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  #1  
Old 11-24-2014, 10:25 PM
mellott124 mellott124 is offline
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Join Date: Jul 2014
Posts: 20
Texture ID in postprocess

When working with shaders in Vizard outside of the postprocess library I can set the Texture ID using viz.setUniformInt('texture',0).

How is this done when I define a class derived from postprocess effect library? Also at what texture ID does vizpp_InputTex sit at? Seems with the postprocess examples there's never any reference to the texture ID. I need to know what the IDs of vizpp_InputTex, redTex, greenTex, and blueTex are.

Beginning of my class below

class warp(vizfx.postprocess.BaseShaderEffect):

def _getFragmentCode(self):
return """
#version 120
uniform sampler2D vizpp_InputTex;
uniform sampler2D redTex;
uniform sampler2D blueTex;
uniform sampler2D greenTex;


etc...
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  #2  
Old 11-25-2014, 09:08 AM
farshizzo farshizzo is offline
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Join Date: Mar 2003
Posts: 2,849
You can add textures through the uniforms attribute of the effect class within the _createUniforms method. Here is a simple example:

Code:
class WarpEffect(vizfx.postprocess.BaseShaderEffect):

	def _getFragmentCode(self):
		return """
		uniform sampler2D vizpp_InputTex;
		uniform sampler2D redTex;
		uniform sampler2D blueTex;
		uniform sampler2D greenTex;
		void main()
		{
			vec2 uv = gl_TexCoord[0].st;
			vec4 color = vec4(1.0);
			color.r = texture2D(vizpp_InputTex, texture2D(redTex, uv).rg).r;
			color.g = texture2D(vizpp_InputTex, texture2D(greenTex, uv).rg).g;
			color.b = texture2D(vizpp_InputTex, texture2D(blueTex, uv).rg).b;
			gl_FragColor = color;
		}
		"""

	def _createUniforms(self):
		
		# Create texture objects
		redTex = viz.addTexture(...)
		greenTex = viz.addTexture(...)
		blueTex = viz.addTexture(...)
		
		# Apply textures to effect (automatically assigns uniform IDs)
		self.uniforms.addTexture('redTex', redTex)
		self.uniforms.addTexture('greenTex', greenTex)
		self.uniforms.addTexture('blueTex', blueTex)

Have a look at the Post-Process basics page in the documentation for more info:

http://docs.worldviz.com/vizard/postprocess_basics.htm
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