r600g: fix some of the interpolation tests.

This enables linear gradients if we need a linear,
it also sets the flat shade flag for color/constant interpolations.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/src/gallium/drivers/r600/r600_state.c b/src/gallium/drivers/r600/r600_state.c
index 513fd17..a03c496 100644 (file)
--- a/src/gallium/drivers/r600/r600_state.c
+++ b/src/gallium/drivers/r600/r600_state.c
@@ -2076,6 +2076,7 @@ void r600_pipe_shader_ps(struct pipe_context *ctx, struct r600_pipe_shader *shad
        unsigned i, exports_ps, num_cout, spi_ps_in_control_0, spi_input_z, spi_ps_in_control_1, db_shader_control;
        int pos_index = -1, face_index = -1;
        unsigned tmp, sid, ufi = 0;
+       int need_linear = 0;
 
        rstate->nregs = 0;
 
@@ -2089,11 +2090,12 @@ void r600_pipe_shader_ps(struct pipe_context *ctx, struct r600_pipe_shader *shad
 
                tmp = S_028644_SEMANTIC(sid);
 
-               if (rshader->input[i].name == TGSI_SEMANTIC_COLOR ||
-                               rshader->input[i].name == TGSI_SEMANTIC_BCOLOR ||
-                               rshader->input[i].name == TGSI_SEMANTIC_POSITION) {
+               if (rshader->input[i].name == TGSI_SEMANTIC_POSITION) {
                        tmp |= S_028644_FLAT_SHADE(1);
                }
+               if (rshader->input[i].interpolate == TGSI_INTERPOLATE_COLOR ||
+                   rshader->input[i].interpolate == TGSI_INTERPOLATE_CONSTANT)
+                       tmp |= S_028644_FLAT_SHADE(1);
 
                if (rshader->input[i].name == TGSI_SEMANTIC_GENERIC &&
                                rctx->sprite_coord_enable & (1 << rshader->input[i].sid)) {
@@ -2103,8 +2105,10 @@ void r600_pipe_shader_ps(struct pipe_context *ctx, struct r600_pipe_shader *shad
                if (rshader->input[i].centroid)
                        tmp |= S_028644_SEL_CENTROID(1);
 
-               if (rshader->input[i].interpolate == TGSI_INTERPOLATE_LINEAR)
+               if (rshader->input[i].interpolate == TGSI_INTERPOLATE_LINEAR) {
+                       need_linear = 1;
                        tmp |= S_028644_SEL_LINEAR(1);
+               }
 
                r600_pipe_state_add_reg(rstate, R_028644_SPI_PS_INPUT_CNTL_0 + i * 4,
                                tmp, 0xFFFFFFFF, NULL, 0);
@@ -2137,7 +2141,8 @@ void r600_pipe_shader_ps(struct pipe_context *ctx, struct r600_pipe_shader *shad
        }
 
        spi_ps_in_control_0 = S_0286CC_NUM_INTERP(rshader->ninput) |
-                               S_0286CC_PERSP_GRADIENT_ENA(1);
+                               S_0286CC_PERSP_GRADIENT_ENA(1)|
+                               S_0286CC_LINEAR_GRADIENT_ENA(need_linear);
        spi_input_z = 0;
        if (pos_index != -1) {
                spi_ps_in_control_0 |= (S_0286CC_POSITION_ENA(1) |