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Diffstat (limited to 'src/mesa/swrast/s_fragprog.c')
-rw-r--r--src/mesa/swrast/s_fragprog.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_fragprog.c b/src/mesa/swrast/s_fragprog.c
index 09493873aa..b1501221ca 100644
--- a/src/mesa/swrast/s_fragprog.c
+++ b/src/mesa/swrast/s_fragprog.c
@@ -113,6 +113,10 @@ init_machine(GLcontext *ctx, struct gl_program_machine *machine,
/* Setup pointer to input attributes */
machine->Attribs = span->array->attribs;
+ machine->DerivX = (GLfloat (*)[4]) span->attrStepX;
+ machine->DerivY = (GLfloat (*)[4]) span->attrStepY;
+ machine->NumDeriv = FRAG_ATTRIB_MAX;
+
if (ctx->Shader.CurrentProgram) {
/* Store front/back facing value in register FOGC.Y */
machine->Attribs[FRAG_ATTRIB_FOGC][col][1] = (GLfloat) ctx->_Facing;