st_atom_scissor.c File Reference

Include dependency graph for st_atom_scissor.c:

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Functions
static void	update_scissor (struct st_context *st)
	Scissor depends on the scissor box, and the framebuffer dimensions.
Variables
struct st_tracked_state	st_update_scissor

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Function Documentation

static void update_scissor

(

struct st_context *

st

)

[static]

Scissor depends on the scissor box, and the framebuffer dimensions.

Definition at line 43 of file st_atom_scissor.c.

References st_context::ctx, pipe_scissor_state::maxx, pipe_scissor_state::maxy, pipe_scissor_state::minx, pipe_scissor_state::miny, st_context::pipe, st_context::scissor, pipe_context::set_scissor_state, and st_context::state.

{
   struct pipe_scissor_state scissor;
   const struct gl_framebuffer *fb = st->ctx->DrawBuffer;
   GLint miny, maxy;

   scissor.minx = 0;
   scissor.miny = 0;
   scissor.maxx = fb->Width;
   scissor.maxy = fb->Height;

   if (st->ctx->Scissor.Enabled) {
      if ((GLuint)st->ctx->Scissor.X > scissor.minx)
         scissor.minx = st->ctx->Scissor.X;
      if ((GLuint)st->ctx->Scissor.Y > scissor.miny)
         scissor.miny = st->ctx->Scissor.Y;

      if ((GLuint)st->ctx->Scissor.X + st->ctx->Scissor.Width < scissor.maxx)
         scissor.maxx = st->ctx->Scissor.X + st->ctx->Scissor.Width;
      if ((GLuint)st->ctx->Scissor.Y + st->ctx->Scissor.Height < scissor.maxy)
         scissor.maxy = st->ctx->Scissor.Y + st->ctx->Scissor.Height;

      /* check for null space */
      if (scissor.minx >= scissor.maxx || scissor.miny >= scissor.maxy)
         scissor.minx = scissor.miny = scissor.maxx = scissor.maxy = 0;
   }

   /* Now invert Y.  Pipe drivers use the convention Y=0=top for surfaces
    */
   miny = fb->Height - scissor.maxy;
   maxy = fb->Height - scissor.miny;
   scissor.miny = miny;
   scissor.maxy = maxy;

   if (memcmp(&scissor, &st->state.scissor, sizeof(scissor)) != 0) {
      /* state has changed */
      st->state.scissor = scissor;  /* struct copy */
      st->pipe->set_scissor_state(st->pipe, &scissor); /* activate */
   }
}

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Variable Documentation

struct st_tracked_state st_update_scissor

Initial value:

 {
   "st_update_scissor",                                 
   {                                                    
      (_NEW_SCISSOR | _NEW_BUFFERS),                    
      0,                                                
   },
   update_scissor                                       
}

Definition at line 85 of file st_atom_scissor.c.

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