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-rw-r--r--src/mesa/main/texstate.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c
index d15af22b7d..fb02443779 100644
--- a/src/mesa/main/texstate.c
+++ b/src/mesa/main/texstate.c
@@ -1178,6 +1178,36 @@ _mesa_TexParameterf( GLenum target, GLenum pname, GLfloat param )
}
+/**
+ * Update derrived compare function state.
+ */
+void
+_mesa_update_texture_compare_function(struct gl_texture_object *tObj,
+ GLboolean in_frag_prog)
+{
+ if (in_frag_prog) {
+ tObj->_Function = GL_NONE;
+ }
+ else if (tObj->CompareFlag) {
+ /* GL_SGIX_shadow */
+ if (tObj->CompareOperator == GL_TEXTURE_LEQUAL_R_SGIX) {
+ tObj->_Function = GL_LEQUAL;
+ }
+ else {
+ ASSERT(tObj->CompareOperator == GL_TEXTURE_GEQUAL_R_SGIX);
+ tObj->_Function = GL_GEQUAL;
+ }
+ }
+ else if (tObj->CompareMode == GL_COMPARE_R_TO_TEXTURE_ARB) {
+ /* GL_ARB_shadow */
+ tObj->_Function = tObj->CompareFunc;
+ }
+ else {
+ tObj->_Function = GL_NONE; /* pass depth through as grayscale */
+ }
+}
+
+
void GLAPIENTRY
_mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
{
@@ -1385,6 +1415,7 @@ _mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
if (ctx->Extensions.SGIX_shadow) {
FLUSH_VERTICES(ctx, _NEW_TEXTURE);
texObj->CompareFlag = params[0] ? GL_TRUE : GL_FALSE;
+ _mesa_update_texture_compare_function(texObj, GL_FALSE);
}
else {
_mesa_error(ctx, GL_INVALID_ENUM,
@@ -1399,6 +1430,7 @@ _mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
op == GL_TEXTURE_GEQUAL_R_SGIX) {
FLUSH_VERTICES(ctx, _NEW_TEXTURE);
texObj->CompareOperator = op;
+ _mesa_update_texture_compare_function(texObj, GL_FALSE);
}
else {
_mesa_error(ctx, GL_INVALID_ENUM, "glTexParameter(param)");
@@ -1437,6 +1469,7 @@ _mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
if (mode == GL_NONE || mode == GL_COMPARE_R_TO_TEXTURE_ARB) {
FLUSH_VERTICES(ctx, _NEW_TEXTURE);
texObj->CompareMode = mode;
+ _mesa_update_texture_compare_function(texObj, GL_FALSE);
}
else {
_mesa_error(ctx, GL_INVALID_ENUM,
@@ -1472,6 +1505,8 @@ _mesa_TexParameterfv( GLenum target, GLenum pname, const GLfloat *params )
"glTexParameter(bad GL_TEXTURE_COMPARE_FUNC_ARB)");
return;
}
+
+ _mesa_update_texture_compare_function(texObj, GL_FALSE);
}
else {
_mesa_error(ctx, GL_INVALID_ENUM,