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https://gitlab.freedesktop.org/mesa/mesa.git
synced 2026-05-05 07:28:11 +02:00
clip depth/stencil spans to window bounds
This commit is contained in:
Brian Paul
parent
4fe34b27f6
commit
d0130a989a
5 changed files with 178 additions and 56 deletions
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@ -1,4 +1,4 @@
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/* $Id: depth.c,v 1.16 2000/04/04 00:54:23 brianp Exp $ */
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/* $Id: depth.c,v 1.17 2000/04/11 20:42:22 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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@ -1417,6 +1417,74 @@ _mesa_depth_test_pixels( GLcontext *ctx,
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/**********************************************************************/
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/*
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* Read a span of depth values from the depth buffer.
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* This function does clipping before calling the device driver function.
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*/
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void
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_mesa_read_depth_span( GLcontext *ctx,
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GLint n, GLint x, GLint y, GLdepth depth[] )
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{
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if (y < 0 || y >= ctx->DrawBuffer->Height ||
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x + (GLint) n <= 0 || x >= ctx->DrawBuffer->Width) {
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/* span is completely outside framebuffer */
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GLint i;
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for (i = 0; i < n; i++)
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depth[i] = 0;
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return;
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}
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if (x < 0) {
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GLint dx = -x;
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GLint i;
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for (i = 0; i < dx; i++)
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depth[i] = 0;
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x = 0;
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n -= dx;
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depth += dx;
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}
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if (x + n > ctx->DrawBuffer->Width) {
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GLint dx = x + n - ctx->DrawBuffer->Width;
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GLint i;
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for (i = 0; i < dx; i++)
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depth[n - i - 1] = 0;
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n -= dx;
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}
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if (n <= 0) {
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return;
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}
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if (ctx->DrawBuffer->DepthBuffer) {
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/* read from software depth buffer */
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if (ctx->Visual->DepthBits <= 16) {
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const GLushort *zptr = Z_ADDRESS16( ctx, x, y );
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GLuint i;
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for (i = 0; i < n; i++) {
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depth[i] = zptr[i];
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}
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}
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else {
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const GLuint *zptr = Z_ADDRESS32( ctx, x, y );
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GLuint i;
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for (i = 0; i < n; i++) {
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depth[i] = zptr[i];
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}
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}
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}
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else if (ctx->Driver.ReadDepthSpan) {
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/* read from hardware depth buffer */
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(*ctx->Driver.ReadDepthSpan)( ctx, n, x, y, depth );
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}
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else {
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/* no depth buffer */
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BZERO(depth, n * sizeof(GLfloat));
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}
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}
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/*
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* Return a span of depth values from the depth buffer as floats in [0,1].
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* This is used for both hardware and software depth buffers.
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@ -1425,11 +1493,39 @@ _mesa_depth_test_pixels( GLcontext *ctx,
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* Output: depth - the array of depth values
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*/
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void
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_mesa_read_depth_span_float( GLcontext* ctx,
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GLuint n, GLint x, GLint y, GLfloat depth[] )
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_mesa_read_depth_span_float( GLcontext *ctx,
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GLint n, GLint x, GLint y, GLfloat depth[] )
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{
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const GLfloat scale = 1.0F / ctx->Visual->DepthMaxF;
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if (y < 0 || y >= ctx->DrawBuffer->Height ||
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x + (GLint) n <= 0 || x >= ctx->DrawBuffer->Width) {
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/* span is completely outside framebuffer */
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GLint i;
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for (i = 0; i < n; i++)
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depth[i] = 0.0F;
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return;
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}
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if (x < 0) {
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GLint dx = -x;
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GLint i;
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for (i = 0; i < dx; i++)
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depth[i] = 0.0F;
