Panda 1.8: incorrectly generated shaders by shader generator

[consultit]

Operating system : debian squeeze 64 bit
Version of panda3d : Panda 1.8 official and latest builds

By running this code "panda" model is incorrectly textured

from direct.actor.Actor import Actor
from direct.showbase.ShowBase import ShowBase
from panda3d.core import loadPrcFileData
loadPrcFileData('', 'dump-generated-shaders 1')
app = ShowBase()
pandaActor = Actor("models/panda")
pandaActor.reparentTo(app.render)
#model = app.loader.loadModel("smiley")
#model.reparentTo(app.render)
app.render.setShaderAuto()
app.cam.setPos(0.0, -40.0, 5.0)
app.run()

and in fact it generates fragment shaders that don't use the sampled texture:

...
void fshader(
  uniform sampler2D tex_0,
  in float4 l_texcoord0 : TEXCOORD0,
  out float4 o_color : COLOR0,
  uniform float4 attr_color,
  uniform float4 attr_colorscale
) {
  float4 result;
  // Fetch all textures.
  float4 tex0 = tex2D(tex_0, l_texcoord0.xy); <------- not used
  result = float4(1,1,1,1);
  result *= attr_colorscale;
  o_color = result * 1.000001;
}

but for "smiley" model the generated shader seems to be correct:

void fshader(
  uniform sampler2D tex_0,
  in float4 l_texcoord0 : TEXCOORD0,
  out float4 o_color : COLOR0,
  uniform float4 attr_color,
  uniform float4 attr_colorscale
) {
  float4 result;
  // Fetch all textures.
  float4 tex0 = tex2D(tex_0, l_texcoord0.xy);
  result = float4(1,1,1,1);
  result.rgb *= tex0;
  result *= attr_colorscale;
  o_color = result * 1.000001;
}

On panda3d 1.7 all shaders are correctly generated.

Bye

[rdb (rdb)]

Thanks for reporting. I've been able to reproduce the issue and I've checked in a fix. It'll be available in 1.8.1.

A workaround is to ensure that textures are of format F_rgba, F_rgb or F_alpha.