From 438c49971832a6756c6097068902a6518a90271f Mon Sep 17 00:00:00 2001
From: Shyotl <Shyotl@gmail.com>
Date: Wed, 19 Sep 2012 15:06:34 -0500
Subject: [PATCH] And the shader..

---
 .../shaders/class1/effects/MotionBlurF.glsl   | 55 +++++++++++++++++++
 indra/newview/llviewershadermgr.cpp           | 21 +++++++
 2 files changed, 76 insertions(+)
 create mode 100644 indra/newview/app_settings/shaders/class1/effects/MotionBlurF.glsl

diff --git a/indra/newview/app_settings/shaders/class1/effects/MotionBlurF.glsl b/indra/newview/app_settings/shaders/class1/effects/MotionBlurF.glsl
new file mode 100644
index 000000000..89aaa8f10
--- /dev/null
+++ b/indra/newview/app_settings/shaders/class1/effects/MotionBlurF.glsl
@@ -0,0 +1,55 @@
+/**
+ * @file colorFilterF.glsl
+ *
+ * Copyright (c) 2007-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+ 
+#extension GL_ARB_texture_rectangle : enable
+ 
+#ifdef DEFINE_GL_FRAGCOLOR
+out vec4 frag_color;
+#else
+#define frag_color gl_FragColor
+#endif
+
+uniform sampler2DRect tex0;
+uniform sampler2DRect tex1;
+uniform mat4 inv_proj;
+uniform mat4 prev_proj;
+uniform vec2 screen_res;
+uniform int blur_strength;
+
+VARYING vec2 vary_texcoord0;
+
+#define SAMPLE_COUNT 10
+
+vec4 getPosition(vec2 pos_screen, out vec4 ndc)
+{
+	float depth = texture2DRect(tex1, pos_screen.xy).r;
+	vec2 sc = pos_screen.xy*2.0;
+	sc /= screen_res;
+	sc -= vec2(1.0,1.0);
+	ndc = vec4(sc.x, sc.y, 2.0*depth-1.0, 1.0);
+	vec4 pos = inv_proj * ndc;
+	pos /= pos.w;
+	pos.w = 1.0;
+	return pos;
+}
+
+void main(void) 
+{
+	vec4 ndc;
+	vec4 pos = getPosition(vary_texcoord0,ndc);
+	vec4 prev_pos = prev_proj * pos;
+	prev_pos/=prev_pos.w;
+	prev_pos.w = 1.0;
+	vec2 vel = ((ndc.xy-prev_pos.xy) * .5) * screen_res * .001 * blur_strength;
+	vec3 color = texture2DRect(tex0, vary_texcoord0.st).rgb; 
+	vec2 texcoord = vary_texcoord0 + vel;
+	for(int i = 1; i < SAMPLE_COUNT; ++i, texcoord += vel)  
+	{  
+		color += texture2DRect(tex0, texcoord.st).rgb; 
+	}
+	frag_color = vec4(color / SAMPLE_COUNT, 1.0);
+}
diff --git a/indra/newview/llviewershadermgr.cpp b/indra/newview/llviewershadermgr.cpp
index 356cc6cac..25014b640 100644
--- a/indra/newview/llviewershadermgr.cpp
+++ b/indra/newview/llviewershadermgr.cpp
@@ -171,6 +171,7 @@ LLGLSLShader			gPostColorFilterProgram(LLViewerShaderMgr::SHADER_EFFECT);	//Not
 LLGLSLShader			gPostNightVisionProgram(LLViewerShaderMgr::SHADER_EFFECT);	//Not in mShaderList
 LLGLSLShader			gPostGaussianBlurProgram(LLViewerShaderMgr::SHADER_EFFECT);	//Not in mShaderList
 LLGLSLShader			gPostPosterizeProgram(LLViewerShaderMgr::SHADER_EFFECT);	//Not in mShaderList
+LLGLSLShader			gPostMotionBlurProgram(LLViewerShaderMgr::SHADER_EFFECT);	//Not in mShaderList
  
  // Deferred rendering shaders
 LLGLSLShader			gDeferredImpostorProgram(LLViewerShaderMgr::SHADER_DEFERRED);
@@ -977,6 +978,26 @@ BOOL LLViewerShaderMgr::loadShadersEffects()
 			gPostPosterizeProgram.uniform1i("tex0", 0);
 		}
 	}
+
+	{
+		vector<string> shaderUniforms;
+		shaderUniforms.reserve(3);
+		shaderUniforms.push_back("inv_proj");
+		shaderUniforms.push_back("prev_proj");
+		shaderUniforms.push_back("screen_res");
+
+		gPostMotionBlurProgram.mName = "Motion Blur Shader (Post)";
+		gPostMotionBlurProgram.mShaderFiles.clear();
+		gPostMotionBlurProgram.mShaderFiles.push_back(make_pair("effects/MotionBlurF.glsl", GL_FRAGMENT_SHADER_ARB));
+		gPostMotionBlurProgram.mShaderFiles.push_back(make_pair("interface/onetexturenocolorV.glsl", GL_VERTEX_SHADER_ARB));
+		gPostMotionBlurProgram.mShaderLevel = mVertexShaderLevel[SHADER_EFFECT];
+		if(gPostMotionBlurProgram.createShader(NULL, &shaderUniforms))
+		{
+			gPostMotionBlurProgram.bind();
+			gPostMotionBlurProgram.uniform1i("tex0", 0);
+			gPostMotionBlurProgram.uniform1i("tex1", 1);
+		}
+	}
 	#endif
 
 	return success;