added GL_EXT_texture_lod_bias extension (Michael Vance)

3 files changed, 82 insertions, 40 deletions

diff --git a/src/mesa/main/enums.c b/src/mesa/main/enums.c
index 5dbda02dfb..9c49a810be 100644
--- a/src/mesa/main/enums.c
+++ b/src/mesa/main/enums.c
@@ -1,4 +1,4 @@
-/* $Id: enums.c,v 1.6 2000/02/05 01:52:05 brianp Exp $ */
+/* $Id: enums.c,v 1.7 2000/03/07 17:54:58 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -769,6 +769,9 @@ enum_elt all_enums[] =
    { "GL_CLIENT_ACTIVE_TEXTURE_ARB", 0x84E1 },
    { "GL_MAX_TEXTURE_UNITS_ARB", 0x84E2 },
 
+   { "GL_TEXTURE_FILTER_CONTROL_EXT", 0x8500 },
+   { "GL_TEXTUER_LOD_BIAS_EXT", 0x8501 },
+
    { "GL_NORMAL_MAP_NV", 0x8511 },
    { "GL_REFLECTION_MAP_NV", 0x8512 },
 
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index b3b7a05382..b6ff6d1293 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -1,4 +1,4 @@
-/* $Id: extensions.c,v 1.18 2000/02/25 03:55:40 keithw Exp $ */
+/* $Id: extensions.c,v 1.19 2000/03/07 17:54:58 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -41,7 +41,7 @@
 
 struct extension {
    struct extension *next, *prev;
-   int enabled;
+   GLint enabled;
    char name[MAX_EXT_NAMELEN+1];
    void (*notify)( GLcontext *, GLboolean ); 
 };
@@ -77,9 +77,23 @@ static struct { int enabled; const char *name; } default_extensions[] = {
    { ALWAYS_ENABLED, "GL_ARB_tranpose_matrix" },
    { DEFAULT_OFF,    "GL_EXT_vertex_array_set" },
    { DEFAULT_OFF,    "GL_EXT_texture_env" },
+   { DEFAULT_ON,     "GL_EXT_texture_lod_bias" }
 };
 
 
+/*
+ * Update the boolean convenience flags in the Extensions struct.
+ */
+static void
+update_extension_flags( GLcontext *ctx )
+{
+   /* Update flags */
+   ctx->Extensions.HaveTextureEnvAdd = gl_extension_is_enabled(ctx, "GL_EXT_texture_env_add");
+   ctx->Extensions.HaveTextureLodBias = gl_extension_is_enabled(ctx, "GL_EXT_texture_lod_bias");
+}
+
+
+
 int gl_extensions_add( GLcontext *ctx, 
 		       int state, 
 		       const char *name, 
@@ -101,21 +115,26 @@ int gl_extensions_add( GLcontext *ctx,
 }
 
 
-static int set_extension( GLcontext *ctx, const char *name, GLuint state )
+/*
+ * Either enable or disable the named extension.
+ */
+static int set_extension( GLcontext *ctx, const char *name, GLint state )
 {
    struct extension *i;
    foreach( i, ctx->Extensions.ext_list ) 
       if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0) 
 	 break;
 
-   if (i == ctx->Extensions.ext_list) return 1;
+   if (i == ctx->Extensions.ext_list)
+      return 1;
 
-   if (i->enabled && !(i->enabled & ALWAYS_ENABLED))
-   {
+   if (i->enabled && !(i->enabled & ALWAYS_ENABLED)) {
       if (i->notify) i->notify( ctx, state );      
       i->enabled = state;
    }
 
+   update_extension_flags(ctx);
+
    return 0;
 }   
 
@@ -189,6 +208,7 @@ void gl_extensions_ctr( GLcontext *ctx )
 			 default_extensions[i].name,
 			 0 );
    }
+   update_extension_flags(ctx);
 }
 
 
diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c
index e5f901255b..2993be4522 100644
--- a/src/mesa/main/texstate.c
+++ b/src/mesa/main/texstate.c
@@ -1,4 +1,4 @@
-/* $Id: texstate.c,v 1.8 2000/03/07 17:11:29 brianp Exp $ */
+/* $Id: texstate.c,v 1.9 2000/03/07 17:54:58 brianp Exp $ */
 
 /*
  * Mesa 3-D graphics library
@@ -69,35 +69,24 @@ _mesa_TexEnvfv( GLenum target, GLenum pname, const GLfloat *param )
 
    ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glTexEnv");
 
