nuclear@0: /************************************************************************************
nuclear@0: 
nuclear@0: Filename    :   CAPI_GL_Util.cpp
nuclear@0: Content     :   RenderDevice implementation for OpenGL
nuclear@0: Created     :   September 10, 2012
nuclear@0: Authors     :   David Borel, Andrew Reisse
nuclear@0: 
nuclear@0: Copyright   :   Copyright 2014 Oculus VR, LLC All Rights reserved.
nuclear@0: 
nuclear@0: Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License");
nuclear@0: you may not use the Oculus VR Rift SDK except in compliance with the License,
nuclear@0: which is provided at the time of installation or download, or which
nuclear@0: otherwise accompanies this software in either electronic or hard copy form.
nuclear@0: 
nuclear@0: You may obtain a copy of the License at
nuclear@0: 
nuclear@0: http://www.oculusvr.com/licenses/LICENSE-3.2
nuclear@0: 
nuclear@0: Unless required by applicable law or agreed to in writing, the Oculus VR SDK
nuclear@0: distributed under the License is distributed on an "AS IS" BASIS,
nuclear@0: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nuclear@0: See the License for the specific language governing permissions and
nuclear@0: limitations under the License.
nuclear@0: 
nuclear@0: ************************************************************************************/
nuclear@0: 
nuclear@0: #include "CAPI_GL_Util.h"
nuclear@0: #include "../../Kernel/OVR_Log.h"
nuclear@0: #include <string.h>
nuclear@0: 
nuclear@0: #if defined(OVR_OS_LINUX)
nuclear@0:  #include "../../Displays/OVR_Linux_SDKWindow.h"
nuclear@0: #endif
nuclear@0: 
nuclear@0: #if defined(OVR_OS_MAC)
nuclear@0:     #include <CoreGraphics/CGDirectDisplay.h>
nuclear@0:     #include <OpenGL/OpenGL.h>
nuclear@0: 
nuclear@0: typedef void *CGSConnectionID;
nuclear@0: typedef int32_t CGSWindowID;
nuclear@0: typedef int32_t CGSSurfaceID;
nuclear@0: 
nuclear@0: extern "C" CGLError CGLGetSurface(CGLContextObj ctx, CGSConnectionID *cid, CGSWindowID *wid, CGSSurfaceID *sid);
nuclear@0: extern "C" CGLError CGLSetSurface(CGLContextObj ctx, CGSConnectionID cid, CGSWindowID wid, CGSSurfaceID sid);
nuclear@0: #endif
nuclear@0: 
nuclear@0: 
nuclear@0: 
nuclear@0: 
nuclear@0: namespace OVR {
nuclear@0: 
nuclear@0: 
nuclear@0: OVR::GLEContext gleContext;
nuclear@0: 
nuclear@0: 
nuclear@0: OVR::GLEContext* GetGLEContext()
nuclear@0: {
nuclear@0:     return &gleContext;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: namespace CAPI { namespace GL {
nuclear@0: 
nuclear@0: 
nuclear@0: void InitGLExtensions()
nuclear@0: {
nuclear@0:     if(!gleContext.IsInitialized())
nuclear@0:     {
nuclear@0:         gleContext.SetCurrentContext(&gleContext);
nuclear@0:         gleContext.Init();
nuclear@0:     }
nuclear@0: }
nuclear@0:     
nuclear@0:     
nuclear@0: Buffer::Buffer(RenderParams* rp) : pParams(rp), Size(0), Use(0), GLBuffer(0)
nuclear@0: {
nuclear@0: }
nuclear@0: 
nuclear@0: Buffer::~Buffer()
nuclear@0: {
nuclear@0:     if (GLBuffer)
nuclear@0:         glDeleteBuffers(1, &GLBuffer);
nuclear@0: }
nuclear@0: 
nuclear@0: bool Buffer::Data(int use, const void* buffer, size_t size)
nuclear@0: {
nuclear@0:     Size = size;
nuclear@0: 
nuclear@0:     switch (use & Buffer_TypeMask)
nuclear@0:     {
nuclear@0:     case Buffer_Index:     Use = GL_ELEMENT_ARRAY_BUFFER; break;
nuclear@0:     default:               Use = GL_ARRAY_BUFFER; break;
nuclear@0:     }
nuclear@0: 
