-/* $Id: stencil.c,v 1.12 1999/12/10 16:15:04 brianp Exp $ */
+/* $Id: stencil.c,v 1.16 2000/04/11 21:26:57 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.3
*
- * Copyright (C) 1999 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
#else
#include "glheader.h"
#include "context.h"
+#include "depth.h"
#include "mem.h"
#include "pb.h"
#include "stencil.h"
*
*/
static GLboolean
-stencil_and_depth_test_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
- const GLdepth z[], GLstencil stencil[],
- GLubyte mask[] )
+stencil_and_ztest_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
+ const GLdepth z[], GLstencil stencil[],
+ GLubyte mask[] )
{
ASSERT(ctx->Stencil.Enabled);
ASSERT(n <= PB_SIZE);
MEMCPY(oldmask, mask, n * sizeof(GLubyte));
/* apply the depth test */
- if (ctx->Driver.DepthTestSpan)
- (*ctx->Driver.DepthTestSpan)( ctx, n, x, y, z, mask );
+ _mesa_depth_test_span(ctx, n, x, y, z, mask);
/* Set the stencil pass/fail flags according to result of depth testing.
* if oldmask[i] == 0 then
*
*/
GLboolean
-gl_stencil_and_depth_test_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
- const GLdepth z[], GLubyte mask[] )
+_mesa_stencil_and_ztest_span( GLcontext *ctx, GLuint n, GLint x, GLint y,
+ const GLdepth z[], GLubyte mask[] )
{
GLstencil stencilRow[MAX_WIDTH];
GLstencil *stencil;
}
/* do all the stencil/depth testing/updating */
- result = stencil_and_depth_test_span( ctx, n, x, y, z, stencil, mask );
+ result = stencil_and_ztest_span( ctx, n, x, y, z, stencil, mask );
if (ctx->Driver.WriteStencilSpan) {
/* Write updated stencil values into hardware stencil buffer */
* This is used both for software and hardware stencil buffers.
*
* The comments in this function are a bit sparse but the code is
- * almost identical to stencil_and_depth_test_span(), which is well
+ * almost identical to stencil_and_ztest_span(), which is well
* commented.
*
* Input: n - number of pixels in the array
* GL_FALSE - one or more fragments passed the testing
*/
GLboolean
-gl_stencil_and_depth_test_pixels( GLcontext *ctx,
- GLuint n, const GLint x[], const GLint y[],
- const GLdepth z[], GLubyte mask[] )
+_mesa_stencil_and_ztest_pixels( GLcontext *ctx,
+ GLuint n, const GLint x[], const GLint y[],
+ const GLdepth z[], GLubyte mask[] )
{
ASSERT(ctx->Stencil.Enabled);
ASSERT(n <= PB_SIZE);
MEMCPY(oldmask, mask, n * sizeof(GLubyte));
- if (ctx->Driver.DepthTestPixels)
- (*ctx->Driver.DepthTestPixels)( ctx, n, x, y, z, mask );
+ _mesa_depth_test_pixels(ctx, n, x, y, z, mask);
for (i=0;i<n;i++) {
ASSERT(mask[i] == 0 || mask[i] == 1);
MEMCPY(oldmask, mask, n * sizeof(GLubyte));
- if (ctx->Driver.DepthTestPixels)
- (*ctx->Driver.DepthTestPixels)( ctx, n, x, y, z, mask );
+ _mesa_depth_test_pixels(ctx, n, x, y, z, mask);
for (i=0;i<n;i++) {
ASSERT(mask[i] == 0 || mask[i] == 1);
* x,y - location of first pixel
* Output: stencil - the array of stencil values
*/
-void gl_read_stencil_span( GLcontext *ctx,
- GLint n, GLint x, GLint y, GLstencil stencil[] )
+void
+_mesa_read_stencil_span( GLcontext *ctx,
+ GLint n, GLint x, GLint y, GLstencil stencil[] )
{
+ if (y < 0 || y >= ctx->DrawBuffer->Height ||
+ x + n <= 0 || x >= ctx->DrawBuffer->Width) {
+ /* span is completely outside framebuffer */
+ return; /* undefined values OK */
+ }
+
+ if (x < 0) {
