From 3c14ec9b553f88a4cd4be5d8a564b54bbe81d2b4 Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Sat, 30 Oct 1999 08:20:57 +0000
Subject: added a few more scale/bias/lookup functions (for future use)

---
 src/mesa/main/pixel.c | 107 +++++++++++++++++++++++++++++++++++++++++++++-----
 src/mesa/main/pixel.h |  15 ++++++-
 2 files changed, 111 insertions(+), 11 deletions(-)

(limited to 'src')

diff --git a/src/mesa/main/pixel.c b/src/mesa/main/pixel.c
index 90257b7f3d..0952f8cbe9 100644
--- a/src/mesa/main/pixel.c
+++ b/src/mesa/main/pixel.c
@@ -1,4 +1,4 @@
-/* $Id: pixel.c,v 1.2 1999/10/08 09:27:11 keithw Exp $ */
+/* $Id: pixel.c,v 1.3 1999/10/30 08:20:57 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -588,6 +588,46 @@ void gl_scale_and_bias_rgba( const GLcontext *ctx, GLuint n, GLubyte rgba[][4] )
 }
 
 
+/*
+ * Apply scale and bias factors to an array of RGBA pixels.
+ */
+void gl_scale_and_bias_rgba_float( const GLcontext *ctx, GLuint n, GLfloat rgba[][4] )
+{
+   if (ctx->Pixel.RedScale != 1.0 || ctx->Pixel.RedBias != 0.0) {
+      const GLfloat scale = ctx->Pixel.RedScale;
+      const GLfloat bias = ctx->Pixel.RedBias;
+      GLuint i;
+      for (i = 0; i < n; i++) {
+         rgba[i][RCOMP] = rgba[i][RCOMP] * scale + bias;
+      }
+   }
+   if (ctx->Pixel.GreenScale != 1.0 || ctx->Pixel.GreenBias != 0.0) {
+      const GLfloat scale = ctx->Pixel.GreenScale;
+      const GLfloat bias = ctx->Pixel.GreenBias;
+      GLuint i;
+      for (i = 0; i < n; i++) {
+         rgba[i][GCOMP] = rgba[i][GCOMP] * scale + bias;
+      }
+   }
+   if (ctx->Pixel.BlueScale != 1.0 || ctx->Pixel.BlueBias != 0.0) {
+      const GLfloat scale = ctx->Pixel.BlueScale;
+      const GLfloat bias = ctx->Pixel.BlueBias;
+      GLuint i;
+      for (i = 0; i < n; i++) {
+         rgba[i][BCOMP] = rgba[i][BCOMP] * scale + bias;
+      }
+   }
+   if (ctx->Pixel.AlphaScale != 1.0 || ctx->Pixel.AlphaBias != 0.0) {
+      const GLfloat scale = ctx->Pixel.AlphaScale;
+      const GLfloat bias = ctx->Pixel.AlphaBias;
+      GLuint i;
+      for (i = 0; i < n; i++) {
+         rgba[i][ACOMP] = rgba[i][ACOMP] * scale + bias;
+      }
+   }
+}
+
+
 /*
  * Apply pixel mapping to an array of RGBA pixels.
  */
@@ -611,6 +651,29 @@ void gl_map_rgba( const GLcontext *ctx, GLuint n, GLubyte rgba[][4] )
 }
 
