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magnum/src/Magnum/Context.cpp

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/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz>
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
*/
#include "Context.h"
#include <string>
#include <unordered_map>
#include <Corrade/Utility/Debug.h>
#include <Corrade/Utility/String.h>
#include "Magnum/AbstractFramebuffer.h"
#include "Magnum/AbstractShaderProgram.h"
#include "Magnum/AbstractTexture.h"
#include "Magnum/Buffer.h"
#include "Magnum/BufferTexture.h"
#include "Magnum/DefaultFramebuffer.h"
#include "Magnum/Extensions.h"
#include "Magnum/Framebuffer.h"
#include "Magnum/Mesh.h"
#include "Magnum/Renderbuffer.h"
#include "Magnum/Renderer.h"
#include "Implementation/State.h"
namespace Magnum {
const std::vector<Extension>& Extension::extensions(Version version) {
#define _extension(prefix, vendor, extension) \
{Extensions::prefix::vendor::extension::Index, Extensions::prefix::vendor::extension::requiredVersion(), Extensions::prefix::vendor::extension::coreVersion(), Extensions::prefix::vendor::extension::string()}
static const std::vector<Extension> empty;
#ifndef MAGNUM_TARGET_GLES
static const std::vector<Extension> extensions{
_extension(GL,AMD,vertex_shader_layer), // done
_extension(GL,AMD,shader_trinary_minmax), // done
_extension(GL,ARB,robustness), // done
_extension(GL,ATI,texture_mirror_once),
_extension(GL,EXT,texture_filter_anisotropic), // done
_extension(GL,EXT,texture_mirror_clamp),
_extension(GL,EXT,direct_state_access),
_extension(GL,EXT,debug_label),
_extension(GL,EXT,debug_marker),
_extension(GL,GREMEDY,string_marker)}; // done
static const std::vector<Extension> extensions300{
/**
* @todo Remove as it doesn't have all functionality present in GL 3.0
* and leave only ARB_map_buffer_range?
*/
_extension(GL,APPLE,flush_buffer_range), // done
_extension(GL,APPLE,vertex_array_object), // done
_extension(GL,ARB,map_buffer_range), // done, replaces APPLE_flush_buffer_range
_extension(GL,ARB,color_buffer_float),
_extension(GL,ARB,half_float_pixel), // done
_extension(GL,ARB,texture_float), // done
_extension(GL,ARB,depth_buffer_float), // done
_extension(GL,ARB,texture_rg), // done
_extension(GL,ARB,framebuffer_object),
_extension(GL,EXT,gpu_shader4),
_extension(GL,EXT,packed_float), // done
_extension(GL,EXT,texture_array),
_extension(GL,EXT,texture_compression_rgtc), // done
_extension(GL,EXT,texture_shared_exponent), // done
_extension(GL,EXT,framebuffer_sRGB),
_extension(GL,EXT,draw_buffers2),
_extension(GL,EXT,texture_integer),
_extension(GL,EXT,transform_feedback),
_extension(GL,NV,half_float), // done
_extension(GL,NV,depth_buffer_float),
_extension(GL,NV,conditional_render)}; // done
static const std::vector<Extension> extensions310{
_extension(GL,ARB,texture_rectangle),
_extension(GL,ARB,draw_instanced),
_extension(GL,ARB,texture_buffer_object),
_extension(GL,ARB,uniform_buffer_object),
_extension(GL,ARB,copy_buffer), // done
_extension(GL,EXT,texture_snorm), // done
_extension(GL,NV,primitive_restart)};
static const std::vector<Extension> extensions320{
_extension(GL,ARB,geometry_shader4),
_extension(GL,ARB,depth_clamp), // done
_extension(GL,ARB,draw_elements_base_vertex),
_extension(GL,ARB,fragment_coord_conventions), // done
_extension(GL,ARB,provoking_vertex), // done
_extension(GL,ARB,seamless_cube_map), // done
_extension(GL,ARB,sync),
_extension(GL,ARB,texture_multisample),
_extension(GL,ARB,vertex_array_bgra)}; // done
static const std::vector<Extension> extensions330{
_extension(GL,ARB,instanced_arrays),
_extension(GL,ARB,blend_func_extended),
_extension(GL,ARB,explicit_attrib_location), // done
_extension(GL,ARB,occlusion_query2), // done
