From 724abeb058ca9372c5a9b9e38ee43dde1accaa41 Mon Sep 17 00:00:00 2001 From: Keith Whitwell Date: Tue, 31 Oct 2000 18:09:44 +0000 Subject: Moved the software rasterizer to a new directory. --- src/mesa/main/stencil.c | 1268 +---------------------------------------------- 1 file changed, 1 insertion(+), 1267 deletions(-) (limited to 'src/mesa/main/stencil.c') diff --git a/src/mesa/main/stencil.c b/src/mesa/main/stencil.c index 2dcecced56..93a8303492 100644 --- a/src/mesa/main/stencil.c +++ b/src/mesa/main/stencil.c @@ -1,4 +1,4 @@ -/* $Id: stencil.c,v 1.21 2000/10/30 13:32:01 keithw Exp $ */ +/* $Id: stencil.c,v 1.22 2000/10/31 18:09:45 keithw Exp $ */ /* * Mesa 3-D graphics library @@ -33,7 +33,6 @@ #include "depth.h" #include "macros.h" #include "mem.h" -#include "pb.h" #include "stencil.h" #include "types.h" #include "enable.h" @@ -181,1268 +180,3 @@ _mesa_StencilOp(GLenum fail, GLenum zfail, GLenum zpass) } } - - -/* Stencil Logic: - -IF stencil test fails THEN - Apply fail-op to stencil value - Don't write the pixel (RGBA,Z) -ELSE - IF doing depth test && depth test fails THEN - Apply zfail-op to stencil value - Write RGBA and Z to appropriate buffers - ELSE - Apply zpass-op to stencil value -ENDIF - -*/ - - - - -/* - * Return the address of a stencil buffer value given the window coords: - */ -#define STENCIL_ADDRESS(X,Y) \ - (ctx->DrawBuffer->Stencil + ctx->DrawBuffer->Width * (Y) + (X)) - - - -/* - * Apply the given stencil operator to the array of stencil values. - * Don't touch stencil[i] if mask[i] is zero. - * Input: n - size of stencil array - * oper - the stencil buffer operator - * stencil - array of stencil values - * mask - array [n] of flag: 1=apply operator, 0=don't apply operator - * Output: stencil - modified values - */ -static void apply_stencil_op( const GLcontext *ctx, GLenum oper, - GLuint n, GLstencil stencil[], - const GLubyte mask[] ) -{ - const GLstencil ref = ctx->Stencil.Ref; - const GLstencil wrtmask = ctx->Stencil.WriteMask; - const GLstencil invmask = (GLstencil) (~ctx->Stencil.WriteMask); - GLuint i; - - switch (oper) { - case GL_KEEP: - /* do nothing */ - break; - case GL_ZERO: - if (invmask==0) { - for (i=0;i0) { - stencil[i] = (GLstencil) (s-1); - } - } - } - } - else { - for (i=0;i0) { - stencil[i] = (GLstencil) ((invmask & s) | (wrtmask & (s-1))); - } - } - } - } - break; - case GL_INCR_WRAP_EXT: - if (invmask==0) { - for (i=0;iStencil.Function) { - case GL_NEVER: - /* always fail */ - for (i=0;iStencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r < s) { - /* passed */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_LEQUAL: - r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r <= s) { - /* pass */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_GREATER: - r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r > s) { - /* passed */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_GEQUAL: - r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r >= s) { - /* passed */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_EQUAL: - r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r == s) { - /* passed */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_NOTEQUAL: - r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r != s) { - /* passed */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_ALWAYS: - /* always pass */ - for (i=0;iStencil.FailFunc != GL_KEEP) { - apply_stencil_op( ctx, ctx->Stencil.FailFunc, n, stencil, fail ); - } - - return !allfail; -} - - - - -/* - * Apply stencil and depth testing to an array of pixels. - * Hardware or software stencil buffer acceptable. - * Input: n - number of pixels in the