added GL_ARB_texture_mirrored_repeat

src/mesa/main/extensions.c

@@ -1,4 +1,4 @@
-/* $Id: extensions.c,v 1.64 2001/08/13 18:09:34 brianp Exp $ */
+/* $Id: extensions.c,v 1.65 2001/10/17 13:31:07 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -65,6 +65,7 @@ static struct {
    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
    { OFF, "GL_ARB_texture_env_combine",        F(ARB_texture_env_combine) },
    { OFF, "GL_ARB_texture_env_dot3",           F(ARB_texture_env_dot3) },
+   { OFF, "GL_ARB_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
    { ON,  "GL_ARB_transpose_matrix",           0 },
    { ON,  "GL_EXT_abgr",                       0 },
    { ON,  "GL_EXT_bgra",                       0 },
@@ -138,6 +139,7 @@ _mesa_enable_sw_extensions(GLcontext *ctx)
       "GL_ARB_texture_env_add",
       "GL_ARB_texture_env_combine",
       "GL_ARB_texture_env_dot3",
+      "GL_ARB_texture_mirrored_repeat",
       "GL_EXT_blend_color",
       "GL_EXT_blend_func_separate",
       "GL_EXT_blend_logic_op",

src/mesa/main/glheader.h

@@ -1,4 +1,4 @@
-/* $Id: glheader.h,v 1.22 2001/07/16 15:54:23 brianp Exp $ */
+/* $Id: glheader.h,v 1.23 2001/10/17 13:31:07 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -260,4 +260,12 @@ typedef struct tagPIXELFORMATDESCRIPTOR PIXELFORMATDESCRIPTOR, *PPIXELFORMATDESC
 typedef union { GLfloat f; GLint i; } fi_type;
 
 
+#ifndef GL_MIRRORED_REPEAT_ARB
+#define GL_MIRRORED_REPEAT_ARB  0x8370
+#endif
+#ifndef GL_ARB_texture_mirrored_repeat
+#define GL_ARB_texture_mirrored_repeat 1
+#endif
+
+
 #endif /* GLHEADER_H */

src/mesa/main/mtypes.h

@@ -1,4 +1,4 @@
-/* $Id: mtypes.h,v 1.50 2001/07/28 19:28:49 keithw Exp $ */
+/* $Id: mtypes.h,v 1.51 2001/10/17 13:31:07 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -1202,6 +1202,7 @@ struct gl_extensions {
    GLboolean ARB_texture_cube_map;
    GLboolean ARB_texture_env_combine;
    GLboolean ARB_texture_env_dot3;
+   GLboolean ARB_texture_mirrored_repeat;
    GLboolean EXT_blend_color;
    GLboolean EXT_blend_func_separate;
    GLboolean EXT_blend_logic_op;