_extension(GL,ARB,sampler_objects),
_extension(GL,ARB,shader_bit_encoding), // done
_extension(GL,ARB,texture_rgb10_a2ui), // done
_extension(GL,ARB,texture_swizzle),
_extension(GL,ARB,timer_query),
_extension(GL,ARB,vertex_type_2_10_10_10_rev)}; // done
static const std::vector<Extension> extensions400{
_extension(GL,ARB,draw_buffers_blend),
_extension(GL,ARB,sample_shading),
_extension(GL,ARB,texture_cube_map_array), // done
_extension(GL,ARB,texture_gather),
_extension(GL,ARB,texture_query_lod), // done
_extension(GL,ARB,draw_indirect),
_extension(GL,ARB,gpu_shader5),
_extension(GL,ARB,gpu_shader_fp64), // done
_extension(GL,ARB,shader_subroutine),
_extension(GL,ARB,tessellation_shader),
_extension(GL,ARB,texture_buffer_object_rgb32), // done
_extension(GL,ARB,transform_feedback2),
_extension(GL,ARB,transform_feedback3)};
static const std::vector<Extension> extensions410{
_extension(GL,ARB,ES2_compatibility),
_extension(GL,ARB,get_program_binary),
_extension(GL,ARB,separate_shader_objects),
_extension(GL,ARB,shader_precision), // done
_extension(GL,ARB,vertex_attrib_64bit), // done
_extension(GL,ARB,viewport_array)};
static const std::vector<Extension> extensions420{
_extension(GL,ARB,texture_compression_bptc), // done
_extension(GL,ARB,base_instance),
_extension(GL,ARB,shading_language_420pack), // done
_extension(GL,ARB,transform_feedback_instanced),
_extension(GL,ARB,compressed_texture_pixel_storage),
_extension(GL,ARB,conservative_depth), // done
_extension(GL,ARB,internalformat_query),
_extension(GL,ARB,map_buffer_alignment),
_extension(GL,ARB,shader_atomic_counters),
_extension(GL,ARB,shader_image_load_store),
/* Mentioned in GLSL 4.20 specs as newly added */
_extension(GL,ARB,shading_language_packing), // done
_extension(GL,ARB,texture_storage)};
static const std::vector<Extension> extensions430{
_extension(GL,ARB,arrays_of_arrays), // done
_extension(GL,ARB,ES3_compatibility),
_extension(GL,ARB,clear_buffer_object),
_extension(GL,ARB,compute_shader),
_extension(GL,ARB,copy_image),
_extension(GL,KHR,debug),
_extension(GL,ARB,explicit_uniform_location),
_extension(GL,ARB,fragment_layer_viewport), // done
_extension(GL,ARB,framebuffer_no_attachments),
_extension(GL,ARB,internalformat_query2),
_extension(GL,ARB,invalidate_subdata), // done
_extension(GL,ARB,multi_draw_indirect),
_extension(GL,ARB,program_interface_query),
_extension(GL,ARB,robust_buffer_access_behavior), // done
_extension(GL,ARB,shader_image_size), // done
_extension(GL,ARB,shader_storage_buffer_object),
_extension(GL,ARB,stencil_texturing),
_extension(GL,ARB,texture_buffer_range), // done
_extension(GL,ARB,texture_query_levels), // done
_extension(GL,ARB,texture_storage_multisample),
_extension(GL,ARB,texture_view),
_extension(GL,ARB,vertex_attrib_binding)};
static const std::vector<Extension> extensions440{
_extension(GL,ARB,buffer_storage),
_extension(GL,ARB,clear_texture),
_extension(GL,ARB,enhanced_layouts),
_extension(GL,ARB,multi_bind),
_extension(GL,ARB,query_buffer_object),
_extension(GL,ARB,texture_mirror_clamp_to_edge),
_extension(GL,ARB,texture_stencil8),
_extension(GL,ARB,vertex_type_10f_11f_11f_rev)};
#undef _extension
#else
static const std::vector<Extension> extensions{
_extension(GL,APPLE,texture_format_BGRA8888),
_extension(GL,CHROMIUM,map_sub),
_extension(GL,EXT,texture_filter_anisotropic),
_extension(GL,EXT,texture_format_BGRA8888),
_extension(GL,EXT,read_format_bgra),
_extension(GL,EXT,debug_label),
_extension(GL,EXT,debug_marker),
_extension(GL,EXT,disjoint_timer_query),
_extension(GL,EXT,separate_shader_objects),
_extension(GL,EXT,sRGB),
/**
* @todo Support also IMG_multisampled_render_to_texture? It has
* different enum values (!)
