diff options
| -rw-r--r-- | src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c | 152 |
1 files changed, 129 insertions, 23 deletions
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c index 1ba139c6cd4..fe41d5ee493 100644 --- a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c +++ b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c @@ -83,17 +83,92 @@ struct lp_build_sample_context }; +/** + * Does the given texture wrap mode allow sampling the texture border color? + * XXX maybe move this into gallium util code. + */ +static boolean +wrap_mode_uses_border_color(unsigned mode) +{ + switch (mode) { + case PIPE_TEX_WRAP_REPEAT: + case PIPE_TEX_WRAP_CLAMP_TO_EDGE: + case PIPE_TEX_WRAP_MIRROR_REPEAT: + case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE: + return FALSE; + case PIPE_TEX_WRAP_CLAMP: + case PIPE_TEX_WRAP_CLAMP_TO_BORDER: + case PIPE_TEX_WRAP_MIRROR_CLAMP: + case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_BORDER: + return TRUE; + default: + assert(0 && "unexpected wrap mode"); + return FALSE; + } +} + + + +/** + * Gen code to fetch a texel from a texture at int coords (x, y). + * The result, texel, will be: + * texel[0] = red values + * texel[1] = green values + * texel[2] = blue values + * texel[3] = alpha values + */ static void lp_build_sample_texel_soa(struct lp_build_sample_context *bld, + LLVMValueRef width, + LLVMValueRef height, LLVMValueRef x, LLVMValueRef y, LLVMValueRef y_stride, LLVMValueRef data_ptr, LLVMValueRef *texel) { + struct lp_build_context *int_coord_bld = &bld->int_coord_bld; LLVMValueRef offset; LLVMValueRef packed; + LLVMValueRef use_border = NULL; + + /* use_border = x < 0 || x >= width || y < 0 || y >= height */ + if (wrap_mode_uses_border_color(bld->static_state->wrap_s)) { + LLVMValueRef b1, b2; + b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, x, int_coord_bld->zero); + b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, x, width); + use_border = LLVMBuildOr(bld->builder, b1, b2, "b1_or_b2"); + } + + if (wrap_mode_uses_border_color(bld->static_state->wrap_t)) { + LLVMValueRef b1, b2; + b1 = lp_build_cmp(int_coord_bld, PIPE_FUNC_LESS, y, int_coord_bld->zero); + b2 = lp_build_cmp(int_coord_bld, PIPE_FUNC_GEQUAL, y, height); + if (use_border) { + use_border = LLVMBuildOr(bld->builder, use_border, b1, "ub_or_b1"); + use_border = LLVMBuildOr(bld->builder, use_border, b2, "ub_or_b2"); + } + else { + use_border = LLVMBuildOr(bld->builder, b1, b2, "b1_or_b2"); + } + } + /* + * Note: if we find an app which frequently samples the texture border + * we might want to implement a true conditional here to avoid sampling + * the texture whenever possible (since that's quite a bit of code). + * Ex: + * if (use_border) { + * texel = border_color; + * } + * else { + * texel = sample_texture(coord); + * } + * As it is now, we always sample the texture, then selectively replace + * the texel color results with the border color. + */ + + /* convert x,y coords to linear offset from start of texture, in bytes */ offset = lp_build_sample_offset(&bld->uint_coord_bld, bld->format_desc, x, y, y_stride, @@ -103,16 +178,30 @@ lp_build_sample_texel_soa(struct lp_build_sample_context *bld, assert(bld->format_desc->block.height == 1); assert(bld->format_desc->block.bits <= bld->texel_type.width); + /* gather the texels from the texture */ packed = lp_build_gather(bld->builder, bld->texel_type.length, bld->format_desc->block.bits, bld->texel_type.width, data_ptr, offset); + /* convert texels to float rgba */ lp_build_unpack_rgba_soa(bld->builder, bld->format_desc, bld->texel_type, packed, texel); + + if (use_border) { + /* select texel color or border color depending on use_border */ + int chan; + for (chan = 0; chan < 4; chan++) { + LLVMValueRef border_chan = + lp_build_const_scalar(bld->texel_type, + bld->static_state->border_color[chan]); + texel[chan] = lp_build_select(&bld->texel_bld, use_border, + border_chan, texel[chan]); + } + } } @@ -180,14 +269,14 @@ lp_build_coord_mirror(struct lp_build_sample_context *bld, * Return whether the given mode is supported by that function. */ static boolean -is_simple_wrap_mode(int mode) +is_simple_wrap_mode(unsigned mode) { switch (mode) { case PIPE_TEX_WRAP_REPEAT: case PIPE_TEX_WRAP_CLAMP: case PIPE_TEX_WRAP_CLAMP_TO_EDGE: - case PIPE_TEX_WRAP_CLAMP_TO_BORDER: return TRUE; + case PIPE_TEX_WRAP_CLAMP_TO_BORDER: default: return FALSE; } @@ -339,14 +428,15 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld, /* min = -1.0 / (2 * length) */ min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f)); min = lp_build_negate(coord_bld, min); - /* max = length - min */ - max = lp_build_sub(coord_bld, length_f, min); + /* max = 1.0 - min */ + max = lp_build_sub(coord_bld, coord_bld->one, min); + /* coord = clamp(coord, min, max) */ + coord = lp_build_clamp(coord_bld, coord, min, max); /* scale coord to length (and sub 0.5?) */ coord = lp_build_mul(coord_bld, coord, length_f); + coord = lp_build_sub(coord_bld, coord, half); /* compute lerp weight */ weight = lp_build_fract(coord_bld, coord); - /* coord = clamp(coord, min, max) */ - coord = lp_build_clamp(coord_bld, coord, min, max); /* convert to int */ coord0 = lp_build_ifloor(coord_bld, coord); coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); @@ -375,12 +465,21 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld, break; case PIPE_TEX_WRAP_MIRROR_CLAMP: - coord = lp_build_abs(coord_bld, coord); - coord = lp_build_mul(coord_bld, coord, length_f); - weight = lp_build_fract(coord_bld, coord); - coord = lp_build_clamp(coord_bld, coord, coord_bld->zero, length_f_minus_one); - coord0 = lp_build_ifloor(coord_bld, coord); - coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); + { + LLVMValueRef min, max; + /* min = 1.0 / (2 * length) */ + min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f)); + /* max = 1.0 - min */ + max = lp_build_sub(coord_bld, coord_bld->one, min); + + coord = lp_build_abs(coord_bld, coord); + coord = lp_build_clamp(coord_bld, coord, min, max); + coord = lp_build_mul(coord_bld, coord, length_f); + if(0)coord = lp_build_sub(coord_bld, coord, half); + weight = lp_build_fract(coord_bld, coord); + coord0 = lp_build_ifloor(coord_bld, coord); + coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); + } break; case PIPE_TEX_WRAP_MIRROR_CLAMP_TO_EDGE: @@ -388,13 +487,14 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld, LLVMValueRef min, max; /* min = 1.0 / (2 * length) */ min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f)); - /* max = length - min */ - max = lp_build_sub(coord_bld, length_f, min); + /* max = 1.0 - min */ + max = lp_build_sub(coord_bld, coord_bld->one, min); coord = lp_build_abs(coord_bld, coord); + coord = lp_build_clamp(coord_bld, coord, min, max); coord = lp_build_mul(coord_bld, coord, length_f); + coord = lp_build_sub(coord_bld, coord, half); weight = lp_build_fract(coord_bld, coord); - coord = lp_build_clamp(coord_bld, coord, min, max); coord0 = lp_build_ifloor(coord_bld, coord); coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); } @@ -406,13 +506,14 @@ lp_build_sample_wrap_linear(struct lp_build_sample_context *bld, /* min = -1.0 / (2 * length) */ min = lp_build_rcp(coord_bld, lp_build_mul(coord_bld, two, length_f)); min = lp_build_negate(coord_bld, min); - /* max = length - min */ - max = lp_build_sub(coord_bld, length_f, min); + /* max = 1.0 - min */ + max = lp_build_sub(coord_bld, coord_bld->one, min); coord = lp_build_abs(coord_bld, coord); + coord = lp_build_clamp(coord_bld, coord, min, max); coord = lp_build_mul(coord_bld, coord, length_f); + coord = lp_build_sub(coord_bld, coord, half); weight = lp_build_fract(coord_bld, coord); - coord = lp_build_clamp(coord_bld, coord, min, max); coord0 = lp_build_ifloor(coord_bld, coord); coord1 = lp_build_add(int_coord_bld, coord0, int_coord_bld->one); } @@ -598,7 +699,7 @@ lp_build_sample_2d_nearest_soa(struct lp_build_sample_context *bld, lp_build_name(x, "tex.x.wrapped"); lp_build_name(y, "tex.y.wrapped"); - lp_build_sample_texel_soa(bld, x, y, stride, data_ptr, texel); + lp_build_sample_texel_soa(bld, width, height, x, y, stride, data_ptr, texel); } @@ -627,10 +728,10 @@ lp_build_sample_2d_linear_soa(struct lp_build_sample_context *bld, lp_build_sample_wrap_linear(bld, t, height, bld->static_state->pot_height, bld->static_state->wrap_t, &y0, &y1, &t_fpart); - lp_build_sample_texel_soa(bld, x0, y0, stride, data_ptr, neighbors[0][0]); - lp_build_sample_texel_soa(bld, x1, y0, stride, data_ptr, neighbors[0][1]); - lp_build_sample_texel_soa(bld, x0, y1, stride, data_ptr, neighbors[1][0]); - lp_build_sample_texel_soa(bld, x1, y1, stride, data_ptr, neighbors[1][1]); + lp_build_sample_texel_soa(bld, width, height, x0, y0, stride, data_ptr, neighbors[0][0]); + lp_build_sample_texel_soa(bld, width, height, x1, y0, stride, data_ptr, neighbors[0][1]); + lp_build_sample_texel_soa(bld, width, height, x0, y1, stride, data_ptr, neighbors[1][0]); + lp_build_sample_texel_soa(bld, width, height, x1, y1, stride, data_ptr, neighbors[1][1]); /* TODO: Don't interpolate missing channels */ for(chan = 0; chan < 4; ++chan) { @@ -907,6 +1008,11 @@ lp_build_sample_compare(struct lp_build_sample_context *bld, } +/** + * Build texture sampling code. + * 'texel' will return a vector of four LLVMValueRefs corresponding to + * R, G, B, A. + */ void lp_build_sample_soa(LLVMBuilderRef builder, const struct lp_sampler_static_state *static_state, |