st_atom_viewport.c File Reference

Include dependency graph for st_atom_viewport.c:

Go to the source code of this file.

Functions
static void	update_viewport (struct st_context *st)
	Update the viewport transformation matrix.
Variables
struct st_tracked_state	st_update_viewport

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Function Documentation

static void update_viewport

(

struct st_context *

st

)

[static]

Update the viewport transformation matrix.

Depends on:

• viewport pos/size
• depthrange
• window pos/size or FBO size

Definition at line 43 of file st_atom_viewport.c.

References st_context::cso_context, cso_set_viewport(), st_context::ctx, pipe_viewport_state::scale, st_fb_orientation(), st_context::state, pipe_viewport_state::translate, st_context::viewport, and Y_0_TOP.

{
   GLcontext *ctx = st->ctx;
   GLfloat yScale, yBias;

   /* _NEW_BUFFERS
    */
   if (st_fb_orientation(ctx->DrawBuffer) == Y_0_TOP) {
      yScale = -1;
      yBias = (GLfloat)ctx->DrawBuffer->Height;
   }
   else {
      yScale = 1.0;
      yBias = 0.0;
   }

   /* _NEW_VIEWPORT 
    */
   {
      GLfloat x = (GLfloat)ctx->Viewport.X;
      GLfloat y = (GLfloat)ctx->Viewport.Y;
      GLfloat z = ctx->Viewport.Near;
      GLfloat half_width = (GLfloat)ctx->Viewport.Width / 2.0f;
      GLfloat half_height = (GLfloat)ctx->Viewport.Height / 2.0f;
      GLfloat half_depth = (GLfloat)(ctx->Viewport.Far - ctx->Viewport.Near) / 2.0f;
      
      st->state.viewport.scale[0] = half_width;
      st->state.viewport.scale[1] = half_height * yScale;
      st->state.viewport.scale[2] = half_depth;
      st->state.viewport.scale[3] = 1.0;

      st->state.viewport.translate[0] = half_width + x;
      st->state.viewport.translate[1] = (half_height + y) * yScale + yBias;
      st->state.viewport.translate[2] = half_depth + z;
      st->state.viewport.translate[3] = 0.0;

      cso_set_viewport(st->cso_context, &st->state.viewport);
   }
}

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Variable Documentation

struct st_tracked_state st_update_viewport

Initial value:

 {
   "st_update_viewport",                                
   {                                                    
      _NEW_BUFFERS | _NEW_VIEWPORT,                     
      0,                                                
   },
   update_viewport                                      
}

Definition at line 84 of file st_atom_viewport.c.

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