Dynamic Shaders

[disco]

Posted by stealth93.




After looking through tr_shader.c from the Q3 source I noticed that s_shaderText is a string of all the shaders loaded from the pk3s by the game. To add our own shader defitions all we need to do concatenate our dynamic shaders to this string before registering our local shaders.

Example:

// Offset is for linux v1.0.263

strcat(*((char **)(quakeLiveLibAddress + 0x315500)), "\nbottom\n{\ndeformVertexes \
wave 100 sin 0 0 0 0\n{\nblendfunc GL_SRC_ALPHA GL_SRC_ALPHA\nmap *white\n \
rgbGen entity\n}\n}\ntop\n{\ndeformVertexes wave 100 sin 0 0 0 0\n{\nmap *white\n \
rgbGen entity\n}\n}\n");

qlhShader_top = orig_RE_RegisterShader("top");
qlhShader_bottom = orig_RE_RegisterShader("bottom");

A printf of s_shaderText to console after concatenating:

.
.
.
textures/sfx2/jumppad_q1metal7_98
{
qer_editorimage textures/sfx2/bouncepad_q1metal7_98.tga
surfaceparm nodamage
q3map_lightimage textures/sfx/jumppadsmall.tga
q3map_surfacelight 1000
nopicmip
{
map textures/sfx2/bouncepad_q1metal7_98.tga
rgbGen identity
}
{
map $lightmap
rgbGen identity
blendfunc gl_dst_color gl_zero
}
{
map textures/sfx/bouncepad01b_layer1.tga
blendfunc gl_one gl_one
rgbGen wave sin .5 .5 0 1.5
}
{
clampmap textures/sfx/jumppadsmall.tga
blendfunc gl_one gl_one
tcMod stretch sin 1.2 .8 0 1.5
rgbGen wave square .5 .5 .25 1.5
}
}
bottom
{
deformVertexes wave 100 sin 0 0 0 0
{
blendfunc GL_SRC_ALPHA GL_SRC_ALPHA
map *white
rgbGen entity
}
}
top
{
deformVertexes wave 100 sin 0 0 0 0
{
map *white
rgbGen entity
}
}

Its there!
Example in action attached. This should work for other Q3 based games aswell.