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Diffstat (limited to 'src/mesa/swrast/s_buffers.c')
-rw-r--r--src/mesa/swrast/s_buffers.c257
1 files changed, 257 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_buffers.c b/src/mesa/swrast/s_buffers.c
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+++ b/src/mesa/swrast/s_buffers.c
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+/* $Id: s_buffers.c,v 1.1 2000/10/31 18:00:04 keithw Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version: 3.5
+ *
+ * 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"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+#include "glheader.h"
+#include "macros.h"
+#include "mem.h"
+
+#include "s_accum.h"
+#include "s_alphabuf.h"
+#include "s_depth.h"
+#include "s_masking.h"
+#include "s_stencil.h"
+
+
+
+
+/*
+ * Clear the color buffer when glColorMask or glIndexMask is in effect.
+ */
+static void
+clear_color_buffer_with_masking( GLcontext *ctx )
+{
+ const GLint x = ctx->DrawBuffer->Xmin;
+ const GLint y = ctx->DrawBuffer->Ymin;
+ const GLint height = ctx->DrawBuffer->Ymax - ctx->DrawBuffer->Ymin;
+ const GLint width = ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin;
+
+ if (ctx->Visual.RGBAflag) {
+ /* RGBA mode */
+ const GLchan r = (GLint) (ctx->Color.ClearColor[0] * CHAN_MAXF);
+ const GLchan g = (GLint) (ctx->Color.ClearColor[1] * CHAN_MAXF);
+ const GLchan b = (GLint) (ctx->Color.ClearColor[2] * CHAN_MAXF);
+ const GLchan a = (GLint) (ctx->Color.ClearColor[3] * CHAN_MAXF);
+ GLint i;
+ for (i = 0; i < height; i++) {
+ GLchan rgba[MAX_WIDTH][4];
+ GLint j;
+ for (j=0; j<width; j++) {
+ rgba[j][RCOMP] = r;
+ rgba[j][GCOMP] = g;
+ rgba[j][BCOMP] = b;
+ rgba[j][ACOMP] = a;
+ }
+ _mesa_mask_rgba_span( ctx, width, x, y + i, rgba );
+ (*ctx->Driver.WriteRGBASpan)( ctx, width, x, y + i,
+ (CONST GLchan (*)[4]) rgba, NULL );
+ }
+ }
+ else {
+ /* Color index mode */
+ GLuint span[MAX_WIDTH];
+ GLubyte mask[MAX_WIDTH];
+ GLint i, j;
+ MEMSET( mask, 1, width );
+ for (i=0;i<height;i++) {
+ for (j=0;j<width;j++) {
+ span[j] = ctx->Color.ClearIndex;
+ }
+ _mesa_mask_index_span( ctx, width, x, y + i, span );
+ (*ctx->Driver.WriteCI32Span)( ctx, width, x, y + i, span, mask );
+ }
+ }
+}
+
+
+
+/*
+ * Clear a color buffer without index/channel masking.
+ */
+static void
+clear_color_buffer(GLcontext *ctx)
+{
+ const GLint x = ctx->DrawBuffer->Xmin;
+ const GLint y = ctx->DrawBuffer->Ymin;
+ const GLint height = ctx->DrawBuffer->Ymax - ctx->DrawBuffer->Ymin;
+ const GLint width = ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin;
+
+ if (ctx->Visual.RGBAflag) {
+ /* RGBA mode */
+ const GLchan r = (GLint) (ctx->Color.ClearColor[0] * CHAN_MAXF);
+ const GLchan g = (GLint) (ctx->Color.ClearColor[1] * CHAN_MAXF);
+ const GLchan b = (GLint) (ctx->Color.ClearColor[2] * CHAN_MAXF);
+ const GLchan a = (GLint) (ctx->Color.ClearColor[3] * CHAN_MAXF);
+ GLchan span[MAX_WIDTH][4];
+ GLint i;
+
+ ASSERT(*((GLuint *) &ctx->Color.ColorMask) == 0xffffffff);
+
+ for (i = 0; i < width; i++) {
+ span[i][RCOMP] = r;
+ span[i][GCOMP] = g;
+ span[i][BCOMP] = b;
+ span[i][ACOMP] = a;
+ }
+ for (i = 0; i < height; i++) {
+ (*ctx->Driver.WriteRGBASpan)( ctx, width, x, y + i,
+ (CONST GLchan (*)[4]) span, NULL );
+ }
+ }
+ else {
+ /* Color index mode */
+ ASSERT(ctx->Color.IndexMask == ~0);
+ if (ctx->Visual.IndexBits == 8) {
+ /* 8-bit clear */
+ GLubyte span[MAX_WIDTH];
+ GLint i;
+ MEMSET(span, ctx->Color.ClearIndex, width);
+ for (i = 0; i < height; i++) {
+ (*ctx->Driver.WriteCI8Span)( ctx, width, x, y + i, span, NULL );
+ }
+ }
+ else {
+ /* non 8-bit clear */
+ GLuint span[MAX_WIDTH];
+ GLint i;
+ for (i = 0; i < width; i++) {
+ span[i] = ctx->Color.ClearIndex;
+ }
+ for (i = 0; i < height; i++) {
+ (*ctx->Driver.WriteCI32Span)( ctx, width, x, y + i, span, NULL );
+ }
+ }
+ }
+}
+
+
+
+/*
+ * Clear the front/back/left/right color buffers.
