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POLibGDX - Shader working on Desktop but not on Android
 

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  1. POLibGDX - Shader working on Desktop but not on Android
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    <p>I have written a simple program that renders a sphere in a 3d environment and colores it according to four light sources around the sphere. When I run the program on the desktop it works just fine but on an Android device the sphere is just plain colored.</p> <p>Here are images to illustrate what I am talking about:</p> <p><img src="https://i.stack.imgur.com/gMASW.png" alt="enter image description here"> -> Desktop</p> <p><img src="https://i.stack.imgur.com/Htpjv.png" alt="enter image description here"> -> Android</p> <p>And here is the shader code:</p> <p><strong>sphere.vert</strong></p> <pre><code>#ifdef GL_ES precision mediump float; #endif uniform mat4 u_projectionMatrix; uniform mat3 u_normalMatrix; uniform mat4 u_modelViewMatrix; const int MAX_LIGHTS = 8; uniform int u_lights_active; uniform vec3 u_ambient; uniform vec3 u_position[ MAX_LIGHTS ]; uniform vec3 u_diffuse[ MAX_LIGHTS ]; uniform vec3 u_att_coeffs[ MAX_LIGHTS ]; // since builtins aren't used, we use attributes as substitute attribute vec2 a_texCoord0; attribute vec4 a_position; attribute vec3 a_normal; // outputs to fragment shader varying vec2 v_tex_coord; varying vec4 v_color; void main() { vec3 tempColor = u_ambient; vec3 ecPosition = vec3( u_modelViewMatrix * a_position ); vec3 viewVec = normalize( -ecPosition ); vec3 tnorm = normalize( u_normalMatrix * a_normal ); for ( int i = 0; i &lt; u_lights_active; ++i ) { float dist = length( ecPosition - u_position[i] ); // distance from light to fragment float att = 1.0 / ( u_att_coeffs[i].x + u_att_coeffs[i].y*dist + u_att_coeffs[i].z*dist*dist ); vec3 lightVec = normalize( u_position[i] - ecPosition ); float diffuse = max( dot( lightVec, tnorm ), 0.0 ); tempColor += att * u_diffuse[i] * diffuse; } tempColor = clamp( tempColor, 0.0, 1.0 ); v_color = vec4( tempColor, 0.0 ); gl_Position = u_projectionMatrix * vec4( ecPosition, 1.0 ); v_tex_coord = a_texCoord0.xy; } </code></pre> <p><strong>sphere.frag</strong></p> <pre><code>#ifdef GL_ES precision mediump float; #endif uniform sampler2D u_texture; varying vec2 v_tex_coord; varying vec4 v_color; void main() { vec4 texColor = texture2D( u_texture, v_tex_coord ); gl_FragColor = texColor * v_color; } </code></pre> <p>I really hope that one of you guys can explain to me, what I'm doing wrong.</p> <p><strong>Version Numbers:</strong></p> <p>LibGDX: 0.9.8</p> <p>ADT: Build v22.0.1-685705</p> <p>Android Device: Sony Xperia S, Android 4.1.2</p> <p>Project Build Target: Android 4.3, API 18</p> <p><strong>Mainfest contains</strong></p> <pre><code>&lt;uses-feature android:glEsVersion="0x00020000" android:required="true" /&gt; </code></pre> <p><strong>The shader is created by:</strong></p> <pre><code>shaderProgram = new ShaderProgram( Gdx.files.internal( "shaders/sphere.vert" ), Gdx.files.internal( "shaders/sphere.frag" ) ); if ( !shaderProgram.isCompiled() ) { Gdx.app.error( TAG, shaderProgram.getLog() ); } </code></pre> <p><strong>The sphere is a StillModel:</strong></p> <p><strong>creation:</strong></p> <pre><code>final ModelLoaderHints hint = new ModelLoaderHints( true ); model = ModelLoaderRegistry.loadStillModel( Gdx.files.internal( "data/sphere.obj" ), hint ); texture = new Texture( Gdx.files.internal( "data/sphere_tex.png" ), Format.RGB888, false ); material = new Material( "mat", new TextureAttribute( texture, 0, "u_texture" ) ); </code></pre> <p><strong>rendering:</strong></p> <pre><code>shaderProgram.begin(); texture.bind( 0 ); shaderProgram.setUniformMatrix( C.U_PROJECTION_MATRIX, cam.projection ); // light values shaderProgram.setUniformi( C.U_LIGHTS_ACTIVE, lightsActive ); shaderProgram.setUniform3fv( C.U_LIGHT_AMBIENT, lightAmbient, 0, 3 ); shaderProgram.setUniform3fv( C.U_LIGHT_POSITION, lightPosition, 0, 3 * lightsActive ); shaderProgram.setUniform3fv( C.U_LIGHT_DIFFUSE, lightDiffuse, 0, 3 * lightsActive ); shaderProgram.setUniform3fv( C.U_LIGHT_ATT_COEFFS, lightAttCoeffs, 0, 3 * lightsActive ); modelMatrix.setToTranslation( positionWrap ); modelMatrix.rotate( rotationAxis, rotation ); modelMatrix.scale( scaleX, scaleY, scaleZ ); modelViewMatrix.set( cam.view ).mul( modelMatrix ); normalMatrix.set( modelViewMatrix ).inv().tra(); shaderProgram.setUniformMatrix( C.U_NORMAL_MATRIX, normalMatrix3x3.set( normalMatrix ) ); shaderProgram.setUniformMatrix( C.U_MODEL_VIEW_MATRIX, modelViewMatrix ); stillModel.render( shaderProgram ); shaderProgram.end(); </code></pre> <p>Hope this is all the information needed.</p> <p>Thanks in advance!</p>
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      1. POLibGDX - Shader working on Desktop but not on Android
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    1. COYour vertex shader and fragment shader are backwards, I am surprised this works on either system to be honest.
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      1. POLibGDX - Shader working on Desktop but not on Android
      1. USAndon M. Coleman
    2. COwhat android device are you testing and what is the sdk ur using
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      1. POLibGDX - Shader working on Desktop but not on Android
      1. USMethnani Bilel
    3. CO@Andon M. Coleman: you are right, but this is just a typo here :) @ Methnani Bilel: I added versions to the question
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      1. POLibGDX - Shader working on Desktop but not on Android
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