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JUCE/modules/juce_opengl/opengl/juce_OpenGLFrameBuffer.cpp
jules 0e478bf131 More OpenGL work.
2011-10-20 22:26:55 +01:00

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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))\
FRAMEBUFFER_FUNCTION_LIST (JUCE_DECLARE_GL_EXTENSION_FUNCTION)
static bool framebufferFunctionsInitialised = false;
static void initialiseFrameBufferFunctions()
{
if (! framebufferFunctionsInitialised)
{
framebufferFunctionsInitialised = true;
#define FIND_FUNCTION(name, returnType, params) name = (type_ ## name) OpenGLHelpers::getExtensionFunction (#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)
: width (width_),
height (height_),
textureID (0),
frameBufferHandle (0),
depthOrStencilBuffer (0),
hasDepthBuffer (false),
hasStencilBuffer (false),
ok (false)
{
// Framebuffer objects can only be created when the current thread has an active OpenGL
// context. You'll need to make an OpenGLComponent active before calling this.
jassert (OpenGLHelpers::isContextActive());
#if JUCE_WINDOWS || JUCE_LINUX
initialiseFrameBufferFunctions();
if (glGenFramebuffersEXT == nullptr)
return;
#endif
OpenGLHelpers::resetErrorState();
glGenFramebuffersEXT (1, &frameBufferHandle);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, frameBufferHandle);
glGenTextures (1, &textureID);
glBindTexture (GL_TEXTURE_2D, textureID);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA8, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
glFramebufferTexture2DEXT (GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, textureID, 0);
if (wantsDepthBuffer || wantsStencilBuffer)
{
glGenRenderbuffersEXT (1, &depthOrStencilBuffer);
glBindRenderbufferEXT (GL_RENDERBUFFER_EXT, depthOrStencilBuffer);
jassert (glIsRenderbufferEXT (depthOrStencilBuffer));
glRenderbufferStorageEXT (GL_RENDERBUFFER_EXT,
(wantsDepthBuffer && wantsStencilBuffer) ? GL_DEPTH24_STENCIL8_EXT
#if JUCE_OPENGL_ES
: GL_DEPTH_COMPONENT16,
#else
: GL_DEPTH_COMPONENT,
#endif
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);
if (wantsStencilBuffer)
glFramebufferRenderbufferEXT (GL_FRAMEBUFFER_EXT, GL_STENCIL_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, depthOrStencilBuffer);
hasDepthBuffer = wantsDepthBuffer;
hasStencilBuffer = wantsStencilBuffer;
}
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); }
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;
}
JUCE_DECLARE_NON_COPYABLE (Pimpl);
};
//==============================================================================
class OpenGLFrameBuffer::SavedState
{
public:
SavedState (OpenGLFrameBuffer& buffer, const int w, const int h)
: width (w), height (h),
data (w * h)
{
buffer.readPixels (data, Rectangle<int> (w, h));
}
bool restore (OpenGLFrameBuffer& buffer)
{
if (buffer.initialise (width, height))
{
buffer.writePixels (data, Rectangle<int> (width, height));
return true;
}
return false;
}
private:
const int width, height;
HeapBlock <PixelARGB> data;
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SavedState);
};
//==============================================================================
OpenGLFrameBuffer::OpenGLFrameBuffer() {}
OpenGLFrameBuffer::~OpenGLFrameBuffer() {}
bool OpenGLFrameBuffer::initialise (int width, int height)
{
pimpl = nullptr;
pimpl = new Pimpl (width, height, false, false);
if (! pimpl->ok)
pimpl = nullptr;
return pimpl != nullptr;
}
bool OpenGLFrameBuffer::initialise (const Image& image)
{
if (! image.isARGB())
return initialise (image.convertedToFormat (Image::ARGB));
Image::BitmapData bitmap (image, Image::BitmapData::readOnly);
return initialise (bitmap.width, bitmap.height)
&& writePixels ((const PixelARGB*) bitmap.data, image.getBounds());
}
bool OpenGLFrameBuffer::initialise (const OpenGLFrameBuffer& other)
{
const Pimpl* const p = other.pimpl;
if (p == nullptr)
{
pimpl = nullptr;
return true;
}
if (initialise (p->width, p->height))
{
pimpl->bind();
OpenGLHelpers::prepareFor2D (p->width, p->height);
glDisable (GL_BLEND);
glColor4f (1.0f, 1.0f, 1.0f, 1.0f);
other.drawAt (0, 0);
pimpl->unbind();
}
return false;
}
void OpenGLFrameBuffer::release()
{
pimpl = nullptr;
savedState = nullptr;
}
void OpenGLFrameBuffer::saveAndRelease()
{
if (pimpl != nullptr)
{
savedState = new SavedState (*this, pimpl->width, pimpl->height);
pimpl = nullptr;
}
}
bool OpenGLFrameBuffer::reloadSavedCopy()
{
if (savedState != nullptr)
{
ScopedPointer<SavedState> state (savedState);
if (state->restore (*this))
return true;
savedState = state;
}
return false;
}
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; }
bool OpenGLFrameBuffer::makeCurrentRenderingTarget()
{
// trying to use a framebuffer after saving it with saveAndRelease()! Be sure to call
// reloadSavedCopy() to put it back into GPU memory before using it..
