attrib() not working for POINTS shapes #5895
Description
Description
At the moment I have to work with pointclouds and render them as a PShape of type POINTS. But for animations and other stuff I need for example a target position for each individual point. As shown in #5560 creating new vertex attributes and setting them later works with PShape in processing. So I decided to use the same technique in an example with a few points.
Expected Behavior
I expected to use the defined attribute vert_color in the shader to set the color of my vertices.
Current Behavior
Unfortunately, the vert_color attribute is not set. It is always set to 0.0 and I have no clue why this happens. It does not matter if I change it during creation or after creation of my PShape.
Steps to Reproduce
Just run the following sketch:
PShape shape;
PShader shader;
public void setup() {
size(500, 500, P3D);
shape = createShape();
shape.beginShape(POINTS);
// Visual
shape.noFill();
shape.stroke(255, 0, 0);
// Custom Attribute
shape.attrib("vert_color", 1.0, 0.5, 0.0, 1.0); // Supposed to be Orange
shape.vertex(-100, -100);
shape.vertex(100, -100);
shape.vertex(100, 100);
shape.vertex(-100, 100);
shape.endShape();
// Exemple shader
shader = createShader();
}
public void draw() {
background(255);
shader(shader);
translate(width/2, height/2);
shape(shape);
}
public PShader createShader() {
String[] vert = new String[] {
"#version 150",
"",
"uniform mat4 projection;",
"uniform mat4 modelview;",
"",
"in vec4 position;",
"in vec4 color;",
"in vec2 offset;",
"in vec4 vert_color;",
"",
"out vec4 vertColor;",
"",
"void main() {",
" vec4 pt = position;",
" pt /= 50.0;",
" vec4 pos = modelview * pt;",
" vec4 clip = projection * pos;",
" gl_Position = clip + projection * vec4(offset, 0, 0);",
"",
// setting the vert color
" vertColor = vert_color;",
"}"
};
String[] frag = new String[] {
"#version 150",
"in vec4 vertColor;",
"out vec4 fragColor;",
"",
"void main() {",
" fragColor = vertColor;",
"}"
};
return new PShader(this, vert, frag);
}
void keyPressed() {
for (int i = 0; i < shape.getVertexCount(); i++) {
shape.setAttrib("vert_color", i, random(0f, 1f), random(0f, 1f), random(0f, 1f), 1.0);
}
}Your Environment
- Processing version: 3.5.3
- Operating System and OS version: MacOS 10.14.5
Possible Causes / Solutions
I did not have the time to debug the processing code and see if there is something different to the first example in #5560. But I believe that processing is overwriting something or not pushing to opengl because of the POINTS flag.