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OpenMW is an open implementation of the Morrowind engine
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178#include "depth.hpp"
#include <algorithm>#include <array>
#include <components/debug/debuglog.hpp>#include <components/sceneutil/glextensions.hpp>#include <components/settings/values.hpp>
namespace SceneUtil{ void setCameraClearDepth(osg::Camera* camera) { camera->setClearDepth(AutoDepth::isReversed() ? 0.0 : 1.0); }
osg::Matrix getReversedZProjectionMatrixAsPerspectiveInf(double fov, double aspect, double near) { const double a = 1.0 / std::tan(osg::DegreesToRadians(fov) / 2.0); return osg::Matrix(a / aspect, 0, 0, 0, 0, a, 0, 0, 0, 0, 0, -1, 0, 0, near, 0); }
osg::Matrix getReversedZProjectionMatrixAsPerspective(double fov, double aspect, double near, double far) { const double a = 1.0 / std::tan(osg::DegreesToRadians(fov) / 2.0); return osg::Matrix( a / aspect, 0, 0, 0, 0, a, 0, 0, 0, 0, near / (far - near), -1, 0, 0, (far * near) / (far - near), 0); }
osg::Matrix getReversedZProjectionMatrixAsOrtho( double left, double right, double bottom, double top, double near, double far) { return osg::Matrix(2 / (right - left), 0, 0, 0, 0, 2 / (top - bottom), 0, 0, 0, 0, 1 / (far - near), 0, (right + left) / (left - right), (top + bottom) / (bottom - top), far / (far - near), 1); }
bool isDepthFormat(GLenum format) { constexpr std::array<GLenum, 8> formats = { GL_DEPTH_COMPONENT32F, GL_DEPTH_COMPONENT32F_NV, GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24, GL_DEPTH_COMPONENT32, GL_DEPTH32F_STENCIL8, GL_DEPTH32F_STENCIL8_NV, GL_DEPTH24_STENCIL8, };
return std::find(formats.cbegin(), formats.cend(), format) != formats.cend(); }
bool isDepthStencilFormat(GLenum format) { constexpr std::array<GLenum, 8> formats = { GL_DEPTH32F_STENCIL8, GL_DEPTH32F_STENCIL8_NV, GL_DEPTH24_STENCIL8, };
return std::find(formats.cbegin(), formats.cend(), format) != formats.cend(); }
void getDepthFormatSourceFormatAndType(GLenum internalFormat, GLenum& sourceFormat, GLenum& sourceType) { switch (internalFormat) { case GL_DEPTH_COMPONENT16: case GL_DEPTH_COMPONENT24: case GL_DEPTH_COMPONENT32: sourceType = GL_UNSIGNED_INT; sourceFormat = GL_DEPTH_COMPONENT; break; case GL_DEPTH_COMPONENT32F: case GL_DEPTH_COMPONENT32F_NV: sourceType = GL_FLOAT; sourceFormat = GL_DEPTH_COMPONENT; break; case GL_DEPTH24_STENCIL8: sourceType = GL_UNSIGNED_INT_24_8_EXT; sourceFormat = GL_DEPTH_STENCIL_EXT; break; case GL_DEPTH32F_STENCIL8: case GL_DEPTH32F_STENCIL8_NV: sourceType = GL_FLOAT_32_UNSIGNED_INT_24_8_REV; sourceFormat = GL_DEPTH_STENCIL_EXT; break; default: sourceType = GL_UNSIGNED_INT; sourceFormat = GL_DEPTH_COMPONENT; break; } }
GLenum getDepthFormatOfDepthStencilFormat(GLenum internalFormat) { switch (internalFormat) { case GL_DEPTH24_STENCIL8: return GL_DEPTH_COMPONENT24; break; case GL_DEPTH32F_STENCIL8: return GL_DEPTH_COMPONENT32F; break; case GL_DEPTH32F_STENCIL8_NV: return GL_DEPTH_COMPONENT32F_NV; break; default: return internalFormat; break; } }
void SelectDepthFormatOperation::operator()(osg::GraphicsContext* graphicsContext) { bool enableReverseZ = false;
if (Settings::camera().mReverseZ) { if (SceneUtil::getGLExtensions().isClipControlSupported) { enableReverseZ = true; Log(Debug::Info) << "Using reverse-z depth buffer"; } else Log(Debug::Warning) << "GL_ARB_clip_control not supported: disabling reverse-z depth buffer"; } else Log(Debug::Info) << "Using standard depth buffer";
SceneUtil::AutoDepth::setReversed(enableReverseZ);
constexpr char errPreamble[] = "Postprocessing and floating point depth buffers disabled: "; std::vector<GLenum> requestedFormats; unsigned int contextID = graphicsContext->getState()->getContextID(); if (SceneUtil::AutoDepth::isReversed()) { if (osg::isGLExtensionSupported(contextID, "GL_ARB_depth_buffer_float")) { requestedFormats.push_back(GL_DEPTH32F_STENCIL8); } else if (osg::isGLExtensionSupported(contextID, "GL_NV_depth_buffer_float")) { requestedFormats.push_back(GL_DEPTH32F_STENCIL8_NV); } else { Log(Debug::Warning) << errPreamble << "'GL_ARB_depth_buffer_float' and 'GL_NV_depth_buffer_float' unsupported."; } }
requestedFormats.push_back(GL_DEPTH24_STENCIL8); if (mSupportedFormats.empty()) { SceneUtil::AutoDepth::setDepthFormat(requestedFormats.front()); } else { for (auto requestedFormat : requestedFormats) { if (std::find(mSupportedFormats.cbegin(), mSupportedFormats.cend(), requestedFormat) != mSupportedFormats.cend()) { SceneUtil::AutoDepth::setDepthFormat(requestedFormat); break; } } } }
void AutoDepth::setDepthFormat(GLenum format) { sDepthInternalFormat = format; getDepthFormatSourceFormatAndType(sDepthInternalFormat, sDepthSourceFormat, sDepthSourceType); }}