47 m_initialized( false ),
51 m_curFbo( DIRECT_RENDERING ),
66 catch(
const std::runtime_error& exc )
68 wxLogError( wxT(
"Run time exception `%s` occurred in OPENGL_COMPOSITOR destructor." ),
101 m_antialiasing = std::make_unique<ANTIALIASING_SUPERSAMPLING>(
this );
109 assert( dims.
x != 0 && dims.
y != 0 );
112 glGetIntegerv( GL_MAX_RENDERBUFFER_SIZE_EXT, &maxBufSize );
115 if( dims.
x > (
unsigned) maxBufSize || dims.
y >= (
unsigned) maxBufSize )
116 throw std::runtime_error(
"Requested render buffer size is not supported" );
121 checkGlError(
"generating framebuffer", __FILE__, __LINE__ );
127 checkGlError(
"generating renderbuffer", __FILE__, __LINE__ );
129 checkGlError(
"binding renderbuffer", __FILE__, __LINE__ );
131 glRenderbufferStorageEXT( GL_RENDERBUFFER_EXT, GL_DEPTH24_STENCIL8, dims.
x, dims.
y );
132 checkGlError(
"creating renderbuffer storage", __FILE__, __LINE__ );
133 glFramebufferRenderbufferEXT( GL_FRAMEBUFFER_EXT, GL_DEPTH_STENCIL_ATTACHMENT,
135 checkGlError(
"attaching renderbuffer", __FILE__, __LINE__ );
168 int maxBuffers, maxTextureSize;
171 glGetIntegerv( GL_MAX_COLOR_ATTACHMENTS, (GLint*) &maxBuffers );
175 throw std::runtime_error(
"Cannot create more framebuffers. OpenGL rendering backend "
176 "requires at least 3 framebuffers. You may try to update/change "
177 "your graphic drivers." );
180 glGetIntegerv( GL_MAX_TEXTURE_SIZE, (GLint*) &maxTextureSize );
182 if( maxTextureSize < (
int) aDimensions.
x || maxTextureSize < (
int) aDimensions.
y )
184 throw std::runtime_error(
"Requested texture size is not supported. "
185 "Could not create a buffer." );
189 GLuint attachmentPoint = GL_COLOR_ATTACHMENT0 +
usedBuffers();
190 GLuint textureTarget;
193 glActiveTexture( GL_TEXTURE0 );
194 glGenTextures( 1, &textureTarget );
195 checkGlError(
"generating framebuffer texture target", __FILE__, __LINE__ );
196 glBindTexture( GL_TEXTURE_2D, textureTarget );
197 checkGlError(
"binding framebuffer texture target", __FILE__, __LINE__ );
200 glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
201 glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA8, aDimensions.
x, aDimensions.
y, 0, GL_RGBA,
202 GL_UNSIGNED_BYTE,
nullptr );
203 checkGlError(
"creating framebuffer texture", __FILE__, __LINE__ );
204 glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
205 glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
209 glFramebufferTexture2DEXT( GL_FRAMEBUFFER_EXT, attachmentPoint, GL_TEXTURE_2D, textureTarget,
213 GLenum status = glCheckFramebufferStatusEXT( GL_FRAMEBUFFER_EXT );
215 if( status != GL_FRAMEBUFFER_COMPLETE_EXT )
219 case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT:
220 throw std::runtime_error(
"The framebuffer attachment points are incomplete." );
222 case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
223 throw std::runtime_error(
"No images attached to the framebuffer." );
225 case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
226 throw std::runtime_error(
"The framebuffer does not have at least one "
227 "image attached to it." );
229 case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
230 throw std::runtime_error(
"The framebuffer read buffer is incomplete." );
232 case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
233 throw std::runtime_error(
"The combination of internal formats of the attached "
234 "images violates an implementation-dependent set of "
237 case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE_EXT:
238 throw std::runtime_error(
"GL_RENDERBUFFER_SAMPLES is not the same for "
239 "all attached renderbuffers" );
241 case GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS_EXT:
242 throw std::runtime_error(
"Framebuffer incomplete layer targets errors." );
244 case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
245 throw std::runtime_error(
"Framebuffer attachments have different dimensions" );
248 throw std::runtime_error(
"Unknown error occurred when creating the framebuffer." );
258 OPENGL_BUFFER buffer = { aDimensions, textureTarget, attachmentPoint };
267 wxASSERT( aBufferHandle > 0 && aBufferHandle <=
usedBuffers() );
268 return m_buffers[aBufferHandle - 1].textureTarget;
285 checkGlError(
"setting draw buffer", __FILE__, __LINE__ );
301 glClearColor( aColor.
