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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "WindowSurface.h"
#include "FBConfig.h"
#include "FrameBuffer.h"
#include <GLES/glext.h>
#include "EGLDispatch.h"
#include "GLDispatch.h"
#include "GL2Dispatch.h"
#include <stdio.h>
#include <string.h>
#include "GLErrorLog.h"
WindowSurface::WindowSurface() :
m_fbObj(0),
m_depthRB(0),
m_stencilRB(0),
m_eglSurface(NULL),
m_attachedColorBuffer(NULL),
m_readContext(NULL),
m_drawContext(NULL),
m_width(0),
m_height(0),
m_pbufWidth(0),
m_pbufHeight(0)
{
}
WindowSurface::~WindowSurface()
{
s_egl.eglDestroySurface(FrameBuffer::getFB()->getDisplay(), m_eglSurface);
}
WindowSurface *WindowSurface::create(int p_config, int p_width, int p_height)
{
const FBConfig *fbconf = FBConfig::get(p_config);
if (!fbconf) {
return NULL;
}
// allocate space for the WindowSurface object
WindowSurface *win = new WindowSurface();
if (!win) {
return NULL;
}
win->m_fbconf = fbconf;
//
// Create a pbuffer to be used as the egl surface
// for that window.
//
if (!win->resizePbuffer(p_width, p_height)) {
delete win;
return NULL;
}
win->m_width = p_width;
win->m_height = p_height;
return win;
}
//
// flushColorBuffer - The function makes sure that the
// previous attached color buffer is updated, if copy or blit should be done
// in order to update it - it is being done here.
//
bool WindowSurface::flushColorBuffer()
{
if (m_attachedColorBuffer.Ptr() != NULL) {
return blitToColorBuffer();
}
return true;
}
//
// setColorBuffer - this function is called when a new color buffer needs to
// be attached to the surface. The function doesn't make sure that the
// previous attached color buffer is updated, this is done by flushColorBuffer
//
void WindowSurface::setColorBuffer(ColorBufferPtr p_colorBuffer)
{
m_attachedColorBuffer = p_colorBuffer;
//
// resize the window if the attached color buffer is of different
// size
//
unsigned int cbWidth = m_attachedColorBuffer->getWidth();
unsigned int cbHeight = m_attachedColorBuffer->getHeight();
if (cbWidth != m_width || cbHeight != m_height) {
if (m_pbufWidth && m_pbufHeight) {
// if we use pbuffer, need to resize it
resizePbuffer(cbWidth, cbHeight);
}
m_width = cbWidth;
m_height = cbHeight;
}
}
//
// This function is called after the context and eglSurface is already
// bound in the current thread (eglMakeCurrent has been called).
// This function should take actions required on the other surface objects
// when being bind/unbound
//
void WindowSurface::bind(RenderContextPtr p_ctx, SurfaceBindType p_bindType)
{
if (p_bindType == SURFACE_BIND_READ) {
m_readContext = p_ctx;
}
else if (p_bindType == SURFACE_BIND_DRAW) {
m_drawContext = p_ctx;
}
else if (p_bindType == SURFACE_BIND_READDRAW) {
m_readContext = p_ctx;
m_drawContext = p_ctx;
}
else {
return; // bad param
}
}
bool WindowSurface::blitToColorBuffer()
{
if (!m_width && !m_height) return false;
if (m_attachedColorBuffer->getWidth() != m_width ||
m_attachedColorBuffer->getHeight() != m_height) {
// XXX: should never happen - how this needs to be handled?
fprintf(stderr, "Dimensions do not match\n");
return false;
}
//
// Make the surface current
//
EGLContext prevContext = s_egl.eglGetCurrentContext();
EGLSurface prevReadSurf = s_egl.eglGetCurrentSurface(EGL_READ);
EGLSurface prevDrawSurf = s_egl.eglGetCurrentSurface(EGL_DRAW);
FrameBuffer *fb = FrameBuffer::getFB();
if (!m_drawContext.Ptr()) {
fprintf(stderr, "Draw context is NULL\n");
return false;
}
if (!s_egl.eglMakeCurrent(fb->getDisplay(), m_eglSurface,
m_eglSurface, m_drawContext->getEGLContext())) {
fprintf(stderr, "Error making draw context current\n");
return false;
}
m_attachedColorBuffer->blitFromCurrentReadBuffer();
// restore current context/surface
s_egl.eglMakeCurrent(fb->getDisplay(), prevDrawSurf,
prevReadSurf, prevContext);
return true;
}
bool WindowSurface::resizePbuffer(unsigned int p_width, unsigned int p_height)
{
if (m_eglSurface &&
m_pbufWidth == p_width &&
m_pbufHeight == p_height) {
// no need to resize
return true;
}
FrameBuffer *fb = FrameBuffer::getFB();
EGLContext prevContext = s_egl.eglGetCurrentContext();
EGLSurface prevReadSurf = s_egl.eglGetCurrentSurface(EGL_READ);
EGLSurface prevDrawSurf = s_egl.eglGetCurrentSurface(EGL_DRAW);
EGLSurface prevPbuf = m_eglSurface;
bool needRebindContext = m_eglSurface &&
(prevReadSurf == m_eglSurface ||
prevDrawSurf == m_eglSurface);
if (needRebindContext) {
s_egl.eglMakeCurrent(fb->getDisplay(), EGL_NO_SURFACE,
EGL_NO_SURFACE, EGL_NO_CONTEXT);
}
//
// Destroy previous surface
//
if (m_eglSurface) {
s_egl.eglDestroySurface(fb->getDisplay(), m_eglSurface);
m_eglSurface = NULL;
}
//
// Create pbuffer surface.
//
EGLint pbufAttribs[5];
pbufAttribs[0] = EGL_WIDTH;
pbufAttribs[1] = p_width;
pbufAttribs[2] = EGL_HEIGHT;
pbufAttribs[3] = p_height;
pbufAttribs[4] = EGL_NONE;
m_eglSurface = s_egl.eglCreatePbufferSurface(fb->getDisplay(),
m_fbconf->getEGLConfig(),
pbufAttribs);
if (m_eglSurface == EGL_NO_SURFACE) {
fprintf(stderr, "Renderer error: failed to create/resize pbuffer!!\n");
return false;
}
m_pbufWidth = p_width;
m_pbufHeight = p_height;
if (needRebindContext) {
s_egl.eglMakeCurrent(fb->getDisplay(),
(prevDrawSurf==prevPbuf) ? m_eglSurface : prevDrawSurf,
(prevReadSurf==prevPbuf) ? m_eglSurface : prevReadSurf,
prevContext);
}
return true;
}
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