dolphin/Source/Core/VideoBackends/OGL/main.cpp

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// Copyright 2008 Dolphin Emulator Project
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// Licensed under GPLv2+
// Refer to the license.txt file included.
// OpenGL Backend Documentation
/*
1.1 Display settings
Internal and fullscreen resolution: Since the only internal resolutions allowed
are also fullscreen resolution allowed by the system there is only need for one
resolution setting that applies to both the internal resolution and the
fullscreen resolution. - Apparently no, someone else doesn't agree
Todo: Make the internal resolution option apply instantly, currently only the
native and 2x option applies instantly. To do this we need to be able to change
the reinitialize FramebufferManager:Init() while a game is running.
1.2 Screenshots
The screenshots should be taken from the internal representation of the picture
regardless of what the current window size is. Since AA and wireframe is
applied together with the picture resizing this rule is not currently applied
to AA or wireframe pictures, they are instead taken from whatever the window
size is.
Todo: Render AA and wireframe to a separate picture used for the screenshot in
addition to the one for display.
1.3 AA
Make AA apply instantly during gameplay if possible
*/
#include <memory>
#include <string>
#include <vector>
#include "Common/Common.h"
#include "Common/GL/GLContext.h"
#include "Common/GL/GLUtil.h"
#include "Common/MsgHandler.h"
#include "VideoBackends/OGL/BoundingBox.h"
#include "VideoBackends/OGL/PerfQuery.h"
#include "VideoBackends/OGL/ProgramShaderCache.h"
#include "VideoBackends/OGL/Render.h"
#include "VideoBackends/OGL/SamplerCache.h"
#include "VideoBackends/OGL/TextureCache.h"
#include "VideoBackends/OGL/TextureConverter.h"
#include "VideoBackends/OGL/VertexManager.h"
#include "VideoBackends/OGL/VideoBackend.h"
#include "VideoCommon/OnScreenDisplay.h"
#include "VideoCommon/VideoCommon.h"
#include "VideoCommon/VideoConfig.h"
namespace OGL
{
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std::string VideoBackend::GetName() const
{
return "OGL";
}
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std::string VideoBackend::GetDisplayName() const
{
if (g_renderer && static_cast<Renderer*>(g_renderer.get())->IsGLES())
return _trans("OpenGL ES");
else
return _trans("OpenGL");
}
void VideoBackend::InitBackendInfo()
{
g_Config.backend_info.api_type = APIType::OpenGL;
g_Config.backend_info.MaxTextureSize = 16384;
g_Config.backend_info.bSupportsExclusiveFullscreen = false;
g_Config.backend_info.bSupportsOversizedViewports = true;
g_Config.backend_info.bSupportsGeometryShaders = true;
g_Config.backend_info.bSupportsComputeShaders = false;
g_Config.backend_info.bSupports3DVision = false;
g_Config.backend_info.bSupportsPostProcessing = true;
g_Config.backend_info.bSupportsSSAA = true;
g_Config.backend_info.bSupportsReversedDepthRange = true;
g_Config.backend_info.bSupportsLogicOp = true;
g_Config.backend_info.bSupportsMultithreading = false;
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g_Config.backend_info.bSupportsCopyToVram = true;
// TODO: There is a bug here, if texel buffers are not supported the graphics options
// will show the option when it is not supported. The only way around this would be
// creating a context when calling this function to determine what is available.
g_Config.backend_info.bSupportsGPUTextureDecoding = true;
// Overwritten in Render.cpp later
g_Config.backend_info.bSupportsDualSourceBlend = true;
g_Config.backend_info.bSupportsPrimitiveRestart = true;
g_Config.backend_info.bSupportsPaletteConversion = true;
g_Config.backend_info.bSupportsClipControl = true;
g_Config.backend_info.bSupportsDepthClamp = true;
g_Config.backend_info.bSupportsST3CTextures = false;
g_Config.backend_info.bSupportsBPTCTextures = false;
g_Config.backend_info.Adapters.clear();
// aamodes - 1 is to stay consistent with D3D (means no AA)
g_Config.backend_info.AAModes = {1, 2, 4, 8};
}
bool VideoBackend::InitializeGLExtensions(GLContext* context)
{
// Init extension support.
