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Clear either 8 or 16-bit stencil buffers.

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This commit is contained in:
Brian Paul
2005-09-13 02:03:06 +00:00
parent b5932cfc9d
commit 56a2e084be
1 changed files with 66 additions and 27 deletions
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src/mesa/swrast/s_stencil.c
+66 -27
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@@ -1,6 +1,6 @@
/*
* Mesa 3-D graphics library
* Version: 6.3
* Version: 6.5
*
* Copyright (C) 1999-2005 Brian Paul All Rights Reserved.
*
@@ -1123,15 +1123,19 @@ _swrast_write_stencil_span(GLcontext *ctx, GLint n, GLint x, GLint y,
void
_swrast_clear_stencil_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
{
const GLstencil mask = ctx->Stencil.WriteMask[0];
const GLstencil invMask = ~mask;
const GLstencil clearVal = (ctx->Stencil.Clear & mask);
const GLubyte stencilBits = rb->ComponentSizes[0];
const GLuint mask = ctx->Stencil.WriteMask[0];
const GLuint invMask = ~mask;
const GLuint clearVal = (ctx->Stencil.Clear & mask);
const GLuint stencilMax = (1 << stencilBits) - 1;
GLint x, y, width, height;
if (!rb || mask == 0)
return;
ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
ASSERT(rb->DataType == GL_UNSIGNED_BYTE ||
rb->DataType == GL_UNSIGNED_SHORT);
ASSERT(rb->_BaseFormat == GL_STENCIL_INDEX);
/* compute region to clear */
@@ -1142,13 +1146,24 @@ _swrast_clear_stencil_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
if (rb->GetPointer(ctx, rb, 0, 0)) {
/* Direct buffer access */
if (ctx->Stencil.WriteMask[0] != STENCIL_MAX) {
if ((mask & stencilMax) != stencilMax) {
/* need to mask the clear */
GLint i, j;
for (i = 0; i < height; i++) {
GLubyte *stencil = rb->GetPointer(ctx, rb, x, y + i);
for (j = 0; j < width; j++) {
stencil[j] = (stencil[j] & invMask) | clearVal;
if (rb->DataType == GL_UNSIGNED_BYTE) {
GLint i, j;
for (i = 0; i < height; i++) {
GLubyte *stencil = rb->GetPointer(ctx, rb, x, y + i);
for (j = 0; j < width; j++) {
stencil[j] = (stencil[j] & invMask) | clearVal;
}
}
}
else {
GLint i, j;
for (i = 0; i < height; i++) {
GLushort *stencil = rb->GetPointer(ctx, rb, x, y + i);
for (j = 0; j < width; j++) {
stencil[j] = (stencil[j] & invMask) | clearVal;
}
}
}
}
@@ -1157,17 +1172,21 @@ _swrast_clear_stencil_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
if (width == rb->Width &&
rb->InternalFormat == GL_STENCIL_INDEX8_EXT) {
/* optimized case */
/* XXX bottom-to-op raster assumed! */
GLubyte *stencil = rb->GetPointer(ctx, rb, x, y);
GLuint len = width * height * sizeof(GLubyte);
_mesa_memset(stencil, clearVal, len);
}
else {
/* general case */
GLint i, j;
GLint i;
for (i = 0; i < height; i++) {
GLubyte *stencil = rb->GetPointer(ctx, rb, x, y + i);
for (j = 0; j < width; j++) {
stencil[j] = clearVal;
GLvoid *stencil = rb->GetPointer(ctx, rb, x, y + i);
if (rb->DataType == GL_UNSIGNED_BYTE) {
_mesa_memset(stencil, clearVal, width);
}
else {
_mesa_memset16(stencil, clearVal, width);
}
}
}
@@ -1175,26 +1194,46 @@ _swrast_clear_stencil_buffer( GLcontext *ctx, struct gl_renderbuffer *rb )
}
else {
/* no direct access */
if (ctx->Stencil.WriteMask[0] != STENCIL_MAX) {
if ((mask & stencilMax) != stencilMax) {
/* need to mask the clear */
GLint i, j;
for (i = 0; i < height; i++) {
GLubyte stencil[MAX_WIDTH];
rb->GetRow(ctx, rb, width, x, y + i, stencil);
for (j = 0; j < width; j++) {
stencil[j] = (stencil[j] & invMask) | clearVal;
if (rb->DataType == GL_UNSIGNED_BYTE) {
GLint i, j;
for (i = 0; i < height; i++) {
GLubyte stencil[MAX_WIDTH];
rb->GetRow(ctx, rb, width, x, y + i, stencil);
for (j = 0; j < width; j++) {
stencil[j] = (stencil[j] & invMask) | clearVal;
}
rb->PutRow(ctx, rb, width, x, y + i, stencil, NULL);
}
}
else {
GLint i, j;
for (i = 0; i < height; i++) {
GLushort stencil[MAX_WIDTH];
rb->GetRow(ctx, rb, width, x, y + i, stencil);
for (j = 0; j < width; j++) {
stencil[j] = (stencil[j] & invMask) | clearVal;
}
rb->PutRow(ctx, rb, width, x, y + i, stencil, NULL);
}
rb->PutRow(ctx, rb, width, x, y + i, stencil, NULL);
}
}
else {
/* no bit masking */
const GLubyte clear8 = clearVal;
const GLubyte clear8 = (GLubyte) clearVal;
const GLushort clear16 = (GLushort) clearVal;
const void *clear;
GLint i;
if (rb->DataType == GL_UNSIGNED_BYTE) {
clear = &clear8;
}
else {
clear = &clear16;
}
for (i = 0; i < height; i++) {
rb->PutMonoRow(ctx, rb, width, x, y + i, &clear8, NULL);
}
rb->PutMonoRow(ctx, rb, width, x, y + i, clear, NULL);
}
}
}
}