-/* $Id: accum.c,v 1.32 2000/11/22 07:32:16 joukj Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 3.5
+ * Version: 6.5
*
- * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2005 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"),
* 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
+ * THE AUTHORS 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.
*/
-
-#ifdef PC_HEADER
-#include "all.h"
-#else
#include "glheader.h"
#include "accum.h"
+#include "condrender.h"
#include "context.h"
+#include "format_unpack.h"
+#include "format_pack.h"
+#include "imports.h"
#include "macros.h"
-#include "mem.h"
#include "state.h"
#include "mtypes.h"
-#include "swrast/swrast.h"
-#endif
-
-
+#include "main/dispatch.h"
-void
+void GLAPIENTRY
_mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha )
{
+ GLfloat tmp[4];
GET_CURRENT_CONTEXT(ctx);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glAccum");
- ctx->Accum.ClearColor[0] = CLAMP( red, -1.0, 1.0 );
- ctx->Accum.ClearColor[1] = CLAMP( green, -1.0, 1.0 );
- ctx->Accum.ClearColor[2] = CLAMP( blue, -1.0, 1.0 );
- ctx->Accum.ClearColor[3] = CLAMP( alpha, -1.0, 1.0 );
- ctx->NewState |= _NEW_ACCUM;
+ tmp[0] = CLAMP( red, -1.0F, 1.0F );
+ tmp[1] = CLAMP( green, -1.0F, 1.0F );
+ tmp[2] = CLAMP( blue, -1.0F, 1.0F );
+ tmp[3] = CLAMP( alpha, -1.0F, 1.0F );
+
+ if (TEST_EQ_4V(tmp, ctx->Accum.ClearColor))
+ return;
+
+ COPY_4FV( ctx->Accum.ClearColor, tmp );
}
-void
+void GLAPIENTRY
_mesa_Accum( GLenum op, GLfloat value )
{
GET_CURRENT_CONTEXT(ctx);
- GLuint xpos, ypos, width, height;
+ FLUSH_VERTICES(ctx, 0);
- ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glAccum");
+ switch (op) {
+ case GL_ADD:
+ case GL_MULT:
+ case GL_ACCUM:
+ case GL_LOAD:
+ case GL_RETURN:
+ /* OK */
+ break;
+ default:
+ _mesa_error(ctx, GL_INVALID_ENUM, "glAccum(op)");
+ return;
+ }
- if (ctx->Visual.AccumRedBits == 0 || ctx->DrawBuffer != ctx->ReadBuffer) {
- gl_error(ctx, GL_INVALID_OPERATION, "glAccum");
+ if (ctx->DrawBuffer->Visual.haveAccumBuffer == 0) {
+ _mesa_error(ctx, GL_INVALID_OPERATION, "glAccum(no accum buffer)");
+ return;
+ }
+
+ if (ctx->DrawBuffer != ctx->ReadBuffer) {
+ /* See GLX_SGI_make_current_read or WGL_ARB_make_current_read,
+ * or GL_EXT_framebuffer_blit.
+ */
+ _mesa_error(ctx, GL_INVALID_OPERATION,
+ "glAccum(different read/draw buffers)");
return;
}
if (ctx->NewState)
- gl_update_state( ctx );
+ _mesa_update_state(ctx);
+
+ if (ctx->DrawBuffer->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
+ _mesa_error(ctx, GL_INVALID_FRAMEBUFFER_OPERATION_EXT,
+ "glAccum(incomplete framebuffer)");
+ return;
+ }
+
+ if (ctx->RasterDiscard)
+ return;
+
+ if (ctx->RenderMode == GL_RENDER) {
+ _mesa_accum(ctx, op, value);
+ }
+}
+
+
+/**
+ * Clear the accumulation buffer by mapping the renderbuffer and
+ * writing the clear color to it. Called by the driver's implementation
+ * of the glClear function.