if (!GLExtensions::Init(context))
{
// OpenGL 2.0 is required for all shader based drawings. There is no way to get this by
// extensions
PanicAlert("GPU: OGL ERROR: Does your video card support OpenGL 2.0?");
return false;
}
if (GLExtensions::Version() < 300)
{
// integer vertex attributes require a gl3 only function
PanicAlert("GPU: OGL ERROR: Need OpenGL version 3.\n"
"GPU: Does your video card support OpenGL 3?");
return false;
}
return true;
}
bool VideoBackend::FillBackendInfo()
{
// check for the max vertex attributes
GLint numvertexattribs = 0;
glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &numvertexattribs);
if (numvertexattribs < 16)
{
PanicAlert("GPU: OGL ERROR: Number of attributes %d not enough.\n"
"GPU: Does your video card support OpenGL 2.x?",
numvertexattribs);
return false;
}
// check the max texture width and height
GLint max_texture_size = 0;
glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size);
g_Config.backend_info.MaxTextureSize = static_cast<u32>(max_texture_size);
if (max_texture_size < 1024)
{
PanicAlert("GL_MAX_TEXTURE_SIZE too small at %i - must be at least 1024.", max_texture_size);
return false;
}
// TODO: Move the remaining fields from the Renderer constructor here.
return true;
}
bool VideoBackend::Initialize(const WindowSystemInfo& wsi)
{
InitializeShared();
std::unique_ptr<GLContext> main_gl_context =
GLContext::Create(wsi, g_ActiveConfig.stereo_mode == StereoMode::QuadBuffer);
if (!main_gl_context)
return false;
if (!InitializeGLExtensions(main_gl_context.get()) || !FillBackendInfo())
return false;
g_renderer = std::make_unique<Renderer>(std::move(main_gl_context));
g_vertex_manager = std::make_unique<VertexManager>();
g_perf_query = GetPerfQuery();
ProgramShaderCache::Init();
g_texture_cache = std::make_unique<TextureCache>();
g_sampler_cache = std::make_unique<SamplerCache>();
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g_shader_cache = std::make_unique<VideoCommon::ShaderCache>();
static_cast<Renderer*>(g_renderer.get())->Init();
TextureConverter::Init();
OGL: implement Bounding Box on systems w/o SSBO This commit should have zero performance effect if SSBOs are supported. If they aren't (e.g. on all Macs), this commit alters FramebufferManager to attach a new stencil buffer and VertexManager to draw to it when bounding box is active. `BBoxRead` gets the pixel data from the buffer and dumbly loops through it to find the bounding box. This patch can run Paper Mario: The Thousand-Year Door at almost full speed (50–60 FPS) without Dual-Core enabled for all common bounding box-using actions I tested (going through pipes, Plane Mode, Paper Mode, Prof. Frankly's gate, combat, walking around the overworld, etc.) on my computer (macOS 10.12.3, 2.8 GHz Intel Core i7, 16 GB 1600 MHz DDR3, and Intel Iris 1536 MB). A few more demanding scenes (e.g. the self-building bridge on the way to Petalburg) slow to ~15% of their speed without this patch (though they don't run quite at full speed even on master). The slowdown is caused almost solely by `glReadPixels` in `OGL::BoundingBox::Get`. Other implementation ideas: - Use a stencil buffer that's separate from the depth buffer. This would require ARB_texture_stencil8 / OpenGL 4.4, which isn't available on macOS. - Use `glGetTexImage` instead of `glReadPixels`. This is ~5 FPS slower on my computer, presumably because it has to transfer the entire combined depth-stencil buffer instead of only the stencil data. Getting only stencil data from `glGetTexImage` requires ARB_texture_stencil8 / OpenGL 4.4, which (again) is not available on macOS. - Don't use a PBO, and use `glReadPixels` synchronously. This has no visible performance effect on my computer, and is theoretically slower.
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BoundingBox::Init(g_renderer->GetTargetWidth(), g_renderer->GetTargetHeight());
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return g_shader_cache->Initialize();
}
void VideoBackend::Shutdown()
{
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g_shader_cache->Shutdown();
g_renderer->Shutdown();
BoundingBox::Shutdown();
TextureConverter::Shutdown();
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g_shader_cache.reset();
g_sampler_cache.reset();
g_texture_cache.reset();
ProgramShaderCache::Shutdown();
g_perf_query.reset();
g_vertex_manager.reset();
g_renderer.reset();
ShutdownShared();
}
} // namespace OGL