ilikecats/stk-code_catmod
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Make marks fade to transparent (not 100% sure), instead of white ghost.

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Pretty much an exercise in guessing if things are premul or not, and what has
to be pure black or can be a more real dark grey. Maybe needs more changes.


git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@4414 178a84e3-b1eb-0310-8ba1-8eac791a3b58
This commit is contained in:
mbjornstk 2010-01-08 01:09:14 +00:00
parent da2ef9b203
commit 9739d1e1b3
2 changed files with 11 additions and 4 deletions
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13
src/graphics/skid_marks.cpp
View File

@ -26,6 +26,9 @@
float SkidMarks::m_avoid_z_fighting = 0.0f;
const int SkidMarks::m_start_alpha = 128;
const int SkidMarks::m_start_grey = 32;
//const int start_premul = SkidMarks::m_start_grey * SkidMarks::m_start_alpha / 256; compiler whines about private later
const int start_premul = 32 * 128 / 256;
/** Initialises empty skid marks. */
SkidMarks::SkidMarks(const Kart& kart, float width) : m_kart(kart)
@ -33,7 +36,8 @@ SkidMarks::SkidMarks(const Kart& kart, float width) : m_kart(kart)
m_width = width;
m_material = new video::SMaterial();
m_material->MaterialType = video::EMT_TRANSPARENT_VERTEX_ALPHA;
m_material->AmbientColor = video::SColor(128, 16, 16, 16);
m_material->AmbientColor = video::SColor(128, 0, 0, 0); // or should be start_premul?
// m_material->DiffuseColor = video::SColor(SkidMarks::m_start_alpha, start_premul, start_premul, start_premul); compiler whines about private
m_material->DiffuseColor = video::SColor(128, 16, 16, 16);
m_material->Shininess = 0;
m_skid_marking = false;
@ -270,16 +274,17 @@ void SkidMarks::SkidMarkQuads::fade(float f)
{
m_fade_out += f;
// Changing the alpha value is quite expensive, so it's only done
// about 10 times till 0 is reached.
// about 10 times till 0 is reached.
if(m_fade_out*10>SkidMarks::m_start_alpha)
{
video::SColor &c=Material.DiffuseColor;
int a=c.getAlpha();
a -= a<m_fade_out ? a : (int)m_fade_out;
c.setAlpha(a);
int premul_grey = a * SkidMarks::m_start_grey / 255;
c.set(a, premul_grey, premul_grey, premul_grey);
for(unsigned int i=0; i<Vertices.size(); i++)
{
Vertices[i].Color.setAlpha(a);
Vertices[i].Color.set(a, premul_grey, premul_grey, premul_grey);
}
m_fade_out = 0.0f;
}

2
src/graphics/skid_marks.hpp
View File

@ -44,6 +44,8 @@ private:
int m_current;
/** Initial alpha value. */
static const int m_start_alpha;
/** Initial grey value, same for the 3 channels. */
static const int m_start_grey;
/** Material to use for the skid marks. */
video::SMaterial *m_material;