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-rw-r--r--src/mesa/swrast/s_clear.c346
1 files changed, 346 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_clear.c b/src/mesa/swrast/s_clear.c
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+++ b/src/mesa/swrast/s_clear.c
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+/*
+ * Mesa 3-D graphics library
+ * Version: 7.1
+ *
+ * Copyright (C) 1999-2008 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.
+ */
+
+/** XXX This file should be named s_clear.c */
+
+#include "main/glheader.h"
+#include "main/colormac.h"
+#include "main/macros.h"
+#include "main/imports.h"
+#include "main/mtypes.h"
+
+#include "s_accum.h"
+#include "s_context.h"
+#include "s_depth.h"
+#include "s_masking.h"
+#include "s_stencil.h"
+
+
+/**
+ * Clear the color buffer when glColorMask is in effect.
+ */
+static void
+clear_rgba_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+ 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;
+ SWspan span;
+ GLint i;
+
+ ASSERT(ctx->Visual.rgbMode);
+ ASSERT(rb->PutRow);
+
+ /* Initialize color span with clear color */
+ /* XXX optimize for clearcolor == black/zero (bzero) */
+ INIT_SPAN(span, GL_BITMAP);
+ span.end = width;
+ span.arrayMask = SPAN_RGBA;
+ span.array->ChanType = rb->DataType;
+ if (span.array->ChanType == GL_UNSIGNED_BYTE) {
+ GLubyte clearColor[4];
+ UNCLAMPED_FLOAT_TO_UBYTE(clearColor[RCOMP], ctx->Color.ClearColor[0]);
+ UNCLAMPED_FLOAT_TO_UBYTE(clearColor[GCOMP], ctx->Color.ClearColor[1]);
+ UNCLAMPED_FLOAT_TO_UBYTE(clearColor[BCOMP], ctx->Color.ClearColor[2]);
+ UNCLAMPED_FLOAT_TO_UBYTE(clearColor[ACOMP], ctx->Color.ClearColor[3]);
+ for (i = 0; i < width; i++) {
+ COPY_4UBV(span.array->rgba[i], clearColor);
+ }
+ }
+ else if (span.array->ChanType == GL_UNSIGNED_SHORT) {
+ GLushort clearColor[4];
+ UNCLAMPED_FLOAT_TO_USHORT(clearColor[RCOMP], ctx->Color.ClearColor[0]);
+ UNCLAMPED_FLOAT_TO_USHORT(clearColor[GCOMP], ctx->Color.ClearColor[1]);
+ UNCLAMPED_FLOAT_TO_USHORT(clearColor[BCOMP], ctx->Color.ClearColor[2]);
+ UNCLAMPED_FLOAT_TO_USHORT(clearColor[ACOMP], ctx->Color.ClearColor[3]);
+ for (i = 0; i < width; i++) {
+ COPY_4V(span.array->rgba[i], clearColor);
+ }
+ }
+ else {
+ ASSERT(span.array->ChanType == GL_FLOAT);
+ for (i = 0; i < width; i++) {
+ CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][0], ctx->Color.ClearColor[0]);
+ CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][1], ctx->Color.ClearColor[1]);
+ CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][2], ctx->Color.ClearColor[2]);
+ CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][3], ctx->Color.ClearColor[3]);
+ }
+ }
+
+ /* Note that masking will change the color values, but only the
+ * channels for which the write mask is GL_FALSE. The channels
+ * which which are write-enabled won't get modified.
+ */
+ for (i = 0; i < height; i++) {
+ span.x = x;
+ span.y = y + i;
+ _swrast_mask_rgba_span(ctx, rb, &span);
+ /* write masked row */
+ rb->PutRow(ctx, rb, width, x, y + i, span.array->rgba, NULL);
+ }
+}
+
+
+/**
+ * Clear color index buffer with masking.
