diff options
| -rw-r--r-- | shaders/earth_fallback.fp | 36 | ||||
| -rw-r--r-- | sons_of_sol/private_db/ApplicationInit.cpp | 13 |
2 files changed, 48 insertions, 1 deletions
diff --git a/shaders/earth_fallback.fp b/shaders/earth_fallback.fp new file mode 100644 index 0000000..c8d6d2a --- /dev/null +++ b/shaders/earth_fallback.fp @@ -0,0 +1,36 @@ +// Set the fragment color + +uniform sampler2D tex; + +varying vec3 fragmentNormal ; +varying vec3 lightVector ; +varying vec3 cameraVector ; + +void main() +{ + vec3 fragNormal = normalize( fragmentNormal ) ; + + float f = dot( fragNormal, normalize( lightVector ) ); + float c = dot( fragNormal, normalize( cameraVector ) ); + c = (c - 0.5) * 2.0 ; + + vec4 color = texture2D(tex,gl_TexCoord[0].xy + vec2( 0.5, -0.2 )); + + float bluef = (1.0f / (1.0f + exp(-f * 150.0f))); + + float bluef2 = (1.0f / (1.0f + exp(c * 20.0f))) * f; + float redf2 = (1.0f / (1.0f + exp(c * 20.0f))) * pow(f,2) * f; + float greenf2 = redf2; + + float alpha = (1.0f / (1.0f + exp(c * 30.0f))) * f; + + /* Each color has its own drop off rate */ + float greenf = (1.0f / (1.0f + exp(-f * 60.0f))); + float redf = (1.0f / (1.0f + exp(-f * 30.0f))); + + gl_FragColor = vec4( + redf*color[0] + 1000.0*redf2, + greenf*color[1] + 1000.0*greenf2, + bluef*color[2] + 1000.0*bluef2, + 1.0-1000.0*alpha ); +} diff --git a/sons_of_sol/private_db/ApplicationInit.cpp b/sons_of_sol/private_db/ApplicationInit.cpp index 1794fd5..ea409ed 100644 --- a/sons_of_sol/private_db/ApplicationInit.cpp +++ b/sons_of_sol/private_db/ApplicationInit.cpp @@ -180,8 +180,19 @@ bool SonsOfSolApplication::initialize( int argc, char** argv ) { } m_earth_prog = new GloxProgram() ; + + + printf( "Using GLSL version %s\n", glGetString( GL_SHADING_LANGUAGE_VERSION ) ); + + const char* earth_frag_shader = "shaders/earth.fp"; + float version = atof( (const char*) glGetString( GL_SHADING_LANGUAGE_VERSION ) ); + if( version < 1.29 ) { + fprintf( stderr, "Using version %02f, unfortunately, I must use the fallback shader\n", version ); + earth_frag_shader = "shaders/earth_fallback.fp"; + } + if( m_earth_prog->attachShaderFromFile( "shaders/earth.vp", GL_VERTEX_SHADER ) || - m_earth_prog->attachShaderFromFile( "shaders/earth.fp", GL_FRAGMENT_SHADER ) || + m_earth_prog->attachShaderFromFile( earth_frag_shader, GL_FRAGMENT_SHADER ) || m_earth_prog->link() ) { cerr << "Warning Unable to load shaders: " << GloxShader::getMessage() << endl; |