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How to use smoothstep function using renderscript in android

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How can we use the smoothstep function in renderscript to smoothen a mask image (already blurred using gaussian blur with kernel size 3 or 5) and make its edges smoother. I tried the following code in other frameworks and they worked as expected.

iOS shader code:-

let kernelStr = """
 kernel vec4 myColor(__sample source) 
 float maskValue = smoothstep(0.3, 0.5, source.r);
 return vec4(maskValue,maskValue,maskValue,1.0);
 
 """

In opengl glsl fragment shader:-

 float mask = btex.r;
 float maskValue = smoothstep(0.3, 0.5, mask);
 vec4 ress = vec4(maskValue,maskValue,maskValue,1.0);

android masking renderscript

share|improve this question

asked Mar 27 at 19:17

user3177661user3177661

641010 bronze badges

add a comment | 

0

How can we use the smoothstep function in renderscript to smoothen a mask image (already blurred using gaussian blur with kernel size 3 or 5) and make its edges smoother. I tried the following code in other frameworks and they worked as expected.

iOS shader code:-

let kernelStr = """
 kernel vec4 myColor(__sample source) 
 float maskValue = smoothstep(0.3, 0.5, source.r);
 return vec4(maskValue,maskValue,maskValue,1.0);
 
 """

In opengl glsl fragment shader:-

 float mask = btex.r;
 float maskValue = smoothstep(0.3, 0.5, mask);
 vec4 ress = vec4(maskValue,maskValue,maskValue,1.0);

android masking renderscript

share|improve this question

asked Mar 27 at 19:17

user3177661user3177661

641010 bronze badges

add a comment | 

How can we use the smoothstep function in renderscript to smoothen a mask image (already blurred using gaussian blur with kernel size 3 or 5) and make its edges smoother. I tried the following code in other frameworks and they worked as expected.

iOS shader code:-

let kernelStr = """
 kernel vec4 myColor(__sample source) 
 float maskValue = smoothstep(0.3, 0.5, source.r);
 return vec4(maskValue,maskValue,maskValue,1.0);
 
 """

In opengl glsl fragment shader:-

 float mask = btex.r;
 float maskValue = smoothstep(0.3, 0.5, mask);
 vec4 ress = vec4(maskValue,maskValue,maskValue,1.0);

android masking renderscript

share|improve this question

asked Mar 27 at 19:17

user3177661user3177661

641010 bronze badges

let kernelStr = """
 kernel vec4 myColor(__sample source) 
 float maskValue = smoothstep(0.3, 0.5, source.r);
 return vec4(maskValue,maskValue,maskValue,1.0);
 
 """

 float mask = btex.r;
 float maskValue = smoothstep(0.3, 0.5, mask);
 vec4 ress = vec4(maskValue,maskValue,maskValue,1.0);

android masking renderscript

android masking renderscript

share|improve this question

asked Mar 27 at 19:17

user3177661user3177661

641010 bronze badges

share|improve this question

asked Mar 27 at 19:17

user3177661user3177661

641010 bronze badges

asked Mar 27 at 19:17

user3177661user3177661

641010 bronze badges

asked Mar 27 at 19:17

user3177661user3177661

641010 bronze badges

1 Answer
1

active

oldest

votes

1

RenderScript doesn't have a buit-in smoothstep function, so the simplest thing is to implement it yourself. Next the source ready to be used in your scripts:

static inline float smoothstep(float edge0, float edge1, float x)

 float value = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
 return value * value * (3.0f - 2.0f * value);

Example of usage:

static inline float smoothstep(float edge0, float edge1, float x)

 float value = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
 return value * value * (3.0f - 2.0f * value);


uchar4 RS_KERNEL root(uint32_t x, uint32_t y)

 ....
 float mask = btex.r;
 float maskValue = smoothstep(0.3f, 0.5f, mask);
 float4 ress = (float4)maskValue, maskValue, maskValue, 1.0f;
 ....

And next a link about how smoothstep internally works, in case you have any other doubts:

smoothstep

Enjoy

share|improve this answer

edited Mar 27 at 21:11

answered Mar 27 at 19:29

PerracoLabsPerracoLabs

5,06988 gold badges4141 silver badges7878 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  However ,in the following links they do mention about smoothstep functions.. May be they are not currently implemented in rs
  
  – user3177661
  Mar 27 at 19:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The link in the answer is not related to RenderScript, is just a link about information about how the general smoothstep function works, in case you want to write your own function. And as stated in the answer, RenderScript doesn't have a smoothstep function, so you can use the one I put in the answer, which is a smoothstep function written 100% in RenderScript.
  
