MESA GLSL Notes (<3)

glsl-fail.glsl

GLSL IR for linked vertex program 172:
(
(declare (location=0 shader_out ) vec4 gl_Position)
(declare (uniform ) vec4 ua)
(declare (uniform ) vec4 ub)
( function main
  (signature void
    (parameters
    )
    (
      (declare (temporary ) vec4 vec_ctor)
      (declare (temporary ) float cse)
      (assign  (x) (var_ref cse)  (expression float + (swiz x (var_ref ua) )(swiz x (var_ref ub) )) ) 
      (declare (temporary ) bool cse@192)
      (assign  (x) (var_ref cse@192)  (expression bool > (swiz x (var_ref ua) )(constant float (0.000000)) ) ) 
      (assign  (x) (var_ref vec_ctor)  (expression float csel (var_ref cse@192) (var_ref cse) (expression float csel (var_ref cse@192) (var_ref cse) (var_ref cse) ) ) ) 
      (declare (temporary ) float cse@193)
      (assign  (x) (var_ref cse@193)  (expression float + (swiz y (var_ref ua) )(swiz y (var_ref ub) )) ) 
      (declare (temporary ) bool cse@194)
      (assign  (x) (var_ref cse@194)  (expression bool > (swiz y (var_ref ua) )(constant float (0.000000)) ) ) 
      (assign  (y) (var_ref vec_ctor)  (expression float csel (var_ref cse@194) (var_ref cse@193) (expression float csel (var_ref cse@194) (var_ref cse@193) (var_ref cse@193) ) ) ) 
      (declare (temporary ) float cse@195)
      (assign  (x) (var_ref cse@195)  (expression float + (swiz z (var_ref ua) )(swiz z (var_ref ub) )) ) 
      (declare (temporary ) bool cse@196)
      (assign  (x) (var_ref cse@196)  (expression bool > (swiz z (var_ref ua) )(constant float (0.000000)) ) ) 
      (assign  (z) (var_ref vec_ctor)  (expression float csel (var_ref cse@196) (var_ref cse@195) (expression float csel (var_ref cse@196) (var_ref cse@195) (var_ref cse@195) ) ) ) 
      (declare (temporary ) float cse@197)
      (assign  (x) (var_ref cse@197)  (expression float + (swiz w (var_ref ua) )(swiz w (var_ref ub) )) ) 
      (declare (temporary ) bool cse@198)
      (assign  (x) (var_ref cse@198)  (expression bool > (swiz w (var_ref ua) )(constant float (0.000000)) ) ) 
      (assign  (w) (var_ref vec_ctor)  (expression float csel (var_ref cse@198) (var_ref cse@197) (expression float csel (var_ref cse@198) (var_ref cse@197) (var_ref cse@197) ) ) ) 
      (declare (temporary ) vec4 vec_ctor@199)
      (assign  (yzw) (var_ref vec_ctor@199)  (constant vec3 (0.000000 0.000000 0.000000)) ) 
      (assign  (x) (var_ref vec_ctor@199)  (swiz x (var_ref vec_ctor) )) 
      (assign  (xyzw) (var_ref gl_Position)  (var_ref vec_ctor@199) ) 
    ))

)

)

GLSL vertex shader 0 source for linked program 172:
// Ran with MESA_GLSL=dump, "Mesa 11.0.0-devel (git-1bba29e) is supported"

#version 130


uniform vec4 ua;
uniform vec4 ub;

float add(float a, float b) { 
	float c = mix(a + b, a + b, a > 0.0);
	return mix(c, a + b,  a > 0.0); // *Cough* a + b *cough*
}

vec4 add4(vec4 va, vec4 vb) {
 return vec4(add(va.x,vb.x),
             add(va.y,vb.y),
             add(va.z,vb.z),
             add(va.w,vb.w));
}

void main()
{
	gl_Position  = vec4(add4(ua,ub).x,0.0,0.0,0.0);
}

glsl-win.glsl

GLSL IR for linked vertex program 176:
(
(declare (location=0 shader_out ) vec4 gl_Position)
(declare (uniform ) vec4 ua)
(declare (uniform ) vec4 ub)
( function main
  (signature void
    (parameters
    )
    (
      (declare (temporary ) vec4 vec_ctor)
      (assign  (yzw) (var_ref vec_ctor)  (constant vec3 (0.000000 0.000000 0.000000)) ) 
      (assign  (x) (var_ref vec_ctor)  (swiz x (expression vec4 + (var_ref ua) (var_ref ub) ) )) 
      (assign  (xyzw) (var_ref gl_Position)  (var_ref vec_ctor) ) 
    ))

)

)

GLSL vertex shader 0 source for linked program 176:
// Ran with MESA_GLSL=dump, "Mesa 11.0.0-devel (git-1bba29e) is supported"

#version 130


uniform vec4 ua;
uniform vec4 ub;

float add(float a, float b) { 
	return a + b;
}

vec4 add4(vec4 va, vec4 vb) {
 return vec4(add(va.x,vb.x),
             add(va.y,vb.y),
             add(va.z,vb.z),
             add(va.w,vb.w));
}

void main()
{
	gl_Position  = vec4(add4(ua,ub).x,0.0,0.0,0.0);
}