-/* $Id: s_buffers.c,v 1.17 2003/03/25 02:23:45 brianp Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 5.1
+ * Version: 6.5.2
*
- * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2006 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"),
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
+/** XXX This file should be named s_clear.c */
#include "glheader.h"
#include "colormac.h"
#include "macros.h"
#include "imports.h"
+#include "mtypes.h"
#include "s_accum.h"
-#include "s_alphabuf.h"
#include "s_context.h"
#include "s_depth.h"
#include "s_masking.h"
#include "s_stencil.h"
-
-
-/*
- * Clear the color buffer when glColorMask or glIndexMask is in effect.
+/**
+ * Clear the color buffer when glColorMask is in effect.
*/
static void
-clear_color_buffer_with_masking( GLcontext *ctx )
+clear_rgba_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
{
- SWcontext *swrast = SWRAST_CONTEXT(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.rgbMode) {
- /* RGBA mode */
- GLchan clearColor[4];
- GLint i;
- CLAMPED_FLOAT_TO_CHAN(clearColor[RCOMP], ctx->Color.ClearColor[0]);
- CLAMPED_FLOAT_TO_CHAN(clearColor[GCOMP], ctx->Color.ClearColor[1]);
- CLAMPED_FLOAT_TO_CHAN(clearColor[BCOMP], ctx->Color.ClearColor[2]);
- CLAMPED_FLOAT_TO_CHAN(clearColor[ACOMP], ctx->Color.ClearColor[3]);
- for (i = 0; i < height; i++) {
- GLchan rgba[MAX_WIDTH][4];
- GLint j;
- for (j = 0; j < width; j++) {
- COPY_CHAN4(rgba[j], clearColor);
- }
- _swrast_mask_rgba_array( ctx, width, x, y + i, rgba );
- (*swrast->Driver.WriteRGBASpan)( ctx, width, x, y + i,
- (CONST GLchan (*)[4]) rgba, NULL );
+ 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, width, 0, 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 {
- /* 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;
- }
- _swrast_mask_index_array( ctx, width, x, y + i, span );
- (*swrast->Driver.WriteCI32Span)( ctx, width, x, y + i, span, mask );
+ 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 a color buffer without index/channel masking.
+/**
+ * Clear color index buffer with masking.
*/
static void
-clear_color_buffer(GLcontext *ctx)
+clear_ci_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
{
- SWcontext *swrast = SWRAST_CONTEXT(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;
+ SWspan span;
+ GLint i;
- if (ctx->Visual.rgbMode) {
- /* RGBA mode */
- GLchan clearColor[4];
- GLint i;
+ ASSERT(!ctx->Visual.rgbMode);
+ ASSERT(rb->PutRow);
+ ASSERT(rb->DataType == GL_UNSIGNED_INT);
- CLAMPED_FLOAT_TO_CHAN(clearColor[RCOMP], ctx->Color.ClearColor[0]);
- CLAMPED_FLOAT_TO_CHAN(clearColor[GCOMP], ctx->Color.ClearColor[1]);
- CLAMPED_FLOAT_TO_CHAN(clearColor[BCOMP], ctx->Color.ClearColor[2]);
- CLAMPED_FLOAT_TO_CHAN(clearColor[ACOMP], ctx->Color.ClearColor[3]);
+ /* Initialize index span with clear index */
+ INIT_SPAN(span, GL_BITMAP, width, 0, SPAN_RGBA);
+ for (i = 0; i < width;i++) {
+ span.array->index[i] = ctx->Color.ClearIndex;
+ }
- ASSERT(*((GLuint *) &ctx->Color.ColorMask) == 0xffffffff);
- ASSERT(swrast->Driver.WriteRGBASpan);
+ /* 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);
+ }
+}
- for (i = 0; i < height; i++) {
- (*swrast->Driver.WriteMonoRGBASpan)( ctx, width, x, y + i,
- clearColor, 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;
}
- else {
- /* Color index mode */
- GLint i;
- ASSERT((ctx->Color.IndexMask & ((1 << ctx->Visual.indexBits) - 1))
- == (GLuint) ((1 << ctx->Visual.indexBits) - 1));
- ASSERT(swrast->Driver.WriteMonoCISpan);
- for (i = 0; i < height; i++) {
- (*swrast->Driver.WriteMonoCISpan)( ctx, width, x, y + i,
- ctx->Color.ClearIndex, NULL);
- }
+
+ 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 color buffers.
- * This function is usually only called if we need to clear the
- * buffers with masking.
