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magnum/src/Magnum/Shaders/MeshVisualizer.vert

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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.
Happy new year too.
12 years ago
Copyright © 2010, 2011, 2012, 2013, 2014
Vladimír Vondruš <mosra@centrum.cz>
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
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 attribute
#define out varying
#endif
#ifdef EXPLICIT_UNIFORM_LOCATION
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 = 0) uniform mat4 transformationProjectionMatrix;
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 highp mat4 transformationProjectionMatrix;
#endif
#ifdef EXPLICIT_ATTRIB_LOCATION
Shaders: fix MeshVisualizer on ES3. I wonder why this issue didn't appear before.
12 years ago
layout(location = POSITION_ATTRIBUTE_LOCATION) in highp vec4 position;
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
in highp vec4 position;
#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: 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
#if defined(WIREFRAME_RENDERING) && defined(NO_GEOMETRY_SHADER)
#if (!defined(GL_ES) && __VERSION__ < 140) || (defined(GL_ES) && __VERSION__ < 300)
#ifdef EXPLICIT_ATTRIB_LOCATION
Shaders: set MeshVisualizer::VertexIndex attribute location to 3. Locations 0, 1 and 2 will be reserved for positions, texture coordinates and normals.
13 years ago
layout(location = 3) in lowp float vertexIndex;
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
in lowp float vertexIndex;
#endif
#define gl_VertexID int(vertexIndex)
#endif
out vec3 barycentric;
#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() {
gl_Position = transformationProjectionMatrix*position;
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
#if defined(WIREFRAME_RENDERING) && defined(NO_GEOMETRY_SHADER)
barycentric = vec3(0.0);
Shaders: fix compilation of MeshVisualizer on WebGL and ANGLE. WebGL mandates that array subscription is done with constant expression, ANGLE too (but I think that has also something to do with D3D9 limitations). This is however allowed by OpenGL ES 2.0 specification, so enabling the workaround only for WebGL and ANGLE (i.e., this won't apply to Native Client using native GL drivers).
12 years ago
#ifdef SUBSCRIPTING_WORKAROUND
int i = int(mod(vertexIndex, 3.0));
if(i == 0) barycentric.x = 1.0;
else if(i == 1) barycentric.y = 1.0;
else barycentric.z = 1.0;
#elif !defined(NEW_GLSL)
Shaders: really ported MeshVisualizer to ES.
13 years ago
barycentric[int(mod(vertexIndex, 3.0))] = 1.0;
#else
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
barycentric[gl_VertexID % 3] = 1.0;
#endif
Shaders: fix compilation of MeshVisualizer on WebGL and ANGLE. WebGL mandates that array subscription is done with constant expression, ANGLE too (but I think that has also something to do with D3D9 limitations). This is however allowed by OpenGL ES 2.0 specification, so enabling the workaround only for WebGL and ANGLE (i.e., this won't apply to Native Client using native GL drivers).
12 years ago
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
}