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magnum/src/Shaders/MeshVisualizer.frag

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Shaders: added first version of MeshVisualizer shader. Rudely written to work only with fairly recent extensions and nothing less than GLSL 3.30. It requires geometry shaders for wireframe rendering, without it it behaves the same as Shaders::Flat.
13 years ago
/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz>
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
#ifndef NEW_GLSL
#define in varying
#define fragmentColor gl_FragColor
Shaders: `const` for readonly variables is since GLSL 4.20.
13 years ago
#endif
#ifndef RUNTIME_CONST
Shaders: really ported MeshVisualizer to ES.
13 years ago
#define const
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
#endif
#ifndef EXPLICIT_UNIFORM_LOCATION
#define layout(arg)
#endif
#ifndef GL_ES
Shaders: added first version of MeshVisualizer shader. Rudely written to work only with fairly recent extensions and nothing less than GLSL 3.30. It requires geometry shaders for wireframe rendering, without it it behaves the same as Shaders::Flat.
13 years ago
layout(location = 2) uniform vec4 color = vec4(1.0, 1.0, 1.0, 1.0);
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
#else
uniform lowp vec4 color;
#endif
Shaders: added first version of MeshVisualizer shader. Rudely written to work only with fairly recent extensions and nothing less than GLSL 3.30. It requires geometry shaders for wireframe rendering, without it it behaves the same as Shaders::Flat.
13 years ago
#ifdef WIREFRAME_RENDERING
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
#ifndef GL_ES
Shaders: added first version of MeshVisualizer shader. Rudely written to work only with fairly recent extensions and nothing less than GLSL 3.30. It requires geometry shaders for wireframe rendering, without it it behaves the same as Shaders::Flat.
13 years ago
layout(location = 3) uniform vec4 wireframeColor = vec4(0.0, 0.0, 0.0, 1.0);
layout(location = 4) uniform float wireframeWidth = 1.0;
layout(location = 5) uniform float smoothness = 2.0;
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
#else
uniform lowp vec4 wireframeColor;
uniform lowp float wireframeWidth;
uniform lowp float smoothness;
#endif
#ifndef NO_GEOMETRY_SHADER
Shaders: really ported MeshVisualizer to ES.
13 years ago
noperspective in lowp vec3 dist;
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
#else
Shaders: really ported MeshVisualizer to ES.
13 years ago
in lowp vec3 barycentric;
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
#endif
Shaders: added first version of MeshVisualizer shader. Rudely written to work only with fairly recent extensions and nothing less than GLSL 3.30. It requires geometry shaders for wireframe rendering, without it it behaves the same as Shaders::Flat.
13 years ago
#endif
Shaders: really ported MeshVisualizer to ES.
13 years ago
#ifdef NEW_GLSL
Shaders: added first version of MeshVisualizer shader. Rudely written to work only with fairly recent extensions and nothing less than GLSL 3.30. It requires geometry shaders for wireframe rendering, without it it behaves the same as Shaders::Flat.
13 years ago
out vec4 fragmentColor;
Shaders: really ported MeshVisualizer to ES.
13 years ago
#endif
Shaders: added first version of MeshVisualizer shader. Rudely written to work only with fairly recent extensions and nothing less than GLSL 3.30. It requires geometry shaders for wireframe rendering, without it it behaves the same as Shaders::Flat.
13 years ago
Shaders: really ported MeshVisualizer to ES.
13 years ago
#if defined(WIREFRAME_RENDERING) && defined(GL_ES) && __VERSION__ < 300
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
#extension GL_OES_standard_derivatives : enable
#endif
Shaders: added first version of MeshVisualizer shader. Rudely written to work only with fairly recent extensions and nothing less than GLSL 3.30. It requires geometry shaders for wireframe rendering, without it it behaves the same as Shaders::Flat.
13 years ago
void main() {
#ifdef WIREFRAME_RENDERING
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
#ifndef NO_GEOMETRY_SHADER
Shaders: added first version of MeshVisualizer shader. Rudely written to work only with fairly recent extensions and nothing less than GLSL 3.30. It requires geometry shaders for wireframe rendering, without it it behaves the same as Shaders::Flat.
13 years ago
/* Distance to nearest side */
const float nearest = min(min(dist.x, dist.y), dist.z);
/* Smooth step between face color and wireframe color based on distance */
fragmentColor = mix(wireframeColor, color, smoothstep(wireframeWidth-smoothness, wireframeWidth+smoothness, nearest));
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
#else
Shaders: really ported MeshVisualizer to ES.
13 years ago
const lowp vec3 d = fwidth(barycentric);
const lowp vec3 factor = smoothstep(vec3(0.0), d*1.5, barycentric);
const lowp float nearest = min(min(factor.x, factor.y), factor.z);
Shaders: ported MeshVisualizer to not require geometry shader. Wireframe width and smoothness isn't ported yet, because I don't fully understand the behavior of standard derivatives in fragment shader.
13 years ago
fragmentColor = mix(wireframeColor, color, nearest);
#endif
Shaders: added first version of MeshVisualizer shader. Rudely written to work only with fairly recent extensions and nothing less than GLSL 3.30. It requires geometry shaders for wireframe rendering, without it it behaves the same as Shaders::Flat.
13 years ago
#else
fragmentColor = color;
#endif
}