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Tweaking bloom some more

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This commit is contained in:
Emmanuel BENOîT 2017-09-30 21:22:38 +02:00
parent f3d709a48d
commit 34b393334c
6 changed files with 67 additions and 62 deletions
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2
Makefile
View file

@ -1,4 +1,4 @@
CXXFLAGS += $(shell sdl2-config --cflags) -std=c++14 -Wall
CXXFLAGS += $(shell sdl2-config --cflags) -std=c++14 -Wall -g
CFLAGS += $(shell sdl2-config --cflags)
CPPFLAGS += -I. -Iimgui -Iglm \
-DREAL_BUILD -DGLM_ENABLE_EXPERIMENTAL

8
bloom-combine.glsl
View file

@ -12,11 +12,13 @@ void main( void )
vec2 tmp = gl_FragCoord.xy / u_OutputSize;
float f = u_Parameters.x;
color = textureLod( u_MainInput , tmp , 0 ).rgb;
vec3 bloom = vec3( 0 );
for ( int i = 0 ; i < 5 ; i ++ ) {
color += f * textureLod( u_BlurInput , tmp , i ).rgb;
f *= u_Parameters.y;
bloom += f * textureLod( u_BlurInput , tmp , i ).rgb;
f = pow( f , u_Parameters.y + 1 );
}
color = color + bloom / 2.2;
color = color / ( color + 1. );
color = pow( color , vec3( 2.2 ) );
color = pow( color , vec3( 1.0 / 2.2 ) );
}

70
bloom.cc
View file

@ -12,12 +12,10 @@ T_BloomPass::T_BloomPass(
__rw__ T_Texture& input )
: input_( input ) ,
spHighpass_( GL_FRAGMENT_SHADER , watcher ) ,
spDownsample_( GL_FRAGMENT_SHADER , watcher ) ,
spBlur_( GL_FRAGMENT_SHADER , watcher ) ,
spCombine_( GL_FRAGMENT_SHADER , watcher ) ,
//
txInput_( width , height , E_TexType::RGB16F ) ,
rtInput_( T_RendertargetSetup( ).add( txInput_ , 0 ).create( ) ) ,
//
txBlur0_( width , height , E_TexType::RGB16F , BloomLevels ) ,
txBlur1_( width , height , E_TexType::RGB16F , BloomLevels ) ,
//
@ -27,7 +25,6 @@ T_BloomPass::T_BloomPass(
combineStrength_( 0.7 ) ,
combineAttenuation_( 0.3 )
{
txInput_.wrap( E_TexWrap::CLAMP_BORDER ).samplingMode( E_TexSampling::LINEAR );
txBlur0_.wrap( E_TexWrap::CLAMP_EDGE ).samplingMode( E_TexSampling::LINEAR );
txBlur1_.wrap( E_TexWrap::CLAMP_EDGE ).samplingMode( E_TexSampling::LINEAR );
@ -37,10 +34,12 @@ T_BloomPass::T_BloomPass(
}
spHighpass_.addFile( "bloom-highpass.glsl" );
spDownsample_.addFile( "downsample.glsl" );
spBlur_.addFile( "blur-pass.glsl" );
spCombine_.addFile( "bloom-combine.glsl" );
spHighpass_.load( );
spDownsample_.load( );
spBlur_.load( );
spCombine_.load( );
}
@ -54,7 +53,7 @@ void T_BloomPass::render( )
U_INPUT_SIZE = 2 ,
U_PARAMS = 3 ,
};
rtInput_.activate( );
rtBlur0_[ 0 ].activate( );
T_TextureBinding tb( 0 );
tb.set( U_TEXTURE , input_ );
tb.bind( );
@ -65,56 +64,45 @@ void T_BloomPass::render( )
glUniform3fv( U_PARAMS , 1 , filterParams_ );
glRectf( -1, -1 , 1 , 1 );
}
assert( glGetError( ) == GL_NO_ERROR );
if ( spBlur_.activate( ) ) {
enum {
U_TEXTURE = 0 ,
U_OUTPUT_SIZE = 1 ,
U_INPUT_SIZE = 2 ,
U_SOURCE_LOD = 3 ,
U_DIRECTION = 4 ,
U_WEIGHTS = 5 ,
U_SOURCE_LOD = 2 ,
U_DIRECTION = 3 ,
U_WEIGHTS = 4 ,
};
glUniform4fv( U_WEIGHTS , 1 , blurWeights_ );
for ( int i = 0 ; i < 5 ; i ++ ) {
// IB RMO B0 B1 B0 B1 B0
// OB B0/0 B1/0 B0/1 B1/1 B0/2 B1/2
// SLOD: 0 0 0 1 1 2
// IW: W W W W/2 W/2 W/4
// OW: W W W/2 W/2 W/4 W/4
for ( auto i = 0u ; i < BloomLevels ; i ++ ) {
T_TextureBinding tb( 0 );
uint32_t w , h;
if ( i == 0 ) {
tb.set( U_TEXTURE , txInput_ );
w = txInput_.width( );
h = txInput_.height( );
} else {
tb.set( U_TEXTURE , txBlur1_ );
w = txBlur1_.width( ) >> ( i - 1 );
h = txBlur1_.height( ) >> ( i - 1 );
if ( i > 0 ) {
spDownsample_.activate( );
rtBlur0_[ i ].activate( );
tb.set( 0 , txBlur0_ );
tb.bind( );
glUniform2f( 1 , txBlur0_.width( ) >> i ,
txBlur0_.height( ) >> i );
glUniform1i( 2 , i - 1 );
glRectf( -1 , -1 , 1 , 1 );
}
const uint32_t slod = i > 0 ? ( i - 1 ) : 0;
rtBlur0_[ i ].activate( );
spBlur_.activate( );
glUniform4fv( U_WEIGHTS , 1 , blurWeights_ );
glUniform2f( U_OUTPUT_SIZE , rtBlur0_[ i ].width( ) ,
rtBlur0_[ i ].height( ) );
glUniform1i( U_SOURCE_LOD , slod );
glUniform2f( U_INPUT_SIZE , w , h );
glUniform2f( U_DIRECTION , blurSize_ , 0 );
tb.bind( );
glRectf( -1 , -1 , 1 , 1 );
glUniform1i( U_SOURCE_LOD , i );
rtBlur1_[ i ].activate( );
glUniform2f( U_DIRECTION , blurSize_ , 0 );
tb.set( U_TEXTURE , txBlur0_ );
tb.bind( );
glUniform2f( U_DIRECTION , 0 , blurSize_ );
glUniform1i( U_SOURCE_LOD , i );
glUniform2f( U_INPUT_SIZE ,
rtBlur0_[ i ].width( ) ,
rtBlur0_[ i ].height( ) );
glRectf( -1 , -1 , 1 , 1 );
}
rtBlur0_[ i ].activate( );
glUniform2f( U_DIRECTION , 0 , blurSize_ );
tb.set( U_TEXTURE , txBlur1_ );
tb.bind( );
glRectf( -1 , -1 , 1 , 1 );
}
T_Rendertarget::MainOutput( );
@ -124,7 +112,7 @@ void T_BloomPass::render( )
T_TextureBinding main( 0 ) , blur( 1 );
main.set( 0 , input_ );
main.bind( );
blur.set( 1 , txBlur1_ );
blur.set( 1 , txBlur0_ );
blur.bind( );
glUniform2f( 2 , input_.width( ) , input_.height( ) );
glUniform2f( 3 , combineStrength_ , 1 - combineAttenuation_ );

