From 724abeb058ca9372c5a9b9e38ee43dde1accaa41 Mon Sep 17 00:00:00 2001 From: Keith Whitwell Date: Tue, 31 Oct 2000 18:09:44 +0000 Subject: Moved the software rasterizer to a new directory. --- src/mesa/main/accum.c | 459 +------------------------------------------------- 1 file changed, 6 insertions(+), 453 deletions(-) (limited to 'src/mesa/main/accum.c') diff --git a/src/mesa/main/accum.c b/src/mesa/main/accum.c index a2c8d04880..a43472fb59 100644 --- a/src/mesa/main/accum.c +++ b/src/mesa/main/accum.c @@ -1,4 +1,4 @@ -/* $Id: accum.c,v 1.30 2000/10/30 13:31:59 keithw Exp $ */ +/* $Id: accum.c,v 1.31 2000/10/31 18:09:44 keithw Exp $ */ /* * Mesa 3-D graphics library @@ -33,68 +33,12 @@ #include "context.h" #include "macros.h" #include "mem.h" -#include "masking.h" -#include "span.h" #include "state.h" #include "types.h" +#include "swrast/swrast.h" #endif -/* - * Accumulation buffer notes - * - * Normally, accumulation buffer values are GLshorts with values in - * [-32767, 32767] which represent floating point colors in [-1, 1], - * as suggested by the OpenGL specification. - * - * We optimize for the common case used for full-scene antialiasing: - * // start with accum buffer cleared to zero - * glAccum(GL_LOAD, w); // or GL_ACCUM the first image - * glAccum(GL_ACCUM, w); - * ... - * glAccum(GL_ACCUM, w); - * glAccum(GL_RETURN, 1.0); - * That is, we start with an empty accumulation buffer and accumulate - * n images, each with weight w = 1/n. - * In this scenario, we can simply store unscaled integer values in - * the accum buffer instead of scaled integers. We'll also keep track - * of the w value so when we do GL_RETURN we simply divide the accumulated - * values by n (=1/w). - * This lets us avoid _many_ int->float->int conversions. - */ - - -#if CHAN_BITS == 8 -#define USE_OPTIMIZED_ACCUM /* enable the optimization */ -#endif - - - -void -_mesa_alloc_accum_buffer( GLcontext *ctx ) -{ - GLint n; - - if (ctx->DrawBuffer->Accum) { - FREE( ctx->DrawBuffer->Accum ); - ctx->DrawBuffer->Accum = NULL; - } - - /* allocate accumulation buffer if not already present */ - n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height * 4 * sizeof(GLaccum); - ctx->DrawBuffer->Accum = (GLaccum *) MALLOC( n ); - if (!ctx->DrawBuffer->Accum) { - /* unable to setup accumulation buffer */ - gl_error( ctx, GL_OUT_OF_MEMORY, "glAccum" ); - } -#ifdef USE_OPTIMIZED_ACCUM - ctx->IntegerAccumMode = GL_TRUE; -#else - ctx->IntegerAccumMode = GL_FALSE; -#endif - ctx->IntegerAccumScaler = 0.0; -} - void @@ -111,42 +55,11 @@ _mesa_ClearAccum( GLfloat red, GLfloat green, GLfloat blue, GLfloat alpha ) } - -/* - * This is called when we fall out of optimized/unscaled accum buffer mode. - * That is, we convert each unscaled accum buffer value into a scaled value - * representing the range[-1, 1]. - */ -static void rescale_accum( GLcontext *ctx ) -{ - const GLuint n = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height * 4; - const GLfloat fChanMax = (1 << (sizeof(GLchan) * 8)) - 1; - const GLfloat s = ctx->IntegerAccumScaler * (32767.0 / fChanMax); - GLaccum *accum = ctx->DrawBuffer->Accum; - GLuint i; - - assert(ctx->IntegerAccumMode); - assert(accum); - - for (i = 0; i < n; i++) { - accum[i] = (GLaccum) (accum[i] * s); - } - - ctx->IntegerAccumMode = GL_FALSE; -} - - - void _mesa_Accum( GLenum op, GLfloat value ) { GET_CURRENT_CONTEXT(ctx); - GLuint xpos, ypos, width, height, width4; - GLfloat acc_scale; - GLchan rgba[MAX_WIDTH][4]; - const GLuint colorMask = *((GLuint *) &ctx->Color.ColorMask); - const GLint iChanMax = (1 << (sizeof(GLchan) * 8)) - 1; - const GLfloat fChanMax = (1 << (sizeof(GLchan) * 8)) - 1; + GLuint xpos, ypos, width, height; ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glAccum"); @@ -155,22 +68,6 @@ _mesa_Accum( GLenum op, GLfloat value ) return; } - if (!ctx->DrawBuffer->Accum) { - _mesa_warning(ctx, "Calling glAccum() without an accumulation buffer (low memory?)"); - return; - } - - if (sizeof(GLaccum)==1) { - acc_scale = 127.0; - } - else if (sizeof(GLaccum)==2) { - acc_scale = 32767.0; - } - else { - /* sizeof(GLaccum) > 2 (Cray) */ - acc_scale = (float) SHRT_MAX; - } - if (ctx->NewState) gl_update_state( ctx ); @@ -189,351 +86,7 @@ _mesa_Accum( GLenum op, GLfloat value ) height = ctx->DrawBuffer->Height; } - width4 = 4 * width; - - switch (op) { - case GL_ADD: - if (value != 0.0F) { - const GLaccum intVal = (GLaccum) (value * acc_scale); - GLuint j; - /* Leave optimized accum buffer mode */ - if (ctx->IntegerAccumMode) - rescale_accum(ctx); - for (j = 0; j < height; j++) { - GLaccum * acc = ctx->DrawBuffer->Accum + ypos * width4 + 4 * xpos; - GLuint i; - for (i = 0; i < width4; i++) { - acc[i] += intVal; - } - ypos++; - } - } - break; - - case GL_MULT: - if (value != 1.0F) { - GLuint j; - /* Leave optimized accum buffer mode */ - if (ctx->IntegerAccumMode) - rescale_accum(ctx); - for (j = 0; j < height; j++) { - GLaccum *acc = ctx->DrawBuffer->Accum + ypos * width4 + 4 * xpos; - GLuint i; - for (i = 0; i < width4; i++) { - acc[i] = (GLaccum) ( (GLfloat) acc[i] * value ); - } - ypos++; - } - } - break; - - case GL_ACCUM: - if (value == 0.0F) - return; - - (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer, - ctx->Pixel.DriverReadBuffer ); - - /* May have to leave optimized accum buffer mode */ - if (ctx->IntegerAccumScaler == 0.0 && value > 0.0 && value <= 1.0) - ctx->IntegerAccumScaler = value; - if (ctx->IntegerAccumMode && value != ctx->IntegerAccumScaler) - rescale_accum(ctx); - - RENDER_START(ctx); - - if (ctx->IntegerAccumMode) { - /* simply add integer color values into accum buffer */ - GLuint j; - GLaccum *acc = ctx->DrawBuffer->Accum + ypos * width4 + xpos * 4; - assert(ctx->IntegerAccumScaler > 0.0); - assert(ctx->IntegerAccumScaler <= 1.0); - for (j = 0; j < height; j++) { - - GLuint i, i4; - gl_read_rgba_span(ctx, ctx->DrawBuffer, width, xpos, ypos, rgba); - for (i = i4 = 0; i < width; i++, i4+=4) { - acc[i4+0] += rgba[i][RCOMP]; - acc[i4+1] += rgba[i][GCOMP]; - acc[i4+2] += rgba[i][BCOMP]; - acc[i4+3] += rgba[i][ACOMP]; - } - acc += width4; - ypos++; - } - } - else { - /* scaled integer accum buffer */ - const GLfloat rscale = value * acc_scale / fChanMax; - const GLfloat gscale = value * acc_scale / fChanMax; - const GLfloat bscale = value * acc_scale / fChanMax; - const GLfloat ascale = value * acc_scale / fChanMax; - GLuint j; - for (j=0;jDrawBuffer->Accum + ypos * width4 + xpos * 4; - GLuint i; - gl_read_rgba_span(ctx, ctx->DrawBuffer, width, xpos, ypos, rgba); - for (i=0;iDriver.SetReadBuffer)( ctx, ctx->DrawBuffer, - ctx->Color.DriverDrawBuffer ); - RENDER_FINISH(ctx); - break; - - case GL_LOAD: - (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer, - ctx->Pixel.DriverReadBuffer ); - - /* This is a change to go into optimized accum buffer mode */ - if (value > 0.0 && value <= 1.0) { -#ifdef USE_OPTIMIZED_ACCUM - ctx->IntegerAccumMode = GL_TRUE; -#else - ctx->IntegerAccumMode = GL_FALSE; -#endif - ctx->IntegerAccumScaler = value; - } - else { - ctx->IntegerAccumMode = GL_FALSE; - ctx->IntegerAccumScaler = 0.0; - } - - RENDER_START(ctx); - if (ctx->IntegerAccumMode) { - /* just copy values into accum buffer */ - GLuint j; - GLaccum *acc = ctx->DrawBuffer->Accum + ypos * width4 + xpos * 4; - assert(ctx->IntegerAccumScaler > 0.0); - assert(ctx->IntegerAccumScaler <= 1.0); - for (j = 0; j < height; j++) { - GLuint i, i4; - gl_read_rgba_span(ctx, ctx->DrawBuffer, width, xpos, ypos, rgba); - for (i = i4 = 0; i < width; i++, i4 += 4) { - acc[i4+0] = rgba[i][RCOMP]; - acc[i4+1] = rgba[i][GCOMP]; - acc[i4+2] = rgba[i][BCOMP]; - acc[i4+3] = rgba[i][ACOMP]; - } - acc += width4; - ypos++; - } - } - else { - /* scaled integer accum buffer */ - const GLfloat rscale = value * acc_scale / fChanMax; - const GLfloat gscale = value * acc_scale / fChanMax; - const GLfloat bscale = value * acc_scale / fChanMax; - const GLfloat ascale = value * acc_scale / fChanMax; - const GLfloat d = 3.0 / acc_scale; - GLuint i, j; - for (j = 0; j < height; j++) { - GLaccum *acc = ctx->DrawBuffer->Accum + ypos * width4 + xpos * 4; - gl_read_rgba_span(ctx, ctx->DrawBuffer, width, xpos, ypos, rgba); - for (i=0;iDriver.SetReadBuffer)( ctx, ctx->DrawBuffer, - ctx->Color.DriverDrawBuffer ); - RENDER_FINISH(ctx); - break; - - case GL_RETURN: - /* May have to leave optimized accum buffer mode */ - if (ctx->IntegerAccumMode && value != 1.0) - rescale_accum(ctx); - - RENDER_START(ctx); - if (ctx->IntegerAccumMode && ctx->IntegerAccumScaler > 0) { - /* build lookup table to avoid many floating point multiplies */ - static GLchan multTable[32768]; - static GLfloat prevMult = 0.0; - const GLfloat mult = ctx->IntegerAccumScaler; - const GLint max = MIN2((GLint) (256 / mult), 32767); - GLuint j; - if (mult != prevMult) { - for (j = 0; j < max; j++) - multTable[j] = (GLint) ((GLfloat) j * mult + 0.5F); - prevMult = mult; - } - - assert(ctx->IntegerAccumScaler > 0.0); - assert(ctx->IntegerAccumScaler <= 1.0); - for (j = 0; j < height; j++) { - const GLaccum *acc = ctx->DrawBuffer->Accum + ypos * width4 + xpos*4; - GLuint i, i4; - for (i = i4 = 0; i < width; i++, i4 += 4) { - ASSERT(acc[i4+0] < max); - ASSERT(acc[i4+1] < max); - ASSERT(acc[i4+2] < max); - ASSERT(acc[i4+3] < max); - rgba[i][RCOMP] = multTable[acc[i4+0]]; - rgba[i][GCOMP] = multTable[acc[i4+1]]; - rgba[i][BCOMP] = multTable[acc[i4+2]]; - rgba[i][ACOMP] = multTable[acc[i4+3]]; - } - if (colorMask != 0xffffffff) { - _mesa_mask_rgba_span( ctx, width, xpos, ypos, rgba ); - } - (*ctx->Driver.WriteRGBASpan)( ctx, width, xpos, ypos, - (const GLchan (*)[4])rgba, NULL ); - ypos++; - } - } - else { - const GLfloat rscale = value / acc_scale * fChanMax; - const GLfloat gscale = value / acc_scale * fChanMax; - const GLfloat bscale = value / acc_scale * fChanMax; - const GLfloat ascale = value / acc_scale * fChanMax; - GLuint i, j; - for (j=0;jDrawBuffer->Accum + ypos * width4 + xpos*4; - for (i=0;iDriver.WriteRGBASpan)( ctx, width, xpos, ypos, - (const GLchan (*)[4])rgba, NULL ); - ypos++; - } - } - RENDER_FINISH(ctx); - break; - - default: - gl_error( ctx, GL_INVALID_ENUM, "glAccum" ); - } -} - - - -/* - * Clear the accumulation Buffer. - */ -void -_mesa_clear_accum_buffer( GLcontext *ctx ) -{ - GLuint buffersize; - GLfloat acc_scale; - - if (ctx->Visual.AccumRedBits==0) { - /* No accumulation buffer! */ - return; - } - - if (sizeof(GLaccum)==1) { - acc_scale = 127.0; - } - else if (sizeof(GLaccum)==2) { - acc_scale = 32767.0; - } - else { - /* sizeof(GLaccum) > 2 (Cray) */ - acc_scale = (float) SHRT_MAX; - } - - /* number of pixels */ - buffersize = ctx->DrawBuffer->Width * ctx->DrawBuffer->Height; - - if (!ctx->DrawBuffer->Accum) { - /* try to alloc accumulation buffer */ - ctx->DrawBuffer->Accum = (GLaccum *) - MALLOC( buffersize * 4 * sizeof(GLaccum) ); - } - - if (ctx->DrawBuffer->Accum) { - if (ctx->Scissor.Enabled) { - /* Limit clear to scissor box */ - GLaccum r, g, b, a; - GLint i, j; - GLint width, height; - GLaccum *row; - r = (GLaccum) (ctx->Accum.ClearColor[0] * acc_scale); - g = (GLaccum) (ctx->Accum.ClearColor[1] * acc_scale); - b = (GLaccum) (ctx->Accum.ClearColor[2] * acc_scale); - a = (GLaccum) (ctx->Accum.ClearColor[3] * acc_scale); - /* size of region to clear */ - width = 4 * (ctx->DrawBuffer->Xmax - ctx->DrawBuffer->Xmin); - height = ctx->DrawBuffer->Ymax - ctx->DrawBuffer->Ymin; - /* ptr to first element to clear */ - row = ctx->DrawBuffer->Accum - + 4 * (ctx->DrawBuffer->Ymin * ctx->DrawBuffer->Width - + ctx->DrawBuffer->Xmin); - for (j=0;jDrawBuffer->Width; - } - } - else { - /* clear whole buffer */ - if (ctx->Accum.ClearColor[0]==0.0 && - ctx->Accum.ClearColor[1]==0.0 && - ctx->Accum.ClearColor[2]==0.0 && - ctx->Accum.ClearColor[3]==0.0) { - /* Black */ - BZERO( ctx->DrawBuffer->Accum, buffersize * 4 * sizeof(GLaccum) ); - } - else { - /* Not black */ - GLaccum *acc, r, g, b, a; - GLuint i; - - acc = ctx->DrawBuffer->Accum; - r = (GLaccum) (ctx->Accum.ClearColor[0] * acc_scale); - g = (GLaccum) (ctx->Accum.ClearColor[1] * acc_scale); - b = (GLaccum) (ctx->Accum.ClearColor[2] * acc_scale); - a = (GLaccum) (ctx->Accum.ClearColor[3] * acc_scale); - for (i=0;iAccum.ClearColor[0] == 0.0 && ctx->Accum.ClearColor[1] == 0.0 && - ctx->Accum.ClearColor[2] == 0.0 && ctx->Accum.ClearColor[3] == 0.0) { -#ifdef USE_OPTIMIZED_ACCUM - ctx->IntegerAccumMode = GL_TRUE; -#else - ctx->IntegerAccumMode = GL_FALSE; -#endif - ctx->IntegerAccumScaler = 0.0; /* denotes empty accum buffer */ - } - else { - ctx->IntegerAccumMode = GL_FALSE; - } - } + if (!ctx->Driver.Accum || + !ctx->Driver.Accum( ctx, op, value, xpos, ypos, width, height )) + _swrast_Accum( ctx, op, value, xpos, ypos, width, height ); } -- cgit v1.2.3