From f0b87c99abc51d572085e6b6b36a9fd984dffa68 Mon Sep 17 00:00:00 2001
From: Peter Tissen <dravorek@gmail.com>
Date: Thu, 13 Aug 2015 10:46:48 +0200
Subject: [PATCH] Lower GLSL version requirement

I didn't really use any of the newer features anyway.
This should accomodate open source drivers that use older versions of MESA.
---
 src/itdelatrisu/opsu/objects/curves/Curve.java    |  4 ++--
 src/itdelatrisu/opsu/render/CurveRenderState.java | 11 ++++++-----
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/src/itdelatrisu/opsu/objects/curves/Curve.java b/src/itdelatrisu/opsu/objects/curves/Curve.java
index a22c4b29..ad79353a 100644
--- a/src/itdelatrisu/opsu/objects/curves/Curve.java
+++ b/src/itdelatrisu/opsu/objects/curves/Curve.java
@@ -87,12 +87,12 @@ public abstract class Curve {
 		Curve.borderColor = borderColor;
 
 		ContextCapabilities capabilities = GLContext.getCapabilities();
-		mmsliderSupported = capabilities.GL_EXT_framebuffer_object && capabilities.OpenGL33;
+		mmsliderSupported = capabilities.GL_EXT_framebuffer_object && capabilities.OpenGL30;
 		if (mmsliderSupported)
 			CurveRenderState.init(width, height, circleSize);
 		else {
 			if (Options.getSkin().getSliderStyle() != Skin.STYLE_PEPPYSLIDER)
-				Log.warn("New slider style requires FBO support and OpenGL 3.2.");
+				Log.warn("New slider style requires FBO support and OpenGL 3.0.");
 		}
 	}
 
diff --git a/src/itdelatrisu/opsu/render/CurveRenderState.java b/src/itdelatrisu/opsu/render/CurveRenderState.java
index 17a62e56..99a6f384 100644
--- a/src/itdelatrisu/opsu/render/CurveRenderState.java
+++ b/src/itdelatrisu/opsu/render/CurveRenderState.java
@@ -409,10 +409,10 @@ public class CurveRenderState {
 				program = GL20.glCreateProgram();
 				int vtxShdr = GL20.glCreateShader(GL20.GL_VERTEX_SHADER);
 				int frgShdr = GL20.glCreateShader(GL20.GL_FRAGMENT_SHADER);
-				GL20.glShaderSource(vtxShdr, "#version 330\n"
+				GL20.glShaderSource(vtxShdr, "#version 130\n"
 						+ "\n"
-						+ "layout(location = 0) in vec4 in_position;\n"
-						+ "layout(location = 1) in vec2 in_tex_coord;\n"
+						+ "in vec4 in_position;\n"
+						+ "in vec2 in_tex_coord;\n"
 						+ "\n"
 						+ "out vec2 tex_coord;\n"
 						+ "void main()\n"
@@ -426,7 +426,7 @@ public class CurveRenderState {
 					String error = GL20.glGetShaderInfoLog(vtxShdr, 1024);
 					Log.error("Vertex Shader compilation failed.", new Exception(error));
 				}
-				GL20.glShaderSource(frgShdr, "#version 330\n"
+				GL20.glShaderSource(frgShdr, "#version 130\n"
 						+ "\n"
 						+ "uniform sampler1D tex;\n"
 						+ "uniform vec2 tex_size;\n"
@@ -434,7 +434,7 @@ public class CurveRenderState {
 						+ "uniform vec4 col_border;\n"
 						+ "\n"
 						+ "in vec2 tex_coord;\n"
-						+ "layout(location = 0) out vec4 out_colour;\n"
+						+ "out vec4 out_colour;\n"
 						+ "\n"
 						+ "void main()\n"
 						+ "{\n"
@@ -451,6 +451,7 @@ public class CurveRenderState {
 				}
 				GL20.glAttachShader(program, vtxShdr);
 				GL20.glAttachShader(program, frgShdr);
+				GL30.glBindFragDataLocation(program, 0, "out_colour");
 				GL20.glLinkProgram(program);
 				res = GL20.glGetProgrami(program, GL20.GL_LINK_STATUS);
 				if (res != GL11.GL_TRUE) {