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JUCE/modules/juce_opengl/opengl/juce_OpenGLFrameBuffer.cpp

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/*
==============================================================================
This file is part of the JUCE library - "Jules' Utility Class Extensions"
Copyright 2004-11 by Raw Material Software Ltd.
------------------------------------------------------------------------------
JUCE can be redistributed and/or modified under the terms of the GNU General
Public License (Version 2), as published by the Free Software Foundation.
A copy of the license is included in the JUCE distribution, or can be found
online at www.gnu.org/licenses.
JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
------------------------------------------------------------------------------
To release a closed-source product which uses JUCE, commercial licenses are
available: visit www.rawmaterialsoftware.com/juce for more information.
==============================================================================
*/
BEGIN_JUCE_NAMESPACE
#if JUCE_WINDOWS
enum
{
GL_FRAMEBUFFER_EXT = 0x8D40,
GL_RENDERBUFFER_EXT = 0x8D41,
GL_COLOR_ATTACHMENT0_EXT = 0x8CE0,
GL_DEPTH_ATTACHMENT_EXT = 0x8D00,
GL_STENCIL_ATTACHMENT_EXT = 0x8D20,
GL_FRAMEBUFFER_COMPLETE_EXT = 0x8CD5,
GL_DEPTH24_STENCIL8_EXT = 0x88F0,
GL_RENDERBUFFER_DEPTH_SIZE_EXT = 0x8D54
};
#endif
#if JUCE_WINDOWS || JUCE_LINUX
#define FRAMEBUFFER_FUNCTION_LIST(USE_FUNCTION) \
USE_FUNCTION (glIsRenderbufferEXT, GLboolean, (GLuint renderbuffer))\
USE_FUNCTION (glBindRenderbufferEXT, void, (GLenum target, GLuint renderbuffer))\
USE_FUNCTION (glDeleteRenderbuffersEXT, void, (GLsizei n, const GLuint *renderbuffers))\
USE_FUNCTION (glGenRenderbuffersEXT, void, (GLsizei n, GLuint *renderbuffers))\
USE_FUNCTION (glRenderbufferStorageEXT, void, (GLenum target, GLenum internalformat, GLsizei width, GLsizei height))\
USE_FUNCTION (glGetRenderbufferParameterivEXT, void, (GLenum target, GLenum pname, GLint* params))\
USE_FUNCTION (glIsFramebufferEXT, GLboolean, (GLuint framebuffer))\
USE_FUNCTION (glBindFramebufferEXT, void, (GLenum target, GLuint framebuffer))\
USE_FUNCTION (glDeleteFramebuffersEXT, void, (GLsizei n, const GLuint *framebuffers))\
USE_FUNCTION (glGenFramebuffersEXT, void, (GLsizei n, GLuint *framebuffers))\
USE_FUNCTION (glCheckFramebufferStatusEXT, GLenum, (GLenum target))\
USE_FUNCTION (glFramebufferTexture1DEXT, void, (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level))\
USE_FUNCTION (glFramebufferTexture2DEXT, void, (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level))\
USE_FUNCTION (glFramebufferTexture3DEXT, void, (GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level, GLint zoffset))\
USE_FUNCTION (glFramebufferRenderbufferEXT, void, (GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer))\
USE_FUNCTION (glGetFramebufferAttachmentParameterivEXT, void, (GLenum target, GLenum attachment, GLenum pname, GLint *params))\
USE_FUNCTION (glGenerateMipmapEXT, void, (GLenum target))\
#if JUCE_WINDOWS
#define APICALLTYPE __stdcall
#else
#define APICALLTYPE
#endif
#define DECLARE_FUNCTION(name, returnType, params) \
typedef returnType (APICALLTYPE * type_ ## name) params; static type_ ## name name;
FRAMEBUFFER_FUNCTION_LIST (DECLARE_FUNCTION)
#undef DECLARE_FUNCTION