*/
_extension(GL,EXT,multisampled_render_to_texture),
_extension(GL,EXT,robustness),
_extension(GL,KHR,debug),
_extension(GL,NV,read_buffer_front),
_extension(GL,NV,read_depth),
_extension(GL,NV,read_stencil),
_extension(GL,NV,read_depth_stencil),
_extension(GL,NV,texture_border_clamp), // done
_extension(GL,OES,depth32),
_extension(GL,OES,mapbuffer),
_extension(GL,OES,stencil1),
_extension(GL,OES,stencil4),
_extension(GL,OES,texture_3D)};
#ifdef MAGNUM_TARGET_GLES2
static const std::vector<Extension> extensionsES300{
_extension(GL,ANGLE,framebuffer_blit),
_extension(GL,ANGLE,framebuffer_multisample),
_extension(GL,ANGLE,depth_texture), // done
_extension(GL,APPLE,framebuffer_multisample),
_extension(GL,ARM,rgba8),
_extension(GL,EXT,texture_type_2_10_10_10_REV),
_extension(GL,EXT,discard_framebuffer),
_extension(GL,EXT,blend_minmax),
_extension(GL,EXT,occlusion_query_boolean),
_extension(GL,EXT,texture_rg),
_extension(GL,EXT,texture_storage),
_extension(GL,EXT,map_buffer_range),
_extension(GL,NV,draw_buffers),
_extension(GL,NV,fbo_color_attachments),
_extension(GL,NV,read_buffer),
_extension(GL,NV,framebuffer_blit), // done
_extension(GL,NV,framebuffer_multisample),
_extension(GL,OES,depth24),
_extension(GL,OES,element_index_uint),
_extension(GL,OES,rgb8_rgba8),
_extension(GL,OES,texture_half_float_linear),
_extension(GL,OES,texture_float_linear),
_extension(GL,OES,texture_half_float),
_extension(GL,OES,texture_float),
_extension(GL,OES,vertex_half_float),
_extension(GL,OES,packed_depth_stencil),
_extension(GL,OES,depth_texture),
_extension(GL,OES,standard_derivatives), // done
_extension(GL,OES,vertex_array_object),
_extension(GL,OES,required_internalformat),
_extension(GL,OES,surfaceless_context)}; // done
#endif
#endif
switch(version) {
case Version::None: return extensions;
#ifndef MAGNUM_TARGET_GLES
case Version::GL210: return empty;
case Version::GL300: return extensions300;
case Version::GL310: return extensions310;
case Version::GL320: return extensions320;
case Version::GL330: return extensions330;
case Version::GL400: return extensions400;
/* case Version::GLES200: */
case Version::GL410: return extensions410;
case Version::GL420: return extensions420;
/* case Version::GLES300: */
case Version::GL430: return extensions430;
case Version::GL440: return extensions440;
#else
case Version::GLES200: return empty;
case Version::GLES300:
#ifdef MAGNUM_TARGET_GLES2
return extensionsES300;
#else
return empty;
#endif
#endif
}
CORRADE_ASSERT_UNREACHABLE();
}
Context* Context::_current = nullptr;
Context::Context() {
#ifndef MAGNUM_TARGET_GLES
/* Init glLoadGen. Ignore functions that failed to load (described by
`ogl_LOAD_SUCCEEDED + n` return code), as we requested the latest OpenGL
with many vendor extensions and there won't ever be a driver supporting
everything possible. */
if(ogl_LoadFunctions() == ogl_LOAD_FAILED) {
Error() << "ExtensionWrangler: cannot initialize glLoadGen";
std::exit(1);
}
#endif
/* Version */
#ifndef MAGNUM_TARGET_GLES2
glGetIntegerv(GL_MAJOR_VERSION, &_majorVersion);
glGetIntegerv(GL_MINOR_VERSION, &_minorVersion);
#else
_majorVersion = 2;
_minorVersion = 0;