 
+/*
+ * Apply pixel mapping to an array of floating point RGBA pixels.
+ */
+void gl_map_rgba_float( const GLcontext *ctx, GLuint n, GLfloat rgba[][4] )
+{
+   const GLfloat rscale = ctx->Pixel.MapRtoRsize - 1;
+   const GLfloat gscale = ctx->Pixel.MapGtoGsize - 1;
+   const GLfloat bscale = ctx->Pixel.MapBtoBsize - 1;
+   const GLfloat ascale = ctx->Pixel.MapAtoAsize - 1;
+   const GLfloat *rMap = ctx->Pixel.MapRtoR;
+   const GLfloat *gMap = ctx->Pixel.MapGtoG;
+   const GLfloat *bMap = ctx->Pixel.MapBtoB;
+   const GLfloat *aMap = ctx->Pixel.MapAtoA;
+   GLuint i;
+   for (i=0;i<n;i++) {
+      rgba[i][RCOMP] = rMap[(GLint) (rgba[i][RCOMP] * rscale + 0.5F)];
+      rgba[i][GCOMP] = gMap[(GLint) (rgba[i][GCOMP] * gscale + 0.5F)];
+      rgba[i][BCOMP] = bMap[(GLint) (rgba[i][BCOMP] * bscale + 0.5F)];
+      rgba[i][ACOMP] = aMap[(GLint) (rgba[i][ACOMP] * ascale + 0.5F)];
+   }
+}
+
+
 /*
  * Apply pixel mapping to an array of RGBA pixels.
  */
@@ -618,16 +681,16 @@ void gl_map_color( const GLcontext *ctx, GLuint n,
                    GLfloat red[], GLfloat green[],
                    GLfloat blue[], GLfloat alpha[] )
 {
-   GLfloat rscale = ctx->Pixel.MapRtoRsize-1;
-   GLfloat gscale = ctx->Pixel.MapGtoGsize-1;
-   GLfloat bscale = ctx->Pixel.MapBtoBsize-1;
-   GLfloat ascale = ctx->Pixel.MapAtoAsize-1;
+   GLfloat rscale = ctx->Pixel.MapRtoRsize - 1;
+   GLfloat gscale = ctx->Pixel.MapGtoGsize - 1;
+   GLfloat bscale = ctx->Pixel.MapBtoBsize - 1;
+   GLfloat ascale = ctx->Pixel.MapAtoAsize - 1;
    GLuint i;
    for (i=0;i<n;i++) {
-      red[i]   = ctx->Pixel.MapRtoR[ (GLint) (red[i]   * rscale) ];
-      green[i] = ctx->Pixel.MapGtoG[ (GLint) (green[i] * gscale) ];
-      blue[i]  = ctx->Pixel.MapBtoB[ (GLint) (blue[i]  * bscale) ];
-      alpha[i] = ctx->Pixel.MapAtoA[ (GLint) (alpha[i] * ascale) ];
+      red[i]   = ctx->Pixel.MapRtoR[ (GLint) (red[i]   * rscale + 0.5F) ];
+      green[i] = ctx->Pixel.MapGtoG[ (GLint) (green[i] * gscale + 0.5F) ];
+      blue[i]  = ctx->Pixel.MapBtoB[ (GLint) (blue[i]  * bscale + 0.5F) ];
+      alpha[i] = ctx->Pixel.MapAtoA[ (GLint) (alpha[i] * ascale + 0.5F) ];
    }
 }
 
@@ -674,7 +737,7 @@ void gl_map_ci( const GLcontext *ctx, GLuint n, GLuint index[] )
 
 
 /*
- * Map color indexes to rgb values.
+ * Map color indexes to rgba values.
  */
 void gl_map_ci_to_rgba( const GLcontext *ctx, GLuint n, const GLuint index[],
                         GLubyte rgba[][4] )
@@ -697,6 +760,30 @@ void gl_map_ci_to_rgba( const GLcontext *ctx, GLuint n, const GLuint index[],
 }
 
 
+/*
+ * Map color indexes to float rgba values.
+ */
+void gl_map_ci_to_rgba_float( const GLcontext *ctx, GLuint n, const GLuint index[],
+                              GLfloat rgba[][4] )
+{
+   GLuint rmask = ctx->Pixel.MapItoRsize - 1;
+   GLuint gmask = ctx->Pixel.MapItoGsize - 1;
+   GLuint bmask = ctx->Pixel.MapItoBsize - 1;
+   GLuint amask = ctx->Pixel.MapItoAsize - 1;
+   const GLfloat *rMap = ctx->Pixel.MapItoR;
+   const GLfloat *gMap = ctx->Pixel.MapItoG;
+   const GLfloat *bMap = ctx->Pixel.MapItoB;
+   const GLfloat *aMap = ctx->Pixel.MapItoA;
+   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];
+   }
+}
+
+
 /*
  * Map 8-bit color indexes to rgb values.
  */
diff --git a/src/mesa/main/pixel.h b/src/mesa/main/pixel.h
index c592d06853..d14b011dc7 100644
--- a/src/mesa/main/pixel.h
+++ b/src/mesa/main/pixel.h
@@ -1,4 +1,4 @@
-/* $Id: pixel.h,v 1.1 1999/08/19 00:55:41 jtg Exp $ */
+/* $Id: pixel.h,v 1.2 1999/10/30 08:20:57 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -70,9 +70,17 @@ extern void gl_scale_and_bias_rgba( const GLcontext *ctx, GLuint n,
                                     GLubyte rgba[][4] );
 
 
+extern void gl_scale_and_bias_rgba_float( const GLcontext *ctx, GLuint n,
+                                          GLfloat rgba[][4] );
+
+
 extern void gl_map_rgba( const GLcontext *ctx, GLuint n, GLubyte rgba[][4] );
 
 
+extern void gl_map_rgba_float( const GLcontext *ctx, GLuint n,
+                               GLfloat rgba[][4] );
+
+
 extern void gl_map_color( const GLcontext *ctx, GLuint n,
                           GLfloat red[], GLfloat green[],
                           GLfloat blue[], GLfloat alpha[] );
@@ -90,6 +98,11 @@ extern void gl_map_ci_to_rgba( const GLcontext *ctx,
                                GLubyte rgba[][4] );
 
 
+extern void gl_map_ci_to_rgba_float( const GLcontext *ctx,
+                                     GLuint n, const GLuint index[],
+                                     GLfloat rgba[][4] );
+
+
 extern void gl_map_ci8_to_rgba( const GLcontext *ctx,
                                 GLuint n, const GLubyte index[],
                                 GLubyte rgba[][4] );
-- 
cgit v1.2.3