+ */
+static void
+clear_ci_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+ 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;
+ SWspan span;
+ GLint i;
+
+ ASSERT(!ctx->Visual.rgbMode);
+ ASSERT(rb->PutRow);
+ ASSERT(rb->DataType == GL_UNSIGNED_INT);
+
+ /* Initialize index span with clear index */
+ INIT_SPAN(span, GL_BITMAP);
+ span.end = width;
+ span.arrayMask = SPAN_INDEX;
+ for (i = 0; i < width;i++) {
+ span.array->index[i] = ctx->Color.ClearIndex;
+ }
+
+ /* Note that masking will change the color indexes, but only the
+ * bits for which the write mask is GL_FALSE. The bits
+ * which are write-enabled won't get modified.
+ */
+ for (i = 0; i < height;i++) {
+ span.x = x;
+ span.y = y + i;
+ _swrast_mask_ci_span(ctx, rb, &span);
+ /* write masked row */
+ rb->PutRow(ctx, rb, width, x, y + i, span.array->index, NULL);
+ }
+}
+
+
+/**
+ * Clear an rgba color buffer without channel masking.
+ */
+static void
+clear_rgba_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+ 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;
+ GLubyte clear8[4];
+ GLushort clear16[4];
+ GLvoid *clearVal;
+ GLint i;
+
+ ASSERT(ctx->Visual.rgbMode);
+
+ ASSERT(ctx->Color.ColorMask[0] &&
+ ctx->Color.ColorMask[1] &&
+ ctx->Color.ColorMask[2] &&
+ ctx->Color.ColorMask[3]);
+
+ ASSERT(rb->PutMonoRow);
+
+ switch (rb->DataType) {
+ case GL_UNSIGNED_BYTE:
+ UNCLAMPED_FLOAT_TO_UBYTE(clear8[0], ctx->Color.ClearColor[0]);
+ UNCLAMPED_FLOAT_TO_UBYTE(clear8[1], ctx->Color.ClearColor[1]);
+ UNCLAMPED_FLOAT_TO_UBYTE(clear8[2], ctx->Color.ClearColor[2]);
+ UNCLAMPED_FLOAT_TO_UBYTE(clear8[3], ctx->Color.ClearColor[3]);
+ clearVal = clear8;
+ break;
+ case GL_UNSIGNED_SHORT:
+ UNCLAMPED_FLOAT_TO_USHORT(clear16[0], ctx->Color.ClearColor[0]);
+ UNCLAMPED_FLOAT_TO_USHORT(clear16[1], ctx->Color.ClearColor[1]);
+ UNCLAMPED_FLOAT_TO_USHORT(clear16[2], ctx->Color.ClearColor[2]);
+ UNCLAMPED_FLOAT_TO_USHORT(clear16[3], ctx->Color.ClearColor[3]);
+ clearVal = clear16;
+ break;
+ case GL_FLOAT:
+ clearVal = ctx->Color.ClearColor;
+ break;
+ default:
+ _mesa_problem(ctx, "Bad rb DataType in clear_color_buffer");
+ return;
+ }
+
+ for (i = 0; i < height; i++) {
+ rb->PutMonoRow(ctx, rb, width, x, y + i, clearVal, NULL);
+ }
+}
+
+
+/**
+ * Clear color index buffer without masking.
+ */
+static void
+clear_ci_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+ 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;
+ GLubyte clear8;
+ GLushort clear16;
+ GLuint clear32;
+ GLvoid *clearVal;
+ GLint i;
+
+ ASSERT(!ctx->Visual.rgbMode);
+
+ ASSERT((ctx->Color.IndexMask & ((1 << rb->IndexBits) - 1))
+ == (GLuint) ((1 << rb->IndexBits) - 1));
+
+ ASSERT(rb->PutMonoRow);
+
+ /* setup clear value */
+ switch (rb->DataType) {
+ case GL_UNSIGNED_BYTE:
+ clear8 = (GLubyte) ctx->Color.ClearIndex;
+ clearVal = &clear8;
+ break;
+ case GL_UNSIGNED_SHORT:
+ clear16 = (GLushort) ctx->Color.ClearIndex;
+ clearVal = &clear16;
+ break;
+ case GL_UNSIGNED_INT:
+ clear32 = ctx->Color.ClearIndex;
+ clearVal = &clear32;
+ break;
+ default:
+ _mesa_problem(ctx, "Bad rb DataType in clear_color_buffer");
+ return;
+ }
+
+ for (i = 0; i < height; i++)
+ rb->PutMonoRow(ctx, rb, width, x, y + i, clearVal, NULL);
+}
+
+
+/**
+ * Clear the front/back/left/right/aux color buffers.