#endif
_version = static_cast<Version>(_majorVersion*100+_minorVersion*10);
CORRADE_ASSERT(Renderer::error() == Renderer::Error::NoError,
"Context: cannot retrieve OpenGL version", );
#ifndef MAGNUM_TARGET_GLES
CORRADE_ASSERT(isVersionSupported(Version::GL210), "Context: unsupported OpenGL version" << Int(_version), );
#elif defined(MAGNUM_TARGET_GLES2)
CORRADE_ASSERT(isVersionSupported(Version::GLES200), "Context: unsupported OpenGL ES version" << Int(_version), );
#else
CORRADE_ASSERT(isVersionSupported(Version::GLES300), "Context: unsupported OpenGL ES version" << Int(_version), );
#endif
/* Context flags are supported since GL 3.0 */
#ifndef MAGNUM_TARGET_GLES
/**
* @todo According to KHR_debug specs this should be also present in ES2
* if KHR_debug is available, but in headers it is nowhere to be found
*/
if(isVersionSupported(Version::GL300))
glGetIntegerv(GL_CONTEXT_FLAGS, reinterpret_cast<GLint*>(&_flags));
#endif
/* Get first future (not supported) version */
std::vector<Version> versions{
#ifndef MAGNUM_TARGET_GLES
Version::GL300,
Version::GL310,
Version::GL320,
Version::GL330,
Version::GL400,
Version::GL410,
Version::GL420,
Version::GL430,
Version::GL440,
#else
Version::GLES200,
Version::GLES300,
#endif
Version::None
};
std::size_t future = 0;
while(versions[future] != Version::None && isVersionSupported(versions[future]))
++future;
/* List of extensions from future versions (extensions from current and
previous versions should be supported automatically, so we don't need
to check for them) */
std::unordered_map<std::string, Extension> futureExtensions;
for(std::size_t i = future; i != versions.size(); ++i)
for(const Extension& extension: Extension::extensions(versions[i]))
#ifndef CORRADE_GCC46_COMPATIBILITY
futureExtensions.emplace(extension._string, extension);
#else
futureExtensions.insert({extension._string, extension});
#endif
/* Check for presence of extensions in future versions */
#ifndef MAGNUM_TARGET_GLES2
GLint extensionCount = 0;
glGetIntegerv(GL_NUM_EXTENSIONS, &extensionCount);
#ifndef MAGNUM_TARGET_GLES3
if(extensionCount || isVersionSupported(Version::GL300))
#endif
{
_supportedExtensions.reserve(extensionCount);
for(GLint i = 0; i != extensionCount; ++i) {
const std::string extension(reinterpret_cast<const char*>(glGetStringi(GL_EXTENSIONS, i)));
auto found = futureExtensions.find(extension);
if(found != futureExtensions.end()) {
_supportedExtensions.push_back(found->second);
extensionStatus.set(found->second._index);
}
}
}
#ifndef MAGNUM_TARGET_GLES3
else
#endif
#endif
#ifndef MAGNUM_TARGET_GLES3
/* OpenGL 2.1 / OpenGL ES 2.0 doesn't have glGetStringi() */
{
/* Don't crash when glGetString() returns nullptr */
const char* e = reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
if(e) {
std::vector<std::string> extensions = Utility::String::split(e, ' ');
for(const std::string& extension: extensions) {
auto found = futureExtensions.find(extension);
if(found != futureExtensions.end()) {
_supportedExtensions.push_back(found->second);
extensionStatus.set(found->second._index);
}
}
}
}
#endif
/* Disable extensions for which we need extension loader, as they would
