mirror of
https://github.com/juce-framework/JUCE.git
synced 2026-01-10 23:44:24 +00:00
391 lines
12 KiB
C++
391 lines
12 KiB
C++
/*
|
|
==============================================================================
|
|
|
|
This file is part of the JUCE framework.
|
|
Copyright (c) Raw Material Software Limited
|
|
|
|
JUCE is an open source framework subject to commercial or open source
|
|
licensing.
|
|
|
|
By downloading, installing, or using the JUCE framework, or combining the
|
|
JUCE framework with any other source code, object code, content or any other
|
|
copyrightable work, you agree to the terms of the JUCE End User Licence
|
|
Agreement, and all incorporated terms including the JUCE Privacy Policy and
|
|
the JUCE Website Terms of Service, as applicable, which will bind you. If you
|
|
do not agree to the terms of these agreements, we will not license the JUCE
|
|
framework to you, and you must discontinue the installation or download
|
|
process and cease use of the JUCE framework.
|
|
|
|
JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
|
|
JUCE Privacy Policy: https://juce.com/juce-privacy-policy
|
|
JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
|
|
|
|
Or:
|
|
|
|
You may also use this code under the terms of the AGPLv3:
|
|
https://www.gnu.org/licenses/agpl-3.0.en.html
|
|
|
|
THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
|
|
WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
|
|
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
|
|
|
|
==============================================================================
|
|
*/
|
|
|
|
namespace juce
|
|
{
|
|
|
|
class OpenGLFrameBuffer::Pimpl
|
|
{
|
|
public:
|
|
/* Stores the currently-bound texture on construction, and re-binds it on destruction. */
|
|
struct ScopedTextureBinding
|
|
{
|
|
ScopedTextureBinding()
|
|
{
|
|
glGetIntegerv (GL_TEXTURE_BINDING_2D, &prev);
|
|
JUCE_CHECK_OPENGL_ERROR
|
|
}
|
|
|
|
~ScopedTextureBinding()
|
|
{
|
|
glBindTexture (GL_TEXTURE_2D, (GLuint) prev);
|
|
JUCE_CHECK_OPENGL_ERROR
|
|
}
|
|
|
|
GLint prev{};
|
|
};
|
|
|
|
Pimpl (OpenGLContext& c, const int w, const int h,
|
|
const bool wantsDepthBuffer, const bool wantsStencilBuffer)
|
|
: context (c), width (w), height (h),
|
|
textureID (0), frameBufferID (0), depthOrStencilBuffer (0),
|
|
hasDepthBuffer (false), hasStencilBuffer (false)
|
|
{
|
|
// Framebuffer objects can only be created when the current thread has an active OpenGL
|
|
// context. You'll need to create this object in one of the OpenGLContext's callbacks.
|
|
jassert (OpenGLHelpers::isContextActive());
|
|
|
|
#if JUCE_WINDOWS || JUCE_LINUX || JUCE_BSD
|
|
if (context.extensions.glGenFramebuffers == nullptr)
|
|
return;
|
|
#endif
|
|
|
|
context.extensions.glGenFramebuffers (1, &frameBufferID);
|
|
bind();
|
|
|
|
{
|
|
const ScopedTextureBinding scopedTextureBinding;
|
|
|
|
glGenTextures (1, &textureID);
|
|
glBindTexture (GL_TEXTURE_2D, textureID);
|
|
JUCE_CHECK_OPENGL_ERROR
|
|
|
|
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
|
|
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
|
|
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
|
|
glTexParameteri (GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