nuclear@0:     if (!GLBuffer)
nuclear@0:         glGenBuffers(1, &GLBuffer);
nuclear@0: 
nuclear@0:     int mode = GL_DYNAMIC_DRAW;
nuclear@0:     if (use & Buffer_ReadOnly)
nuclear@0:         mode = GL_STATIC_DRAW;
nuclear@0: 
nuclear@0:     glBindBuffer(Use, GLBuffer);
nuclear@0:     glBufferData(Use, size, buffer, mode);
nuclear@0:     return 1;
nuclear@0: }
nuclear@0: 
nuclear@0: void* Buffer::Map(size_t, size_t, int)
nuclear@0: {
nuclear@0:     int mode = GL_WRITE_ONLY;
nuclear@0:     //if (flags & Map_Unsynchronized)
nuclear@0:     //    mode |= GL_MAP_UNSYNCHRONIZED;
nuclear@0:     
nuclear@0:     glBindBuffer(Use, GLBuffer);
nuclear@0:     void* v = glMapBuffer(Use, mode);
nuclear@0:     return v;
nuclear@0: }
nuclear@0: 
nuclear@0: bool Buffer::Unmap(void*)
nuclear@0: {
nuclear@0:     glBindBuffer(Use, GLBuffer);
nuclear@0:     int r = glUnmapBuffer(Use);
nuclear@0:     return r != 0;
nuclear@0: }
nuclear@0: 
nuclear@0: ShaderSet::ShaderSet() : 
nuclear@0:   //Shaders[],
nuclear@0:     UniformInfo(),
nuclear@0:   //Prog(0)
nuclear@0:     ProjLoc(0),
nuclear@0:     ViewLoc(0),
nuclear@0:   //TexLoc[],
nuclear@0:     UsesLighting(false),
nuclear@0:     LightingVer(0)
nuclear@0: {
nuclear@0:     memset(TexLoc, 0, sizeof(TexLoc));
nuclear@0:     Prog = glCreateProgram();
nuclear@0: }
nuclear@0: ShaderSet::~ShaderSet()
nuclear@0: {
nuclear@0:     glDeleteProgram(Prog);
nuclear@0: }
nuclear@0: 
nuclear@0: GLint ShaderSet::GetGLShader(Shader* s)
nuclear@0: {
nuclear@0:     switch (s->Stage)
nuclear@0:     {
nuclear@0:     case Shader_Vertex: {
nuclear@0:         ShaderImpl<Shader_Vertex, GL_VERTEX_SHADER>* gls = (ShaderImpl<Shader_Vertex, GL_VERTEX_SHADER>*)s;
nuclear@0:         return gls->GLShader;
nuclear@0:     } break;
nuclear@0:     case Shader_Fragment: {
nuclear@0:         ShaderImpl<Shader_Fragment, GL_FRAGMENT_SHADER>* gls = (ShaderImpl<Shader_Fragment, GL_FRAGMENT_SHADER>*)s;
nuclear@0:         return gls->GLShader;
nuclear@0:     } break;
nuclear@0:     default: break;
nuclear@0:     }
nuclear@0: 
nuclear@0:     return -1;
nuclear@0: }
nuclear@0: 
nuclear@0: void ShaderSet::SetShader(Shader *s)
nuclear@0: {
nuclear@0:     Shaders[s->Stage] = s;
nuclear@0:     GLint GLShader = GetGLShader(s);
nuclear@0:     glAttachShader(Prog, GLShader);
nuclear@0:     if (Shaders[Shader_Vertex] && Shaders[Shader_Fragment])
nuclear@0:         Link();
nuclear@0: }
nuclear@0: 
nuclear@0: void ShaderSet::UnsetShader(int stage)
nuclear@0: {
nuclear@0:     if (Shaders[stage] == NULL)
nuclear@0:         return;
nuclear@0: 
nuclear@0:     GLint GLShader = GetGLShader(Shaders[stage]);
nuclear@0:     glDetachShader(Prog, GLShader);
nuclear@0: 
nuclear@0:     Shaders[stage] = NULL;
nuclear@0: }
nuclear@0: 
nuclear@0: bool ShaderSet::SetUniform(const char* name, int n, const float* v)
nuclear@0: {
nuclear@0:     for (unsigned int i = 0; i < UniformInfo.GetSize(); i++)
nuclear@0:         if (!strcmp(UniformInfo[i].Name.ToCStr(), name))
nuclear@0:         {
nuclear@0:             OVR_ASSERT(UniformInfo[i].Location >= 0);
nuclear@0:             glUseProgram(Prog);
nuclear@0:             switch (UniformInfo[i].Type)
nuclear@0:             {
nuclear@0:             case 1:   glUniform1fv(UniformInfo[i].Location, n, v); break;
nuclear@0:             case 2:   glUniform2fv(UniformInfo[i].Location, n/2, v); break;
nuclear@0:             case 3:   glUniform3fv(UniformInfo[i].Location, n/3, v); break;