crash otherwise. */
/** @todo Remove this when extension loader for ES is available */
#ifdef MAGNUM_TARGET_GLES
#define _disable(prefix, vendor, extension) \
extensionStatus.reset(Extensions::prefix::vendor::extension::Index);
#ifndef CORRADE_TARGET_NACL
_disable(GL,CHROMIUM,map_sub)
#endif
_disable(GL,EXT,debug_label)
_disable(GL,EXT,debug_marker)
_disable(GL,EXT,disjoint_timer_query)
_disable(GL,EXT,separate_shader_objects)
_disable(GL,EXT,multisampled_render_to_texture)
_disable(GL,EXT,robustness)
_disable(GL,KHR,debug)
_disable(GL,NV,read_buffer_front)
_disable(GL,OES,mapbuffer)
_disable(GL,OES,texture_3D)
#ifdef MAGNUM_TARGET_GLES2
_disable(GL,ANGLE,framebuffer_blit)
_disable(GL,ANGLE,framebuffer_multisample)
_disable(GL,APPLE,framebuffer_multisample)
_disable(GL,EXT,discard_framebuffer)
_disable(GL,EXT,blend_minmax)
#ifndef CORRADE_TARGET_NACL
_disable(GL,EXT,occlusion_query_boolean)
#endif
_disable(GL,EXT,texture_storage)
_disable(GL,EXT,map_buffer_range)
_disable(GL,NV,draw_buffers)
_disable(GL,NV,fbo_color_attachments) // ??
_disable(GL,NV,read_buffer)
_disable(GL,NV,framebuffer_multisample)
_disable(GL,OES,vertex_array_object)
#endif
#undef _disable
#endif
/* Set this context as current */
CORRADE_ASSERT(!_current, "Context: Another context currently active", );
_current = this;
/* Initialize state tracker */
_state = new Implementation::State(*this);
/* Initialize functionality based on current OpenGL version and extensions */
AbstractFramebuffer::initializeContextBasedFunctionality(*this);
AbstractShaderProgram::initializeContextBasedFunctionality(*this);
AbstractTexture::initializeContextBasedFunctionality(*this);
Buffer::initializeContextBasedFunctionality(*this);
#ifndef MAGNUM_TARGET_GLES
BufferTexture::initializeContextBasedFunctionality(*this);
#endif
DefaultFramebuffer::initializeContextBasedFunctionality(*this);
Framebuffer::initializeContextBasedFunctionality(*this);
Mesh::initializeContextBasedFunctionality(*this);
Renderbuffer::initializeContextBasedFunctionality(*this);
Renderer::initializeContextBasedFunctionality(*this);
}
Context::~Context() {
CORRADE_ASSERT(_current == this, "Context: Cannot destroy context which is not currently active", );
delete _state;
_current = nullptr;
}
std::vector<std::string> Context::shadingLanguageVersionStrings() const {
#ifndef MAGNUM_TARGET_GLES
GLint versionCount = 0;
glGetIntegerv(GL_NUM_SHADING_LANGUAGE_VERSIONS, &versionCount);
/* The implementation doesn't yet support this query (< OpenGL 4.3) */
if(!versionCount)
return {shadingLanguageVersionString()};
/* Get all of them */
std::vector<std::string> versions;
versions.reserve(versionCount);
for(GLint i = 0; i != versionCount; ++i)
versions.push_back(reinterpret_cast<const char*>(glGetStringi(GL_SHADING_LANGUAGE_VERSION, i)));
return std::move(versions);
#else
return {shadingLanguageVersionString()};
#endif
}
Version Context::supportedVersion(std::initializer_list<Version> versions) const {
for(auto version: versions)
if(isVersionSupported(version)) return version;
#ifndef MAGNUM_TARGET_GLES
return Version::GL210;
#else
return Version::GLES200;
#endif
}
}