+ */
+void
+_mesa_clear_accum_buffer(struct gl_context *ctx)
+{
+ GLuint x, y, width, height;
+ GLubyte *accMap;
+ GLint accRowStride;
+ struct gl_renderbuffer *accRb;
+
+ if (!ctx->DrawBuffer)
+ return;
+
+ accRb = ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
+ if (!accRb)
+ return; /* missing accum buffer, not an error */
- /* Determine region to operate upon. */
- if (ctx->Scissor.Enabled) {
- xpos = ctx->Scissor.X;
- ypos = ctx->Scissor.Y;
- width = ctx->Scissor.Width;
- height = ctx->Scissor.Height;
+ /* bounds, with scissor */
+ x = ctx->DrawBuffer->_Xmin;
+ y = ctx->DrawBuffer->_Ymin;
+ width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
+ height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
+
+ ctx->Driver.MapRenderbuffer(ctx, accRb, x, y, width, height,
+ GL_MAP_WRITE_BIT, &accMap, &accRowStride);
+
+ if (!accMap) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
+ return;
+ }
+
+ if (accRb->Format == MESA_FORMAT_SIGNED_RGBA_16) {
+ const GLshort clearR = FLOAT_TO_SHORT(ctx->Accum.ClearColor[0]);
+ const GLshort clearG = FLOAT_TO_SHORT(ctx->Accum.ClearColor[1]);
+ const GLshort clearB = FLOAT_TO_SHORT(ctx->Accum.ClearColor[2]);
+ const GLshort clearA = FLOAT_TO_SHORT(ctx->Accum.ClearColor[3]);
+ GLuint i, j;
+
+ for (j = 0; j < height; j++) {
+ GLshort *row = (GLshort *) accMap;
+
+ for (i = 0; i < width; i++) {
+ row[i * 4 + 0] = clearR;
+ row[i * 4 + 1] = clearG;
+ row[i * 4 + 2] = clearB;
+ row[i * 4 + 3] = clearA;
+ }
+ accMap += accRowStride;
+ }
+ }
+ else {
+ /* other types someday? */
+ _mesa_warning(ctx, "unexpected accum buffer type");
+ }
+
+ ctx->Driver.UnmapRenderbuffer(ctx, accRb);
+}
+
+
+/**
+ * if (bias)
+ * Accum += value
+ * else
+ * Accum *= value
+ */
+static void
+accum_scale_or_bias(struct gl_context *ctx, GLfloat value,
+ GLint xpos, GLint ypos, GLint width, GLint height,
+ GLboolean bias)
+{
+ struct gl_renderbuffer *accRb =
+ ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
+ GLubyte *accMap;
+ GLint accRowStride;
+
+ assert(accRb);
+
+ ctx->Driver.MapRenderbuffer(ctx, accRb, xpos, ypos, width, height,
+ GL_MAP_READ_BIT | GL_MAP_WRITE_BIT,
+ &accMap, &accRowStride);
+
+ if (!accMap) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
+ return;
+ }
+
+ if (accRb->Format == MESA_FORMAT_SIGNED_RGBA_16) {
+ const GLshort incr = (GLshort) (value * 32767.0f);
+ GLint i, j;
+ if (bias) {
+ for (j = 0; j < height; j++) {
+ GLshort *acc = (GLshort *) accMap;
+ for (i = 0; i < 4 * width; i++) {
+ acc[i] += incr;
+ }
+ accMap += accRowStride;
+ }
+ }
+ else {
+ /* scale */
+ for (j = 0; j < height; j++) {
+ GLshort *acc = (GLshort *) accMap;
+ for (i = 0; i < 4 * width; i++) {
+ acc[i] = (GLshort) (acc[i] * value);
+ }
+ accMap += accRowStride;
+ }
+ }
}
else {
- /* whole window */
- xpos = 0;
- ypos = 0;
- width = ctx->DrawBuffer->Width;
- height = ctx->DrawBuffer->Height;
+ /* other types someday? */
+ }
+
+ ctx->Driver.UnmapRenderbuffer(ctx, accRb);
+}
+
+
+/**
+ * if (load)
+ * Accum = ColorBuf * value
+ * else
+ * Accum += ColorBuf * value
+ */
+static void
+accum_or_load(struct gl_context *ctx, GLfloat value,
+ GLint xpos, GLint ypos, GLint width, GLint height,
+ GLboolean load)
+{
+ struct gl_renderbuffer *accRb =
+ ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer;
+ struct gl_renderbuffer *colorRb = ctx->ReadBuffer->_ColorReadBuffer;
