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Added support for subsititing $VAR_NAME entries in shaders to enable writing shaders that work across GLSL versions.

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This commit is contained in:
Robert Osfield
2017-09-18 18:09:15 +01:00
parent 5ade852172
commit cc7cf54353
5 changed files with 179 additions and 21 deletions
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110
src/osg/DisplaySettings.cpp
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@@ -118,7 +118,8 @@ void DisplaySettings::setDisplaySettings(const DisplaySettings& vs)
_swapMethod = vs._swapMethod;
_vertexBufferHint = vs._vertexBufferHint;
_shaderHint = vs._shaderHint;
setShaderHint(_shaderHint);
_keystoneHint = vs._keystoneHint;
_keystoneFileNames = vs._keystoneFileNames;
@@ -250,23 +251,17 @@ void DisplaySettings::setDefaults()
// _vertexBufferHint = VERTEX_ARRAY_OBJECT;
#if defined(OSG_GLES3_AVAILABLE)
_shaderHint = SHADER_GLES3;
OSG_INFO<<"DisplaySettings::SHADER_GLES3"<<std::endl;
setShaderHint(SHADER_GLES3);
#elif defined(OSG_GLES2_AVAILABLE)
_shaderHint = SHADER_GLES2;
OSG_INFO<<"DisplaySettings::SHADER_GLES2"<<std::endl;
setShaderHint(SHADER_GLES2);
#elif defined(OSG_GL3_AVAILABLE)
_shaderHint = SHADER_GL3;
OSG_INFO<<"DisplaySettings::SHADER_GL3"<<std::endl;
setShaderHint(SHADER_GL3);
#elif defined(OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE)
OSG_INFO<<"DisplaySettings::SHADER_NONE"<<std::endl;
_shaderHint = SHADER_NONE;
setShaderHint(SHADER_NONE);
#else
OSG_INFO<<"DisplaySettings::SHADER_GL2"<<std::endl;
_shaderHint = SHADER_GL2;
setShaderHint(SHADER_GL2);
#endif
_keystoneHint = false;
_OSXMenubarBehavior = MENUBAR_AUTO_HIDE;
@@ -725,23 +720,23 @@ void DisplaySettings::readEnvironmentalVariables()
{
if (strcmp(ptr,"GL2")==0)
{
_shaderHint = SHADER_GL2;
setShaderHint(SHADER_GL2);
}
else if (strcmp(ptr,"GL3")==0)
{
_shaderHint = SHADER_GL3;
setShaderHint(SHADER_GL3);
}
else if (strcmp(ptr,"GLES2")==0)
{
_shaderHint = SHADER_GLES2;
setShaderHint(SHADER_GLES2);
}
else if (strcmp(ptr,"GLES3")==0)
{
_shaderHint = SHADER_GLES3;
setShaderHint(SHADER_GLES3);
}
else if (strcmp(ptr,"NONE")==0)
{
_shaderHint = SHADER_NONE;
setShaderHint(SHADER_NONE);
}
}
@@ -1098,3 +1093,84 @@ osg::Matrixd DisplaySettings::computeRightEyeViewImplementation(const osg::Matri
0.0,0.0,1.0,0.0,
-es,0.0,0.0,1.0);
}
void DisplaySettings::setShaderHint(ShaderHint hint, bool setShaderValues)
{
_shaderHint = hint;
if (setShaderValues)
{
switch(_shaderHint)
{
case(SHADER_GLES3) :
setValue("OSG_GLSL_VERSION", "#version 300 es");
setValue("OSG_PRECISION_FLOAT", "precision highp float;");
setValue("OSG_VARYING_IN", "in");
setValue("OSG_VARYING_OUT", "out");
OSG_NOTICE<<"DisplaySettings::SHADER_GLES3"<<std::endl;
break;
case(SHADER_GLES2) :
setValue("OSG_GLSL_VERSION", "");
setValue("OSG_PRECISION_FLOAT", "precision highp float;");
setValue("OSG_VARYING_IN", "varying");
setValue("OSG_VARYING_OUT", "varying");
OSG_NOTICE<<"DisplaySettings::SHADER_GLES2"<<std::endl;
break;
case(SHADER_GL3) :
setValue("OSG_GLSL_VERSION", "#version 330");
setValue("OSG_PRECISION_FLOAT", "");
setValue("OSG_VARYING_IN", "in");
setValue("OSG_VARYING_OUT", "out");
OSG_NOTICE<<"DisplaySettings::SHADER_GL3"<<std::endl;
break;
case(SHADER_GL2) :
setValue("OSG_GLSL_VERSION", "");
setValue("OSG_PRECISION_FLOAT", "");
setValue("OSG_VARYING_IN", "varying");
setValue("OSG_VARYING_OUT", "varying");
OSG_NOTICE<<"DisplaySettings::SHADER_GL2"<<std::endl;
break;
case(SHADER_NONE) :
setValue("OSG_GLSL_VERSION", "");
setValue("OSG_PRECISION_FLOAT", "");
setValue("OSG_VARYING_IN", "varying");
setValue("OSG_VARYING_OUT", "varying");
OSG_NOTICE<<"DisplaySettings::NONE"<<std::endl;
break;
}
}
}
void DisplaySettings::setValue(const std::string& name, const std::string& value)
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_valueMapMutex);
_valueMap[name] = value;
}
bool DisplaySettings::getValue(const std::string& name, std::string& value, bool use_getenv_fallback) const
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_valueMapMutex);
ValueMap::iterator itr = _valueMap.find(name);
if (itr!=_valueMap.end())
{
value = itr->second;
OSG_NOTICE<<"DisplaySettings::getValue("<<name<<") found existing value = ["<<value<<"]"<<std::endl;
return true;
}
if (!use_getenv_fallback) return false;
const char* str = getenv(name.c_str());
if (str)
{
OSG_NOTICE<<"DisplaySettings::getValue("<<name<<") found getenv value = ["<<value<<"]"<<std::endl;
_valueMap[name] = value = str;
return true;
}
else
{
return false;
}
}