scissor.h File Reference

#include "types.h"

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Functions
void	gl_Scissor (GLcontext *ctx, GLint x, GLint y, GLsizei width, GLsizei height)
GLint	gl_scissor_span (GLcontext *ctx, GLuint n, GLint x, GLint y, GLubyte mask[])
GLuint	gl_scissor_pixels (GLcontext *ctx, GLuint n, const GLint x[], const GLint y[], GLubyte mask[])

Function Documentation

gl_Scissor()

void gl_Scissor	(	GLcontext *	ctx,
		GLint	x,
		GLint	y,
		GLsizei	width,
		GLsizei	height
	)

Definition at line 58 of file scissor.c.

{
   if (width<0 || height<0) {
      gl_error( ctx, GL_INVALID_VALUE, "glScissor" );
      return;
   }
   if (INSIDE_BEGIN_END(ctx)) {
      gl_error( ctx, GL_INVALID_OPERATION, "glBegin" );
      return;
   }

   if (x!=ctx->Scissor.X || y!=ctx->Scissor.Y || 
       width!=ctx->Scissor.Width || height!=ctx->Scissor.Height) {
      ctx->Scissor.X = x;
      ctx->Scissor.Y = y;
      ctx->Scissor.Width = width;
      ctx->Scissor.Height = height;
      ctx->NewState |= NEW_ALL;  /* TODO: this is overkill */
   }
}

Referenced by execute_list(), and init_exec_pointers().

gl_scissor_pixels()

GLuint gl_scissor_pixels	(	GLcontext *	ctx,
		GLuint	n,
		const GLint	x[],
		const GLint	y[],
		GLubyte	mask[]
	)

Definition at line 116 of file scissor.c.

{
   GLint xmin = ctx->Buffer->Xmin;
   GLint xmax = ctx->Buffer->Xmax;
   GLint ymin = ctx->Buffer->Ymin;
   GLint ymax = ctx->Buffer->Ymax;
   GLuint i;

   for (i=0;i<n;i++) {
      mask[i] &= (x[i]>=xmin) & (x[i]<=xmax) & (y[i]>=ymin) & (y[i]<=ymax);
   }

   return 1;
}

gl_scissor_span()

GLint gl_scissor_span	(	GLcontext *	ctx,
		GLuint	n,
		GLint	x,
		GLint	y,
		GLubyte	mask[]
	)

Definition at line 87 of file scissor.c.

{
   /* first check if whole span is outside the scissor box */
   if (y<ctx->Buffer->Ymin || y>ctx->Buffer->Ymax
       || x>ctx->Buffer->Xmax || x+(GLint)n-1<ctx->Buffer->Xmin) {
      return 0;
   }
   else {
      GLint i;
      GLint xMin = ctx->Buffer->Xmin;
      GLint xMax = ctx->Buffer->Xmax;
      for (i=0; x+i < xMin; i++) {
         mask[i] = 0;
      }
      for (i=(GLint)n-1; x+i > xMax; i--) {
         mask[i] = 0;
      }

      return 1;
   }
}

Referenced by gl_write_color_span(), gl_write_index_span(), gl_write_monocolor_span(), gl_write_monoindex_span(), and gl_write_texture_span().