| /* |
| * Mesa 3-D graphics library |
| * |
| * Copyright (C) 1999-2008 Brian Paul All Rights Reserved. |
| * Copyright (C) 2009-2010 VMware, Inc. 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 |
| * THE AUTHORS OR COPYRIGHT HOLDERS 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. |
| */ |
| |
| |
| /** |
| * \file pixeltransfer.c |
| * Pixel transfer operations (scale, bias, table lookups, etc) |
| */ |
| |
| |
| #include "glheader.h" |
| #include "macros.h" |
| #include "pixeltransfer.h" |
| #include "imports.h" |
| #include "mtypes.h" |
| #include "util/rounding.h" |
| |
| |
| /* |
| * Apply scale and bias factors to an array of RGBA pixels. |
| */ |
| void |
| _mesa_scale_and_bias_rgba(GLuint n, GLfloat rgba[][4], |
| GLfloat rScale, GLfloat gScale, |
| GLfloat bScale, GLfloat aScale, |
| GLfloat rBias, GLfloat gBias, |
| GLfloat bBias, GLfloat aBias) |
| { |
| if (rScale != 1.0F || rBias != 0.0F) { |
| GLuint i; |
| for (i = 0; i < n; i++) { |
| rgba[i][RCOMP] = rgba[i][RCOMP] * rScale + rBias; |
| } |
| } |
| if (gScale != 1.0F || gBias != 0.0F) { |
| GLuint i; |
| for (i = 0; i < n; i++) { |
| rgba[i][GCOMP] = rgba[i][GCOMP] * gScale + gBias; |
| } |
| } |
| if (bScale != 1.0F || bBias != 0.0F) { |
| GLuint i; |
| for (i = 0; i < n; i++) { |
| rgba[i][BCOMP] = rgba[i][BCOMP] * bScale + bBias; |
| } |
| } |
| if (aScale != 1.0F || aBias != 0.0F) { |
| GLuint i; |
| for (i = 0; i < n; i++) { |
| rgba[i][ACOMP] = rgba[i][ACOMP] * aScale + aBias; |
| } |
| } |
| } |
| |
| |
| /* |
| * Apply pixel mapping to an array of floating point RGBA pixels. |
| */ |
| void |
| _mesa_map_rgba( const struct gl_context *ctx, GLuint n, GLfloat rgba[][4] ) |
| { |
| const GLfloat rscale = (GLfloat) (ctx->PixelMaps.RtoR.Size - 1); |
| const GLfloat gscale = (GLfloat) (ctx->PixelMaps.GtoG.Size - 1); |
| const GLfloat bscale = (GLfloat) (ctx->PixelMaps.BtoB.Size - 1); |
| const GLfloat ascale = (GLfloat) (ctx->PixelMaps.AtoA.Size - 1); |
| const GLfloat *rMap = ctx->PixelMaps.RtoR.Map; |
| const GLfloat *gMap = ctx->PixelMaps.GtoG.Map; |
| const GLfloat *bMap = ctx->PixelMaps.BtoB.Map; |
| const GLfloat *aMap = ctx->PixelMaps.AtoA.Map; |
| GLuint i; |
| for (i=0;i<n;i++) { |
| GLfloat r = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F); |
| GLfloat g = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F); |
| GLfloat b = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F); |
| GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F); |
| rgba[i][RCOMP] = rMap[(int)_mesa_lroundevenf(r * rscale)]; |
| rgba[i][GCOMP] = gMap[(int)_mesa_lroundevenf(g * gscale)]; |
| rgba[i][BCOMP] = bMap[(int)_mesa_lroundevenf(b * bscale)]; |
| rgba[i][ACOMP] = aMap[(int)_mesa_lroundevenf(a * ascale)]; |
| } |
| } |
| |
| /* |
| * Map color indexes to float rgba values. |
| */ |
| void |
| _mesa_map_ci_to_rgba( const struct gl_context *ctx, GLuint n, |
| const GLuint index[], GLfloat rgba[][4] ) |
| { |
| GLuint rmask = ctx->PixelMaps.ItoR.Size - 1; |
| GLuint gmask = ctx->PixelMaps.ItoG.Size - 1; |
| GLuint bmask = ctx->PixelMaps.ItoB.Size - 1; |
| GLuint amask = ctx->PixelMaps.ItoA.Size - 1; |
| const GLfloat *rMap = ctx->PixelMaps.ItoR.Map; |
| const GLfloat *gMap = ctx->PixelMaps.ItoG.Map; |
| const GLfloat *bMap = ctx->PixelMaps.ItoB.Map; |
| const GLfloat *aMap = ctx->PixelMaps.ItoA.Map; |
| GLuint i; |
| for (i=0;i<n;i++) { |
| rgba[i][RCOMP] = rMap[index[i] & rmask]; |
| rgba[i][GCOMP] = gMap[index[i] & gmask]; |
| rgba[i][BCOMP] = bMap[index[i] & bmask]; |
| rgba[i][ACOMP] = aMap[index[i] & amask]; |
| } |
| } |
| |
| |
| void |
| _mesa_scale_and_bias_depth(const struct gl_context *ctx, GLuint n, |
| GLfloat depthValues[]) |
| { |
| const GLfloat scale = ctx->Pixel.DepthScale; |
| const GLfloat bias = ctx->Pixel.DepthBias; |
| GLuint i; |
| for (i = 0; i < n; i++) { |
| GLfloat d = depthValues[i] * scale + bias; |