+ * This function is usually only called if the device driver can't
+ * clear its own color buffers for some reason (such as with masking).
+ */
+static void
+clear_color_buffers(GLcontext *ctx)
+{
+ GLboolean masking;
+ GLuint buf;
+
+ if (ctx->Visual.rgbMode) {
+ if (ctx->Color.ColorMask[0] &&
+ ctx->Color.ColorMask[1] &&
+ ctx->Color.ColorMask[2] &&
+ ctx->Color.ColorMask[3]) {
+ masking = GL_FALSE;
+ }
+ else {
+ masking = GL_TRUE;
+ }
+ }
+ else {
+ struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+ const GLuint indexBits = (1 << rb->IndexBits) - 1;
+ if ((ctx->Color.IndexMask & indexBits) == indexBits) {
+ masking = GL_FALSE;
+ }
+ else {
+ masking = GL_TRUE;
+ }
+ }
+
+ for (buf = 0; buf < ctx->DrawBuffer->_NumColorDrawBuffers; buf++) {
+ struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[buf];
+ if (ctx->Visual.rgbMode) {
+ if (masking) {
+ clear_rgba_buffer_with_masking(ctx, rb);
+ }
+ else {
+ clear_rgba_buffer(ctx, rb);
+ }
+ }
+ else {
+ if (masking) {
+ clear_ci_buffer_with_masking(ctx, rb);
+ }
+ else {
+ clear_ci_buffer(ctx, rb);
+ }
+ }
+ }
+}
+
+
+/**
+ * Called via the device driver's ctx->Driver.Clear() function if the
+ * device driver can't clear one or more of the buffers itself.
+ * \param buffers bitfield of BUFFER_BIT_* values indicating which
+ * renderbuffers are to be cleared.
+ * \param all if GL_TRUE, clear whole buffer, else clear specified region.
+ */
+void
+_swrast_Clear(GLcontext *ctx, GLbitfield buffers)
+{
+#ifdef DEBUG_FOO
+ {
+ const GLbitfield legalBits =
+ BUFFER_BIT_FRONT_LEFT |
+ BUFFER_BIT_FRONT_RIGHT |
+ BUFFER_BIT_BACK_LEFT |
+ BUFFER_BIT_BACK_RIGHT |
+ BUFFER_BIT_DEPTH |
+ BUFFER_BIT_STENCIL |
+ BUFFER_BIT_ACCUM |
+ BUFFER_BIT_AUX0;
+ assert((buffers & (~legalBits)) == 0);
+ }
+#endif
+
+ swrast_render_start(ctx);
+
+ /* do software clearing here */
+ if (buffers) {
+ if ((buffers & BUFFER_BITS_COLOR)
+ && (ctx->DrawBuffer->_NumColorDrawBuffers > 0)) {
+ clear_color_buffers(ctx);
+ }
+ if (buffers & BUFFER_BIT_DEPTH) {
+ _swrast_clear_depth_buffer(ctx, ctx->DrawBuffer->_DepthBuffer);
+ }
+ if (buffers & BUFFER_BIT_ACCUM) {
+ _swrast_clear_accum_buffer(ctx,
+ ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
+ }
+ if (buffers & BUFFER_BIT_STENCIL) {
+ _swrast_clear_stencil_buffer(ctx, ctx->DrawBuffer->_StencilBuffer);
+ }
+ }
+
+ swrast_render_finish(ctx);
+}
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