Developer Documentation
PostProcessorGrayPlugin.cc
1 /*===========================================================================*\
2 * *
3 * OpenFlipper *
4  * Copyright (c) 2001-2015, RWTH-Aachen University *
5  * Department of Computer Graphics and Multimedia *
6  * All rights reserved. *
7  * www.openflipper.org *
8  * *
9  *---------------------------------------------------------------------------*
10  * This file is part of OpenFlipper. *
11  *---------------------------------------------------------------------------*
12  * *
13  * Redistribution and use in source and binary forms, with or without *
14  * modification, are permitted provided that the following conditions *
15  * are met: *
16  * *
17  * 1. Redistributions of source code must retain the above copyright notice, *
18  * this list of conditions and the following disclaimer. *
19  * *
20  * 2. Redistributions in binary form must reproduce the above copyright *
21  * notice, this list of conditions and the following disclaimer in the *
22  * documentation and/or other materials provided with the distribution. *
23  * *
24  * 3. Neither the name of the copyright holder nor the names of its *
25  * contributors may be used to endorse or promote products derived from *
26  * this software without specific prior written permission. *
27  * *
28  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
29  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
30  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
31  * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
32  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
33  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
34  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
35  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
36  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *
37  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *
38  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
39 * *
40 \*===========================================================================*/
41 
42 
43 
44 #include <ACG/GL/acg_glew.hh>
45 
46 #include "PostProcessorGrayPlugin.hh"
47 
48 #include <ACG/GL/ScreenQuad.hh>
49 
51 
52 PostProcessorGrayscalePlugin::PostProcessorGrayscalePlugin() :
53 shader_(0)
54 {
55 }
56 
57 PostProcessorGrayscalePlugin::~PostProcessorGrayscalePlugin()
58 {
59  delete shader_;
60 }
61 
62 
63 QString PostProcessorGrayscalePlugin::postProcessorName() {
64  return QString("Grayscale");
65 }
66 
67 QString PostProcessorGrayscalePlugin::checkOpenGL() {
68  if (!ACG::openGLVersion(3, 0))
69  return QString("Insufficient OpenGL Version! OpenGL 3.0 or higher required");
70 
71  return QString("");
72 }
73 
74 
75 void PostProcessorGrayscalePlugin::postProcess(ACG::GLState* _glstate, const std::vector<const PostProcessorInput*>& _input, const PostProcessorOutput& _output) {
76 
77  // ======================================================================================================
78  // Load shader if needed
79  // ======================================================================================================
80  if (!shader_)
81  shader_ = GLSL::loadProgram("Grayscale/screenquad.glsl", "Grayscale/gray.glsl");
82 
83  // ======================================================================================================
84  // Bind input texture
85  // ======================================================================================================
86 
87 // glEnable(GL_TEXTURE_2D);
88  _input[0]->bindColorTex(0);
89 
90  // ======================================================================================================
91  // Bind output FBO
92  // ======================================================================================================
93 
94  _output.bind();
95 
96  // ======================================================================================================
97  // Setup shader
98  // ======================================================================================================
99 
100  shader_->use();
101  shader_->setUniform("textureSampler", 0);
102 
103  ACG::Vec2f texcoordOffset(1.0f / float(_input[0]->width), 1.0f / float(_input[0]->height));
104  shader_->setUniform("texcoordOffset", texcoordOffset);
105 
106  // ======================================================================================================
107  // Execute
108  // ======================================================================================================
109 
111 
112 
113  shader_->disable();
114 }
115 
116 
117 
static void draw(GLSL::Program *_prog=0)
Draw the screen quad.
Definition: ScreenQuad.cc:138
void use()
Enables the program object for using.
Definition: GLSLShader.cc:345
GLSL::PtrProgram loadProgram(const char *vertexShaderFile, const char *tessControlShaderFile, const char *tessEvaluationShaderFile, const char *geometryShaderFile, const char *fragmentShaderFile, const GLSL::StringList *macros, bool verbose)
Definition: GLSLShader.cc:1076
void setUniform(const char *_name, GLint _value)
Set int uniform to specified value.
Definition: GLSLShader.cc:385
bool openGLVersion(const int _major, const int _minor, bool _verbose)
Definition: gl.cc:129
void disable()
Resets to standard rendering pipeline.
Definition: GLSLShader.cc:355