Java-Gaming.org Hi !
Featured games (84)
games approved by the League of Dukes
Games in Showcase (602)
Games in Android Showcase (171)
games submitted by our members
Games in WIP (650)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
 
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Passing vertex attributes to vertex shaders  (Read 653 times)
0 Members and 1 Guest are viewing this topic.
Offline JonnyGingerKid

Junior Devvie


Exp: 3 years



« Posted 2014-05-03 23:52:21 »

So I've recently been messing around with GLSL and wrote a simple pair of vertex/fragment shaders as a test for vertex attributes. Here they are:

Vertex:

#version 330

layout (location = 0) in vec2 VertexPosition;
layout (location = 1) in vec3 VertexColor;

out vec3 Color;

void main(){
   Color = VertexColor;
   gl_Position = vec4(VertexPosition, 0.0, 1.0);
   
}

Fragment:

#version 330

out vec4 FragColor
in vec3 Color;

void main(){
   FragColor = vec4(Color, 1.0);
   
}

I pass in the vertex attributes like this:

shader.bind();
      
glEnableVertexAttribArray(0);
//Map index 0 to the position buffer
glBindBuffer(GL_ARRAY_BUFFER, vboVertexBuffer);
glBindAttribLocation(shader.getProgram(), 0, "VertexPosition"); //not sure if this line's necessary
glVertexAttribPointer(0, 2, GL_FLOAT, false, 2*4, 0);
glDisableVertexAttribArray(0);
      
glEnableVertexAttribArray(1);
//Map index 1 to the color buffer
glBindBuffer(GL_ARRAY_BUFFER, vboColorBuffer);
glBindAttribLocation(shader.getProgram(), 1, "VertexColor");
glVertexAttribPointer(1, 3, GL_FLOAT, false, 3*4, 0);
glDisableVertexAttribArray(1);
      
shader.unbind();
      
shader.compile(); //links and validates the shader

I run it and get a black screen. What a wonderful thing GLSL is that it can produce such beautiful black screens xD. I have this colored triangle I rendered with VBO that renders without the shader, but not with the shader. Any ideas on why?
Offline SHC
« Reply #1 - Posted 2014-05-04 03:50:26 »

There is no need to use
glBindAttribLocation()
if you are using layout in the shaders.

Offline StrideColossus
« Reply #2 - Posted 2014-05-04 08:30:49 »

Compile the shader before binding the vertex attributes?
Post the rendering code as well.
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline SHC
« Reply #3 - Posted 2014-05-04 08:43:08 »

I recommend to give a read to my articles.

http://goharsha.com/lwjgl-tutorial-series/encapsulating-shaders/
http://goharsha.com/lwjgl-tutorial-series/the-first-triangle/

Pages: [1]
  ignore  |  Print  
 
 
You cannot reply to this message, because it is very, very old.

 
Jesse (16 views)
2015-07-29 04:35:27

Riven (37 views)
2015-07-27 16:38:00

Riven (18 views)
2015-07-27 15:35:20

Riven (21 views)
2015-07-27 12:26:13

Riven (12 views)
2015-07-27 12:23:39

BurntPizza (30 views)
2015-07-25 00:14:37

BurntPizza (42 views)
2015-07-24 22:06:39

BurntPizza (24 views)
2015-07-24 06:06:53

NoxInc (31 views)
2015-07-22 22:16:53

NoxInc (20 views)
2015-07-22 22:13:39
List of Learning Resources
by gouessej
2015-07-09 11:29:36

How Do I Expand My Game?
by bashfrog
2015-06-14 11:34:43

List of Learning Resources
by PocketCrafter7
2015-05-31 05:37:30

Intersection Methods
by Roquen
2015-05-29 08:19:33

List of Learning Resources
by SilverTiger
2015-05-05 10:20:32

How to: JGO Wiki
by Mac70
2015-02-17 20:56:16

2D Dynamic Lighting
by ThePixelPony
2015-01-01 20:25:42

How do I start Java Game Development?
by gouessej
2014-12-27 19:41:21
java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!