+ GLint dx = -x;
+ x = 0;
+ n -= dx;
+ stencil += dx;
+ }
+ if (x + n > ctx->DrawBuffer->Width) {
+ GLint dx = x + n - ctx->DrawBuffer->Width;
+ n -= dx;
+ }
+ if (n <= 0) {
+ return;
+ }
+
+
ASSERT(n >= 0);
- if (ctx->DrawBuffer->Stencil) {
- if (ctx->Driver.ReadStencilSpan) {
- (*ctx->Driver.ReadStencilSpan)( ctx, (GLuint) n, x, y, stencil );
- }
- else {
- const GLstencil *s = STENCIL_ADDRESS( x, y );
+ if (ctx->Driver.ReadStencilSpan) {
+ (*ctx->Driver.ReadStencilSpan)( ctx, (GLuint) n, x, y, stencil );
+ }
+ else if (ctx->DrawBuffer->Stencil) {
+ const GLstencil *s = STENCIL_ADDRESS( x, y );
#if STENCIL_BITS == 8
- MEMCPY( stencil, s, n * sizeof(GLstencil) );
+ MEMCPY( stencil, s, n * sizeof(GLstencil) );
#else
- GLuint i;
- for (i=0;i<n;i++)
- stencil[i] = s[i];
+ GLuint i;
+ for (i=0;i<n;i++)
+ stencil[i] = s[i];
#endif
- }
}
}
* x, y - location of first pixel
* stencil - the array of stencil values
*/
-void gl_write_stencil_span( GLcontext *ctx,
- GLint n, GLint x, GLint y,
- const GLstencil stencil[] )
+void
+_mesa_write_stencil_span( GLcontext *ctx, GLint n, GLint x, GLint y,
+ const GLstencil stencil[] )
{
- ASSERT(n >= 0);
- if (ctx->DrawBuffer->Stencil) {
- /* do clipping */
- if (y < ctx->DrawBuffer->Ymin || y > ctx->DrawBuffer->Ymax)
- return;
- if (x < ctx->DrawBuffer->Xmin) {
- GLint diff = ctx->DrawBuffer->Xmin - x;
- n -= diff;
- stencil += diff;
- x = ctx->DrawBuffer->Xmin;
- }
- if (x + n > ctx->DrawBuffer->Xmax) {
- GLint diff = x + n - ctx->DrawBuffer->Xmax;
- n -= diff;
- }
+ if (y < 0 || y >= ctx->DrawBuffer->Height ||
+ x + n <= 0 || x >= ctx->DrawBuffer->Width) {
+ /* span is completely outside framebuffer */
+ return; /* undefined values OK */
+ }
- ASSERT( n >= 0);
+ if (x < 0) {
+ GLint dx = -x;
+ x = 0;
+ n -= dx;
+ stencil += dx;
+ }
+ if (x + n > ctx->DrawBuffer->Width) {
+ GLint dx = x + n - ctx->DrawBuffer->Width;
+ n -= dx;
+ }
+ if (n <= 0) {
+ return;
+ }
- if (ctx->Driver.WriteStencilSpan) {
- (*ctx->Driver.WriteStencilSpan)( ctx, n, x, y, stencil, NULL );
- }
- else {
- GLstencil *s = STENCIL_ADDRESS( x, y );
+ if (ctx->Driver.WriteStencilSpan) {
+ (*ctx->Driver.WriteStencilSpan)( ctx, n, x, y, stencil, NULL );
+ }
+ else if (ctx->DrawBuffer->Stencil) {
+ GLstencil *s = STENCIL_ADDRESS( x, y );
#if STENCIL_BITS == 8
- MEMCPY( s, stencil, n * sizeof(GLstencil) );
+ MEMCPY( s, stencil, n * sizeof(GLstencil) );
#else
- GLuint i;
- for (i=0;i<n;i++)
- s[i] = stencil[i];
+ GLuint i;
+ for (i=0;i<n;i++)
+ s[i] = stencil[i];
#endif
- }
}
}
* Allocate a new stencil buffer. If there's an old one it will be
* deallocated first. The new stencil buffer will be uninitialized.
*/
-void gl_alloc_stencil_buffer( GLcontext *ctx )
+void
+_mesa_alloc_stencil_buffer( GLcontext *ctx )
{
GLuint buffersize = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height;
if (!ctx->DrawBuffer->Stencil) {
/* out of memory */
_mesa_set_enable( ctx, GL_STENCIL_TEST, GL_FALSE );
- gl_error( ctx, GL_OUT_OF_MEMORY, "gl_alloc_stencil_buffer" );
+ gl_error( ctx, GL_OUT_OF_MEMORY, "_mesa_alloc_stencil_buffer" );
}
}
/*
* Clear the stencil buffer.
*/
-void gl_clear_stencil_buffer( GLcontext *ctx )
+void
+_mesa_clear_stencil_buffer( GLcontext *ctx )
{
if (ctx->Driver.WriteStencilSpan) {
ASSERT(ctx->Driver.ReadStencilSpan);
projects / mesa.git / blobdiff