Invalid operation when specifying p3d_Color uniform as vec4

[el-dee]

Description

Using latest master commit, 9517ffb, the glgsg throws an Illegal operation error when the uniform p3d_Color is specified as vec4 in GLSL code. Specifying it as vec3 is fine though

Using p3d_Color as vec4 works with 1.10.x and older version of the master branch

Steps to Reproduce

from panda3d.core import  CardMaker, Shader, PandaSystem, load_prc_file_data
from direct.showbase.ShowBase import ShowBase

print("Panda version: %s (%s) by %s (%s)" % (PandaSystem.getVersionString(),
                                             PandaSystem.getGitCommit(),
                                             PandaSystem.getDistributor(),
                                             PandaSystem.getBuildDate()))

load_prc_file_data("", "gl-check-errors #t")

def shader():
    return Shader.make(Shader.SL_GLSL,
                       vertex="""
#version 410

uniform mat4 p3d_ProjectionMatrix;
uniform mat4 p3d_ModelViewMatrix;

uniform vec4 p3d_Color;
//uniform vec3 p3d_Color;


in vec4 p3d_Vertex;
out vec4 color;

void main() {
    gl_Position = p3d_ProjectionMatrix * (p3d_ModelViewMatrix * p3d_Vertex);
    color = p3d_Color;
    //color = vec4(p3d_Color, 1);
}
""",
                       fragment="""
#version 410

in vec4 color;
out vec4 frag_color;

void main() {
    frag_color = color;
}
""")


base = ShowBase()
cm = CardMaker('card')
card = base.render.attach_new_node(cm.generate())
card.setPos(-0.5, 3, -0.5)
card.set_color((1, 0, 1, 1))
card.set_shader(shader())

base.run()

The output is

Panda version: 1.11.0 (9517ffb320fbd30f401e1550c6413a25f355e273) by cosmonium (Jan 20 2024 11:32:58)
Known pipe types:
  glxGraphicsPipe
(all display modules loaded.)
:display:gsg:glgsg(error): at 2338 of panda/src/glstuff/glShaderContext_src.cxx : invalid operation

Environment

• Operating system: Ubuntu
• System architecture: x86_64
• Panda3D version: master : 9517ffb
• Installation method: Built from source
• Python version (if using Python): 3.8
• Compiler (if using C++): N/A