jassert (savedState == nullptr);
return pimpl != nullptr && pimpl->bind();
}
void OpenGLFrameBuffer::setCurrentFrameBufferTarget (GLuint frameBufferID)
{
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, frameBufferID);
}
void OpenGLFrameBuffer::releaseAsRenderingTarget()
{
setCurrentFrameBufferTarget (0);
}
void OpenGLFrameBuffer::clear (const Colour& colour)
{
if (makeCurrentRenderingTarget())
{
OpenGLHelpers::clear (colour);
releaseAsRenderingTarget();
}
}
void OpenGLFrameBuffer::makeCurrentAndClear()
{
if (makeCurrentRenderingTarget())
{
glClearColor (0, 0, 0, 0);
glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
}
}
bool OpenGLFrameBuffer::readPixels (PixelARGB* target, const Rectangle<int>& area)
{
if (! makeCurrentRenderingTarget())
return false;
glPixelStorei (GL_PACK_ALIGNMENT, 4);
glReadPixels (area.getX(), area.getY(), area.getWidth(), area.getHeight(), GL_RGBA, GL_UNSIGNED_BYTE, target);
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0);
return true;
}
bool OpenGLFrameBuffer::writePixels (const PixelARGB* data, const Rectangle<int>& area)
{
if (! makeCurrentRenderingTarget())
return false;
const int invertedY = pimpl->height - area.getBottom();
OpenGLHelpers::prepareFor2D (pimpl->width, pimpl->height);
glDisable (GL_DEPTH_TEST);
glDisable (GL_BLEND);
glColor4f (1.0f, 1.0f, 1.0f, 1.0f);
#if JUCE_OPENGL_ES
{
// GLES has no glDrawPixels function, so we have to create a texture and draw it..
glEnable (GL_TEXTURE_2D);
OpenGLTexture temp;
temp.load (data, area.getWidth(), area.getHeight());
temp.bind();
const GLint cropRect[4] = { 0, 0, area.getWidth(), area.getHeight() };
glTexParameteriv (GL_TEXTURE_2D, GL_TEXTURE_CROP_RECT_OES, cropRect);
glDrawTexiOES (area.getX(), invertedY, 1, area.getWidth(), area.getHeight());
glBindTexture (GL_TEXTURE_2D, 0);
}
#else
glRasterPos2i (area.getX(), invertedY);
glBindTexture (GL_TEXTURE_2D, 0);
glPixelStorei (GL_UNPACK_ALIGNMENT, 4);
glDrawPixels (area.getWidth(), area.getHeight(), GL_BGRA_EXT, GL_UNSIGNED_BYTE, data);
#endif
glBindFramebufferEXT (GL_FRAMEBUFFER_EXT, 0);
return true;
}
void OpenGLFrameBuffer::draw2D (float x1, float y1,
float x2, float y2,
float x3, float y3,
float x4, float y4,
const Colour& colour) const
{
if (pimpl != nullptr)
{
glBindTexture (GL_TEXTURE_2D, pimpl->textureID);
OpenGLHelpers::drawQuad2D (x1, y1, x2, y2, x3, y3, x4, y4, colour);
glBindTexture (GL_TEXTURE_2D, 0);
}
}
void OpenGLFrameBuffer::draw3D (float x1, float y1, float z1,
float x2, float y2, float z2,
float x3, float y3, float z3,
float x4, float y4, float z4,
const Colour& colour) const
{
if (pimpl != nullptr)
{
glBindTexture (GL_TEXTURE_2D, pimpl->textureID);
OpenGLHelpers::drawQuad3D (x1, y1, z1, x2, y2, z2, x3, y3, z3, x4, y4, z4, colour);
glBindTexture (GL_TEXTURE_2D, 0);
}
}
void OpenGLFrameBuffer::drawAt (float x1, float y1) const
{
if (pimpl != nullptr)
{
glEnable (GL_TEXTURE_2D);
glBindTexture (GL_TEXTURE_2D, pimpl->textureID);
glDisableClientState (GL_COLOR_ARRAY);
glDisableClientState (GL_NORMAL_ARRAY);
const GLfloat vertices[] = { x1, y1,
x1 + pimpl->width, y1,
x1, y1 + pimpl->height,
x1 + pimpl->width, y1 + pimpl->height };
const GLfloat textureCoords[] = { 0, 0, 1.0f, 0, 0, 1.0f, 1.0f, 1.0f };
glEnableClientState (GL_VERTEX_ARRAY);
glVertexPointer (2, GL_FLOAT, 0, vertices);
glEnableClientState (GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer (2, GL_FLOAT, 0, textureCoords);
glDrawArrays (GL_TRIANGLE_STRIP, 0, 4);
glBindTexture (GL_TEXTURE_2D, 0);
}
}
END_JUCE_NAMESPACE
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