This adds seamless sampling for cubemap boundaries if requested.
The corner case averaging is messy but seems like it should be spec
compliant.
The face direction stuff is also a bit messy, I've no idea if that could
or should be simpler, or even if all my directions are fully correct!
Signed-off-by: Dave Airlie <airl...@redhat.com>
---
src/gallium/drivers/softpipe/sp_screen.c | 2 +-
src/gallium/drivers/softpipe/sp_tex_sample.c | 143 +++++++++++++++++++++++++--
2 files changed, 135 insertions(+), 10 deletions(-)
diff --git a/src/gallium/drivers/softpipe/sp_screen.c
b/src/gallium/drivers/softpipe/sp_screen.c
index 909fa1c..7ca259e 100644
--- a/src/gallium/drivers/softpipe/sp_screen.c
+++ b/src/gallium/drivers/softpipe/sp_screen.c
@@ -127,7 +127,7 @@ softpipe_get_param(struct pipe_screen *screen, enum
pipe_cap param)
return 1;
case PIPE_CAP_SEAMLESS_CUBE_MAP:
case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
- return 0;
+ return 1;
case PIPE_CAP_SCALED_RESOLVE:
return 0;
case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.c
b/src/gallium/drivers/softpipe/sp_tex_sample.c
index 7558ef1..9500a03 100644
--- a/src/gallium/drivers/softpipe/sp_tex_sample.c
+++ b/src/gallium/drivers/softpipe/sp_tex_sample.c
@@ -607,6 +607,100 @@ get_texel_2d(const struct sp_sampler_variant *samp,
}
}
+static const unsigned face_array[PIPE_TEX_FACE_MAX][4] = {
+ /* pos X first then neg X is Z different, Y the same */
+ /* PIPE_TEX_FACE_POS_X,*/
+ { PIPE_TEX_FACE_POS_Z, PIPE_TEX_FACE_NEG_Z,
+ PIPE_TEX_FACE_NEG_Y, PIPE_TEX_FACE_POS_Y },
+ /* PIPE_TEX_FACE_NEG_X */
+ { PIPE_TEX_FACE_NEG_Z, PIPE_TEX_FACE_POS_Z,
+ PIPE_TEX_FACE_NEG_Y, PIPE_TEX_FACE_POS_Y },
+
+ /* pos Y first then neg Y is X different, X the same */
+ /* PIPE_TEX_FACE_POS_Y */
+ { PIPE_TEX_FACE_NEG_X, PIPE_TEX_FACE_POS_X,
+ PIPE_TEX_FACE_POS_Z, PIPE_TEX_FACE_NEG_Z },
+
+ /* PIPE_TEX_FACE_NEG_Y */
+ { PIPE_TEX_FACE_NEG_X, PIPE_TEX_FACE_POS_X,
+ PIPE_TEX_FACE_NEG_Z, PIPE_TEX_FACE_POS_Z },
+
+ /* pos Z first then neg Y is X different, X the same */
+ /* PIPE_TEX_FACE_POS_Z */
+ { PIPE_TEX_FACE_NEG_X, PIPE_TEX_FACE_POS_X,
+ PIPE_TEX_FACE_NEG_Y, PIPE_TEX_FACE_POS_Y },
+
+ /* PIPE_TEX_FACE_NEG_Z */
+ { PIPE_TEX_FACE_POS_X, PIPE_TEX_FACE_NEG_X,
+ PIPE_TEX_FACE_NEG_Y, PIPE_TEX_FACE_POS_Y }
+};
+
+static INLINE unsigned
+get_next_face(unsigned face, int x, int y)
+{
+ int idx = 0;
+
+ if (x == 0 && y == 0)
+ return face;
+ if (x == -1) idx = 0;
+ else if (x == 1) idx = 1;
+ else if (y == -1) idx = 2;
+ else if (y == 1) idx = 3;
+
+ return face_array[face][idx];
+}
+
+static INLINE const float *
+get_texel_cube_seamless(const struct sp_sampler_variant *samp,
+ union tex_tile_address addr, int x, int y,
+ float *corner)
+{
+ const struct pipe_resource *texture = samp->view->texture;
+ unsigned level = addr.bits.level;
+ unsigned face = addr.bits.face;
+ int new_x, new_y;
+ int max_x, max_y;
+ int c;
+
+ max_x = (int) u_minify(texture->width0, level);
+ max_y = (int) u_minify(texture->height0, level);
+ new_x = x;
+ new_y = y;
+
+ /* the corner case */
+ if ((x < 0 || x >= max_x) &&
+ (y < 0 || y >= max_y)) {
+ const float *c1, *c2, *c3;
+ int fx = x < 0 ? 0 : max_x - 1;
+ int fy = y < 0 ? 0 : max_y - 1;
+ c1 = get_texel_2d_no_border( samp, addr, fx, fy);
+ addr.bits.face = get_next_face(face, (x < 0) ? -1 : 1, 0);
+ c2 = get_texel_2d_no_border( samp, addr, (x < 0) ? max_x - 1 : 0, fy);
+ addr.bits.face = get_next_face(face, 0, (y < 0) ? -1 : 1);
+ c3 = get_texel_2d_no_border( samp, addr, fx, (y < 0) ? max_y - 1 : 0);