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n -= dx;
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x = 0;
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}
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if (x + n > ctx->DrawBuffer->Width) {
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GLint dx = x + n - ctx->DrawBuffer->Width;
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GLint i;
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for (i = 0; i < dx; i++)
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depth[n - i - 1] = 0.0F;
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n -= dx;
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}
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if (n <= 0) {
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return;
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}
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if (ctx->DrawBuffer->DepthBuffer) {
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/* read from software depth buffer */
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if (ctx->Visual->DepthBits <= 16) {
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@ -1,4 +1,4 @@
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/* $Id: depth.h,v 1.7 2000/03/03 17:47:39 brianp Exp $ */
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/* $Id: depth.h,v 1.8 2000/04/11 20:42:22 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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@ -68,7 +68,12 @@ _mesa_depth_test_pixels( GLcontext *ctx,
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extern void
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_mesa_read_depth_span_float( GLcontext *ctx, GLuint n, GLint x, GLint y,
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_mesa_read_depth_span( GLcontext *ctx,
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GLint n, GLint x, GLint y, GLdepth depth[] );
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extern void
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_mesa_read_depth_span_float( GLcontext *ctx, GLint n, GLint x, GLint y,
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GLfloat depth[] );
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@ -1,4 +1,4 @@
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/* $Id: drawpix.c,v 1.18 2000/04/08 18:57:45 brianp Exp $ */
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/* $Id: drawpix.c,v 1.19 2000/04/11 20:42:22 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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@ -479,7 +479,7 @@ draw_stencil_pixels( GLcontext *ctx, GLint x, GLint y,
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values, desty );
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}
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else {
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gl_write_stencil_span( ctx, (GLuint) drawWidth, x, y, values );
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_mesa_write_stencil_span( ctx, (GLuint) drawWidth, x, y, values );
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}
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}
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}
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@ -1,4 +1,4 @@
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/* $Id: stencil.c,v 1.14 2000/02/02 22:16:04 brianp Exp $ */
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/* $Id: stencil.c,v 1.15 2000/04/11 20:42:22 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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@ -1130,24 +1130,44 @@ gl_stencil_and_depth_test_pixels( GLcontext *ctx,
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* x,y - location of first pixel
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* Output: stencil - the array of stencil values
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*/
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void gl_read_stencil_span( GLcontext *ctx,
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GLint n, GLint x, GLint y, GLstencil stencil[] )
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void
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_mesa_read_stencil_span( GLcontext *ctx,
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GLint n, GLint x, GLint y, GLstencil stencil[] )
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{
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if (y < 0 || y >= ctx->DrawBuffer->Height ||
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x + n <= 0 || x >= ctx->DrawBuffer->Width) {
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/* span is completely outside framebuffer */
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return; /* undefined values OK */
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}
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if (x < 0) {
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GLint dx = -x;
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x = 0;
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n -= dx;
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stencil += dx;
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}
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if (x + n > ctx->DrawBuffer->Width) {
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GLint dx = x + n - ctx->DrawBuffer->Width;
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n -= dx;
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}
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if (n <= 0) {
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return;
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}
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ASSERT(n >= 0);
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if (ctx->DrawBuffer->Stencil) {
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if (ctx->Driver.ReadStencilSpan) {
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(*ctx->Driver.ReadStencilSpan)( ctx, (GLuint) n, x, y, stencil );
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}
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else {
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const GLstencil *s = STENCIL_ADDRESS( x, y );
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if (ctx->Driver.ReadStencilSpan) {
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(*ctx->Driver.ReadStencilSpan)( ctx, (GLuint) n, x, y, stencil );
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}
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else if (ctx->DrawBuffer->Stencil) {
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const GLstencil *s = STENCIL_ADDRESS( x, y );
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#if STENCIL_BITS == 8
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MEMCPY( stencil, s, n * sizeof(GLstencil) );
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MEMCPY( stencil, s, n * sizeof(GLstencil) );
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#else
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GLuint i;
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for (i=0;i<n;i++)
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stencil[i] = s[i];
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GLuint i;
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for (i=0;i<n;i++)
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stencil[i] = s[i];
