Condense variable-creation functions in GrGLProgramStage, use new addUniform() API there

At last, a net negative lines-of-code change!

[bsalomon, 2012-05-30 18:10:25]

On 2012/05/30 17:50:00, TomH wrote:

LGTM, let's keep making more of this automatic for the effects:

* Auto-append stage
* Auto-prepend Hungarian notation (if we decide to keep this)
* Let the caller give a single name for the varying, the builder generates the
fs and vs names automatically.

[bsalomon, 2012-05-30 18:11:48]

On 2012/05/30 18:10:25, bsalomon wrote:
> On 2012/05/30 17:50:00, TomH wrote:
> 
> LGTM, let's keep making more of this automatic for the effects:
> 
> * Auto-append stage
> * Auto-prepend Hungarian notation (if we decide to keep this)
> * Let the caller give a single name for the varying, the builder generates the
> fs and vs names automatically.

Maybe it should be called "emitGlobalVariables"?

[TomH, 2012-05-30 18:27:43]

Closed with r4083 (after a couple more tweaks discussed verbally).

On 2012/05/30 18:11:48, bsalomon wrote:
> Maybe it should be called "emitGlobalVariables"?

Didn't do this yet because I'm not quite happy with 'emit' here; it seems
qualitatively different from the emitFS()/emitVS() functions which do literally
output code. Here we're setting up structs which glue will later read to drive
an emit.