1efbb63ecf
Created structures for alpha transparency and occlusion culling Fixed memory allocation issue in KREngine.mm (pointer to NSDictionary allocated on stack retained and later dereferenced when popped) --HG-- extra : convert_revision : svn%3A7752d6cf-9f14-4ad2-affc-04f1e67b81a5/trunk%4074
74 lines
3.3 KiB
GLSL
74 lines
3.3 KiB
GLSL
// 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.
|
|
//
|
|
|
|
|
|
uniform sampler2D gbuffer_frame;
|
|
uniform sampler2D gbuffer_depth;
|
|
|
|
uniform lowp vec3 light_color;
|
|
uniform highp float light_intensity;
|
|
uniform highp float light_decay_start;
|
|
uniform highp float light_cutoff;
|
|
uniform mediump vec4 viewport;
|
|
|
|
uniform highp mat4 inv_projection_matrix;
|
|
|
|
uniform highp vec3 view_space_light_position;
|
|
|
|
void main()
|
|
{
|
|
|
|
lowp vec2 gbuffer_uv = vec2(gl_FragCoord.xy / viewport.zw);
|
|
lowp vec4 gbuffer_sample = texture2D(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 vec4 clip_space_vertex_position = vec4(
|
|
gl_FragCoord.xy / viewport.zw * 2.0 - 1.0,
|
|
texture2D(gbuffer_depth, gbuffer_uv).r * 2.0 - 1.0,
|
|
1.0
|
|
);
|
|
|
|
|
|
mediump vec4 view_space_vertex_position = inv_projection_matrix * clip_space_vertex_position;
|
|
view_space_vertex_position.xyz /= view_space_vertex_position.w;
|
|
|
|
mediump float light_distance = max(0.0, distance(view_space_light_position.xyz, view_space_vertex_position.xyz) - light_decay_start);
|
|
mediump float light_attenuation = (light_intensity / ((light_distance + 1.0) * (light_distance + 1.0)) - light_cutoff) / (1.0 - light_cutoff);
|
|
mediump vec3 light_vec = normalize(view_space_light_position.xyz - view_space_vertex_position.xyz);
|
|
mediump float lamberFactor = dot(light_vec, gbuffer_normal) * 0.2;
|
|
|
|
mediump float specularFactor = 0.0;
|
|
//if(gbuffer_specular_exponent > 0.0) {
|
|
mediump vec3 halfVec = normalize((normalize(- view_space_vertex_position.xyz) + light_vec));
|
|
specularFactor = pow(dot(halfVec,gbuffer_normal), gbuffer_specular_exponent);
|
|
//}
|
|
|
|
gl_FragColor = vec4(light_color * lamberFactor, specularFactor) * light_attenuation;
|
|
}
|