+ for (c = 0; c < TGSI_QUAD_SIZE; c++)
+ corner[c] = CLAMP((c1[c] + c2[c] + c3[c]), 0.0F, 1.0F) / 3;
+
+ return corner;
+ }
+ /* change the face */
+ if (x < 0) {
+ new_x = max_x - 1;
+ face = get_next_face(face, -1, 0);
+ } else if (x >= max_x) {
+ new_x = 0;
+ face = get_next_face(face, 1, 0);
+ } else if (y < 0) {
+ new_y = max_y - 1;
+ face = get_next_face(face, 0, -1);
+ } else if (y >= max_y) {
+ new_y = 0;
+ face = get_next_face(face, 0, 1);
+ }
+
+ addr.bits.face = face;
+ return get_texel_2d_no_border( samp, addr, new_x, new_y );
+}
/* Gather a quad of adjacent texels within a tile:
*/
@@ -1121,6 +1215,7 @@ img_filter_cube_nearest(struct tgsi_sampler *tgsi_sampler,
union tex_tile_address addr;
const float *out;
int c;
+ float corner0[TGSI_QUAD_SIZE];
width = u_minify(texture->width0, level);
height = u_minify(texture->height0, level);
@@ -1131,10 +1226,23 @@ img_filter_cube_nearest(struct tgsi_sampler
*tgsi_sampler,
addr.value = 0;
addr.bits.level = level;
- samp->nearest_texcoord_s(s, width, &x);
- samp->nearest_texcoord_t(t, height, &y);
+ /*
+ * If NEAREST filtering is done within a miplevel, always apply wrap
+ * mode CLAMP_TO_EDGE.
+ */
+ if (samp->sampler->seamless_cube_map) {
+ wrap_nearest_clamp_to_edge(s, width, &x);
+ wrap_nearest_clamp_to_edge(t, height, &y);
+ } else {
+ samp->nearest_texcoord_s(s, width, &x);
+ samp->nearest_texcoord_t(t, height, &y);
+ }
- out = get_texel_2d(samp, face(addr, face_id), x, y);
+ if (samp->sampler->seamless_cube_map) {
+ out = get_texel_cube_seamless(samp, face(addr, face_id), x, y, corner0);
+ } else {
+ out = get_texel_2d(samp, face(addr, face_id), x, y);
+ }
for (c = 0; c < TGSI_QUAD_SIZE; c++)
rgba[TGSI_NUM_CHANNELS*c] = out[c];
@@ -1403,6 +1511,7 @@ img_filter_cube_linear(struct tgsi_sampler *tgsi_sampler,
float xw, yw; /* weights */
union tex_tile_address addr, addrj;
const float *tx0, *tx1, *tx2, *tx3;
+ float corner0[TGSI_QUAD_SIZE], corner1[TGSI_QUAD_SIZE],
corner2[TGSI_QUAD_SIZE], corner3[TGSI_QUAD_SIZE];
int c;
width = u_minify(texture->width0, level);
@@ -1414,15 +1523,31 @@ img_filter_cube_linear(struct tgsi_sampler
*tgsi_sampler,
addr.value = 0;
addr.bits.level = level;
- samp->linear_texcoord_s(s, width, &x0, &x1, &xw);
- samp->linear_texcoord_t(t, height, &y0, &y1, &yw);
+ /* For seamless,
+ * if LINEAR filtering is done within a miplevel, always apply wrap mode
+ * CLAMP_TO_BORDER.
+ */
+ if (samp->sampler->seamless_cube_map) {
+ wrap_linear_clamp_to_border(s, width, &x0, &x1, &xw);
+ wrap_linear_clamp_to_border(t, height, &y0, &y1, &yw);
+ } else {
+ samp->linear_texcoord_s(s, width, &x0, &x1, &xw);
+ samp->linear_texcoord_t(t, height, &y0, &y1, &yw);
+ }
addrj = face(addr, face_id);
- tx0 = get_texel_2d(samp, addrj, x0, y0);
- tx1 = get_texel_2d(samp, addrj, x1, y0);
- tx2 = get_texel_2d(samp, addrj, x0, y1);
- tx3 = get_texel_2d(samp, addrj, x1, y1);
+ if (samp->sampler->seamless_cube_map) {
+ tx0 = get_texel_cube_seamless(samp, addrj, x0, y0, corner0);
+ tx1 = get_texel_cube_seamless(samp, addrj, x1, y0, corner1);
+ tx2 = get_texel_cube_seamless(samp, addrj, x0, y1, corner2);
+ tx3 = get_texel_cube_seamless(samp, addrj, x1, y1, corner3);
+ } else {
+ tx0 = get_texel_2d(samp, addrj, x0, y0);
+ tx1 = get_texel_2d(samp, addrj, x1, y0);
+ tx2 = get_texel_2d(samp, addrj, x0, y1);
+ tx3 = get_texel_2d(samp, addrj, x1, y1);
+ }
/* interpolate R, G, B, A */
for (c = 0; c < TGSI_QUAD_SIZE; c++)
rgba[TGSI_NUM_CHANNELS*c] = lerp_2d(xw, yw,
--
1.8.0.1
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