nir: Fix interaction of GL_CLAMP lowering with texture offsets.
We want the clamping of the coordinate to apply after the offset, so we need to do math to lower the offset out of the instruction. Fixes texwrap offset cases for GL_CLAMP with GL_NEAREST on vc5. Note: I moved the get_texture_size() verbatim, so that it was defined before use. Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
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@ -101,54 +101,6 @@ project_src(nir_builder *b, nir_tex_instr *tex)
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nir_tex_instr_remove_src(tex, proj_index);
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}
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static bool
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lower_offset(nir_builder *b, nir_tex_instr *tex)
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{
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int offset_index = nir_tex_instr_src_index(tex, nir_tex_src_offset);
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if (offset_index < 0)
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return false;
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int coord_index = nir_tex_instr_src_index(tex, nir_tex_src_coord);
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assert(coord_index >= 0);
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assert(tex->src[offset_index].src.is_ssa);
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assert(tex->src[coord_index].src.is_ssa);
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nir_ssa_def *offset = tex->src[offset_index].src.ssa;
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nir_ssa_def *coord = tex->src[coord_index].src.ssa;
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b->cursor = nir_before_instr(&tex->instr);
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nir_ssa_def *offset_coord;
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if (nir_tex_instr_src_type(tex, coord_index) == nir_type_float) {
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assert(tex->sampler_dim == GLSL_SAMPLER_DIM_RECT);
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offset_coord = nir_fadd(b, coord, nir_i2f32(b, offset));
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} else {
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offset_coord = nir_iadd(b, coord, offset);
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}
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if (tex->is_array) {
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/* The offset is not applied to the array index */
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if (tex->coord_components == 2) {
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offset_coord = nir_vec2(b, nir_channel(b, offset_coord, 0),
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nir_channel(b, coord, 1));
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} else if (tex->coord_components == 3) {
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offset_coord = nir_vec3(b, nir_channel(b, offset_coord, 0),
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nir_channel(b, offset_coord, 1),
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nir_channel(b, coord, 2));
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} else {
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unreachable("Invalid number of components");
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}
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}
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nir_instr_rewrite_src(&tex->instr, &tex->src[coord_index].src,
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nir_src_for_ssa(offset_coord));
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nir_tex_instr_remove_src(tex, offset_index);
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return true;
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}
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static nir_ssa_def *
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get_texture_size(nir_builder *b, nir_tex_instr *tex)
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{
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@ -179,6 +131,62 @@ get_texture_size(nir_builder *b, nir_tex_instr *tex)
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return nir_i2f32(b, &txs->dest.ssa);
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}
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static bool
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lower_offset(nir_builder *b, nir_tex_instr *tex)
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{
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int offset_index = nir_tex_instr_src_index(tex, nir_tex_src_offset);
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if (offset_index < 0)
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return false;
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int coord_index = nir_tex_instr_src_index(tex, nir_tex_src_coord);
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assert(coord_index >= 0);
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assert(tex->src[offset_index].src.is_ssa);
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assert(tex->src[coord_index].src.is_ssa);
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nir_ssa_def *offset = tex->src[offset_index].src.ssa;
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nir_ssa_def *coord = tex->src[coord_index].src.ssa;
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b->cursor = nir_before_instr(&tex->instr);
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nir_ssa_def *offset_coord;
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if (nir_tex_instr_src_type(tex, coord_index) == nir_type_float) {
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if (tex->sampler_dim == GLSL_SAMPLER_DIM_RECT) {
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offset_coord = nir_fadd(b, coord, nir_i2f32(b, offset));
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} else {
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nir_ssa_def *txs = get_texture_size(b, tex);
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nir_ssa_def *scale = nir_frcp(b, txs);
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offset_coord = nir_fadd(b, coord,
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nir_fmul(b,
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nir_i2f32(b, offset),
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scale));
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}
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} else {
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offset_coord = nir_iadd(b, coord, offset);
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}
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if (tex->is_array) {
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/* The offset is not applied to the array index */
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if (tex->coord_components == 2) {
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offset_coord = nir_vec2(b, nir_channel(b, offset_coord, 0),
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nir_channel(b, coord, 1));
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} else if (tex->coord_components == 3) {
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offset_coord = nir_vec3(b, nir_channel(b, offset_coord, 0),
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nir_channel(b, offset_coord, 1),
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nir_channel(b, coord, 2));
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} else {
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unreachable("Invalid number of components");
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}
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}
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nir_instr_rewrite_src(&tex->instr, &tex->src[coord_index].src,
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nir_src_for_ssa(offset_coord));
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nir_tex_instr_remove_src(tex, offset_index);
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return true;
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}
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static void
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lower_rect(nir_builder *b, nir_tex_instr *tex)
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{
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@ -749,6 +757,7 @@ nir_lower_tex_block(nir_block *block, nir_builder *b,
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}
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if ((tex->op == nir_texop_txf && options->lower_txf_offset) ||
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(sat_mask && nir_tex_instr_src_index(tex, nir_tex_src_coord) >= 0) ||
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(tex->sampler_dim == GLSL_SAMPLER_DIM_RECT &&
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options->lower_rect_offset)) {
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progress = lower_offset(b, tex) || progress;
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