added GL_ARB_texture_border_clamp

5 files changed, 92 insertions, 32 deletions

diff --git a/src/mesa/main/enums.c b/src/mesa/main/enums.c
index 310b80f532..1801a4e499 100644
--- a/src/mesa/main/enums.c
+++ b/src/mesa/main/enums.c
@@ -1,4 +1,4 @@
-/* $Id: enums.c,v 1.15 2001/03/22 04:57:09 brianp Exp $ */
+/* $Id: enums.c,v 1.16 2001/03/26 19:42:40 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -841,6 +841,8 @@ enum_elt all_enums[] =
    { "GL_DOT3_RGB_EXT", 0x86ae },
    { "GL_DOT3_RGBA_EXT", 0x86af },
 
+   /* GL_ARB_texture_border_clamp */
+   { "GL_CLAMP_TO_BORDER_ARB", 0x812D },
 };
 
 #define Elements(x) sizeof(x)/sizeof(*x)
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index 395005681a..372b2bb687 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -1,4 +1,4 @@
-/* $Id: extensions.c,v 1.55 2001/03/22 14:42:24 brianp Exp $ */
+/* $Id: extensions.c,v 1.56 2001/03/26 19:42:40 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -58,6 +58,7 @@ static struct {
 } default_extensions[] = {
    { OFF, "GL_ARB_imaging",                    F(ARB_imaging) },
    { OFF, "GL_ARB_multitexture",               F(ARB_multitexture) },
+   { OFF, "GL_ARB_texture_border_clamp",       F(ARB_texture_border_clamp) },
    { OFF, "GL_ARB_texture_compression",        F(ARB_texture_compression) },
    { OFF, "GL_ARB_texture_cube_map",           F(ARB_texture_cube_map) },
    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
@@ -106,6 +107,7 @@ static struct {
    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
    { OFF, "GL_SGIS_pixel_texture",             F(SGIS_pixel_texture) },
+   { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
    { OFF, "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
    { OFF, "GL_SGIX_depth_texture",             F(SGIX_depth_texture) },
    { OFF, "GL_SGIX_pixel_texture",             F(SGIX_pixel_texture) },
@@ -127,6 +129,7 @@ _mesa_enable_sw_extensions(GLcontext *ctx)
    const char *extensions[] = {
       "GL_ARB_imaging",
       "GL_ARB_multitexture",
+      "GL_ARB_texture_border_clamp",
       "GL_ARB_texture_cube_map",
       "GL_ARB_texture_env_add",
       "GL_ARB_texture_env_combine",
@@ -157,6 +160,7 @@ _mesa_enable_sw_extensions(GLcontext *ctx)
       "GL_SGI_color_table",
       "GL_SGIS_pixel_texture",
       "GL_SGIS_texture_edge_clamp",
+      "GL_SGIS_texture_border_clamp",
       "GL_SGIX_depth_texture",
       "GL_SGIX_pixel_texture",
       "GL_SGIX_shadow",
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 2c7f2e1da8..c261756b5b 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1,4 +1,4 @@
-/* $Id: mtypes.h,v 1.31 2001/03/24 06:01:27 gareth Exp $ */
+/* $Id: mtypes.h,v 1.32 2001/03/26 19:42:40 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -798,8 +798,8 @@ struct gl_texture_format {
 /* Texture image record */
 struct gl_texture_image {
    GLenum Format;		/* GL_ALPHA, GL_LUMINANCE, GL_LUMINANCE_ALPHA,
-				 * GL_INTENSITY, GL_RGB, GL_RGBA, or
-				 * GL_COLOR_INDEX only
+				 * GL_INTENSITY, GL_RGB, GL_RGBA,
+                                 * GL_COLOR_INDEX or GL_DEPTH_COMPONENT only.
 				 */
    GLenum Type;			/* Texel type: GL_UNSIGNED_BYTE, etc. */
    GLenum IntFormat;		/* Internal format as given by the user */
@@ -836,9 +836,9 @@ struct gl_texture_object {
    GLuint Dimensions;		/* 1 or 2 or 3 or 6 (cube map) */
    GLfloat Priority;		/* in [0,1] */
    GLchan BorderColor[4];
-   GLenum WrapS;		/* GL_CLAMP, REPEAT or CLAMP_TO_EDGE */
-   GLenum WrapT;		/* GL_CLAMP, REPEAT or CLAMP_TO_EDGE */
-   GLenum WrapR;		/* GL_CLAMP, REPEAT or CLAMP_TO_EDGE */
+   GLenum WrapS;		/* Wrap modes are: GL_CLAMP, REPEAT */
+   GLenum WrapT;		/*   GL_CLAMP_TO_EDGE, and          */
+   GLenum WrapR;		/*   GL_CLAMP_TO_BORDER_ARB         */
    GLenum MinFilter;		/* minification filter */
    GLenum MagFilter;		/* magnification filter */
    GLfloat MinLod;		/* min lambda, OpenGL 1.2 */
@@ -1203,6 +1203,7 @@ struct gl_extensions {
     */
    GLboolean ARB_imaging;
    GLboolean ARB_multitexture;
+   GLboolean ARB_texture_border_clamp;
    GLboolean ARB_texture_compression;
    GLboolean ARB_texture_cube_map;
    GLboolean EXT_blend_color;
diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c
index 438ba6f142..93d12e7191 100644
--- a/src/mesa/main/texstate.c
+++ b/src/mesa/main/texstate.c
@@ -1,4 +1,4 @@
-/* $Id: texstate.c,v 1.38 2001/03/22 04:54:58 brianp Exp $ */
+/* $Id: texstate.c,v 1.39 2001/03/26 19:42:40 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -63,6 +63,10 @@
 #define GL_DOT3_RGBA_ARB 0x86AF
 #endif
 
