Hi Yun-Ta, ShaderGen assumes OpenGL 2 feature set, so items like the built in gl_* uniforms and vertex attributes are used. osg::State does map automatically a number of these uniforms for GLE2 but doing a search and replace of them, this isn't exhaustive though.
The work I'm just starting now on shader composition will make ShaderGen completely redundant and will properly support GLES 2, GL3 and GL4, so the issues you are seeing should disappear completely. Robert. On Wed, Jun 30, 2010 at 6:08 PM, <[email protected]> wrote: > Hi all, > > I am trying to test OSG (2.9.8) on N900 with OpenGL ES2. > However, ShaderGen.cpp seems to be not fully compatible with OpenGL ES2 > standard. > > For instance, gl_LightSource is not defined in ES2 and precision > attribute (mediump / highp / lowp) has been missing. The later one can > be easily fixed while the first one using undefined variables is more > difficult to work around. > > Here is the GLSL code generated from ShaderGen.cpp: > Nokia-N900:/home/user/osg-data# /opt/osg/bin/osgviewer cessna.osg > GraphicsWindowX11::init() - eglInitialize() succeded eglMajorVersion=1 > iMinorVersion=4 > GraphicsWindowX11::init() - window created =1 > State::convertShaderSourceToOsgBuiltIns() > ++Before Converted source > varying vec3 normalDir; > varying vec3 lightDir; > varying vec3 viewDir; > > void main() > { > gl_Position = ftransform(); > normalDir = gl_NormalMatrix * gl_Normal; > vec3 dir = -vec3(gl_ModelViewMatrix * gl_Vertex); > viewDir = dir; > vec4 lpos = gl_LightSource[0].position; > if (lpos.w == 0.0) > lightDir = lpos.xyz; > else > lightDir = lpos.xyz + dir; > } > > ++++++++ > -------- Converted source > uniform mat3 osg_NormalMatrix; > uniform mat4 osg_ModelViewProjectionMatrix; > uniform mat4 osg_ModelViewMatrix; > attribute vec4 osg_Vertex; > attribute vec3 osg_Normal; > varying vec3 normalDir; > varying vec3 lightDir; > varying vec3 viewDir; > > void main() > { > gl_Position = osg_ModelViewProjectionMatrix * osg_Vertex; > normalDir = osg_NormalMatrix * osg_Normal; > vec3 dir = -vec3(osg_ModelViewMatrix * osg_Vertex); > viewDir = dir; > vec4 lpos = gl_LightSource[0].position; > if (lpos.w == 0.0) > lightDir = lpos.xyz; > else > lightDir = lpos.xyz + dir; > } > > ---------------- > VERTEX glCompileShader "" FAILED > VERTEX Shader "" infolog: > Compile failed. > ERROR: 0:16: 'gl_LightSource' : undeclared identifer > ERROR: 0:16: 'gl_LightSource' : left of '[' is not of type array, > matrix, or vector > ERROR: 0:16: 'position' : illegal vector field selection > ERROR: 0:16: 'assign' : cannot convert from 'float' to '4-component > vector of float' > ERROR: 4 compilation errors. No code generated. > > > FRAGMENT glCompileShader "" FAILED > FRAGMENT Shader "" infolog: > Compile failed. > ERROR: 0:1: 'vec3' : No precision defined for this type > ERROR: 0:2: 'vec3' : No precision defined for this type > ERROR: 0:3: 'vec3' : No precision defined for this type > ERROR: 0:7: 'vec4' : No precision defined for this type > ERROR: 0:8: 'vec3' : No precision defined for this type > ERROR: 0:9: 'vec3' : No precision defined for this type > ERROR: 0:10: 'vec3' : No precision defined for this type > ERROR: 0:11: 'vec4' : No precision defined for this type > ERROR: 0:11: 'gl_FrontLightModelProduct' : undeclared identifer > .... > > Any suggestion? > > Thanks. > Best Regards, > Yun-Ta > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