|
|
JUCE_CHECK_OPENGL_ERROR
|
|
|
|
glTexImage2D (GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
|
|
JUCE_CHECK_OPENGL_ERROR
|
|
}
|
|
|
|
context.extensions.glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, textureID, 0);
|
|
|
|
if (wantsDepthBuffer || wantsStencilBuffer)
|
|
{
|
|
context.extensions.glGenRenderbuffers (1, &depthOrStencilBuffer);
|
|
context.extensions.glBindRenderbuffer (GL_RENDERBUFFER, depthOrStencilBuffer);
|
|
jassert (context.extensions.glIsRenderbuffer (depthOrStencilBuffer));
|
|
|
|
context.extensions.glRenderbufferStorage (GL_RENDERBUFFER,
|
|
(wantsDepthBuffer && wantsStencilBuffer) ? (GLenum) GL_DEPTH24_STENCIL8
|
|
#if JUCE_OPENGL_ES
|
|
: (GLenum) GL_DEPTH_COMPONENT16,
|
|
#else
|
|
: (GLenum) GL_DEPTH_COMPONENT,
|
|
#endif
|
|
width, height);
|
|
|
|
GLint params = 0;
|
|
context.extensions.glGetRenderbufferParameteriv (GL_RENDERBUFFER, GL_RENDERBUFFER_DEPTH_SIZE, ¶ms);
|
|
context.extensions.glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depthOrStencilBuffer);
|
|
|
|
if (wantsStencilBuffer)
|
|
context.extensions.glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, depthOrStencilBuffer);
|
|
|
|
hasDepthBuffer = wantsDepthBuffer;
|
|
hasStencilBuffer = wantsStencilBuffer;
|
|
}
|
|
|
|
unbind();
|
|
}
|
|
|
|
~Pimpl()
|
|
{
|
|
if (OpenGLHelpers::isContextActive())
|
|
{
|
|
if (textureID != 0)
|
|
glDeleteTextures (1, &textureID);
|
|
|
|
if (depthOrStencilBuffer != 0)
|
|
context.extensions.glDeleteRenderbuffers (1, &depthOrStencilBuffer);
|
|
|
|
if (frameBufferID != 0)
|
|
context.extensions.glDeleteFramebuffers (1, &frameBufferID);
|
|
|
|
JUCE_CHECK_OPENGL_ERROR
|
|
}
|
|
}
|
|
|
|
bool createdOk() const
|
|
{
|
|
return frameBufferID != 0 && textureID != 0;
|
|
}
|
|
|
|
void bind()
|
|
{
|
|
glGetIntegerv (GL_FRAMEBUFFER_BINDING, &prevFramebuffer);
|
|
context.extensions.glBindFramebuffer (GL_FRAMEBUFFER, frameBufferID);
|
|
JUCE_CHECK_OPENGL_ERROR
|
|
}
|
|
|
|
void unbind()
|
|
{
|
|
context.extensions.glBindFramebuffer (GL_FRAMEBUFFER, (GLuint) prevFramebuffer);
|
|
JUCE_CHECK_OPENGL_ERROR
|
|
}
|
|
|
|
OpenGLContext& context;
|
|
const int width, height;
|
|
GLuint textureID, frameBufferID, depthOrStencilBuffer;
|
|
bool hasDepthBuffer, hasStencilBuffer;
|
|
|
|
private:
|
|
GLint prevFramebuffer{};
|
|
|
|
bool checkStatus() noexcept
|
|
{
|
|
const GLenum status = context.extensions.glCheckFramebufferStatus (GL_FRAMEBUFFER);
|
|
|
|
return status == GL_NO_ERROR
|
|
|| status == GL_FRAMEBUFFER_COMPLETE;
|
|
}
|
|
|
|
JUCE_DECLARE_NON_COPYABLE (Pimpl)
|
|
};
|
|
|
|
//==============================================================================
|
|
class OpenGLFrameBuffer::SavedState
|
|
{
|
|
public:
|
|
SavedState (OpenGLFrameBuffer& buffer, const int w, const int h)
|
|
: width (w), height (h),
|
|
data ((size_t) (w * h))
|
|
{
|
|
buffer.readPixels (data, Rectangle<int> (w, h));
|
|
}
|
|
|
|
bool restore (OpenGLContext& context, OpenGLFrameBuffer& buffer)
|
|
{
|
|
if (buffer.initialise (context, 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 (OpenGLContext& context, int width, int height)
|
|
{
|
|
jassert (context.isActive()); // The context must be active when creating a framebuffer!
