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invert Y axis with the viewport transformation to put things right side up

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Brian 2007-08-09 17:59:13 -06:00
parent 584c076201
commit f1637e89de
1 changed files with 14 additions and 1 deletions
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15
src/mesa/pipe/i915simple/i915_state.c
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@ -189,11 +189,24 @@ static void i915_set_viewport_state( struct pipe_context *pipe,
const struct pipe_viewport_state *viewport )
{
struct i915_context *i915 = i915_context(pipe);
float sy, ty;
i915->viewport = *viewport; /* struct copy */
/* Negate Y scale to flip image vertically.
* The NDC Y coords prior to viewport transformation are in the range
* [y=-1=bottom, y=1=top]
* Intel window coords are in the range [y=0=top, y=H-1=bottom] where H
* is the window height.
* Use the viewport transformation to invert Y.
*/
sy = viewport->scale[1];
ty = viewport->translate[1];
i915->viewport.scale[1] = -sy;
i915->viewport.translate[1] = i915->framebuffer.cbufs[0]->height - ty;
/* pass the viewport info to the draw module */
draw_set_viewport_state(i915->draw, viewport);
draw_set_viewport_state(i915->draw, &i915->viewport);
/* Using tnl/ and vf/ modules is temporary while getting started.
* Full pipe will have vertex shader, vertex fetch of its own.