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-rw-r--r--src/mesa/drivers/dri/r300/r300_reg.h6
-rw-r--r--src/mesa/drivers/dri/r300/r300_state.c14
2 files changed, 19 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/r300/r300_reg.h b/src/mesa/drivers/dri/r300/r300_reg.h
index 9356c48b8d..f98af8e1d2 100644
--- a/src/mesa/drivers/dri/r300/r300_reg.h
+++ b/src/mesa/drivers/dri/r300/r300_reg.h
@@ -628,11 +628,17 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
* Set INTERP_USED on all interpolators that produce data used by
* the fragment program. INTERP_USED looks like a swizzling mask,
* but I haven't seen it used that way.
+ *
+ * Note: The _UNKNOWN constants are always set in their respective
+ * register. I don't know if this is necessary.
*/
#define R300_RS_INTERP_0 0x4310
#define R300_RS_INTERP_1 0x4314
+# define R300_RS_INTERP_1_UNKNOWN 0x40
#define R300_RS_INTERP_2 0x4318
+# define R300_RS_INTERP_2_UNKNOWN 0x80
#define R300_RS_INTERP_3 0x431C
+# define R300_RS_INTERP_3_UNKNOWN 0xC0
#define R300_RS_INTERP_4 0x4320
#define R300_RS_INTERP_5 0x4324
#define R300_RS_INTERP_6 0x4328
diff --git a/src/mesa/drivers/dri/r300/r300_state.c b/src/mesa/drivers/dri/r300/r300_state.c
index 22d780a096..a9b20622e4 100644
--- a/src/mesa/drivers/dri/r300/r300_state.c
+++ b/src/mesa/drivers/dri/r300/r300_state.c
@@ -1354,6 +1354,17 @@ union r300_outputs_written {
static void r300SetupRSUnit(GLcontext * ctx)
{
r300ContextPtr r300 = R300_CONTEXT(ctx);
+ /* I'm still unsure if these are needed */
+ GLuint interp_magic[8] = {
+ 0x00,
+ R300_RS_INTERP_1_UNKNOWN,
+ R300_RS_INTERP_2_UNKNOWN,
+ R300_RS_INTERP_3_UNKNOWN,
+ 0x00,
+ 0x00,
+ 0x00,
+ 0x00
+ };
union r300_outputs_written OutputsWritten;
GLuint InputsRead;
int fp_reg, high_rr;
@@ -1399,7 +1410,8 @@ static void r300SetupRSUnit(GLcontext * ctx)
for (i = 0; i < ctx->Const.MaxTextureUnits; i++) {
r300->hw.ri.cmd[R300_RI_INTERP_0 + i] = 0
| R300_RS_INTERP_USED
- | (in_texcoords << R300_RS_INTERP_SRC_SHIFT);
+ | (in_texcoords << R300_RS_INTERP_SRC_SHIFT)
+ | interp_magic[i];
r300->hw.rr.cmd[R300_RR_ROUTE_0 + fp_reg] = 0;
if (InputsRead & (FRAG_BIT_TEX0 << i)) {