+/**
+ * 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)
{
- SWcontext *swrast = SWRAST_CONTEXT(ctx);
- const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask);
- GLuint bufferBit;
+ GLboolean masking;
+ GLuint i;
- /* loop over four possible dest color buffers */
- for (bufferBit = 1; bufferBit <= 8; bufferBit = bufferBit << 1) {
- if (bufferBit & ctx->Color._DrawDestMask) {
- (*swrast->Driver.SetBuffer)(ctx, ctx->DrawBuffer, bufferBit);
+ 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][0];
+ const GLuint indexBits = (1 << rb->IndexBits) - 1;
+ if ((ctx->Color.IndexMask & indexBits) == indexBits) {
+ masking = GL_FALSE;
+ }
+ else {
+ masking = GL_TRUE;
+ }
+ }
- if (colorMask != 0xffffffff) {
- clear_color_buffer_with_masking(ctx);
+ for (i = 0; i < ctx->DrawBuffer->_NumColorDrawBuffers[0]; i++) {
+ struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0][i];
+ if (ctx->Visual.rgbMode) {
+ if (masking) {
+ clear_rgba_buffer_with_masking(ctx, rb);
}
else {
- clear_color_buffer(ctx);
+ clear_rgba_buffer(ctx, rb);
+ }
+ }
+ else {
+ if (masking) {
+ clear_ci_buffer_with_masking(ctx, rb);
+ }
+ else {
+ clear_ci_buffer(ctx, rb);
}
}
}
-
- /* restore default read/draw buffer */
- _swrast_use_draw_buffer(ctx);
}
-
+/**
+ * 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 mask,
- GLboolean all,
- GLint x, GLint y, GLint width, GLint height )
+_swrast_Clear(GLcontext *ctx, GLbitfield buffers)
{
SWcontext *swrast = SWRAST_CONTEXT(ctx);
-#ifdef DEBUG
+
+#ifdef DEBUG_FOO
{
- 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);
+ 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 |
+ BUFFER_BIT_AUX1 |
+ BUFFER_BIT_AUX2 |
+ BUFFER_BIT_AUX3;
+ assert((buffers & (~legalBits)) == 0);
}
#endif
RENDER_START(swrast,ctx);
/* do software clearing here */
- if (mask) {
- if (mask & ctx->Color._DrawDestMask) clear_color_buffers(ctx);
- if (mask & GL_DEPTH_BUFFER_BIT) _swrast_clear_depth_buffer(ctx);
- if (mask & GL_ACCUM_BUFFER_BIT) _swarst_clear_accum_buffer(ctx);
- if (mask & GL_STENCIL_BUFFER_BIT) _swrast_clear_stencil_buffer(ctx);
- }
-
- /* clear software-based alpha buffer(s) */
- if ( (mask & GL_COLOR_BUFFER_BIT)
- && ctx->DrawBuffer->UseSoftwareAlphaBuffers
- && ctx->Color.ColorMask[ACOMP]) {
- _swrast_clear_alpha_buffers( ctx );
+ if (buffers) {
+ if (buffers & ctx->DrawBuffer->_ColorDrawBufferMask[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);
+ }
}
RENDER_FINISH(swrast,ctx);
}
-
-
-void
-_swrast_alloc_buffers( GLframebuffer *buffer )
-{
- /* Reallocate other buffers if needed. */
- if (buffer->UseSoftwareDepthBuffer) {
- _swrast_alloc_depth_buffer( buffer );
- }
- if (buffer->UseSoftwareStencilBuffer) {
- _swrast_alloc_stencil_buffer( buffer );
- }
- if (buffer->UseSoftwareAccumBuffer) {
- _swrast_alloc_accum_buffer( buffer );
- }
- if (buffer->UseSoftwareAlphaBuffers) {
- _swrast_alloc_alpha_buffers( buffer );
- }
-}
-
-
-/*
- * Fallback for ctx->Driver.DrawBuffer()
- */
-void
-_swrast_DrawBuffer( GLcontext *ctx, GLenum mode )
-{
- _swrast_use_draw_buffer(ctx);
-}
-
-
-/*
- * Setup things so that we read/write spans from the user-designated
- * read buffer (set via glReadPixels). We usually just have to call
- * this for glReadPixels, glCopyPixels, etc.
- */
-void
-_swrast_use_read_buffer( GLcontext *ctx )
-{
- SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
- /* Do this so the software-emulated alpha plane span functions work! */
- swrast->CurrentBuffer = ctx->Pixel._ReadSrcMask;
- /* Tell the device driver where to read/write spans */
- (*swrast->Driver.SetBuffer)( ctx, ctx->ReadBuffer, swrast->CurrentBuffer );
-}
-
-
-/*
- * Setup things so that we read/write spans from the default draw buffer.
- * This is the usual mode that Mesa's software rasterizer operates in.
- */
-void
-_swrast_use_draw_buffer( GLcontext *ctx )
-{
- SWcontext *swrast = SWRAST_CONTEXT(ctx);
-
- /* The user can specify rendering to zero, one, two, or four color
- * buffers simultaneously with glDrawBuffer()!
- * We don't expect the span/point/line/triangle functions to deal with
- * that mess so we'll iterate over the multiple buffers as needed.
- * But usually we only render to one color buffer at a time.
- * We set ctx->Color._DriverDrawBuffer to that buffer and tell the
- * device driver to use that buffer.
- * Look in s_span.c's multi_write_rgba_span() function to see how
- * we loop over multiple color buffers when needed.
- */
-
- if (ctx->Color._DrawDestMask & FRONT_LEFT_BIT)
- swrast->CurrentBuffer = FRONT_LEFT_BIT;
- else if (ctx->Color._DrawDestMask & BACK_LEFT_BIT)
- swrast->CurrentBuffer = BACK_LEFT_BIT;
- else if (ctx->Color._DrawDestMask & FRONT_RIGHT_BIT)
- swrast->CurrentBuffer = FRONT_RIGHT_BIT;
- else if (ctx->Color._DrawDestMask & BACK_RIGHT_BIT)
- swrast->CurrentBuffer = BACK_RIGHT_BIT;
- else
- /* glDrawBuffer(GL_NONE) */
- swrast->CurrentBuffer = FRONT_LEFT_BIT; /* we always have this buffer */
-
- (*swrast->Driver.SetBuffer)( ctx, ctx->DrawBuffer, swrast->CurrentBuffer );
-}
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