mirror of
https://github.com/reactos/reactos.git
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300 lines
9.2 KiB
C
300 lines
9.2 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
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* Copyright (C) 2009-2010 VMware, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file pixeltransfer.c
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* Pixel transfer operations (scale, bias, table lookups, etc)
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*/
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#include <precomp.h>
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/*
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* Apply scale and bias factors to an array of RGBA pixels.
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*/
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void
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_mesa_scale_and_bias_rgba(GLuint n, GLfloat rgba[][4],
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GLfloat rScale, GLfloat gScale,
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GLfloat bScale, GLfloat aScale,
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GLfloat rBias, GLfloat gBias,
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GLfloat bBias, GLfloat aBias)
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{
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if (rScale != 1.0 || rBias != 0.0) {
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GLuint i;
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for (i = 0; i < n; i++) {
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rgba[i][RCOMP] = rgba[i][RCOMP] * rScale + rBias;
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}
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}
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if (gScale != 1.0 || gBias != 0.0) {
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GLuint i;
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for (i = 0; i < n; i++) {
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rgba[i][GCOMP] = rgba[i][GCOMP] * gScale + gBias;
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}
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}
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if (bScale != 1.0 || bBias != 0.0) {
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GLuint i;
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for (i = 0; i < n; i++) {
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rgba[i][BCOMP] = rgba[i][BCOMP] * bScale + bBias;
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}
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}
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if (aScale != 1.0 || aBias != 0.0) {
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GLuint i;
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for (i = 0; i < n; i++) {
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rgba[i][ACOMP] = rgba[i][ACOMP] * aScale + aBias;
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}
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}
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}
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/*
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* Apply pixel mapping to an array of floating point RGBA pixels.
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*/
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void
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_mesa_map_rgba( const struct gl_context *ctx, GLuint n, GLfloat rgba[][4] )
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{
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const GLfloat rscale = (GLfloat) (ctx->PixelMaps.RtoR.Size - 1);
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const GLfloat gscale = (GLfloat) (ctx->PixelMaps.GtoG.Size - 1);
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const GLfloat bscale = (GLfloat) (ctx->PixelMaps.BtoB.Size - 1);
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const GLfloat ascale = (GLfloat) (ctx->PixelMaps.AtoA.Size - 1);
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const GLfloat *rMap = ctx->PixelMaps.RtoR.Map;
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const GLfloat *gMap = ctx->PixelMaps.GtoG.Map;
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const GLfloat *bMap = ctx->PixelMaps.BtoB.Map;
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const GLfloat *aMap = ctx->PixelMaps.AtoA.Map;
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GLuint i;
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for (i=0;i<n;i++) {
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GLfloat r = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
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GLfloat g = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
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GLfloat b = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
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GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
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rgba[i][RCOMP] = rMap[IROUND(r * rscale)];
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rgba[i][GCOMP] = gMap[IROUND(g * gscale)];
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rgba[i][BCOMP] = bMap[IROUND(b * bscale)];
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rgba[i][ACOMP] = aMap[IROUND(a * ascale)];
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}
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}
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/*
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* Map color indexes to float rgba values.
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*/
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void
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_mesa_map_ci_to_rgba( const struct gl_context *ctx, GLuint n,
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const GLuint index[], GLfloat rgba[][4] )
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{
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GLuint rmask = ctx->PixelMaps.ItoR.Size - 1;
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GLuint gmask = ctx->PixelMaps.ItoG.Size - 1;
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GLuint bmask = ctx->PixelMaps.ItoB.Size - 1;
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GLuint amask = ctx->PixelMaps.ItoA.Size - 1;
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const GLfloat *rMap = ctx->PixelMaps.ItoR.Map;
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const GLfloat *gMap = ctx->PixelMaps.ItoG.Map;
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const GLfloat *bMap = ctx->PixelMaps.ItoB.Map;
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const GLfloat *aMap = ctx->PixelMaps.ItoA.Map;
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GLuint i;
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for (i=0;i<n;i++) {
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rgba[i][RCOMP] = rMap[index[i] & rmask];
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rgba[i][GCOMP] = gMap[index[i] & gmask];
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rgba[i][BCOMP] = bMap[index[i] & bmask];
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rgba[i][ACOMP] = aMap[index[i] & amask];
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}
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}
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/**
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* Map ubyte color indexes to ubyte/RGBA values.