+/* XXX this is temporary, until GL/glext.h is updated. */
+#ifndef GL_CLAMP_TO_BORDER_ARB
+#define GL_CLAMP_TO_BORDER_ARB 0x812D
+#endif
 
 
 /**********************************************************************/
@@ -722,8 +726,11 @@ _mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
       case GL_TEXTURE_WRAP_S:
          if (texObj->WrapS == eparam)
             return;
-
-         if (eparam==GL_CLAMP || eparam==GL_REPEAT || eparam==GL_CLAMP_TO_EDGE) {
+         if (eparam==GL_CLAMP ||
+             eparam==GL_REPEAT ||
+             eparam==GL_CLAMP_TO_EDGE ||
+             (eparam == GL_CLAMP_TO_BORDER_ARB &&
+              ctx->Extensions.ARB_texture_border_clamp)) {
             texObj->WrapS = eparam;
          }
          else {
@@ -734,8 +741,11 @@ _mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
       case GL_TEXTURE_WRAP_T:
          if (texObj->WrapT == eparam)
             return;
-
-         if (eparam==GL_CLAMP || eparam==GL_REPEAT || eparam==GL_CLAMP_TO_EDGE) {
+         if (eparam==GL_CLAMP ||
+             eparam==GL_REPEAT ||
+             eparam==GL_CLAMP_TO_EDGE ||
+             (eparam == GL_CLAMP_TO_BORDER_ARB &&
+              ctx->Extensions.ARB_texture_border_clamp)) {
             texObj->WrapT = eparam;
          }
          else {
@@ -746,8 +756,11 @@ _mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
       case GL_TEXTURE_WRAP_R_EXT:
          if (texObj->WrapR == eparam)
             return;
-
-         if (eparam==GL_CLAMP || eparam==GL_REPEAT || eparam==GL_CLAMP_TO_EDGE) {
+         if (eparam==GL_CLAMP ||
+             eparam==GL_REPEAT ||
+             eparam==GL_CLAMP_TO_EDGE ||
+             (eparam == GL_CLAMP_TO_BORDER_ARB &&
+              ctx->Extensions.ARB_texture_border_clamp)) {
             texObj->WrapR = eparam;
          }
          else {
diff --git a/src/mesa/swrast/s_texture.c b/src/mesa/swrast/s_texture.c
index 10349e4ced..220d3a4366 100644
--- a/src/mesa/swrast/s_texture.c
+++ b/src/mesa/swrast/s_texture.c
@@ -1,4 +1,4 @@
-/* $Id: s_texture.c,v 1.19 2001/03/23 18:53:26 brianp Exp $ */
+/* $Id: s_texture.c,v 1.20 2001/03/26 19:42:40 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -46,6 +46,11 @@
 #define GL_DOT3_RGBA_ARB 0x86AF
 #endif
 
+/* XXX this is temporary, until GL/glext.h is updated. */
+#ifndef GL_CLAMP_TO_BORDER_ARB
+#define GL_CLAMP_TO_BORDER_ARB 0x812D
+#endif
+
 