+ GLubyte *accMap, *colorMap;
+ GLint accRowStride, colorRowStride;
+ GLbitfield mappingFlags;
+
+ if (!colorRb) {
+ /* no read buffer - OK */
+ return;
}
- if (!ctx->Driver.Accum ||
- !ctx->Driver.Accum( ctx, op, value, xpos, ypos, width, height ))
- _swrast_Accum( ctx, op, value, xpos, ypos, width, height );
+ assert(accRb);
+
+ mappingFlags = GL_MAP_WRITE_BIT;
+ if (!load) /* if we're accumulating */
+ mappingFlags |= GL_MAP_READ_BIT;
+
+ /* Map accum buffer */
+ ctx->Driver.MapRenderbuffer(ctx, accRb, xpos, ypos, width, height,
+ mappingFlags, &accMap, &accRowStride);
+ if (!accMap) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
+ return;
+ }
+
+ /* Map color buffer */
+ ctx->Driver.MapRenderbuffer(ctx, colorRb, xpos, ypos, width, height,
+ GL_MAP_READ_BIT,
+ &colorMap, &colorRowStride);
+ if (!colorMap) {
+ ctx->Driver.UnmapRenderbuffer(ctx, accRb);
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
+ return;
+ }
+
+ if (accRb->Format == MESA_FORMAT_SIGNED_RGBA_16) {
+ const GLfloat scale = value * 32767.0f;
+ GLint i, j;
+ GLfloat (*rgba)[4];
+
+ rgba = malloc(width * 4 * sizeof(GLfloat));
+ if (rgba) {
+ for (j = 0; j < height; j++) {
+ GLshort *acc = (GLshort *) accMap;
+
+ /* read colors from source color buffer */
+ _mesa_unpack_rgba_row(colorRb->Format, width, colorMap, rgba);
+
+ if (load) {
+ for (i = 0; i < width; i++) {
+ acc[i * 4 + 0] = (GLshort) (rgba[i][RCOMP] * scale);
+ acc[i * 4 + 1] = (GLshort) (rgba[i][GCOMP] * scale);
+ acc[i * 4 + 2] = (GLshort) (rgba[i][BCOMP] * scale);
+ acc[i * 4 + 3] = (GLshort) (rgba[i][ACOMP] * scale);
+ }
+ }
+ else {
+ /* accumulate */
+ for (i = 0; i < width; i++) {
+ acc[i * 4 + 0] += (GLshort) (rgba[i][RCOMP] * scale);
+ acc[i * 4 + 1] += (GLshort) (rgba[i][GCOMP] * scale);
+ acc[i * 4 + 2] += (GLshort) (rgba[i][BCOMP] * scale);
+ acc[i * 4 + 3] += (GLshort) (rgba[i][ACOMP] * scale);
+ }
+ }
+
+ colorMap += colorRowStride;
+ accMap += accRowStride;
+ }
+
+ free(rgba);
+ }
+ else {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
+ }
+ }
+ else {
+ /* other types someday? */
+ }
+
+ ctx->Driver.UnmapRenderbuffer(ctx, accRb);
+ ctx->Driver.UnmapRenderbuffer(ctx, colorRb);
+}
+
+
+/**
+ * ColorBuffer = Accum * value
+ */
+static void
+accum_return(struct gl_context *ctx, GLfloat value,
+ GLint xpos, GLint ypos, GLint width, GLint height)
+{
+ struct gl_framebuffer *fb = ctx->DrawBuffer;
+ struct gl_renderbuffer *accRb = fb->Attachment[BUFFER_ACCUM].Renderbuffer;
+ GLubyte *accMap, *colorMap;
+ GLint accRowStride, colorRowStride;
+ GLuint buffer;
+
+ /* Map accum buffer */
+ ctx->Driver.MapRenderbuffer(ctx, accRb, xpos, ypos, width, height,
+ GL_MAP_READ_BIT,
+ &accMap, &accRowStride);
+ if (!accMap) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
+ return;
+ }
+
+ /* Loop over destination buffers */
+ for (buffer = 0; buffer < fb->_NumColorDrawBuffers; buffer++) {
+ struct gl_renderbuffer *colorRb = fb->_ColorDrawBuffers[buffer];
+ const GLboolean masking = (!ctx->Color.ColorMask[buffer][RCOMP] ||
+ !ctx->Color.ColorMask[buffer][GCOMP] ||
+ !ctx->Color.ColorMask[buffer][BCOMP] ||
+ !ctx->Color.ColorMask[buffer][ACOMP]);
+ GLbitfield mappingFlags = GL_MAP_WRITE_BIT;
+
+ if (masking)
+ mappingFlags |= GL_MAP_READ_BIT;
+
+ /* Map color buffer */
