Developer Documentation
PostProcessorGrayPlugin.cc
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49 
50 #include <ACG/GL/acg_glew.hh>
51 
52 #include "PostProcessorGrayPlugin.hh"
53 
54 #include <ACG/GL/ScreenQuad.hh>
55 
57 
58 PostProcessorGrayscalePlugin::PostProcessorGrayscalePlugin() :
59 shader_(0)
60 {
61 }
62 
63 PostProcessorGrayscalePlugin::~PostProcessorGrayscalePlugin()
64 {
65  delete shader_;
66 }
67 
68 
69 QString PostProcessorGrayscalePlugin::postProcessorName() {
70  return QString("Grayscale");
71 }
72 
73 QString PostProcessorGrayscalePlugin::checkOpenGL() {
74  if (!ACG::openGLVersion(3, 0))
75  return QString("Insufficient OpenGL Version! OpenGL 3.0 or higher required");
76 
77  return QString("");
78 }
79 
80 
81 void PostProcessorGrayscalePlugin::postProcess(ACG::GLState* _glstate, const std::vector<const PostProcessorInput*>& _input, const PostProcessorOutput& _output) {
82 
83  // ======================================================================================================
84  // Load shader if needed
85  // ======================================================================================================
86  if (!shader_)
87  shader_ = GLSL::loadProgram("Grayscale/screenquad.glsl", "Grayscale/gray.glsl");
88 
89  // ======================================================================================================
90  // Bind input texture
91  // ======================================================================================================
92 
93 // glEnable(GL_TEXTURE_2D);
94  _input[0]->bindColorTex(0);
95 
96  // ======================================================================================================
97  // Bind output FBO
98  // ======================================================================================================
99 
100  _output.bind();
101 
102  // ======================================================================================================
103  // Setup shader
104  // ======================================================================================================
105 
106  shader_->use();
107  shader_->setUniform("textureSampler", 0);
108 
109  ACG::Vec2f texcoordOffset(1.0f / float(_input[0]->width), 1.0f / float(_input[0]->height));
110  shader_->setUniform("texcoordOffset", texcoordOffset);
111 
112  // ======================================================================================================
113  // Execute
114  // ======================================================================================================
115 
117 
118 
119  shader_->disable();
120 }
121 
122 
123 #if QT_VERSION < 0x050000
124  Q_EXPORT_PLUGIN2( postprocessorgrayscaleplugin , PostProcessorGrayscalePlugin );
125 #endif
126 
static void draw(GLSL::Program *_prog=0)
Draw the screen quad.
Definition: ScreenQuad.cc:147
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:1082
void use()
Enables the program object for using.
Definition: GLSLShader.cc:351
bool openGLVersion(const int _major, const int _minor)
Definition: gl.cc:95
void setUniform(const char *_name, GLint _value)
Set int uniform to specified value.
Definition: GLSLShader.cc:391
void disable()
Resets to standard rendering pipeline.
Definition: GLSLShader.cc:361