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#endif
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}
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}
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}
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@ -1160,41 +1180,42 @@ void gl_read_stencil_span( GLcontext *ctx,
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* x, y - location of first pixel
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* stencil - the array of stencil values
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*/
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void gl_write_stencil_span( GLcontext *ctx,
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GLint n, GLint x, GLint y,
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const GLstencil stencil[] )
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void
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_mesa_write_stencil_span( GLcontext *ctx, GLint n, GLint x, GLint y,
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const GLstencil stencil[] )
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{
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ASSERT(n >= 0);
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if (ctx->DrawBuffer->Stencil) {
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/* do clipping */
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if (y < ctx->DrawBuffer->Ymin || y > ctx->DrawBuffer->Ymax)
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return;
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if (x < ctx->DrawBuffer->Xmin) {
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GLint diff = ctx->DrawBuffer->Xmin - x;
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n -= diff;
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stencil += diff;
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x = ctx->DrawBuffer->Xmin;
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}
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if (x + n > ctx->DrawBuffer->Xmax) {
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GLint diff = x + n - ctx->DrawBuffer->Xmax;
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n -= diff;
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}
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if (y < 0 || y >= ctx->DrawBuffer->Height ||
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x + n <= 0 || x >= ctx->DrawBuffer->Width) {
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/* span is completely outside framebuffer */
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return; /* undefined values OK */
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}
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ASSERT( n >= 0);
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if (x < 0) {
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GLint dx = -x;
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x = 0;
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n -= dx;
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stencil += dx;
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}
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if (x + n > ctx->DrawBuffer->Width) {
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GLint dx = x + n - ctx->DrawBuffer->Width;
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n -= dx;
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}
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if (n <= 0) {
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return;
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}
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if (ctx->Driver.WriteStencilSpan) {
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(*ctx->Driver.WriteStencilSpan)( ctx, n, x, y, stencil, NULL );
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}
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else {
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GLstencil *s = STENCIL_ADDRESS( x, y );
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if (ctx->Driver.WriteStencilSpan) {
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(*ctx->Driver.WriteStencilSpan)( ctx, n, x, y, stencil, NULL );
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}
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else if (ctx->DrawBuffer->Stencil) {
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GLstencil *s = STENCIL_ADDRESS( x, y );
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#if STENCIL_BITS == 8
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MEMCPY( s, stencil, n * sizeof(GLstencil) );
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MEMCPY( s, stencil, n * sizeof(GLstencil) );
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#else
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GLuint i;
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for (i=0;i<n;i++)
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s[i] = stencil[i];
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GLuint i;
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for (i=0;i<n;i++)
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s[i] = stencil[i];
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#endif
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}
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}
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}
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@ -1,10 +1,10 @@
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/* $Id: stencil.h,v 1.4 1999/12/13 04:08:27 joukj Exp $ */
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/* $Id: stencil.h,v 1.5 2000/04/11 20:42:22 brianp Exp $ */
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/*
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* Mesa 3-D graphics library
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* Version: 3.3
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*
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* Copyright (C) 1999 Brian Paul All Rights Reserved.
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* Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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@ -64,13 +64,13 @@ gl_stencil_and_depth_test_pixels( GLcontext *ctx, GLuint n,
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extern void
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gl_read_stencil_span( GLcontext *ctx, GLint n, GLint x, GLint y,
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GLstencil stencil[] );
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_mesa_read_stencil_span( GLcontext *ctx, GLint n, GLint x, GLint y,
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GLstencil stencil[] );
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extern void
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gl_write_stencil_span( GLcontext *ctx, GLint n, GLint x, GLint y,
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const GLstencil stencil[] );
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_mesa_write_stencil_span( GLcontext *ctx, GLint n, GLint x, GLint y,
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const GLstencil stencil[] );
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extern void gl_alloc_stencil_buffer( GLcontext *ctx );
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