Texture coordinates?!

Texture coordinates?!

• kperson

  Looking at this I don't see anything wrong with your co-ordinates. Have you checked the texture itself to make sure it isn't corrupted and is being loaded into XNA in the correct format
  
  At first glance it looks as though the texture is not loaded correctly. Can you show us the shader you are using
  
  
  

• Jim Wooley

  I'm using custom shader and it should be fine because I've used it with normal DX.
  
  http://img133.imageshack.us/img133/146/jokubugaahy7.jpg <-- something strange with texture coords..
  
  

• BrianMcCashin

  Shawn Hargreaves wrote:

  You aren't setting any vertex shader here: is that set up elsewhere in your code If you aren't specifically setting a vertex shader, this rendering will just be inheriting whatever was previously set. My guess would be the previous vertex shader isn't passing through texture coordinates.

  
  
  I defined vertex shader it's still not working. Now it will just throw an exeception (InvalidCallException, ErrorCode=-2147467259) when DrawUserPrimitives is called. Is there any sample/tutorial how simple texture screen aligned should be done with XNA
  
  
  EDIT: My mistake BeginScene() was commented out  Big thanks to Shawn!
  
  

• Kevin Hoffman

  You aren't setting any vertex shader here: is that set up elsewhere in your code
  
  If you aren't specifically setting a vertex shader, this rendering will just be inheriting whatever was previously set. My guess would be the previous vertex shader isn't passing through texture coordinates.
  
  
  

• BJ Custard

  Texture should be fine because I've tried various textures.
  
  Shader code:
  
  // GLOBALS
  //
  uniform float waveFreq = 0.0;
  uniform float waveAmp = 0.0;
  uniform float time = 0.0;
  
  texture SCENE
  <
  string name = "SCENE";
  >;
  
  uniform sampler2D tex0;
  
  
  // STRUCTRS
  //
  struct PS_IN
  {
  float4 t0 : TEXCOORD0;
  };
  
  struct PS_OUT
  {
  float4 c0 : COLOR;
  };
  
  
  // PS ENTRY POINT
  //
  PS_OUT main(PS_IN ps_in)
  {
  float PI = 3.14159;
  
  // point
  float4 point = ps_in.t0 - float4(0.5, 0.5, 0.0, 0.1);
  
  // radius
  float radius = sqrt(point.x * point.x + point.y * point.y);
  
  // angles
  float cosAngle = point.x / radius;
  float sinAngle = point.y / radius;
  
  // calculate wave angle
  float waveAngle = (radius - time) * waveFreq;
  waveAngle = fmod(waveAngle, 2 * PI);
  
  // calculate offset
  float offset = 1 - cos(waveAngle - PI);
  offset *= waveAmp;
  
  // new radius
  float newRadius = radius + offset;
  
  // new point
  float4 newPoint = float4(newRadius * cosAngle + 0.5, newRadius * sinAngle + 0.5, 0.0, 0.1);
  
  PS_OUT ps_out;
  ps_out.c0 = tex2D(tex0, newPoint);
  ps_out.c0 += float4(time, 0.0, 0.0, 0.0);
  
  return ps_out;
  }
  
  // PASSES
  //
  technique ripple
  {
  pass
  {
  Sampler[0] = sampler_state
  {
  Texture = (SCENE);
  };
  
  CullMode = None;
  MultiSampleAntiAlias = TRUE;
  AlphaBlendEnable = TRUE;
  
  PixelShader = compile ps_2_0 main();
  }
  }
  
  

• Irfon Subhan

  Texture coordinates will normally range from 0,0 (the top left of the texture) to 1,1 (the bottom right), but this depends on what shader you are using to render the polygon.
  
  Are you using BasicEffect for this, or a custom shader
  
  What exactly is the problem with your output A bit more detail about how the image is looking wrong would be useful to help diagnose this.
  
  
  
• Texture coordinates?!