static bool framebufferFunctionsInitialised = false;
static void initialiseFrameBufferFunctions()
{
if (! framebufferFunctionsInitialised)
{
framebufferFunctionsInitialised = true;
#if JUCE_LINUX
#define lookUpFunction(name) glXGetProcAddress ((const GLubyte*) name)
#else
#define lookUpFunction(name) wglGetProcAddress (name)
#endif
#define FIND_FUNCTION(name, returnType, params) name = (type_ ## name) lookUpFunction (#name);
FRAMEBUFFER_FUNCTION_LIST (FIND_FUNCTION)
#undef FIND_FUNCTION
}
}
#undef FRAMEBUFFER_FUNCTION_LIST
//==============================================================================
#elif JUCE_OPENGL_ES
#define glIsRenderbufferEXT glIsRenderbufferOES
#define glBindRenderbufferEXT glBindRenderbufferOES
#define glDeleteRenderbuffersEXT glDeleteRenderbuffersOES
#define glGenRenderbuffersEXT glGenRenderbuffersOES
#define glRenderbufferStorageEXT glRenderbufferStorageOES
#define glGetRenderbufferParameterivEXT glGetRenderbufferParameterivOES
#define glIsFramebufferEXT glIsFramebufferOES
#define glBindFramebufferEXT glBindFramebufferOES
#define glDeleteFramebuffersEXT glDeleteFramebuffersOES
#define glGenFramebuffersEXT glGenFramebuffersOES
#define glCheckFramebufferStatusEXT glCheckFramebufferStatusOES
#define glFramebufferTexture1DEXT glFramebufferTexture1DOES
#define glFramebufferTexture2DEXT glFramebufferTexture2DOES
#define glFramebufferTexture3DEXT glFramebufferTexture3DOES
#define glFramebufferRenderbufferEXT glFramebufferRenderbufferOES
#define glGetFramebufferAttachmentParameterivEXT glGetFramebufferAttachmentParameterivOES
#define glGenerateMipmapEXT glGenerateMipmapOES
#define GL_FRAMEBUFFER_EXT GL_FRAMEBUFFER_OES
#define GL_RGBA8 GL_RGBA
#define GL_COLOR_ATTACHMENT0_EXT GL_COLOR_ATTACHMENT0_OES
#define GL_RENDERBUFFER_EXT GL_RENDERBUFFER_OES
#define GL_DEPTH24_STENCIL8_EXT GL_DEPTH24_STENCIL8_OES
#define GL_RENDERBUFFER_DEPTH_SIZE_EXT GL_RENDERBUFFER_DEPTH_SIZE_OES
#define GL_DEPTH_ATTACHMENT_EXT GL_DEPTH_ATTACHMENT_OES
#define GL_STENCIL_ATTACHMENT_EXT GL_STENCIL_ATTACHMENT_OES
#define GL_FRAMEBUFFER_COMPLETE_EXT GL_FRAMEBUFFER_COMPLETE_OES
#define GL_FRAMEBUFFER_UNSUPPORTED_EXT GL_FRAMEBUFFER_UNSUPPORTED_OES
#define GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_OES
#endif
//==============================================================================
class OpenGLFrameBuffer::Pimpl
{
public:
Pimpl (const int width_, const int height_,
const bool wantsDepthBuffer, const bool wantsStencilBuffer,
const GLenum textureType = GL_TEXTURE_2D)
: width (width_),
height (height_),
textureID (0),
frameBufferHandle (0),
depthOrStencilBuffer (0),
hasDepthBuffer (false),
hasStencilBuffer (false),
ok (false)
{
#if JUCE_WINDOWS || JUCE_LINUX
initialiseFrameBufferFunctions();
if (glGenFramebuffersEXT == nullptr)
return;
#endif
resetGLErrorState();
glGenFramebuffersEXT (1, &frameBufferHandle);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, frameBufferHandle);
glGenTextures (1, &textureID);
glBindTexture (textureType, textureID);
glTexImage2D (textureType, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glTexParameterf (textureType, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf (textureType, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameterf (textureType, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf (textureType, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glFramebufferTexture2DEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