-   if (target!=GL_TEXTURE_ENV) {
-      gl_error( ctx, GL_INVALID_ENUM, "glTexEnv(target)" );
-      return;
-   }
+   if (target==GL_TEXTURE_ENV) {
 
-   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
-      fprintf(stderr, "glTexEnv %s %s %.1f(%s) ...\n",  
-	      gl_lookup_enum_by_nr(target),
-	      gl_lookup_enum_by_nr(pname),
-	      *param,
-	      gl_lookup_enum_by_nr((GLenum) (GLint) *param));
-
-
-   if (pname==GL_TEXTURE_ENV_MODE) {
-      GLenum mode = (GLenum) (GLint) *param;
-      switch (mode) {
-         case GL_ADD:
-            if (!gl_extension_is_enabled(ctx, "GL_EXT_texture_env_add")) {
-               gl_error(ctx, GL_INVALID_ENUM, "glTexEnv(param)");
-               return;
-            }
-            /* FALL-THROUGH */
-         case GL_MODULATE:
-         case GL_BLEND:
-         case GL_DECAL:
-         case GL_REPLACE:
+      if (pname==GL_TEXTURE_ENV_MODE) {
+	 GLenum mode = (GLenum) (GLint) *param;
+	 switch (mode) {
+	 case GL_ADD:
+	    if (!ctx->Extensions.HaveTextureEnvAdd) {
+	       gl_error(ctx, GL_INVALID_ENUM, "glTexEnv(param)");
+	       return;
+	    }
+	    /* FALL-THROUGH */
+	 case GL_MODULATE:
+	 case GL_BLEND:
+	 case GL_DECAL:
+	 case GL_REPLACE:
 	    /* A small optimization for drivers */ 
 	    if (texUnit->EnvMode == mode)
-               return;
+	       return;
 
 	    if (MESA_VERBOSE & (VERBOSE_STATE|VERBOSE_TEXTURE))
 	       fprintf(stderr, "glTexEnv: old mode %s, new mode %s\n",
@@ -110,23 +99,53 @@ _mesa_TexEnvfv( GLenum target, GLenum pname, const GLfloat *param )
 	 default:
 	    gl_error( ctx, GL_INVALID_VALUE, "glTexEnv(param)" );
 	    return;
+	 }
+      }
+      else if (pname==GL_TEXTURE_ENV_COLOR) {
+	 texUnit->EnvColor[0] = CLAMP( param[0], 0.0F, 1.0F );
+	 texUnit->EnvColor[1] = CLAMP( param[1], 0.0F, 1.0F );
+	 texUnit->EnvColor[2] = CLAMP( param[2], 0.0F, 1.0F );
+	 texUnit->EnvColor[3] = CLAMP( param[3], 0.0F, 1.0F );
+      }
+      else {
+	 gl_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname)" );
+	 return;
       }
+
    }
-   else if (pname==GL_TEXTURE_ENV_COLOR) {
-      texUnit->EnvColor[0] = CLAMP( param[0], 0.0F, 1.0F );
-      texUnit->EnvColor[1] = CLAMP( param[1], 0.0F, 1.0F );
-      texUnit->EnvColor[2] = CLAMP( param[2], 0.0F, 1.0F );
-      texUnit->EnvColor[3] = CLAMP( param[3], 0.0F, 1.0F );
+   else if (target==GL_TEXTURE_FILTER_CONTROL_EXT) {
+
+      if (!ctx->Extensions.HaveTextureLodBias) {
+	 gl_error( ctx, GL_INVALID_ENUM, "glTexEnv(param)" );
+	 return;
+      }
+
+      if (pname==GL_TEXTURE_LOD_BIAS_EXT) {
+	 texUnit->LodBias = param[0];
+      }
+      else {
+	 gl_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname)" );
+	 return;
+      }
+
    }
    else {
-      gl_error( ctx, GL_INVALID_ENUM, "glTexEnv(pname)" );
+      gl_error( ctx, GL_INVALID_ENUM, "glTexEnv(target)" );
       return;
    }
 
+   if (MESA_VERBOSE&(VERBOSE_API|VERBOSE_TEXTURE))
+      fprintf(stderr, "glTexEnv %s %s %.1f(%s) ...\n",  
+	      gl_lookup_enum_by_nr(target),
+	      gl_lookup_enum_by_nr(pname),
+	      *param,
+	      gl_lookup_enum_by_nr((GLenum) (GLint) *param));
+
    /* Tell device driver about the new texture environment */
    if (ctx->Driver.TexEnv) {
       (*ctx->Driver.TexEnv)( ctx, target, pname, param );
    }
+
 }