src/mesa/main/texstate.c

@@ -1,4 +1,4 @@
-/* $Id: texstate.c,v 1.57 2001/09/18 23:06:14 kschultz Exp $ */
+/* $Id: texstate.c,v 1.58 2001/10/17 13:31:07 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -140,16 +140,10 @@ _mesa_TexEnvfv( GLenum target, GLenum pname, const GLfloat *param )
                   return;
                }
                break;
-	    case GL_DOT3_RGB_EXT:
-	    case GL_DOT3_RGBA_EXT:
-	       if (!ctx->Extensions.EXT_texture_env_dot3) {
-                  TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
-		  return;
-	       }
-	       break;
 	    case GL_DOT3_RGB_ARB:
 	    case GL_DOT3_RGBA_ARB:
-	       if (!ctx->Extensions.ARB_texture_env_dot3) {
+	       if (!ctx->Extensions.EXT_texture_env_dot3 &&
+                   !ctx->Extensions.ARB_texture_env_dot3) {
                   TE_ERROR(GL_INVALID_ENUM, "glTexEnv(param=%s)", mode);
 		  return;
 	       }
@@ -929,7 +923,9 @@ _mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
              eparam==GL_REPEAT ||
              eparam==GL_CLAMP_TO_EDGE ||
              (eparam == GL_CLAMP_TO_BORDER_ARB &&
-              ctx->Extensions.ARB_texture_border_clamp)) {
+              ctx->Extensions.ARB_texture_border_clamp) ||
+             (eparam == GL_MIRRORED_REPEAT_ARB &&
+              ctx->Extensions.ARB_texture_mirrored_repeat)) {
             texObj->WrapS = eparam;
          }
          else {
@@ -944,7 +940,9 @@ _mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
              eparam==GL_REPEAT ||
              eparam==GL_CLAMP_TO_EDGE ||
              (eparam == GL_CLAMP_TO_BORDER_ARB &&
-              ctx->Extensions.ARB_texture_border_clamp)) {
+              ctx->Extensions.ARB_texture_border_clamp) ||
+             (eparam == GL_MIRRORED_REPEAT_ARB &&
+              ctx->Extensions.ARB_texture_mirrored_repeat)) {
             texObj->WrapT = eparam;
          }
          else {
@@ -959,7 +957,9 @@ _mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
              eparam==GL_REPEAT ||
              eparam==GL_CLAMP_TO_EDGE ||
              (eparam == GL_CLAMP_TO_BORDER_ARB &&
-              ctx->Extensions.ARB_texture_border_clamp)) {
+              ctx->Extensions.ARB_texture_border_clamp) ||
+             (eparam == GL_MIRRORED_REPEAT_ARB &&
+              ctx->Extensions.ARB_texture_mirrored_repeat)) {
             texObj->WrapR = eparam;
          }
          else {

src/mesa/swrast/s_texture.c

@@ -1,4 +1,4 @@
-/* $Id: s_texture.c,v 1.39 2001/09/19 20:30:44 kschultz Exp $ */
+/* $Id: s_texture.c,v 1.40 2001/10/17 13:31:07 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -92,6 +92,19 @@
       I0 = IFLOOR(U);							\
       I1 = I0 + 1;							\
    }									\
+   else if (wrapMode == GL_MIRRORED_REPEAT_ARB) {			\
+      const GLint flr = IFLOOR(S);					\
+      if (flr & 1)							\
+         U = 1.0 - (S - (GLfloat) flr);	/* flr is odd */		\
+      else								\
+         U = S - (GLfloat) flr;		/* flr is even */		\
+      I0 = IFLOOR(U);							\
+      I1 = I0 + 1;							\
+      if (I0 < 0)							\
+         I0 = 0;							\
+      if (I1 >= (GLint) SIZE)						\
+         I1 = SIZE - 1;							\
+   }									\
    else {								\
       ASSERT(wrapMode == GL_CLAMP);					\
       if (S <= 0.0F)							\
@@ -142,6 +155,22 @@
       else								\
          I = IFLOOR(S * SIZE);						\
    }									\
+   else if (wrapMode == GL_MIRRORED_REPEAT_ARB) {			\
+      const GLfloat min = 1.0F / (2.0F * SIZE);				\
+      const GLfloat max = 1.0F - min;					\
+      const GLint flr = IFLOOR(S);					\
+      GLfloat u;							\
+      if (flr & 1)							\
+         u = 1.0 - (S - (GLfloat) flr);	/* flr is odd */		\
+      else								\
+         u = S - (GLfloat) flr;		/* flr is even */		\
+      if (u < min)							\
+         I = 0;								\
+      else if (u > max)							\
+         I = SIZE - 1;							\
+      else								\
+         I = IFLOOR(u * SIZE);						\
+   }									\
    else {								\
       ASSERT(wrapMode == GL_CLAMP);					\
       /* s limited to [0,1] */						\
@@ -2133,8 +2162,6 @@ texture_combine(const GLcontext *ctx,
             }
          }
          break;
-      case GL_DOT3_RGB_EXT:
-      case GL_DOT3_RGBA_EXT:
       case GL_DOT3_RGB_ARB:
       case GL_DOT3_RGBA_ARB:
          {