GL20.GL_VERTEX_PROGRAM_POINT_SIZE);
+        shader.begin();
+        shader.setUniformMatrix("u_projectionViewMatrix", Core.camera.combined);
+        shader.setUniformi("u_texture", 0);
+        mesh.render(shader, GL20.GL_POINTS, 0, length / vertexSize);
+        shader.end();
     }
+
     /**Clears the mesh and renders the entire world to it.*/
     public void clearTiles(){
+        if(mesh != null){
+            mesh.dispose();
+        }
 
+        int size = world.width() * world.height() * vertexSize;
+
+        length = 0;
+        mesh = new Mesh(true, size, 0,
+            new VertexAttribute(Usage.Position, 2, ShaderProgram.POSITION_ATTRIBUTE),
+            new VertexAttribute(Usage.TextureCoordinates, 2, ShaderProgram.TEXCOORD_ATTRIBUTE + "0"));
+
+        mesh.getVerticesBuffer().position(0);
+        mesh.getVerticesBuffer().limit(mesh.getMaxVertices());
+        cache();
+    }
+
+    private void addSprite(TextureRegion region, float x, float y){
+        vertices[0] = x;
+        vertices[1] = y;
+        vertices[2] = region.getU();
+        vertices[3] = region.getV();
+
+        mesh.getVerticesBuffer().put(vertices);
+        length += vertexSize;
+    }
+
+    private void cache(){
+        for(int x = 0; x < world.width(); x++){
+            for(int y = 0; y < world.height(); y++){
+                Tile tile = world.tile(x, y);
+
+                Floor floor = tile.floor();
+                TextureRegion region = floor.getEditorIcon();
+                addSprite(region, tile.worldx(), tile.worldy());
+            }
+        }
+    }
+
+    static ShaderProgram createDefaultShader () {
+        String vertexShader = "attribute vec4 " + ShaderProgram.POSITION_ATTRIBUTE + ";\n" //
+        + "attribute vec4 " + ShaderProgram.COLOR_ATTRIBUTE + ";\n" //
+        + "attribute vec2 " + ShaderProgram.TEXCOORD_ATTRIBUTE + "0;\n" //
+        //+ "attribute float a_size;\n"
+        + "uniform mat4 u_projectionViewMatrix;\n" //
+        + "varying vec2 v_texCoords;\n" //
+        + "\n" //
+        + "void main(){\n" //
+        + "   v_texCoords = " + ShaderProgram.TEXCOORD_ATTRIBUTE + "0;\n" //
+        + "   gl_Position =  u_projectionViewMatrix * " + ShaderProgram.POSITION_ATTRIBUTE + ";\n" //
+        + "   gl_PointSize = 8.0f;\n"
+        + "}\n";
+        String fragmentShader = "#ifdef GL_ES\n" //
+        + "precision mediump float;\n" //
+        + "#endif\n" //
+        + "varying vec2 v_texCoords;\n" //
+        + "uniform sampler2D u_texture;\n" //
+        + "void main(){\n"//
+        + "  gl_FragColor = texture2D(u_texture, gl_PointCoord);\n" //
+        + "}";
+        ShaderProgram shader = new ShaderProgram(vertexShader, fragmentShader);
+        if (shader.isCompiled() == false) throw new IllegalArgumentException("Error compiling shader: " + shader.getLog());
+        return shader;
     }
 }