r, aColor.
g, aColor.
b, 0.0f );
302 glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT );
327 wxASSERT( aSourceHandle != 0 && aSourceHandle <=
usedBuffers() );
334 glDisable( GL_DEPTH_TEST );
335 glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA );
338 glEnable( GL_TEXTURE_2D );
339 glBindTexture( GL_TEXTURE_2D,
m_buffers[aSourceHandle - 1].textureTarget );
342 glMatrixMode( GL_MODELVIEW );
345 glMatrixMode( GL_PROJECTION );
349 glBegin( GL_TRIANGLES );
350 glTexCoord2f( 0.0f, 1.0f );
351 glVertex2f( -1.0f, 1.0f );
352 glTexCoord2f( 0.0f, 0.0f );
353 glVertex2f( -1.0f, -1.0f );
354 glTexCoord2f( 1.0f, 1.0f );
355 glVertex2f( 1.0f, 1.0f );
357 glTexCoord2f( 1.0f, 1.0f );
358 glVertex2f( 1.0f, 1.0f );
359 glTexCoord2f( 0.0f, 0.0f );
360 glVertex2f( -1.0f, -1.0f );
361 glTexCoord2f( 1.0f, 0.0f );
362 glVertex2f( 1.0f, -1.0f );
366 glMatrixMode( GL_MODELVIEW );
384 glBindFramebufferEXT( GL_FRAMEBUFFER, aFb );
385 checkGlError(
"switching framebuffer", __FILE__, __LINE__ );
398 glDeleteTextures( 1, &buffer.textureTarget );
402 if( glDeleteFramebuffersEXT )
403 glDeleteFramebuffersEXT( 1, &
m_mainFbo );
405 if( glDeleteRenderbuffersEXT )
A color representation with 4 components: red, green, blue, alpha.
static const COLOR4D BLACK
unsigned int m_height
Height of the buffer (in pixels)
unsigned int m_width
Width of the buffer (in pixels)
virtual ~OPENGL_COMPOSITOR()
VECTOR2D GetAntialiasRenderingOffset() const
OPENGL_ANTIALIASING_MODE m_currentAntialiasingMode
virtual void Begin() override
Call this at the beginning of each frame.
unsigned int usedBuffers()
Returns number of used buffers.
static const unsigned int DIRECT_RENDERING
OPENGL_ANTIALIASING_MODE GetAntialiasingMode() const
void SetAntialiasingMode(OPENGL_ANTIALIASING_MODE aMode)
VECTOR2U GetScreenSize() const
void clean()
Perform freeing of resources.
virtual void Present() override
Call this to present the output buffer to the screen.
bool m_initialized
Initialization status flag.
void bindFb(unsigned int aFb)
Binds a specific Framebuffer Object.
GLuint m_curFbo
Store the used FBO name in case there was more than one compositor used.
virtual void Initialize() override
Perform primary initialization, necessary to use the object.
GLuint m_depthBuffer
Depth buffer handle.
virtual void ClearBuffer(const COLOR4D &aColor) override
Clear the selected buffer (set by the SetBuffer() function).
std::unique_ptr< OPENGL_PRESENTOR > m_antialiasing
virtual void Resize(unsigned int aWidth, unsigned int aHeight) override
Clear the state of COMPOSITOR, so it has to be reinitialized again with the new dimensions.
OPENGL_BUFFERS m_buffers
Stores information about initialized buffers.
virtual void DrawBuffer(unsigned int aBufferHandle) override
Draw the selected buffer to the output buffer.
GLuint m_mainFbo
Main FBO handle (storing all target textures)
int GetAntialiasSupersamplingFactor() const
unsigned int m_curBuffer
Currently used buffer handle.
GLenum GetBufferTexture(unsigned int aBufferHandle)
virtual void SetBuffer(unsigned int aBufferHandle) override
Set the selected buffer as the rendering target.
virtual unsigned int CreateBuffer() override
Prepare a new buffer that may be used as a rendering target.
The Cairo implementation of the graphics abstraction layer.
Handle multitarget rendering (ie.
int checkGlError(const std::string &aInfo, const char *aFile, int aLine, bool aThrow)
Check if a recent OpenGL operation has failed.
VECTOR2< double > VECTOR2D