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*/
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void
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_mesa_map_ci8_to_rgba8(const struct gl_context *ctx,
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GLuint n, const GLubyte index[],
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GLubyte rgba[][4])
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{
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GLuint rmask = ctx->PixelMaps.ItoR.Size - 1;
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GLuint gmask = ctx->PixelMaps.ItoG.Size - 1;
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GLuint bmask = ctx->PixelMaps.ItoB.Size - 1;
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GLuint amask = ctx->PixelMaps.ItoA.Size - 1;
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const GLubyte *rMap = ctx->PixelMaps.ItoR.Map8;
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const GLubyte *gMap = ctx->PixelMaps.ItoG.Map8;
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const GLubyte *bMap = ctx->PixelMaps.ItoB.Map8;
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const GLubyte *aMap = ctx->PixelMaps.ItoA.Map8;
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GLuint i;
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for (i=0;i<n;i++) {
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rgba[i][RCOMP] = rMap[index[i] & rmask];
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rgba[i][GCOMP] = gMap[index[i] & gmask];
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rgba[i][BCOMP] = bMap[index[i] & bmask];
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rgba[i][ACOMP] = aMap[index[i] & amask];
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}
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}
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void
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_mesa_scale_and_bias_depth(const struct gl_context *ctx, GLuint n,
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GLfloat depthValues[])
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{
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const GLfloat scale = ctx->Pixel.DepthScale;
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const GLfloat bias = ctx->Pixel.DepthBias;
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GLuint i;
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for (i = 0; i < n; i++) {
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GLfloat d = depthValues[i] * scale + bias;
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depthValues[i] = CLAMP(d, 0.0F, 1.0F);
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}
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}
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void
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_mesa_scale_and_bias_depth_uint(const struct gl_context *ctx, GLuint n,
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GLuint depthValues[])
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{
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const GLdouble max = (double) 0xffffffff;
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const GLdouble scale = ctx->Pixel.DepthScale;
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const GLdouble bias = ctx->Pixel.DepthBias * max;
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GLuint i;
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for (i = 0; i < n; i++) {
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GLdouble d = (GLdouble) depthValues[i] * scale + bias;
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d = CLAMP(d, 0.0, max);
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depthValues[i] = (GLuint) d;
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}
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}
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/**
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* Apply various pixel transfer operations to an array of RGBA pixels
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* as indicated by the transferOps bitmask
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*/
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void
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_mesa_apply_rgba_transfer_ops(struct gl_context *ctx, GLbitfield transferOps,
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GLuint n, GLfloat rgba[][4])
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{
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/* scale & bias */
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if (transferOps & IMAGE_SCALE_BIAS_BIT) {
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_mesa_scale_and_bias_rgba(n, rgba,
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ctx->Pixel.RedScale, ctx->Pixel.GreenScale,
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ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale,
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ctx->Pixel.RedBias, ctx->Pixel.GreenBias,
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ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias);
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}
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/* color map lookup */
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if (transferOps & IMAGE_MAP_COLOR_BIT) {
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_mesa_map_rgba( ctx, n, rgba );
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}
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/* clamping to [0,1] */
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if (transferOps & IMAGE_CLAMP_BIT) {
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GLuint i;
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for (i = 0; i < n; i++) {
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rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
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rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
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rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
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rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
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}
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}
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}
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/*
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* Apply color index shift and offset to an array of pixels.
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*/
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void
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_mesa_shift_and_offset_ci(const struct gl_context *ctx,
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GLuint n, GLuint indexes[])
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{
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GLint shift = ctx->Pixel.IndexShift;
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GLint offset = ctx->Pixel.IndexOffset;
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GLuint i;
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if (shift > 0) {
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for (i=0;i<n;i++) {
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indexes[i] = (indexes[i] << shift) + offset;
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}
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}
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else if (shift < 0) {
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shift = -shift;
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for (i=0;i<n;i++) {
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indexes[i] = (indexes[i] >> shift) + offset;
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}
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}
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else {
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for (i=0;i<n;i++) {
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indexes[i] = indexes[i] + offset;
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}
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}
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}
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/**
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* Apply color index shift, offset and table lookup to an array
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* of color indexes;
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*/
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void
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_mesa_apply_ci_transfer_ops(const struct gl_context *ctx,
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GLbitfield transferOps,
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GLuint n, GLuint indexes[])
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{
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if (transferOps & IMAGE_SHIFT_OFFSET_BIT) {
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_mesa_shift_and_offset_ci(ctx, n, indexes);
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}
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if (transferOps & IMAGE_MAP_COLOR_BIT) {
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const GLuint mask = ctx->PixelMaps.ItoI.Size - 1;
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GLuint i;
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for (i = 0; i < n; i++) {
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const GLuint j = indexes[i] & mask;
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indexes[i] = IROUND(ctx->PixelMaps.ItoI.Map[j]);
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}
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}
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}
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/**
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* Apply stencil index shift, offset and table lookup to an array
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* of stencil values.
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*/
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void
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_mesa_apply_stencil_transfer_ops(const struct gl_context *ctx, GLuint n,
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GLubyte stencil[])
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{
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if (ctx->Pixel.IndexShift != 0 || ctx->Pixel.IndexOffset != 0) {
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const GLint offset = ctx->Pixel.IndexOffset;
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GLint shift = ctx->Pixel.IndexShift;
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GLuint i;
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if (shift > 0) {
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for (i = 0; i < n; i++) {
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stencil[i] = (stencil[i] << shift) + offset;
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}
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}
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else if (shift < 0) {
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shift = -shift;
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for (i = 0; i < n; i++) {
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stencil[i] = (stencil[i] >> shift) + offset;
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}
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}
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else {
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for (i = 0; i < n; i++) {
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stencil[i] = stencil[i] + offset;
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}
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}
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}
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if (ctx->Pixel.MapStencilFlag) {
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GLuint mask = ctx->PixelMaps.StoS.Size - 1;
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GLuint i;
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for (i = 0; i < n; i++) {
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stencil[i] = (GLubyte) ctx->PixelMaps.StoS.Map[ stencil[i] & mask ];
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}
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}
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}
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