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#import "iosOGLContext.h"
#import "base/assert.hpp"
#import "base/logging.cpp"
#import "drape/glfunctions.hpp"
iosOGLContext::iosOGLContext(CAEAGLLayer * layer, iosOGLContext * contextToShareWith, bool needBuffers)
: m_layer(layer)
, m_nativeContext(NULL)
, m_needBuffers(needBuffers)
, m_hasBuffers(false)
, m_renderBufferId(0)
, m_depthBufferId(0)
, m_frameBufferId(0)
, m_presentAvailable(true)
{
if (contextToShareWith != NULL)
{
m_nativeContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2
sharegroup: contextToShareWith->m_nativeContext.sharegroup];
}
else
m_nativeContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
}
iosOGLContext::~iosOGLContext()
{
destroyBuffers();
}
void iosOGLContext::makeCurrent()
{
ASSERT(m_nativeContext != NULL, ());
[EAGLContext setCurrentContext: m_nativeContext];
if (m_needBuffers && !m_hasBuffers)
initBuffers();
}
void iosOGLContext::setPresentAvailable(bool available)
{
m_presentAvailable = available;
}
void iosOGLContext::present()
{
ASSERT(m_nativeContext != NULL, ());
ASSERT(m_renderBufferId, ());
GLenum const discards[] = { GL_DEPTH_ATTACHMENT, GL_COLOR_ATTACHMENT0 };
GLCHECK(glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, discards));
glBindRenderbuffer(GL_RENDERBUFFER, m_renderBufferId);
if (m_presentAvailable)
[m_nativeContext presentRenderbuffer: GL_RENDERBUFFER];
GLCHECK(glDiscardFramebufferEXT(GL_FRAMEBUFFER, 1, discards + 1));
}
void iosOGLContext::setDefaultFramebuffer()
{
ASSERT(m_frameBufferId, ());
glBindFramebuffer(GL_FRAMEBUFFER, m_frameBufferId);
}
void iosOGLContext::resize(int w, int h)
{
if (m_needBuffers && m_hasBuffers)
{
GLint width = 0;
GLint height = 0;
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &width);
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &height);
if (width == w && height == h)
return;
destroyBuffers();
initBuffers();
}
}
void iosOGLContext::initBuffers()
{
ASSERT(m_needBuffers, ());
if (!m_hasBuffers)
{
// Color
glGenRenderbuffers(1, &m_renderBufferId);
glBindRenderbuffer(GL_RENDERBUFFER, m_renderBufferId);
[m_nativeContext renderbufferStorage:GL_RENDERBUFFER fromDrawable: m_layer];
// color
// Depth
GLint width = 0;
GLint height = 0;
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &width);
glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &height);
glGenRenderbuffers(1, &m_depthBufferId);
glBindRenderbuffer(GL_RENDERBUFFER, m_depthBufferId);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width, height);
// depth
// Framebuffer
glGenFramebuffers(1, &m_frameBufferId);
glBindFramebuffer(GL_FRAMEBUFFER, m_frameBufferId);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, m_renderBufferId);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, m_depthBufferId);
GLint fbStatus = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (fbStatus != GL_FRAMEBUFFER_COMPLETE)
LOG(LERROR, ("Incomplete framebuffer:", fbStatus));
// framebuffer
m_hasBuffers = true;
}
}
void iosOGLContext::destroyBuffers()
{
if (m_needBuffers && m_hasBuffers)
{
glFinish();
glBindFramebuffer(GL_FRAMEBUFFER, m_frameBufferId);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, 0);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, 0);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glDeleteFramebuffers(1, &m_frameBufferId);
glDeleteRenderbuffers(1, &m_renderBufferId);
glDeleteRenderbuffers(1, &m_depthBufferId);
m_hasBuffers = false;
}
}
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