+ ctx->Driver.MapRenderbuffer(ctx, colorRb, xpos, ypos, width, height,
+ mappingFlags, &colorMap, &colorRowStride);
+ if (!colorMap) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
+ continue;
+ }
+
+ if (accRb->Format == MESA_FORMAT_SIGNED_RGBA_16) {
+ const GLfloat scale = value / 32767.0f;
+ GLint i, j;
+ GLfloat (*rgba)[4], (*dest)[4];
+
+ rgba = malloc(width * 4 * sizeof(GLfloat));
+ dest = malloc(width * 4 * sizeof(GLfloat));
+
+ if (rgba && dest) {
+ for (j = 0; j < height; j++) {
+ GLshort *acc = (GLshort *) accMap;
+
+ for (i = 0; i < width; i++) {
+ rgba[i][0] = acc[i * 4 + 0] * scale;
+ rgba[i][1] = acc[i * 4 + 1] * scale;
+ rgba[i][2] = acc[i * 4 + 2] * scale;
+ rgba[i][3] = acc[i * 4 + 3] * scale;
+ }
+
+ if (masking) {
+
+ /* get existing colors from dest buffer */
+ _mesa_unpack_rgba_row(colorRb->Format, width, colorMap, dest);
+
+ /* use the dest colors where mask[channel] = 0 */
+ if (ctx->Color.ColorMask[buffer][RCOMP] == 0) {
+ for (i = 0; i < width; i++)
+ rgba[i][RCOMP] = dest[i][RCOMP];
+ }
+ if (ctx->Color.ColorMask[buffer][GCOMP] == 0) {
+ for (i = 0; i < width; i++)
+ rgba[i][GCOMP] = dest[i][GCOMP];
+ }
+ if (ctx->Color.ColorMask[buffer][BCOMP] == 0) {
+ for (i = 0; i < width; i++)
+ rgba[i][BCOMP] = dest[i][BCOMP];
+ }
+ if (ctx->Color.ColorMask[buffer][ACOMP] == 0) {
+ for (i = 0; i < width; i++)
+ rgba[i][ACOMP] = dest[i][ACOMP];
+ }
+ }
+
+ _mesa_pack_float_rgba_row(colorRb->Format, width,
+ (const GLfloat (*)[4]) rgba, colorMap);
+
+ accMap += accRowStride;
+ colorMap += colorRowStride;
+ }
+ }
+ else {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY, "glAccum");
+ }
+ free(rgba);
+ free(dest);
+ }
+ else {
+ /* other types someday? */
+ }
+
+ ctx->Driver.UnmapRenderbuffer(ctx, colorRb);
+ }
+
+ ctx->Driver.UnmapRenderbuffer(ctx, accRb);
+}
+
+
+
+/**
+ * Software fallback for glAccum. A hardware driver that supports
+ * signed 16-bit color channels could implement hardware accumulation
+ * operations, but no driver does so at this time.
+ */
+void
+_mesa_accum(struct gl_context *ctx, GLenum op, GLfloat value)
+{
+ GLint xpos, ypos, width, height;
+
+ if (!ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer) {
+ _mesa_warning(ctx, "Calling glAccum() without an accumulation buffer");
+ return;
+ }
+
+ if (!_mesa_check_conditional_render(ctx))
+ return;
+
+ xpos = ctx->DrawBuffer->_Xmin;
+ ypos = ctx->DrawBuffer->_Ymin;
+ width = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
+ height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
+
+ switch (op) {
+ case GL_ADD:
+ if (value != 0.0F) {
+ accum_scale_or_bias(ctx, value, xpos, ypos, width, height, GL_TRUE);
+ }
+ break;
+ case GL_MULT:
+ if (value != 1.0F) {
+ accum_scale_or_bias(ctx, value, xpos, ypos, width, height, GL_FALSE);
+ }
+ break;
+ case GL_ACCUM:
+ if (value != 0.0F) {
+ accum_or_load(ctx, value, xpos, ypos, width, height, GL_FALSE);
+ }
+ break;
+ case GL_LOAD:
+ accum_or_load(ctx, value, xpos, ypos, width, height, GL_TRUE);
+ break;
+ case GL_RETURN:
+ accum_return(ctx, value, xpos, ypos, width, height);
+ break;
+ default:
+ _mesa_problem(ctx, "invalid mode in _mesa_accum()");
+ break;
+ }
+}
+
+
+void
+_mesa_init_accum( struct gl_context *ctx )
+{
+ /* Accumulate buffer group */
+ ASSIGN_4V( ctx->Accum.ClearColor, 0.0, 0.0, 0.0, 0.0 );
}
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