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/**
* @file llrendertarget.h
* @brief Off screen render target abstraction. Loose wrapper for GL_EXT_framebuffer_objects.
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#ifndef LL_LLRENDERTARGET_H
#define LL_LLRENDERTARGET_H
// LLRenderTarget is unavailible on the mapserver since it uses FBOs.
#include "llgl.h"
#include "llrender.h"
/*
Wrapper around OpenGL framebuffer objects for use in render-to-texture
SAMPLE USAGE:
LLRenderTarget target;
...
//allocate a 256x256 RGBA render target with depth buffer
target.allocate(256,256,GL_RGBA,TRUE);
//render to contents of offscreen buffer
target.bindTarget();
target.clear();
... <issue drawing commands> ...
target.flush();
...
//use target as a texture
gGL.getTexUnit(INDEX)->bind(&target);
... <issue drawing commands> ...
*/
class LLRenderTarget
{
public:
//whether or not to use FBO implementation
static bool sUseFBO;
static U32 sBytesAllocated;
static U32 sCurFBO;
static U32 sCurResX;
static U32 sCurResY;
LLRenderTarget();
~LLRenderTarget();
//allocate resources for rendering
//must be called before use
//multiple calls will release previously allocated resources
// resX - width
// resY - height
// color_fmt - GL color format (e.g. GL_RGB)
// depth - if true, allocate a depth buffer
// usage - deprecated, should always be TT_TEXTURE
bool allocate(U32 resx, U32 resy, U32 color_fmt, bool depth = false, LLTexUnit::eTextureType usage = LLTexUnit::TT_TEXTURE, LLTexUnit::eTextureMipGeneration generateMipMaps = LLTexUnit::TMG_NONE);
//resize existing attachments to use new resolution and color format
// CAUTION: if the GL runs out of memory attempting to resize, this render target will be undefined
// DO NOT use for screen space buffers or for scratch space for an image that might be uploaded
// DO use for render targets that resize often and aren't likely to ruin someone's day if they break
void resize(U32 resx, U32 resy);
//point this render target at a particular LLImageGL
// Intended usage:
// LLRenderTarget target;
// target.addColorAttachment(image);
// target.bindTarget();
// < issue GL calls>
// target.flush();
// target.releaseColorAttachment();
//
// attachment -- LLImageGL to render into
// use_name -- optional texture name to target instead of attachment->getTexName()
// NOTE: setColorAttachment and releaseColorAttachment cannot be used in conjuction with
// addColorAttachment, allocateDepth, resize, etc.
void setColorAttachment(LLImageGL* attachment, LLGLuint use_name = 0);
// detach from current color attachment
void releaseColorAttachment();
//add color buffer attachment
//limit of 4 color attachments per render target
bool addColorAttachment(U32 color_fmt);
//allocate a depth texture
bool allocateDepth();
//share depth buffer with provided render target
void shareDepthBuffer(LLRenderTarget& target);
//free any allocated resources
//safe to call redundantly
// asserts that this target is not currently bound or present in the RT stack
void release();
//bind target for rendering
//applies appropriate viewport
// If an LLRenderTarget is currently bound, stores a reference to that LLRenderTarget
// and restores previous binding on flush() (maintains a stack of Render Targets)
// Asserts that this target is not currently bound in the stack
void bindTarget();
//clear render targer, clears depth buffer if present,
//uses scissor rect if in copy-to-texture mode
// asserts that this target is currently bound
void clear(U32 mask = 0xFFFFFFFF);
//get applied viewport
void getViewport(S32* viewport);
//get X resolution
U32 getWidth() const { return mResX; }
//get Y resolution
U32 getHeight() const { return mResY; }
LLTexUnit::eTextureType getUsage(void) const { return mUsage; }
U32 getTexture(U32 attachment = 0) const;
U32 getNumTextures() const;
U32 getDepth(void) const { return mDepth; }
void bindTexture(U32 index, S32 channel, LLTexUnit::eTextureFilterOptions filter_options = LLTexUnit::TFO_BILINEAR);
//flush rendering operations
//must be called when rendering is complete
//should be used 1:1 with bindTarget
// call bindTarget once, do all your rendering, call flush once
// If an LLRenderTarget was bound when bindTarget was called, binds that RenderTarget for rendering (maintains RT stack)
// asserts that this target is currently bound
void flush();
//Returns TRUE if target is ready to be rendered into.
//That is, if the target has been allocated with at least
//one renderable attachment (i.e. color buffer, depth buffer).
bool isComplete() const;
// Returns true if this RenderTarget is bound somewhere in the stack
bool isBoundInStack() const;
static LLRenderTarget* getCurrentBoundTarget() { return sBoundTarget; }
// *HACK
void swapFBORefs(LLRenderTarget& other);
protected:
U32 mResX;
U32 mResY;
std::vector<U32> mTex;
std::vector<U32> mInternalFormat;
U32 mFBO;
LLRenderTarget* mPreviousRT = nullptr;
U32 mDepth;
bool mUseDepth;
LLTexUnit::eTextureMipGeneration mGenerateMipMaps;
U32 mMipLevels;
LLTexUnit::eTextureType mUsage;
static LLRenderTarget* sBoundTarget;
};
#endif
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