span - * z - array [n] of z values - * stencil - array [n] of stencil values - * mask - array [n] of flags (1=test this pixel, 0=skip the pixel) - * Output: stencil - modified stencil values - * mask - array [n] of flags (1=stencil and depth test passed) - * Return: GL_TRUE - all fragments failed the testing - * GL_FALSE - one or more fragments passed the testing - * - */ -static GLboolean -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); - - /* - * Apply the stencil test to the fragments. - * failMask[i] is 1 if the stencil test failed. - */ - if (do_stencil_test( ctx, n, stencil, mask ) == GL_FALSE) { - /* all fragments failed the stencil test, we're done. */ - return GL_FALSE; - } - - - /* - * Some fragments passed the stencil test, apply depth test to them - * and apply Zpass and Zfail stencil ops. - */ - if (ctx->Depth.Test==GL_FALSE) { - /* - * No depth buffer, just apply zpass stencil function to active pixels. - */ - apply_stencil_op( ctx, ctx->Stencil.ZPassFunc, n, stencil, mask ); - } - else { - /* - * Perform depth buffering, then apply zpass or zfail stencil function. - */ - GLubyte passmask[MAX_WIDTH], failmask[MAX_WIDTH], oldmask[MAX_WIDTH]; - GLuint i; - - /* save the current mask bits */ - MEMCPY(oldmask, mask, n * sizeof(GLubyte)); - - /* apply the depth test */ - _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 - * Don't touch the stencil value - * else if oldmask[i] and newmask[i] then - * Depth test passed - * else - * assert(oldmask[i] && !newmask[i]) - * Depth test failed - * endif - */ - for (i=0;iStencil.ZFailFunc != GL_KEEP) { - apply_stencil_op( ctx, ctx->Stencil.ZFailFunc, n, stencil, failmask ); - } - if (ctx->Stencil.ZPassFunc != GL_KEEP) { - apply_stencil_op( ctx, ctx->Stencil.ZPassFunc, n, stencil, passmask ); - } - } - - return GL_TRUE; /* one or more fragments passed both tests */ -} - - - -/* - * Apply stencil and depth testing to the span of pixels. - * Both software and hardware stencil buffers are acceptable. - * Input: n - number of pixels in the span - * x, y - location of leftmost pixel in span - * z - array [n] of z values - * mask - array [n] of flags (1=test this pixel, 0=skip the pixel) - * Output: mask - array [n] of flags (1=stencil and depth test passed) - * Return: GL_TRUE - all fragments failed the testing - * GL_FALSE - one or more fragments passed the testing - * - */ -GLboolean -_mesa_stencil_and_ztest_span( GLcontext *ctx, GLuint n, GLint x, GLint y, - const GLdepth z[], GLubyte mask[] ) -{ - GLstencil stencilRow[MAX_WIDTH]; - GLstencil *stencil; - GLboolean result; - - ASSERT(ctx->Stencil.Enabled); - ASSERT(n <= MAX_WIDTH); - - /* Get initial stencil values */ - if (ctx->Driver.WriteStencilSpan) { - ASSERT(ctx->Driver.ReadStencilSpan); - /* Get stencil values from the hardware stencil buffer */ - (*ctx->Driver.ReadStencilSpan)(ctx, n, x, y, stencilRow); - stencil = stencilRow; - } - else { - /* software stencil buffer */ - stencil = STENCIL_ADDRESS(x, y); - } - - /* do all the stencil/depth testing/updating */ - result = stencil_and_ztest_span( ctx, n, x, y, z, stencil, mask ); - - if (ctx->Driver.WriteStencilSpan) { - /* Write updated stencil values into hardware stencil buffer */ - (ctx->Driver.WriteStencilSpan)(ctx, n, x, y, stencil, mask ); - } - - return result; -} - - - - -/* - * Apply the given stencil operator for each pixel in the array whose - * mask flag is set. This is for software stencil buffers only. - * Input: n - number of pixels in the span - * x, y - array of [n] pixels - * operator - the stencil buffer operator - * mask - array [n] of flag: 1=apply operator, 0=don't apply operator - */ -static void -apply_stencil_op_to_pixels( const GLcontext *ctx, - GLuint n, const GLint x[], const GLint y[], - GLenum oper, const GLubyte mask[] ) -{ - const GLstencil ref = ctx->Stencil.Ref; - const GLstencil wrtmask = ctx->Stencil.WriteMask; - const GLstencil invmask = (GLstencil) (~ctx->Stencil.WriteMask); - GLuint i; - - ASSERT(!ctx->Driver.WriteStencilSpan); /* software stencil buffer only! */ - - switch (oper) { - case GL_KEEP: - /* do nothing */ - break; - case GL_ZERO: - if (invmask==0) { - for (i=0;i0) { - *sptr = (GLstencil) (*sptr - 1); - } - } - } - } - else { - for (i=0;i0) { - *sptr = (GLstencil) ((invmask & *sptr) | (wrtmask & (*sptr-1))); - } - } - } - } - break; - case GL_INCR_WRAP_EXT: - if (invmask==0) { - for (i=0;iDriver.WriteStencilSpan); /* software stencil buffer only! */ - - /* - * Perform stencil test. The results of this operation are stored - * in the fail[] array: - * IF fail[i] is non-zero THEN - * the stencil fail operator is to be applied - * ELSE - * the stencil fail operator is not to be applied - * ENDIF - */ - - switch (ctx->Stencil.Function) { - case GL_NEVER: - /* always fail */ - for (i=0;iStencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r < s) { - /* passed */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_LEQUAL: - r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r <= s) { - /* pass */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_GREATER: - r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r > s) { - /* passed */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_GEQUAL: - r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r >= s) { - /* passed */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_EQUAL: - r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r == s) { - /* passed */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_NOTEQUAL: - r = (GLstencil) (ctx->Stencil.Ref & ctx->Stencil.ValueMask); - for (i=0;iStencil.ValueMask); - if (r != s) { - /* passed */ - fail[i] = 0; - } - else { - fail[i] = 1; - mask[i] = 0; - } - } - else { - fail[i] = 0; - } - } - break; - case GL_ALWAYS: - /* always pass */ - for (i=0;iStencil.FailFunc != GL_KEEP) { - apply_stencil_op_to_pixels( ctx, n, x, y, ctx->Stencil.FailFunc, fail ); - } - - return !allfail; -} - - - - -/* - * Apply stencil and depth testing to an array of pixels. - * 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_ztest_span(), which is well - * commented. - * - * Input: n - number of pixels in the array - * x, y - array of [n] pixel positions - * z - array [n] of z values - * mask - array [n] of flags (1=test this pixel, 0=skip the pixel) - * Output: mask - array [n] of flags (1=stencil and depth test passed) - * Return: GL_TRUE - all fragments failed the testing - * GL_FALSE - one or more fragments passed the testing - */ -GLboolean -_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); - - if (ctx->Driver.WriteStencilPixels) { - /*** Hardware stencil buffer ***/ - GLstencil stencil[PB_SIZE]; - GLubyte mask[PB_SIZE]; - - ASSERT(ctx->Driver.ReadStencilPixels); - (*ctx->Driver.ReadStencilPixels)(ctx, n, x, y, stencil); - - - if (do_stencil_test( ctx, n, stencil, mask ) == GL_FALSE) { - /* all fragments failed the stencil test, we're done. */ - return GL_FALSE; - } - - if (ctx->Depth.Test == GL_FALSE) { - apply_stencil_op( ctx, ctx->Stencil.ZPassFunc, n, stencil, mask ); - } - else { - GLubyte passmask[PB_SIZE], failmask[PB_SIZE], oldmask[PB_SIZE]; - GLuint i; - - MEMCPY(oldmask, mask, n * sizeof(GLubyte)); - - _mesa_depth_test_pixels(ctx, n, x, y, z, mask); - - for (i=0;iStencil.ZFailFunc != GL_KEEP) { - apply_stencil_op( ctx, ctx->Stencil.ZFailFunc, n, stencil, failmask ); - } - if (ctx->Stencil.ZPassFunc != GL_KEEP) { - apply_stencil_op( ctx, ctx->Stencil.ZPassFunc, n, stencil, passmask ); - } - } - - /* Write updated stencil values into hardware stencil buffer */ - (ctx->Driver.WriteStencilPixels)(ctx, n, x, y, stencil, mask ); - - return GL_TRUE; - - } - else { - /*** Software stencil buffer ***/ - - if (stencil_test_pixels(ctx, n, x, y, mask) == GL_FALSE) { - /* all fragments failed the stencil test, we're done. */ - return GL_FALSE; - } - - - if (ctx->Depth.Test==GL_FALSE) { - apply_stencil_op_to_pixels( ctx, n, x, y, ctx->Stencil.ZPassFunc, mask ); - } - else { - GLubyte passmask[PB_SIZE], failmask[PB_SIZE], oldmask[PB_SIZE]; - GLuint i; - - MEMCPY(oldmask, mask, n * sizeof(GLubyte)); - - _mesa_depth_test_pixels(ctx, n, x, y, z, mask); - - for (i=0;iStencil.ZFailFunc != GL_KEEP) { - apply_stencil_op_to_pixels( ctx, n, x, y, - ctx->Stencil.ZFailFunc, failmask ); - } - if (ctx->Stencil.ZPassFunc != GL_KEEP) { - apply_stencil_op_to_pixels( ctx, n, x, y, - ctx->Stencil.ZPassFunc, passmask ); - } - } - - return GL_TRUE; /* one or more fragments passed both tests */ - } -} - - - -/* - * Return a span of stencil values from the stencil buffer. - * Used for glRead/CopyPixels - * Input: n - how many pixels - * x,y - location of first pixel - * Output: stencil - the array of stencil values - */ -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->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) ); -#else - GLuint i; - for (i=0;i= 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; - } - - 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) ); -#else - GLuint i; - for (i=0;iDrawBuffer->Width * ctx->DrawBuffer->Height; - - /* deallocate current stencil buffer if present */ - if (ctx->DrawBuffer->Stencil) { - FREE(ctx->DrawBuffer->Stencil); - ctx->DrawBuffer->Stencil = NULL; - } - - /* allocate new stencil buffer */ - ctx->DrawBuffer->Stencil = (GLstencil *) MALLOC(buffersize * sizeof(GLstencil)); - if (!ctx->DrawBuffer->Stencil) { - /* out of memory */ - _mesa_set_enable( ctx, GL_STENCIL_TEST, GL_FALSE ); - gl_error( ctx, GL_OUT_OF_MEMORY, "_mesa_alloc_stencil_buffer" ); - } -} - - - -/* - * Clear the software (malloc'd) stencil buffer. - */ -static void -clear_software_stencil_buffer( GLcontext *ctx ) -{ - if (ctx->Visual.StencilBits==0 || !ctx->DrawBuffer->Stencil) { - /* no stencil buffer */ - return; - } - - if (ctx->Scissor.Enabled) { - /* clear scissor region only */ - const GLint width = ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin; - if (ctx->Stencil.WriteMask != STENCIL_MAX) { - /* must apply mask to the clear */ - GLint y; - for (y = ctx->DrawBuffer->Ymin; y < ctx->DrawBuffer->Ymax; y++) { - const GLstencil mask = ctx->Stencil.WriteMask; - const GLstencil invMask = ~mask; - const GLstencil clearVal = (ctx->Stencil.Clear & mask); - GLstencil *stencil = STENCIL_ADDRESS( ctx->DrawBuffer->Xmin, y ); - GLint i; - for (i = 0; i < width; i++) { - stencil[i] = (stencil[i] & invMask) | clearVal; - } - } - } - else { - /* no masking */ - GLint y; - for (y = ctx->DrawBuffer->Ymin; y < ctx->DrawBuffer->Ymax; y++) { - GLstencil *stencil = STENCIL_ADDRESS( ctx->DrawBuffer->Xmin, y ); -#if STENCIL_BITS==8 - MEMSET( stencil, ctx->Stencil.Clear, width * sizeof(GLstencil) ); -#else - GLint i; - for (i = 0; i < width; i++) - stencil[x] = ctx->Stencil.Clear; -#endif - } - } - } - else { - /* clear whole stencil buffer */ - if (ctx->Stencil.WriteMask != STENCIL_MAX) { - /* must apply mask to the clear */ - const GLuint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height; - GLstencil *stencil = ctx->DrawBuffer->Stencil; - const