nuclear@0:             case 4:   glUniform4fv(UniformInfo[i].Location, n/4, v); break;
nuclear@0:             case 12:  glUniformMatrix3fv(UniformInfo[i].Location, 1, 1, v); break;
nuclear@0:             case 16:  glUniformMatrix4fv(UniformInfo[i].Location, 1, 1, v); break;
nuclear@0:             default: OVR_ASSERT(0);
nuclear@0:             }
nuclear@0:             return 1;
nuclear@0:         }
nuclear@0: 
nuclear@0:     OVR_DEBUG_LOG(("Warning: uniform %s not present in selected shader", name));
nuclear@0:     return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: bool ShaderSet::Link()
nuclear@0: {
nuclear@0:     glLinkProgram(Prog);
nuclear@0:     GLint r;
nuclear@0:     glGetProgramiv(Prog, GL_LINK_STATUS, &r);
nuclear@0:     if (!r)
nuclear@0:     {
nuclear@0:         GLchar msg[1024];
nuclear@0:         glGetProgramInfoLog(Prog, sizeof(msg), 0, msg);
nuclear@0:         OVR_DEBUG_LOG(("Linking shaders failed: %s\n", msg));
nuclear@0:         if (!r)
nuclear@0:             return 0;
nuclear@0:     }
nuclear@0:     glUseProgram(Prog);
nuclear@0: 
nuclear@0:     UniformInfo.Clear();
nuclear@0:     LightingVer = 0;
nuclear@0:     UsesLighting = 0;
nuclear@0: 
nuclear@0:     GLint uniformCount = 0;
nuclear@0:     glGetProgramiv(Prog, GL_ACTIVE_UNIFORMS, &uniformCount);
nuclear@0:     OVR_ASSERT(uniformCount >= 0);
nuclear@0: 
nuclear@0:     for(GLuint i = 0; i < (GLuint)uniformCount; i++)
nuclear@0:     {
nuclear@0:         GLsizei namelen;
nuclear@0:         GLint size = 0;
nuclear@0:         GLenum type;
nuclear@0:         GLchar name[32];
nuclear@0:         glGetActiveUniform(Prog, i, sizeof(name), &namelen, &size, &type, name);
nuclear@0: 
nuclear@0:         if (size)
nuclear@0:         {
nuclear@0:             int l = glGetUniformLocation(Prog, name);
nuclear@0:             char *np = name;
nuclear@0:             while (*np)
nuclear@0:             {
nuclear@0:                 if (*np == '[')
nuclear@0:                     *np = 0;
nuclear@0:                 np++;
nuclear@0:             }
nuclear@0:             Uniform u;
nuclear@0:             u.Name = name;
nuclear@0:             u.Location = l;
nuclear@0:             u.Size = size;
nuclear@0:             switch (type)
nuclear@0:             {
nuclear@0:             case GL_FLOAT:      u.Type = 1; break;
nuclear@0:             case GL_FLOAT_VEC2: u.Type = 2; break;
nuclear@0:             case GL_FLOAT_VEC3: u.Type = 3; break;
nuclear@0:             case GL_FLOAT_VEC4: u.Type = 4; break;
nuclear@0:             case GL_FLOAT_MAT3: u.Type = 12; break;
nuclear@0:             case GL_FLOAT_MAT4: u.Type = 16; break;
nuclear@0:             default:
nuclear@0:                 continue;
nuclear@0:             }
nuclear@0:             UniformInfo.PushBack(u);
nuclear@0:             if (!strcmp(name, "LightCount"))
nuclear@0:                 UsesLighting = 1;
nuclear@0:         }
nuclear@0:         else
nuclear@0:             break;
nuclear@0:     }
nuclear@0: 
nuclear@0:     ProjLoc = glGetUniformLocation(Prog, "Proj");
nuclear@0:     ViewLoc = glGetUniformLocation(Prog, "View");
nuclear@0:     for (int i = 0; i < 8; i++)
nuclear@0:     {
nuclear@0:         char texv[32];
nuclear@0:         OVR_sprintf(texv, 10, "Texture%d", i);
nuclear@0:         TexLoc[i] = glGetUniformLocation(Prog, texv);
nuclear@0:         if (TexLoc[i] < 0)
nuclear@0:             break;
nuclear@0: 
nuclear@0:         glUniform1i(TexLoc[i], i);