| depthValues[i] = CLAMP(d, 0.0F, 1.0F); |
| } |
| } |
| |
| |
| void |
| _mesa_scale_and_bias_depth_uint(const struct gl_context *ctx, GLuint n, |
| GLuint depthValues[]) |
| { |
| const GLdouble max = (double) 0xffffffff; |
| const GLdouble scale = ctx->Pixel.DepthScale; |
| const GLdouble bias = ctx->Pixel.DepthBias * max; |
| GLuint i; |
| for (i = 0; i < n; i++) { |
| GLdouble d = (GLdouble) depthValues[i] * scale + bias; |
| d = CLAMP(d, 0.0, max); |
| depthValues[i] = (GLuint) d; |
| } |
| } |
| |
| /** |
| * Apply various pixel transfer operations to an array of RGBA pixels |
| * as indicated by the transferOps bitmask |
| */ |
| void |
| _mesa_apply_rgba_transfer_ops(struct gl_context *ctx, GLbitfield transferOps, |
| GLuint n, GLfloat rgba[][4]) |
| { |
| /* scale & bias */ |
| if (transferOps & IMAGE_SCALE_BIAS_BIT) { |
| _mesa_scale_and_bias_rgba(n, rgba, |
| ctx->Pixel.RedScale, ctx->Pixel.GreenScale, |
| ctx->Pixel.BlueScale, ctx->Pixel.AlphaScale, |
| ctx->Pixel.RedBias, ctx->Pixel.GreenBias, |
| ctx->Pixel.BlueBias, ctx->Pixel.AlphaBias); |
| } |
| /* color map lookup */ |
| if (transferOps & IMAGE_MAP_COLOR_BIT) { |
| _mesa_map_rgba( ctx, n, rgba ); |
| } |
| |
| /* clamping to [0,1] */ |
| if (transferOps & IMAGE_CLAMP_BIT) { |
| GLuint i; |
| for (i = 0; i < n; i++) { |
| rgba[i][RCOMP] = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F); |
| rgba[i][GCOMP] = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F); |
| rgba[i][BCOMP] = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F); |
| rgba[i][ACOMP] = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F); |
| } |
| } |
| } |
| |
| |
| /* |
| * Apply color index shift and offset to an array of pixels. |
| */ |
| void |
| _mesa_shift_and_offset_ci(const struct gl_context *ctx, |
| GLuint n, GLuint indexes[]) |
| { |
| GLint shift = ctx->Pixel.IndexShift; |
| GLint offset = ctx->Pixel.IndexOffset; |
| GLuint i; |
| if (shift > 0) { |
| for (i=0;i<n;i++) { |
| indexes[i] = (indexes[i] << shift) + offset; |
| } |
| } |
| else if (shift < 0) { |
| shift = -shift; |
| for (i=0;i<n;i++) { |
| indexes[i] = (indexes[i] >> shift) + offset; |
| } |
| } |
| else { |
| for (i=0;i<n;i++) { |
| indexes[i] = indexes[i] + offset; |
| } |
| } |
| } |
| |
| |
| |
| /** |
| * Apply color index shift, offset and table lookup to an array |
| * of color indexes; |
| */ |
| void |
| _mesa_apply_ci_transfer_ops(const struct gl_context *ctx, |
| GLbitfield transferOps, |
| GLuint n, GLuint indexes[]) |
| { |
| if (transferOps & IMAGE_SHIFT_OFFSET_BIT) { |
| _mesa_shift_and_offset_ci(ctx, n, indexes); |
| } |
| if (transferOps & IMAGE_MAP_COLOR_BIT) { |
| const GLuint mask = ctx->PixelMaps.ItoI.Size - 1; |
| GLuint i; |
| for (i = 0; i < n; i++) { |
| const GLuint j = indexes[i] & mask; |
| indexes[i] = _mesa_lroundevenf(ctx->PixelMaps.ItoI.Map[j]); |
| } |
| } |
| } |
| |
| |
| /** |
| * Apply stencil index shift, offset and table lookup to an array |
| * of stencil values. |
| */ |
| void |
| _mesa_apply_stencil_transfer_ops(const struct gl_context *ctx, GLuint n, |
| GLubyte stencil[]) |
| { |
| if (ctx->Pixel.IndexShift != 0 || ctx->Pixel.IndexOffset != 0) { |
| const GLint offset = ctx->Pixel.IndexOffset; |
| GLint shift = ctx->Pixel.IndexShift; |
| GLuint i; |
| if (shift > 0) { |
| for (i = 0; i < n; i++) { |
| stencil[i] = (stencil[i] << shift) + offset; |
| } |
| } |
| else if (shift < 0) { |
| shift = -shift; |
| for (i = 0; i < n; i++) { |
| stencil[i] = (stencil[i] >> shift) + offset; |
| } |
| } |
| else { |
| for (i = 0; i < n; i++) { |
| stencil[i] = stencil[i] + offset; |
| } |
| } |
| } |
| if (ctx->Pixel.MapStencilFlag) { |
| GLuint mask = ctx->PixelMaps.StoS.Size - 1; |
| GLuint i; |
| for (i = 0; i < n; i++) { |
| stencil[i] = (GLubyte) ctx->PixelMaps.StoS.Map[ stencil[i] & mask ]; |
| } |
| } |
| } |
