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POsamplerBuffer in texelFetch()
 

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  1. POsamplerBuffer in texelFetch()
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    <p>Frag shader:</p> <pre><code>out vec4 Color; uniform samplerBuffer sampler; uniform int index; void main() { Color=normalize(texelFetch(sampler,index)); } </code></pre> <p>I am using glTexBuffer() for texturing for all the internal formats given at <a href="http://www.opengl.org/sdk/docs/man3/xhtml/glTexBuffer.xml" rel="nofollow">http://www.opengl.org/sdk/docs/man3/xhtml/glTexBuffer.xml</a>. Above shader works only for ubyte, ushort normalised types and float, halffloat unnormalised types. For the rest of the internal formats, it does not apply texture on geometry.</p> <p>What do I need to change to give me the desired effect?</p> <p>code</p> <pre><code>GLbyte arr[]={124,5,126}; glGenBuffers(1,&amp;bufferid); glBindBuffer(GL_TEXTURE_BUFFER,bufferid); glBufferData(GL_TEXTURE_BUFFER,sizeof(arr),arr,GL_STATIC_DRAW); glGenTextures(1, &amp;buffer_texture); glBindTexture(GL_TEXTURE_BUFFER, buffer_texture); glTexBuffer(GL_TEXTURE_BUFFER, GL_R8I, bufferid); glUniform1i(glGetUniformLocation(shader_data.psId,"sampler"),0); glUniform1i(glGetUniformLocation(shader_data.psId,"index"),0); glGenBuffers(1,&amp;bufferid1); glBindBuffer(GL_ARRAY_BUFFER,bufferid1); glBufferData(GL_ARRAY_BUFFER,sizeof(vertices4),vertices4,GL_STATIC_DRAW); attr_vertex = glGetAttribLocation(shader_data.psId, "a_position"); glVertexAttribPointer(attr_vertex, 2 , GL_FLOAT, GL_FALSE ,0, 0); glEnableVertexAttribArray(attr_vertex); glDrawArrays(GL_TRIANGLE_FAN,0,4); glUniform1i(glGetUniformLocation(shader_data.psId,"index"),1); glVertexAttribPointer(attr_vertex, 2 , GL_FLOAT, GL_FALSE ,0,(void *)(32) ); glDrawArrays(GL_TRIANGLE_FAN,0,4); glUniform1i(glGetUniformLocation(shader_data.psId,"index"),2); glVertexAttribPointer(attr_vertex, 2 , GL_FLOAT, GL_FALSE ,0,(void *)(64) ); glDrawArrays(GL_TRIANGLE_FAN,0,4); </code></pre> <p>I have to apply texture using all the internal formats.</p>
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