nuclear@0:     }
nuclear@0:     if (UsesLighting)
nuclear@0:         OVR_ASSERT(ProjLoc >= 0 && ViewLoc >= 0);
nuclear@0:     return 1;
nuclear@0: }
nuclear@0: 
nuclear@0: bool ShaderBase::SetUniform(const char* name, int n, const float* v)
nuclear@0: {
nuclear@0:     for(unsigned i = 0; i < UniformReflSize; i++)
nuclear@0:     {
nuclear@0:         if (!strcmp(UniformRefl[i].Name, name))
nuclear@0:         {
nuclear@0:             memcpy(UniformData + UniformRefl[i].Offset, v, n * sizeof(float));
nuclear@0:             return 1;
nuclear@0:         }
nuclear@0:     }
nuclear@0:     return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: bool ShaderBase::SetUniformBool(const char* name, int n, const bool* v) 
nuclear@0: {
nuclear@0:     OVR_UNUSED(n);
nuclear@0:     for(unsigned i = 0; i < UniformReflSize; i++)
nuclear@0:     {
nuclear@0:         if (!strcmp(UniformRefl[i].Name, name))
nuclear@0:         {
nuclear@0:             memcpy(UniformData + UniformRefl[i].Offset, v, UniformRefl[i].Size);
nuclear@0:             return 1;
nuclear@0:         }
nuclear@0:     }
nuclear@0:     return 0;
nuclear@0: }
nuclear@0: 
nuclear@0: void ShaderBase::InitUniforms(const Uniform* refl, size_t reflSize)
nuclear@0: {
nuclear@0:     if(!refl)
nuclear@0:     {
nuclear@0:         UniformRefl = NULL;
nuclear@0:         UniformReflSize = 0;
nuclear@0: 
nuclear@0:         UniformsSize = 0;
nuclear@0:         if (UniformData)
nuclear@0:         {
nuclear@0:             OVR_FREE(UniformData);
nuclear@0:             UniformData = 0;
nuclear@0:         }
nuclear@0:         return; // no reflection data
nuclear@0:     }
nuclear@0: 
nuclear@0:     UniformRefl = refl;
nuclear@0:     UniformReflSize = reflSize;
nuclear@0:     
nuclear@0:     UniformsSize = UniformRefl[UniformReflSize-1].Offset + UniformRefl[UniformReflSize-1].Size;
nuclear@0:     UniformData = (unsigned char*)OVR_ALLOC(UniformsSize);
nuclear@0: }
nuclear@0: 
nuclear@0: Texture::Texture(RenderParams* rp, int w, int h) : IsUserAllocated(false), pParams(rp), TexId(0), Width(w), Height(h)
nuclear@0: {
nuclear@0:     if (w && h)
nuclear@0:         glGenTextures(1, &TexId);
nuclear@0: }
nuclear@0: 
nuclear@0: Texture::~Texture()
nuclear@0: {
nuclear@0:     if (TexId && !IsUserAllocated)
nuclear@0:         glDeleteTextures(1, &TexId);
nuclear@0: }
nuclear@0: 
nuclear@0: void Texture::Set(int slot, ShaderStage) const
nuclear@0: {
nuclear@0:     glActiveTexture(GL_TEXTURE0 + slot);
nuclear@0:     glBindTexture(GL_TEXTURE_2D, TexId);
nuclear@0: }
nuclear@0: 
nuclear@0: void Texture::SetSampleMode(int sm)
nuclear@0: {
nuclear@0:     glBindTexture(GL_TEXTURE_2D, TexId);
nuclear@0:     switch (sm & Sample_FilterMask)
nuclear@0:     {
nuclear@0:     case Sample_Linear:
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@0:         if(GLE_EXT_texture_filter_anisotropic)
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1);
nuclear@0:         break;
nuclear@0: 
nuclear@0:     case Sample_Anisotropic:
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@0:         if(GLE_EXT_texture_filter_anisotropic)
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 8);
nuclear@0:         break;
nuclear@0: 
nuclear@0:     case Sample_Nearest:
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
nuclear@0:         if(GLE_EXT_texture_filter_anisotropic)
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, 1);
nuclear@0:         break;
