FGFS-4.1/OpenSceneGraph
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Backported GLES compatible shaders into ShaderGen

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This commit is contained in:
Robert Osfield
2017-05-16 15:40:10 +01:00
parent e6ab01c7c6
commit 1e4f6f675b
1 changed files with 27 additions and 15 deletions
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42
src/osgUtil/ShaderGen.cpp
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@@ -116,27 +116,37 @@ osg::StateSet *ShaderGenCache::createStateSet(int stateMask) const
osg::Program *program = new osg::Program;
stateSet->setAttribute(program);
std::ostringstream vert;
std::ostringstream frag;
std::ostringstream vert_frag;
vert_frag << "// ShaderGen shader\n";
vert_frag << "#ifdef GL_ES\n"
" precision highp float;\n"
"#endif\n";
// write varyings
if ((stateMask & LIGHTING) && !(stateMask & NORMAL_MAP))
{
vert << "varying vec3 normalDir;\n";
vert_frag << "varying vec3 normalDir;\n";
}
if (stateMask & (LIGHTING | NORMAL_MAP))
{
vert << "varying vec3 lightDir;\n";
vert_frag << "varying vec3 lightDir;\n";
}
if (stateMask & (LIGHTING | NORMAL_MAP | FOG))
{
vert << "varying vec3 viewDir;\n";
vert_frag << "varying vec3 viewDir;\n";
}
// copy varying to fragment shader
frag << vert.str();
vert_frag << "varying vec4 vertexColor;\n";
std::ostringstream vert;
std::ostringstream frag;
// copy varying to vertex ad fragment shader
vert << vert_frag.str();
frag << vert_frag.str();
// write uniforms and attributes
int unit = 0;
@@ -185,6 +195,7 @@ osg::StateSet *ShaderGenCache::createStateSet(int stateMask) const
" lightDir.y = dot(dir, b);\n"\
" lightDir.z = dot(dir, n);\n";
}
#if !OSG_GLES2_FEATURES && !OSG_GLES3_FEATURES && !OSG_GL2_FEATURES
else if (stateMask & LIGHTING)
{
vert <<
@@ -201,11 +212,12 @@ osg::StateSet *ShaderGenCache::createStateSet(int stateMask) const
{
vert <<
" viewDir = -vec3(gl_ModelViewMatrix * gl_Vertex);\n"\
" gl_FrontColor = gl_Color;\n";
" vertexColor = gl_Color;\n";
}
#endif
else
{
vert << " gl_FrontColor = gl_Color;\n";
vert << " vertexColor = gl_Color;\n";
}
vert << "}\n";
@@ -216,11 +228,11 @@ osg::StateSet *ShaderGenCache::createStateSet(int stateMask) const
if (stateMask & DIFFUSE_MAP)
{
frag << " vec4 base = texture2D(diffuseMap, gl_TexCoord[0].st);\n";
frag << " vec4 base = vertexColor * texture2D(diffuseMap, gl_TexCoord[0].st);\n";
}
else
{
frag << " vec4 base = vec4(1.0);\n";
frag << " vec4 base = vertexColor;\n";
}
if (stateMask & NORMAL_MAP)
@@ -228,6 +240,7 @@ osg::StateSet *ShaderGenCache::createStateSet(int stateMask) const
frag << " vec3 normalDir = texture2D(normalMap, gl_TexCoord[0].st).xyz*2.0-1.0;\n";
}
#if !OSG_GLES2_FEATURES && !OSG_GLES3_FEATURES && !OSG_GL2_FEATURES
if (stateMask & (LIGHTING | NORMAL_MAP))
{
frag <<
@@ -247,15 +260,13 @@ osg::StateSet *ShaderGenCache::createStateSet(int stateMask) const
" }\n";
}
else
#endif
{
frag << " vec4 color = base;\n";
}
if (!(stateMask & LIGHTING))
{
frag << " color *= gl_Color;\n";
}
#if !OSG_GLES2_FEATURES && !OSG_GLES3_FEATURES && !OSG_GL2_FEATURES
if (stateMask & FOG)
{
frag <<
@@ -263,6 +274,7 @@ osg::StateSet *ShaderGenCache::createStateSet(int stateMask) const
" float f = exp2(-1.442695*gl_Fog.density*gl_Fog.density*d2);\n"\
" color.rgb = mix(gl_Fog.color.rgb, color.rgb, clamp(f, 0.0, 1.0));\n";
}
#endif
frag << " gl_FragColor = color;\n";
frag << "}\n";