95 lines
1.9 KiB
C++
95 lines
1.9 KiB
C++
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#include "externals.hh"
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#include "texture.hh"
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T_Texture::T_Texture(
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__rd__ const uint32_t width ,
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__rd__ const uint32_t height ,
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__rd__ const E_TexType type ,
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__rd__ const uint32_t levels )
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: width_( width ) , height_( height )
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{
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assert( levels > 0 );
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glGenTextures( 1 , &id_ );
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glBindTexture( GL_TEXTURE_2D , id_ );
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GLenum ifmt , fmt , dt;
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switch ( type ) {
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case E_TexType::RGBA8:
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ifmt = GL_RGBA8;
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fmt = GL_RGBA;
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dt = GL_UNSIGNED_BYTE;
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break;
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case E_TexType::RGBA16F:
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ifmt = GL_RGBA16F;
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fmt = GL_RGBA;
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dt = GL_FLOAT;
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break;
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case E_TexType::R8:
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ifmt = GL_R8;
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fmt = GL_RED;
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dt = GL_UNSIGNED_BYTE;
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break;
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case E_TexType::R16F:
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ifmt = GL_R16F;
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fmt = GL_RED;
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dt = GL_FLOAT;
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break;
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}
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glTexParameteri( GL_TEXTURE_2D , GL_TEXTURE_MIN_LOD , 0 );
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glTexParameteri( GL_TEXTURE_2D , GL_TEXTURE_MAX_LOD , levels - 1 );
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uint32_t w = width , h = height;
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for ( auto i = 0u ; i < levels ; i ++ ) {
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glTexImage2D( GL_TEXTURE_2D , i , ifmt , w , h , 0 , fmt , dt , nullptr );
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w >>= 2;
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h >>= 2;
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assert( w && h );
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}
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assert( glGetError( ) == GL_NO_ERROR );
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glBindTexture( GL_TEXTURE_2D , 0 );
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}
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T_Texture::~T_Texture( )
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{
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glDeleteTextures( 1 , &id_ );
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}
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/*============================================================================*/
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T_TextureBinding::T_TextureBinding(
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__rd__ const uint32_t binding )
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: binding_( binding ) , uniform_( 0 ) , texture_( nullptr )
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{ }
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void T_TextureBinding::clear( )
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{
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uniform_ = 0;
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texture_ = nullptr;
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}
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void T_TextureBinding::set(
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__rd__ const uint32_t uniform ,
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__rd__ T_Texture const& texture )
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{
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uniform_ = uniform;
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texture_ = &texture;
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}
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void T_TextureBinding::bind( ) const
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{
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glActiveTexture( GL_TEXTURE0 + binding_ );
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glBindTexture( GL_TEXTURE_2D , texture_ ? texture_->id( ) : 0 );
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glUniform1i( uniform_ , binding_ );
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assert( glGetError( ) == GL_NO_ERROR );
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}
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