Imported glslang library. Refactoring shader manager.

standard_assets/shaders/light_directional_osx.fsh

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+//  Copyright 2012 Kearwood Gilbert. All rights reserved.
+//  
+//  Redistribution and use in source and binary forms, with or without modification, are
+//  permitted provided that the following conditions are met:
+//  
+//  1. Redistributions of source code must retain the above copyright notice, this list of
+//  conditions and the following disclaimer.
+//  
+//  2. Redistributions in binary form must reproduce the above copyright notice, this list
+//  of conditions and the following disclaimer in the documentation and/or other materials
+//  provided with the distribution.
+//  
+//  THIS SOFTWARE IS PROVIDED BY KEARWOOD GILBERT ''AS IS'' AND ANY EXPRESS OR IMPLIED
+//  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+//  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KEARWOOD GILBERT OR
+//  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+//  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+//  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+//  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+//  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+//  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//  
+//  The views and conclusions contained in the software and documentation are those of the
+//  authors and should not be interpreted as representing official policies, either expressed
+//  or implied, of Kearwood Gilbert.
+//
+
+out vec4 colorOut;
+
+uniform sampler2D gbuffer_frame;
+uniform sampler2D gbuffer_depth;
+
+uniform mediump vec3 light_direction_view_space; // Must be normalized and converted to view space before entering shader
+uniform lowp vec3 light_color;
+uniform highp float light_intensity;
+uniform mediump vec4 viewport;
+
+void main()
+{
+    lowp vec2 gbuffer_uv = vec2(gl_FragCoord.xy / viewport.zw);  // FINDME, TODO - Dependent Texture Read adding latency, due to calculation of texture UV within fragment -- move to vertex shader?
+    lowp vec4 gbuffer_sample = texture(gbuffer_frame, gbuffer_uv);
+    
+    mediump vec3 gbuffer_normal = normalize(2.0 * gbuffer_sample.rgb - 1.0);
+    mediump float gbuffer_specular_exponent = gbuffer_sample.a * 100.0;
+    
+    mediump vec3 view_space_vertex_position = vec3(
+        ((2.0 * gl_FragCoord.xy) - (2.0 * viewport.xy)) / (viewport.zw) - 1.0,
+        (2.0 * -texture(gbuffer_depth, gbuffer_uv).r - gl_DepthRange.near - gl_DepthRange.far) / (gl_DepthRange.far - gl_DepthRange.near)
+    );
+    
+    //mediump float lamberFactor = max(0.0,dot(light_direction_view_space, gbuffer_normal)) * 0.2;
+    mediump float lamberFactor = dot(light_direction_view_space, gbuffer_normal) * 0.2;
+
+    mediump float specularFactor = 0.0;
+
+    mediump vec3 halfVec = normalize((normalize(- view_space_vertex_position) + light_direction_view_space)); // Normalizing anyways, no need to divide by 2
+    specularFactor = pow(dot(halfVec,gbuffer_normal), gbuffer_specular_exponent);
+
+    
+    colorOut = vec4(light_color * lamberFactor, specularFactor) * light_intensity;
+}