nuclear@0:     }
nuclear@0: 
nuclear@0:     switch (sm & Sample_AddressMask)
nuclear@0:     {
nuclear@0:     case Sample_Repeat:
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
nuclear@0:         break;
nuclear@0: 
nuclear@0:     case Sample_Clamp:
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
nuclear@0:         break;
nuclear@0: 
nuclear@0:     case Sample_ClampBorder:
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
nuclear@0:         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
nuclear@0:         break;
nuclear@0:     }
nuclear@0: }
nuclear@0: 
nuclear@0: void Texture::UpdatePlaceholderTexture(GLuint texId, const Sizei& textureSize)
nuclear@0: {
nuclear@0:     if (!IsUserAllocated && TexId && texId != TexId)
nuclear@0:         glDeleteTextures(1, &TexId);
nuclear@0: 
nuclear@0:     TexId = texId;
nuclear@0:     Width = textureSize.w;
nuclear@0:     Height = textureSize.h;
nuclear@0: 
nuclear@0:     IsUserAllocated = true;
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: 
nuclear@0: 
nuclear@0: 
nuclear@0: Context::Context() : initialized(false), ownsContext(true), incarnation(0)
nuclear@0: {
nuclear@0: #if defined(OVR_OS_MAC)
nuclear@0:     systemContext = 0;
nuclear@0: #elif defined(OVR_OS_WIN32)
nuclear@0:     hdc = 0;
nuclear@0:     systemContext = 0;
nuclear@0: #elif defined(OVR_OS_LINUX)
nuclear@0:     x11Display = NULL;
nuclear@0:     x11Drawable = 0;
nuclear@0:     systemContext = 0;
nuclear@0:     memset(&x11Visual, 0, sizeof(x11Visual));
nuclear@0: #endif
nuclear@0: 
nuclear@0: }
nuclear@0: 
nuclear@0: void Context::InitFromCurrent()
nuclear@0: {
nuclear@0:     Destroy();
nuclear@0: 
nuclear@0:     initialized = true;
nuclear@0:     ownsContext = false;
nuclear@0:     incarnation++;
nuclear@0:     
nuclear@0: #if defined(OVR_OS_MAC)
nuclear@0:     systemContext = CGLGetCurrentContext();
nuclear@0:     {
nuclear@0:         CGSConnectionID cid;
nuclear@0:         CGSWindowID wid;
nuclear@0:         CGSSurfaceID sid;
nuclear@0:         CGLError e  = kCGLNoError;
nuclear@0:         e = CGLGetSurface(systemContext, &cid, &wid, &sid);
nuclear@0:         OVR_ASSERT(e == kCGLNoError); OVR_UNUSED(e);
nuclear@0:     }
nuclear@0: 
nuclear@0: #elif defined(OVR_OS_WIN32)
nuclear@0:     hdc = wglGetCurrentDC();
nuclear@0:     systemContext = wglGetCurrentContext();
nuclear@0: #elif defined(OVR_OS_LINUX)
nuclear@0:     x11Display = glXGetCurrentDisplay();
nuclear@0:     x11Drawable = glXGetCurrentDrawable();
nuclear@0:     systemContext = glXGetCurrentContext();
nuclear@0:     if (!SDKWindow::getVisualFromDrawable(x11Drawable, &x11Visual))
nuclear@0:     {
nuclear@0:         OVR::LogError("[Context] Unable to obtain x11 visual from context");
nuclear@0:         memset(&x11Visual, 0, sizeof(x11Visual));
nuclear@0:     }
nuclear@0: #endif
nuclear@0: }
nuclear@0: 
nuclear@0: 
nuclear@0: void Context::CreateShared( Context & ctx )
nuclear@0: {
nuclear@0:     Destroy();
nuclear@0:     OVR_ASSERT( ctx.initialized == true );
nuclear@0:     if( ctx.initialized == false )
nuclear@0:     {
nuclear@0:         return;
nuclear@0:     }
nuclear@0: 
nuclear@0:     initialized = true;
nuclear@0:     ownsContext = true;
nuclear@0:     incarnation++;
nuclear@0:     
nuclear@0: #if defined(OVR_OS_MAC)
nuclear@0:     CGLPixelFormatObj pixelFormat = CGLGetPixelFormat( ctx.systemContext );
nuclear@0:     CGLError e = CGLCreateContext( pixelFormat, ctx.systemContext, &systemContext );