GLstencil mask = ctx->Stencil.WriteMask; - const GLstencil invMask = ~mask; - const GLstencil clearVal = (ctx->Stencil.Clear & mask); - GLuint i; - for (i = 0; i < n; i++) { - stencil[i] = (stencil[i] & invMask) | clearVal; - } - } - else { - /* clear whole buffer without masking */ - const GLuint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height; - GLstencil *stencil = ctx->DrawBuffer->Stencil; - -#if STENCIL_BITS==8 - MEMSET(stencil, ctx->Stencil.Clear, n * sizeof(GLstencil) ); -#else - GLuint i; - for (i = 0; i < n; i++) { - stencil[i] = ctx->Stencil.Clear; - } -#endif - } - } -} - - - -/* - * Clear the hardware (in graphics card) stencil buffer. - * This is done with the Driver.WriteStencilSpan() and Driver.ReadStencilSpan() - * functions. - * Actually, if there is a hardware stencil buffer it really should have - * been cleared in Driver.Clear()! However, if the hardware does not - * support scissored clears or masked clears (i.e. glStencilMask) then - * we have to use the span-based functions. - */ -static void -clear_hardware_stencil_buffer( GLcontext *ctx ) -{ - ASSERT(ctx->Driver.WriteStencilSpan); - ASSERT(ctx->Driver.ReadStencilSpan); - - if (ctx->Scissor.Enabled) { - /* clear scissor region only */ - const GLint x = ctx->DrawBuffer->Xmin; - const GLint width = ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin; - if (ctx->Stencil.WriteMask != STENCIL_MAX) { - /* must apply mask to the clear */ - GLint y; - for (y = ctx->DrawBuffer->Ymin; y < ctx->DrawBuffer->Ymax; y++) { - const GLstencil mask = ctx->Stencil.WriteMask; - const GLstencil invMask = ~mask; - const GLstencil clearVal = (ctx->Stencil.Clear & mask); - GLstencil stencil[MAX_WIDTH]; - GLint i; - (*ctx->Driver.ReadStencilSpan)(ctx, x, y, width, stencil); - for (i = 0; i < width; i++) { - stencil[i] = (stencil[i] & invMask) | clearVal; - } - (*ctx->Driver.WriteStencilSpan)(ctx, x, y, width, stencil, NULL); - } - } - else { - /* no masking */ - GLstencil stencil[MAX_WIDTH]; - GLint y, i; - for (i = 0; i < width; i++) { - stencil[i] = ctx->Stencil.Clear; - } - for (y = ctx->DrawBuffer->Ymin; y < ctx->DrawBuffer->Ymax; y++) { - (*ctx->Driver.WriteStencilSpan)(ctx, x, y, width, stencil, NULL); - } - } - } - else { - /* clear whole stencil buffer */ - if (ctx->Stencil.WriteMask != STENCIL_MAX) { - /* must apply mask to the clear */ - const GLstencil mask = ctx->Stencil.WriteMask; - const GLstencil invMask = ~mask; - const GLstencil clearVal = (ctx->Stencil.Clear & mask); - const GLint width = ctx->DrawBuffer->Width; - const GLint height = ctx->DrawBuffer->Height; - const GLint x = ctx->DrawBuffer->Xmin; - GLint y; - for (y = 0; y < height; y++) { - GLstencil stencil[MAX_WIDTH]; - GLuint i; - (*ctx->Driver.ReadStencilSpan)(ctx, x, y, width, stencil); - for (i = 0; i < width; i++) { - stencil[i] = (stencil[i] & invMask) | clearVal; - } - (*ctx->Driver.WriteStencilSpan)(ctx, x, y, width, stencil, NULL); - } - } - else { - /* clear whole buffer without masking */ - const GLint width = ctx->DrawBuffer->Width; - const GLint height = ctx->DrawBuffer->Width; - const GLint x = ctx->DrawBuffer->Xmin; - GLstencil stencil[MAX_WIDTH]; - GLint y, i; - for (i = 0; i < width; i++) { - stencil[i] = ctx->Stencil.Clear; - } - for (y = 0; y < height; y++) { - (*ctx->Driver.WriteStencilSpan)(ctx, x, y, width, stencil, NULL); - } - } - } -} - - - -/* - * Clear the stencil buffer. - */ -void -_mesa_clear_stencil_buffer( GLcontext *ctx ) -{ - if (ctx->Driver.WriteStencilSpan) { - ASSERT(ctx->Driver.ReadStencilSpan); - clear_hardware_stencil_buffer(ctx); - } - else { - clear_software_stencil_buffer(ctx); - } -} - -- cgit v1.2.3