textureType, textureID, 0);
if (wantsDepthBuffer || wantsStencilBuffer)
{
glGenRenderbuffersEXT (1, &depthOrStencilBuffer);
glBindRenderbufferEXT (GL_RENDERBUFFER_EXT, depthOrStencilBuffer);
jassert (glIsRenderbufferEXT (depthOrStencilBuffer));
if (wantsDepthBuffer && wantsStencilBuffer)
{
glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT, GL_DEPTH24_STENCIL8_EXT, width, height);
GLint params = 0;
glGetRenderbufferParameterivEXT (GL_RENDERBUFFER_EXT, GL_RENDERBUFFER_DEPTH_SIZE_EXT, &params);
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depthOrStencilBuffer);
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depthOrStencilBuffer);
hasDepthBuffer = true;
hasStencilBuffer = true;
}
else
{
#if JUCE_OPENGL_ES
glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT16, width, height);
#else
glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, width, height);
#endif
GLint params = 0;
glGetRenderbufferParameterivEXT (GL_RENDERBUFFER_EXT, GL_RENDERBUFFER_DEPTH_SIZE_EXT, &params);
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depthOrStencilBuffer);
hasDepthBuffer = true;
}
}
ok = checkStatus();
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0);
}
~Pimpl()
{
if (textureID != 0)
glDeleteTextures (1, &textureID);
if (depthOrStencilBuffer != 0)
glDeleteRenderbuffersEXT (1, &depthOrStencilBuffer);
if (frameBufferHandle != 0)
glDeleteFramebuffersEXT (1, &frameBufferHandle);
}
bool bind() { return bind (frameBufferHandle); }
bool unbind() { return bind (0); }
/*Image createImage()
{
Image im;
if (ok)
{
bind();
im = Image (Image::ARGB, width, height, true);
Image::BitmapData data (im, Image::BitmapData::writeOnly);
glReadPixels (0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data.data);
unbind();
}
return im;
}*/
const int width, height;
GLuint textureID, frameBufferHandle, depthOrStencilBuffer;
bool hasDepthBuffer, hasStencilBuffer, ok;
private:
bool bind (GLuint buffer)
{
if (ok)
{
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, buffer);
ok = checkStatus();
}
return ok;
}
static bool checkStatus() noexcept
{
const GLenum status = glCheckFramebufferStatusEXT (GL_FRAMEBUFFER_EXT);
return status == GL_NO_ERROR
|| status == GL_FRAMEBUFFER_COMPLETE_EXT;
}
static void resetGLErrorState()
{
while (glGetError() != GL_NO_ERROR) {}
}
JUCE_DECLARE_NON_COPYABLE (Pimpl);
};
//==============================================================================
OpenGLFrameBuffer::OpenGLFrameBuffer() {}
OpenGLFrameBuffer::~OpenGLFrameBuffer() {}
bool OpenGLFrameBuffer::initialise (int width, int height)
{
release();
pimpl = new Pimpl (width, height, true, false);
if (! pimpl->ok)
pimpl = nullptr;
return pimpl != nullptr;
}
void OpenGLFrameBuffer::release()
{
pimpl = nullptr;
}
int OpenGLFrameBuffer::getWidth() const noexcept { return pimpl != nullptr ? pimpl->width : 0; }
int OpenGLFrameBuffer::getHeight() const noexcept { return pimpl != nullptr ? pimpl->height : 0; }
GLuint OpenGLFrameBuffer::getTextureID() const noexcept { return pimpl != nullptr ? pimpl->textureID : 0; }
void OpenGLFrameBuffer::makeCurrentTarget()
{
if (pimpl != nullptr)
pimpl->bind();
}
void OpenGLFrameBuffer::releaseCurrentTarget()
{
if (pimpl != nullptr)
pimpl->unbind();
}
END_JUCE_NAMESPACE
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