98 lines
2.6 KiB
C++
98 lines
2.6 KiB
C++
#include "externals.hh"
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#include "utilities.hh"
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#include "texture.hh"
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#include "rendertarget.hh"
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#include "raymarcher.hh"
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#include "profiling.hh"
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namespace {
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static const std::string Name_( "Raymarcher" );
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}
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#define PSTART() T_Profiler::Profiler.start( Name_ )
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#define PEND() do { glFinish( ); T_Profiler::Profiler.end( Name_ ); } while ( 0 )
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T_Raymarcher::T_Raymarcher(
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__rw__ T_FilesWatcher& watcher ,
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__rd__ const uint32_t width ,
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__rd__ const uint32_t height )
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: camera_( ) , program_( GL_FRAGMENT_SHADER , watcher ) ,
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txOutput_( width , height , E_TexType::RGB16F ) ,
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txDepth_( width , height , E_TexType::R16F ) ,
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rtOutput_( T_RendertargetSetup( )
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.add( txOutput_ )
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.add( txDepth_ )
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.create( ) )
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{
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glGenProgramPipelines( 1 , &pipeline_ );
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program_.addFile( "raymarch-header.glsl" );
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program_.addFile( "map.glsl" );
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program_.addFile( "raymarcher.glsl" );
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program_.load( );
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auto& fsq( T_ShaderProgram::FullscreenQuad( watcher ) );
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glUseProgramStages( pipeline_ , GL_VERTEX_SHADER_BIT , fsq.id( ) );
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glUseProgramStages( pipeline_ , GL_FRAGMENT_SHADER_BIT , program_.id( ) );
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assert( glGetError( ) == GL_NO_ERROR );
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}
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void T_Raymarcher::render( )
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{
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PSTART( );
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if ( ! rtOutput_.activate( ) ) {
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PEND( );
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return;
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}
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glBindProgramPipeline( pipeline_ );
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glClearColor( 0 , 0 , 0 , 1 );
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glClear( GL_COLOR_BUFFER_BIT );
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enum {
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U_TIME = 0 ,
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U_RESOLUTION = 1 ,
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U_CAM_POS = 2 ,
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U_LOOK_AT = 3 ,
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U_CAM_UP = 4 ,
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U_NEAR_PLANE = 5 ,
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U_LIGHT_DIR = 6 ,
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U_RAYMARCHER = 7 ,
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};
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glProgramUniform1f( program_.id( ) , U_TIME , 0 );
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glProgramUniform2f( program_.id( ) , U_RESOLUTION , rtOutput_.width( ) , rtOutput_.height( ) );
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glProgramUniform3fv( program_.id( ) , U_CAM_POS , 1 , &camera_.pos.x );
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glProgramUniform3fv( program_.id( ) , U_LOOK_AT , 1 , &camera_.lookAt.x );
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glProgramUniform3fv( program_.id( ) , U_CAM_UP , 1 , &camera_.up.x );
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glProgramUniform1f( program_.id( ) , U_NEAR_PLANE , camera_.np );
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glProgramUniform3f( program_.id( ) , U_LIGHT_DIR , 0 , 1 , 1 );
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glProgramUniform4f( program_.id( ) , U_RAYMARCHER , rmIterations , rmStep ,
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rmEpsilon , rmMaxDist );
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glDrawArrays( GL_TRIANGLE_STRIP , 0 , 4 );
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glBindProgramPipeline( 0 );
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PEND( );
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}
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void T_Raymarcher::makeUI( )
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{
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camera_.makeUI( );
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if ( !ImGui::CollapsingHeader( "Raymarcher" ) ) {
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return;
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}
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ImGui::DragInt( "Iterations" , &rmIterations , .1 , 1 , 512 );
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ImGui::DragFloat( "Step" , &rmStep , .005 , .1 , 2 );
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ImGui::DragFloat( "Max. dist." , &rmMaxDist , .1f ,
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0.01 , 1000.0 , "%.2f" );
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if ( ImGui::DragFloat( "Epsilon" , &epsLog , .01f ,
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-10 , -0.5 , "10 ^ %.2f" ) ) {
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rmEpsilon = pow( 10 , epsLog );
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}
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}
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