nuclear@0:     OVR_ASSERT(e == kCGLNoError); OVR_UNUSED(e);
nuclear@0:     SetSurface(ctx);
nuclear@0: #elif defined(OVR_OS_WIN32)
nuclear@0:     hdc = ctx.hdc;
nuclear@0:     systemContext = wglCreateContext( ctx.hdc );
nuclear@0:     BOOL success = wglShareLists(ctx.systemContext, systemContext );
nuclear@0:     OVR_ASSERT( success == TRUE );
nuclear@0:     OVR_UNUSED(success);
nuclear@0: #elif defined(OVR_OS_LINUX)
nuclear@0:     x11Display = ctx.x11Display;
nuclear@0:     x11Drawable = ctx.x11Drawable;
nuclear@0:     x11Visual = ctx.x11Visual;
nuclear@0:         systemContext = glXCreateContext( ctx.x11Display, &x11Visual, ctx.systemContext, True );
nuclear@0:         OVR_ASSERT( systemContext != NULL );
nuclear@0: #endif
nuclear@0: }
nuclear@0: 
nuclear@0: #if defined(OVR_OS_MAC)
nuclear@0: void Context::SetSurface( Context & ctx ) {
nuclear@0:     CGLError e = kCGLNoError;
nuclear@0:     CGSConnectionID cid, cid2;
nuclear@0:     CGSWindowID wid, wid2;
nuclear@0:     CGSSurfaceID sid, sid2;
nuclear@0: 
nuclear@0:     e = CGLGetSurface(ctx.systemContext, &cid, &wid, &sid);
nuclear@0:     OVR_ASSERT(e == kCGLNoError); OVR_UNUSED(e);
nuclear@0:     e = CGLGetSurface(systemContext, &cid2, &wid2, &sid2);
nuclear@0:     OVR_ASSERT(e == kCGLNoError); OVR_UNUSED(e);
nuclear@0:     if( sid && sid != sid2 ) {
nuclear@0:         e = CGLSetSurface(systemContext, cid, wid, sid);
nuclear@0:         OVR_ASSERT(e == kCGLNoError); OVR_UNUSED(e);
nuclear@0:     }
nuclear@0: }
nuclear@0: #endif
nuclear@0: 
nuclear@0: void Context::Destroy()
nuclear@0: {
nuclear@0:     if( initialized == false )
nuclear@0:     {
nuclear@0:         return;
nuclear@0:     }
nuclear@0:   
nuclear@0:     if (systemContext)
nuclear@0:     {
nuclear@0: #if defined(OVR_OS_MAC)
nuclear@0:         CGLDestroyContext( systemContext );
nuclear@0: #elif defined(OVR_OS_WIN32)
nuclear@0:         BOOL success = wglDeleteContext( systemContext );
nuclear@0:         OVR_ASSERT( success == TRUE );
nuclear@0:         OVR_UNUSED( success );
nuclear@0: #elif defined(OVR_OS_LINUX)
nuclear@0:         glXDestroyContext( x11Display, systemContext );
nuclear@0: #endif
nuclear@0: 
nuclear@0:         systemContext = NULL;
nuclear@0:     }
nuclear@0:   
nuclear@0:     initialized = false;
nuclear@0:     ownsContext = true;
nuclear@0: }
nuclear@0: 
nuclear@0: void Context::Bind()
nuclear@0: {
nuclear@0:     if(systemContext)
nuclear@0:     {
nuclear@0: #if defined(OVR_OS_MAC)
nuclear@0:         glFlush(); //Apple doesn't automatically flush within CGLSetCurrentContext, unlike other platforms.
nuclear@0:         CGLSetCurrentContext( systemContext );
nuclear@0: #elif defined(OVR_OS_WIN32)
nuclear@0:         wglMakeCurrent( hdc, systemContext );
nuclear@0: #elif defined(OVR_OS_LINUX)
nuclear@0:         glXMakeCurrent( x11Display, x11Drawable, systemContext );
nuclear@0: #endif
nuclear@0:     }
nuclear@0: }
nuclear@0: 
nuclear@0: void Context::Unbind()
nuclear@0: {
nuclear@0: #if defined(OVR_OS_MAC)
nuclear@0:     glFlush(); //Apple doesn't automatically flush within CGLSetCurrentContext, unlike other platforms.
nuclear@0:     CGLSetCurrentContext( NULL );
nuclear@0: #elif defined(OVR_OS_WIN32)
nuclear@0:     wglMakeCurrent( hdc, NULL );
nuclear@0: #elif defined(OVR_OS_LINUX)
nuclear@0:     glXMakeCurrent( x11Display, None, NULL );
nuclear@0: #endif
nuclear@0: }
nuclear@0: 
nuclear@0: }}} // namespace OVR::CAPI::GL