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0024344: TKOpenGl - only front side is lighted within Phong GLSL program

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This commit is contained in:
apl 2013-11-13 21:09:55 +04:00 committed by bugmaster
parent 4fe9ad57df
commit c90e941f78
2 changed files with 52 additions and 9 deletions
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24
src/Shaders/PhongShading.fs
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@ -46,13 +46,14 @@ void pointLight (in int theId,
vec3 aHalf = normalize (aLight + theView); vec3 aHalf = normalize (aLight + theView);
float aNdotL = max (0.0, dot (theNormal, aLight)); vec3 aFaceSideNormal = gl_FrontFacing ? theNormal : -theNormal;
float aNdotH = max (0.0, dot (theNormal, aHalf )); float aNdotL = max (0.0, dot (aFaceSideNormal, aLight));
float aNdotH = max (0.0, dot (aFaceSideNormal, aHalf ));
float aSpecl = 0.0; float aSpecl = 0.0;
if (aNdotL > 0.0) if (aNdotL > 0.0)
{ {
aSpecl = pow (aNdotH, occFrontMaterial_Shininess()); aSpecl = pow (aNdotH, gl_FrontFacing ? occFrontMaterial_Shininess() : occBackMaterial_Shininess());
} }
Diffuse += occLight_Diffuse (theId).rgb * aNdotL * anAtten; Diffuse += occLight_Diffuse (theId).rgb * aNdotL * anAtten;
@ -71,13 +72,15 @@ void directionalLight (in int theId,
} }
vec3 aHalf = normalize (aLight + theView); vec3 aHalf = normalize (aLight + theView);
float aNdotL = max (0.0, dot (theNormal, aLight));
float aNdotH = max (0.0, dot (theNormal, aHalf )); vec3 aFaceSideNormal = gl_FrontFacing ? theNormal : -theNormal;
float aNdotL = max (0.0, dot (aFaceSideNormal, aLight));
float aNdotH = max (0.0, dot (aFaceSideNormal, aHalf ));
float aSpecl = 0.0; float aSpecl = 0.0;
if (aNdotL > 0.0) if (aNdotL > 0.0)
{ {
aSpecl = pow (aNdotH, occFrontMaterial_Shininess()); aSpecl = pow (aNdotH, gl_FrontFacing ? occFrontMaterial_Shininess() : occBackMaterial_Shininess());
} }
Diffuse += occLight_Diffuse (theId).rgb * aNdotL; Diffuse += occLight_Diffuse (theId).rgb * aNdotL;
@ -111,9 +114,12 @@ vec4 computeLighting (in vec3 theNormal,
} }
} }
return vec4 (Ambient, 1.0) * occFrontMaterial_Ambient() vec4 aMaterialAmbient = gl_FrontFacing ? occFrontMaterial_Ambient() : occBackMaterial_Ambient();
+ vec4 (Diffuse, 1.0) * occFrontMaterial_Diffuse() vec4 aMaterialDiffuse = gl_FrontFacing ? occFrontMaterial_Diffuse() : occBackMaterial_Diffuse();
+ vec4 (Specular, 1.0) * occFrontMaterial_Specular(); vec4 aMaterialSpecular = gl_FrontFacing ? occFrontMaterial_Specular() : occBackMaterial_Specular();
return vec4 (Ambient, 1.0) * aMaterialAmbient
+ vec4 (Diffuse, 1.0) * aMaterialDiffuse
+ vec4 (Specular, 1.0) * aMaterialSpecular;
} }
//! Entry point to the Fragment Shader //! Entry point to the Fragment Shader

37
tests/v3d/glsl/phong_sides Normal file
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@ -0,0 +1,37 @@
puts "========"
puts "Per-pixel lighting using GLSL program (Phong shading), check lighting of back faces"
puts "========"
# create box
box b 1 2 3
explode b F
# draw box
vinit View1
vclear
vsetdispmode 1
vaxo
vdisplay b_1 b_2
vfit
vrotate 0.2 0.0 0.0
# take snapshot with fixed pipeline
vdump $::imagedir/${::casename}_OFF.png
set aColorB [vreadpixel 150 150 rgb name]
set aColorF [vreadpixel 250 250 rgb name]
if { "$aColorB" != "$aColorF"} {
puts "Error: front/back colors are different!"
}
set aColorFixed $aColorF
# activate phong shader
vshaderprog phong
set aColorB [vreadpixel 150 150 rgb name]
set aColorF [vreadpixel 250 250 rgb name]
if { "$aColorB" != "$aColorF"} {
puts "Error: front/back colors are different!"
}
if { "$aColorF" != "$aColorFixed"} {
puts "Error: colors are different!"
}