+ * This function is usually only called if we need to clear the
+ * buffers with masking.
+ */
+static void
+clear_color_buffers(GLcontext *ctx)
+{
+ const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
+ GLuint bufferBit;
+
+ /* loop over four possible dest color buffers */
+ for (bufferBit = 1; bufferBit <= 8; bufferBit = bufferBit << 1) {
+ if (bufferBit & ctx->Color.DrawDestMask) {
+ if (bufferBit == FRONT_LEFT_BIT) {
+ (void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_FRONT_LEFT);
+ (void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_FRONT_LEFT);
+ }
+ else if (bufferBit == FRONT_RIGHT_BIT) {
+ (void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_FRONT_RIGHT);
+ (void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_FRONT_RIGHT);
+ }
+ else if (bufferBit == BACK_LEFT_BIT) {
+ (void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_BACK_LEFT);
+ (void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_BACK_LEFT);
+ }
+ else {
+ (void) (*ctx->Driver.SetDrawBuffer)( ctx, GL_BACK_RIGHT);
+ (void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer, GL_BACK_RIGHT);
+ }
+
+ if (colorMask != 0xffffffff) {
+ clear_color_buffer_with_masking(ctx);
+ }
+ else {
+ clear_color_buffer(ctx);
+ }
+ }
+ }
+
+ /* restore default read/draw buffers */
+ (void) (*ctx->Driver.SetDrawBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+ (void) (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer, ctx->Pixel.DriverReadBuffer );
+}
+
+
+
+void
+_swrast_Clear( GLcontext *ctx, GLbitfield mask,
+ GLboolean all,
+ GLint x, GLint y, GLint width, GLint height )
+{
+
+#ifdef DEBUG
+ {
+ GLbitfield legalBits = DD_FRONT_LEFT_BIT |
+ DD_FRONT_RIGHT_BIT |
+ DD_BACK_LEFT_BIT |
+ DD_BACK_RIGHT_BIT |
+ DD_DEPTH_BIT |
+ DD_STENCIL_BIT |
+ DD_ACCUM_BIT;
+ assert((mask & (~legalBits)) == 0);
+ }
+#endif
+
+ RENDER_START(ctx);
+
+ /* do software clearing here */
+ if (mask) {
+ if (mask & ctx->Color.DrawDestMask) clear_color_buffers(ctx);
+ if (mask & GL_DEPTH_BUFFER_BIT) _mesa_clear_depth_buffer(ctx);
+ if (mask & GL_ACCUM_BUFFER_BIT) _mesa_clear_accum_buffer(ctx);
+ if (mask & GL_STENCIL_BUFFER_BIT) _mesa_clear_stencil_buffer(ctx);
+ }
+
+ /* clear software-based alpha buffer(s) */
+ if ( (mask & GL_COLOR_BUFFER_BIT)
+ && ctx->DrawBuffer->UseSoftwareAlphaBuffers
+ && ctx->Color.ColorMask[ACOMP]) {
+ _mesa_clear_alpha_buffers( ctx );
+ }
+
+ RENDER_FINISH(ctx);
+}
+
+
+void
+_swrast_alloc_buffers( GLcontext *ctx )
+{
+ /* Reallocate other buffers if needed. */
+ if (ctx->DrawBuffer->UseSoftwareDepthBuffer) {
+ _mesa_alloc_depth_buffer( ctx );
+ }
+ if (ctx->DrawBuffer->UseSoftwareStencilBuffer) {
+ _mesa_alloc_stencil_buffer( ctx );
+ }
+ if (ctx->DrawBuffer->UseSoftwareAccumBuffer) {
+ _mesa_alloc_accum_buffer( ctx );
+ }
+ if (ctx->DrawBuffer->UseSoftwareAlphaBuffers) {
+ _mesa_alloc_alpha_buffers( ctx );
+ }
+}
+
+
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