 /*
  * These values are used in the fixed-point arithmetic used
@@ -58,7 +63,7 @@
 /*
  * Used to compute texel locations for linear sampling.
  * Input:
- *    wrapMode = GL_REPEAT, GL_CLAMP or GL_CLAMP_TO_EDGE
+ *    wrapMode = GL_REPEAT, GL_CLAMP, GL_CLAMP_TO_EDGE, GL_CLAMP_TO_BORDER_ARB
  *    S = texcoord in [0,1]
  *    SIZE = width (or height or depth) of texture
  * Output:
@@ -72,22 +77,45 @@
       I0 = IFLOOR(U) & (SIZE - 1);					\
       I1 = (I0 + 1) & (SIZE - 1);					\
    }									\
+   else if (wrapMode == GL_CLAMP_TO_EDGE) {				\
+      if (S <= 0.0F)							\
+         U = 0.0F;							\
+      else if (S >= 1.0F)						\
+         U = SIZE;							\
+      else								\
+         U = S * SIZE;							\
+      U -= 0.5F;							\
+      I0 = IFLOOR(U);							\
+      I1 = I0 + 1;							\
+      if (I0 < 0)							\
+         I0 = 0;							\
+      if (I1 >= (GLint) SIZE)						\
+         I1 = SIZE - 1;							\
+   }									\
+   else  if (wrapMode == GL_CLAMP_TO_BORDER_ARB) {			\
+      const GLfloat min = -1.0F / (2.0F * SIZE);			\
+      const GLfloat max = 1.0F - min;					\
+      if (S <= min)							\
+         U = min * SIZE;						\
+      else if (S >= max)						\
+         U = max * SIZE;						\
+      else								\
+         U = S * SIZE;							\
+      U -= 0.5F;							\
+      I0 = IFLOOR(U);							\
+      I1 = I0 + 1;							\
+   }									\
    else {								\
+      ASSERT(wrapMode == GL_CLAMP);					\
       if (S <= 0.0F)							\
          U = 0.0F;							\
       else if (S >= 1.0F)						\
          U = SIZE;							\
-      else							        \
-         U = S * SIZE;						        \
+      else								\
+         U = S * SIZE;							\
       U -= 0.5F;							\
       I0 = IFLOOR(U);							\
       I1 = I0 + 1;							\
-      if (wrapMode == GL_CLAMP_TO_EDGE) {				\
-         if (I0 < 0)							\
-            I0 = 0;							\
-         if (I1 >= (GLint) SIZE)					\
-            I1 = SIZE - 1;						\
-      }									\
    }									\
 }
 
@@ -99,13 +127,13 @@
 {									\
    if (wrapMode == GL_REPEAT) {						\
       /* s limited to [0,1) */						\
-      /* i limited to [0,width-1] */					\
-      I = (GLint) (S * SIZE);						\
-      if (S < 0.0F)							\
-         I -= 1;							\
+      /* i limited to [0,size-1] */					\
+      I = IFLOOR(S * SIZE);						\
       I &= (SIZE - 1);							\
    }									\
    else if (wrapMode == GL_CLAMP_TO_EDGE) {				\
+      /* s limited to [min,max] */					\
+      /* i limited to [0, size-1] */					\
       const GLfloat min = 1.0F / (2.0F * SIZE);				\
       const GLfloat max = 1.0F - min;					\
       if (S < min)							\
@@ -113,18 +141,30 @@
       else if (S > max)							\
          I = SIZE - 1;							\
       else								\
-         I = (GLint) (S * SIZE);					\
+         I = IFLOOR(S * SIZE);						\
+   }									\
+   else if (wrapMode == GL_CLAMP_TO_BORDER_ARB) {			\
+      /* s limited to [min,max] */					\
+      /* i limited to [-1, size] */					\
+      const GLfloat min = -1.0F / (2.0F * SIZE);			\
+      const GLfloat max = 1.0F - min;					\
+      if (S <= min)							\
+         I = -1;							\
+      else if (S >= max)						\
+         I = SIZE;							\
+      else								\
+         I = IFLOOR(S * SIZE);						\
    }									\
    else {								\
       ASSERT(wrapMode == GL_CLAMP);					\
       /* s limited to [0,1] */						\
-      /* i limited to [0,width-1] */					\
+      /* i limited to [0,size-1] */					\
       if (S <= 0.0F)							\
          I = 0;								\
       else if (S >= 1.0F)						\
          I = SIZE - 1;							\
       else								\
-         I = (GLint) (S * SIZE);					\
+         I = IFLOOR(S * SIZE);						\
    }									\
 }