From 1f4d42ab4ccec4be2df0fe70280ac99bc7435333 Mon Sep 17 00:00:00 2001
From: gered <gered@blarg.ca>
Date: Sun, 27 Oct 2013 17:35:07 -0400
Subject: [PATCH] add DebugShader which DebugGeometryRenderer now uses

rendering larger points not implemented yet, need to do a second-pass
render over the points generated in end(), but ImmediateModeRenderer
doesn't allow for this, short of using it to generate the list of
vertices twice
---
 .../gdx/graphics/DebugGeometryRenderer.java   |  3 +-
 .../gdx/graphics/shaders/DebugShader.java     | 36 +++++++++++++++++++
 2 files changed, 38 insertions(+), 1 deletion(-)
 create mode 100644 src/com/blarg/gdx/graphics/shaders/DebugShader.java

diff --git a/src/com/blarg/gdx/graphics/DebugGeometryRenderer.java b/src/com/blarg/gdx/graphics/DebugGeometryRenderer.java
index eef89ee..44ec806 100644
--- a/src/com/blarg/gdx/graphics/DebugGeometryRenderer.java
+++ b/src/com/blarg/gdx/graphics/DebugGeometryRenderer.java
@@ -12,6 +12,7 @@ import com.badlogic.gdx.math.collision.BoundingBox;
 import com.badlogic.gdx.math.collision.Ray;
 import com.badlogic.gdx.math.collision.Segment;
 import com.badlogic.gdx.math.collision.Sphere;
+import com.blarg.gdx.graphics.shaders.DebugShader;
 
 /**
  * Similar idea to {@link com.badlogic.gdx.graphics.glutils.ShapeRenderer}, but provides more convenient methods to
@@ -34,7 +35,7 @@ public class DebugGeometryRenderer {
 
 	public DebugGeometryRenderer() {
 		if (Gdx.graphics.isGL20Available())
-			renderer = new ImmediateModeRenderer20(false, true, 0);
+			renderer = new ImmediateModeRenderer20(5000, false, true, 0, new DebugShader());
 		else
 			renderer = new ImmediateModeRenderer10();
 	}
diff --git a/src/com/blarg/gdx/graphics/shaders/DebugShader.java b/src/com/blarg/gdx/graphics/shaders/DebugShader.java
new file mode 100644
index 0000000..0b589eb
--- /dev/null
+++ b/src/com/blarg/gdx/graphics/shaders/DebugShader.java
@@ -0,0 +1,36 @@
+package com.blarg.gdx.graphics.shaders;
+
+import com.badlogic.gdx.graphics.glutils.ShaderProgram;
+
+public class DebugShader extends ShaderProgram {
+	public static final String VERTEX_SHADER =
+			"attribute vec4 a_position;\n" +
+			"attribute vec4 a_color;\n" +
+			"uniform mat4 u_projModelView;\n" +
+			"varying vec4 v_color;\n" +
+			"\n" +
+			"void main()\n" +
+			"{\n" +
+			"    v_color = a_color;\n" +
+			"    gl_PointSize = 4.0;\n" +
+			"    gl_Position =  u_projModelView * a_position;\n" +
+			"}";
+
+	public static final String FRAGMENT_SHADER =
+			"#ifdef GL_ES\n" +
+			"    #define LOWP lowp\n" +
+			"    precision mediump float;\n" +
+			"#else\n" +
+			"    #define LOWP\n" +
+			"#endif\n" +
+			"varying LOWP vec4 v_color;\n" +
+			"\n" +
+			"void main()\n" +
+			"{\n" +
+			"    gl_FragColor = v_color;\n" +
+			"}\n";
+
+	public DebugShader() {
+		super(VERTEX_SHADER, FRAGMENT_SHADER);
+	}
+}