  – PerracoLabs
  Mar 27 at 21:06
  
  

  
  
  
  

add a comment | 

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1

RenderScript doesn't have a buit-in smoothstep function, so the simplest thing is to implement it yourself. Next the source ready to be used in your scripts:

static inline float smoothstep(float edge0, float edge1, float x)

 float value = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
 return value * value * (3.0f - 2.0f * value);

Example of usage:

static inline float smoothstep(float edge0, float edge1, float x)

 float value = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
 return value * value * (3.0f - 2.0f * value);


uchar4 RS_KERNEL root(uint32_t x, uint32_t y)

 ....
 float mask = btex.r;
 float maskValue = smoothstep(0.3f, 0.5f, mask);
 float4 ress = (float4)maskValue, maskValue, maskValue, 1.0f;
 ....

And next a link about how smoothstep internally works, in case you have any other doubts:

smoothstep

Enjoy

share|improve this answer

edited Mar 27 at 21:11

answered Mar 27 at 19:29

PerracoLabsPerracoLabs

5,06988 gold badges4141 silver badges7878 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  However ,in the following links they do mention about smoothstep functions.. May be they are not currently implemented in rs
  
  – user3177661
  Mar 27 at 19:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The link in the answer is not related to RenderScript, is just a link about information about how the general smoothstep function works, in case you want to write your own function. And as stated in the answer, RenderScript doesn't have a smoothstep function, so you can use the one I put in the answer, which is a smoothstep function written 100% in RenderScript.
  
  – PerracoLabs
  Mar 27 at 21:06
  
  

  
  
  
  

add a comment | 

1

RenderScript doesn't have a buit-in smoothstep function, so the simplest thing is to implement it yourself. Next the source ready to be used in your scripts:

static inline float smoothstep(float edge0, float edge1, float x)

 float value = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
 return value * value * (3.0f - 2.0f * value);

Example of usage:

static inline float smoothstep(float edge0, float edge1, float x)

 float value = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
 return value * value * (3.0f - 2.0f * value);


uchar4 RS_KERNEL root(uint32_t x, uint32_t y)

 ....
 float mask = btex.r;
 float maskValue = smoothstep(0.3f, 0.5f, mask);
 float4 ress = (float4)maskValue, maskValue, maskValue, 1.0f;
 ....

And next a link about how smoothstep internally works, in case you have any other doubts:

smoothstep

Enjoy

share|improve this answer

edited Mar 27 at 21:11

answered Mar 27 at 19:29

PerracoLabsPerracoLabs

5,06988 gold badges4141 silver badges7878 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  However ,in the following links they do mention about smoothstep functions.. May be they are not currently implemented in rs
  
  – user3177661
  Mar 27 at 19:44
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The link in the answer is not related to RenderScript, is just a link about information about how the general smoothstep function works, in case you want to write your own function. And as stated in the answer, RenderScript doesn't have a smoothstep function, so you can use the one I put in the answer, which is a smoothstep function written 100% in RenderScript.
  
  – PerracoLabs
  Mar 27 at 21:06
  
  

  
  
  
  

add a comment | 

RenderScript doesn't have a buit-in smoothstep function, so the simplest thing is to implement it yourself. Next the source ready to be used in your scripts:

static inline float smoothstep(float edge0, float edge1, float x)

 float value = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
 return value * value * (3.0f - 2.0f * value);

Example of usage:

static inline float smoothstep(float edge0, float edge1, float x)

 float value = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
 return value * value * (3.0f - 2.0f * value);


uchar4 RS_KERNEL root(uint32_t x, uint32_t y)

 ....
 float mask = btex.r;
 float maskValue = smoothstep(0.3f, 0.5f, mask);
 float4 ress = (float4)maskValue, maskValue, maskValue, 1.0f;
 ....

And next a link about how smoothstep internally works, in case you have any other doubts:

smoothstep

Enjoy

share|improve this answer

edited Mar 27 at 21:11

answered Mar 27 at 19:29

PerracoLabsPerracoLabs

5,06988 gold badges4141 silver badges7878 bronze badges

static inline float smoothstep(float edge0, float edge1, float x)

 float value = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
 return value * value * (3.0f - 2.0f * value);

static inline float smoothstep(float edge0, float edge1, float x)

 float value = clamp((x - edge0) / (edge1 - edge0), 0.0f, 1.0f);
 return value * value * (3.0f - 2.0f * value);


uchar4 RS_KERNEL root(uint32_t x, uint32_t y)

 ....
 float mask = btex.r;
 float maskValue = smoothstep(0.3f, 0.5f, mask);
 float4 ress = (float4)maskValue, maskValue, maskValue, 1.0f;
 ....

share|improve this answer

edited Mar 27 at 21:11

answered Mar 27 at 19:29

PerracoLabsPerracoLabs

5,06988 gold badges4141 silver badges7878 bronze badges

answered Mar 27 at 19:29

PerracoLabsPerracoLabs

5,06988 gold badges4141 silver badges7878 bronze badges

answered Mar 27 at 19:29

PerracoLabsPerracoLabs

5,06988 gold badges4141 silver badges7878 bronze badges