|
|
|
|
pimpl.reset();
|
|
pimpl.reset (new Pimpl (context, width, height, false, false));
|
|
|
|
if (! pimpl->createdOk())
|
|
pimpl.reset();
|
|
|
|
return pimpl != nullptr;
|
|
}
|
|
|
|
bool OpenGLFrameBuffer::initialise (OpenGLContext& context, const Image& image)
|
|
{
|
|
if (! image.isARGB())
|
|
return initialise (context, image.convertedToFormat (Image::ARGB));
|
|
|
|
Image::BitmapData bitmap (image, Image::BitmapData::readOnly);
|
|
|
|
return initialise (context, bitmap.width, bitmap.height)
|
|
&& writePixels ((const PixelARGB*) bitmap.data, image.getBounds());
|
|
}
|
|
|
|
bool OpenGLFrameBuffer::initialise (OpenGLFrameBuffer& other)
|
|
{
|
|
auto* p = other.pimpl.get();
|
|
|
|
if (p == nullptr)
|
|
{
|
|
pimpl.reset();
|
|
return true;
|
|
}
|
|
|
|
const Rectangle<int> area (pimpl->width, pimpl->height);
|
|
|
|
if (initialise (p->context, area.getWidth(), area.getHeight()))
|
|
{
|
|
pimpl->bind();
|
|
|
|
#if ! JUCE_ANDROID
|
|
if (! pimpl->context.isCoreProfile())
|
|
glEnable (GL_TEXTURE_2D);
|
|
|
|
clearGLError();
|
|
#endif
|
|
{
|
|
const Pimpl::ScopedTextureBinding scopedTextureBinding;
|
|
glBindTexture (GL_TEXTURE_2D, p->textureID);
|
|
pimpl->context.copyTexture (area, area, area.getWidth(), area.getHeight(), false);
|
|
}
|
|
|
|
pimpl->unbind();
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void OpenGLFrameBuffer::release()
|
|
{
|
|
pimpl.reset();
|
|
savedState.reset();
|
|
}
|
|
|
|
void OpenGLFrameBuffer::saveAndRelease()
|
|
{
|
|
if (pimpl != nullptr)
|
|
{
|
|
savedState.reset (new SavedState (*this, pimpl->width, pimpl->height));
|
|
pimpl.reset();
|
|
}
|
|
}
|
|
|
|
bool OpenGLFrameBuffer::reloadSavedCopy (OpenGLContext& context)
|
|
{
|
|
if (savedState != nullptr)
|
|
{
|
|
std::unique_ptr<SavedState> state;
|
|
std::swap (state, savedState);
|
|
|
|
if (state->restore (context, *this))
|
|
return true;
|
|
|
|
std::swap (state, savedState);
|
|
}
|
|
|
|
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);
|
|
|
|
if (pimpl == nullptr)
|
|
return false;
|
|
|
|
pimpl->bind();
|
|
return true;
|
|
}
|
|
|
|
GLuint OpenGLFrameBuffer::getFrameBufferID() const noexcept
|
|
{
|
|
return pimpl != nullptr ? pimpl->frameBufferID : 0;
|
|
}
|
|
|
|
GLuint OpenGLFrameBuffer::getCurrentFrameBufferTarget() noexcept
|
|
{
|
|
GLint fb = {};
|
|
glGetIntegerv (GL_FRAMEBUFFER_BINDING, &fb);
|
|
return (GLuint) fb;
|
|
}
|
|
|
|
void OpenGLFrameBuffer::releaseAsRenderingTarget()
|
|
{
|
|
if (pimpl != nullptr)
|
|
pimpl->unbind();
|
|
}
|
|
|
|
void OpenGLFrameBuffer::clear (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(),
|
|
JUCE_RGBA_FORMAT, GL_UNSIGNED_BYTE, target);
|
|
|
|
pimpl->unbind();
|
|
return true;
|
|
}
|
|
|
|
bool OpenGLFrameBuffer::writePixels (const PixelARGB* data, const Rectangle<int>& area)
|
|
{
|
|
OpenGLTargetSaver ts (pimpl->context);
|
|
|
|
if (! makeCurrentRenderingTarget())
|
|
return false;
|
|
|
|
glDisable (GL_DEPTH_TEST);
|
|
glDisable (GL_BLEND);
|
|
JUCE_CHECK_OPENGL_ERROR
|
|
|
|
OpenGLTexture tex;
|
|
tex.loadARGB (data, area.getWidth(), area.getHeight());
|
|
|
|
glViewport (0, 0, pimpl->width, pimpl->height);
|
|
pimpl->context.copyTexture (area, Rectangle<int> (area.getX(), area.getY(),
|
|
tex.getWidth(), tex.getHeight()),
|
|
pimpl->width, pimpl->height, true, false);
|
|
|
|
JUCE_CHECK_OPENGL_ERROR
|
|
return true;
|
|
}
|
|
|
|
} // namespace juce
|