4
bloom.hh
View file

@ -29,12 +29,10 @@ struct T_BloomPass
T_Texture& input_;
T_ShaderProgram spHighpass_;
T_ShaderProgram spDownsample_;
T_ShaderProgram spBlur_;
T_ShaderProgram spCombine_;
T_Texture txInput_;
T_Rendertarget rtInput_;
T_Texture txBlur0_ , txBlur1_;
std::vector< T_Rendertarget > rtBlur0_ , rtBlur1_;

7
blur-pass.glsl
View file

@ -2,10 +2,9 @@
layout( location = 0 ) uniform sampler2D u_InputTexture;
layout( location = 1 ) uniform vec2 u_OutputSize;
layout( location = 2 ) uniform vec2 u_InputSize;
layout( location = 3 ) uniform int u_SourceLOD;
layout( location = 4 ) uniform vec2 u_Direction;
layout( location = 5 ) uniform vec4 u_Weights;
layout( location = 2 ) uniform int u_SourceLOD;
layout( location = 3 ) uniform vec2 u_Direction;
layout( location = 4 ) uniform vec4 u_Weights;
layout( location = 0 ) out vec3 color;

18
downsample.glsl Normal file
View file

@ -0,0 +1,18 @@
#version 450 core
layout( location = 0 ) uniform sampler2D u_InputTexture;
layout( location = 1 ) uniform vec2 u_OutputSize;
layout( location = 2 ) uniform int u_SourceLOD;
layout( location = 0 ) out vec3 color;
void main( void )
{
const vec2 c = gl_FragCoord.xy;
color = ( .25 * (
textureLod( u_InputTexture , ( c + vec2( .5 , .5 ) ) / u_OutputSize , u_SourceLOD )
+ textureLod( u_InputTexture , ( c + vec2(-.5 , .5 ) ) / u_OutputSize , u_SourceLOD )
+ textureLod( u_InputTexture , ( c + vec2( .5 ,-.5 ) ) / u_OutputSize , u_SourceLOD )
+ textureLod( u_InputTexture , ( c + vec2(-.5 ,-.5 ) ) / u_OutputSize , u_SourceLOD )
) ).rgb;
}