Prefer plain texture2D in legacy es vertex shaders
WebGL supports lod texture funcs only in fragment shaders but SPIR-V supports only lod texture funcs in vertex shaders. This reverts calls which were forced (infered from using a 0 constant) to use an lod to plain calls in vertex shaders when using legacy es.
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@ -2409,7 +2409,7 @@ void CompilerGLSL::emit_quaternary_func_op(uint32_t result_type, uint32_t result
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inherit_expression_dependencies(result_id, op3);
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}
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string CompilerGLSL::legacy_tex_op(const std::string &op, const SPIRType &imgtype)
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string CompilerGLSL::legacy_tex_op(const std::string &op, const SPIRType &imgtype, uint32_t lod)
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{
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const char *type;
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switch (imgtype.image.dim)
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@ -2437,22 +2437,32 @@ string CompilerGLSL::legacy_tex_op(const std::string &op, const SPIRType &imgtyp
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break;
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}
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auto *lod_constant = maybe_get<SPIRConstant>(lod);
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bool zero_lod = lod_constant && lod_constant->scalar_f32() == 0.0f;
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if (op == "textureLod" || op == "textureProjLod")
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{
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if (is_legacy_es())
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if (is_legacy_es() && !zero_lod)
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require_extension("GL_EXT_shader_texture_lod");
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else if (is_legacy())
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else if (is_legacy() && !is_legacy_es())
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require_extension("GL_ARB_shader_texture_lod");
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}
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if (op == "texture")
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return join("texture", type);
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else if (op == "textureLod")
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return join("texture", type, is_legacy_es() ? "LodEXT" : "Lod");
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else if (op == "textureLod") {
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if (is_legacy_es() && zero_lod)
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return join("texture", type);
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else
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return join("texture", type, is_legacy_es() ? "LodEXT" : "Lod");
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}
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else if (op == "textureProj")
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return join("texture", type, "Proj");
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else if (op == "textureProjLod")
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return join("texture", type, is_legacy_es() ? "ProjLodEXT" : "ProjLod");
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if (is_legacy_es() && zero_lod)
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return join("texture", type);
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else
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return join("texture", type, is_legacy_es() ? "ProjLodEXT" : "ProjLod");
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else
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{
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SPIRV_CROSS_THROW(join("Unsupported legacy texture op: ", op));
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@ -2775,7 +2785,7 @@ void CompilerGLSL::emit_texture_op(const Instruction &i)
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string expr;
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bool forward = false;
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expr += to_function_name(img, imgtype, !!fetch, !!gather, !!proj, !!coffsets, (!!coffset || !!offset),
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(!!grad_x || !!grad_y), !!lod, !!dref);
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(!!grad_x || !!grad_y), !!lod, !!dref, lod);
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expr += "(";
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expr += to_function_args(img, imgtype, fetch, gather, proj, coord, coord_components, dref, grad_x, grad_y, lod,
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coffset, offset, bias, comp, sample, &forward);
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@ -2787,7 +2797,7 @@ void CompilerGLSL::emit_texture_op(const Instruction &i)
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// Returns the function name for a texture sampling function for the specified image and sampling characteristics.
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// For some subclasses, the function is a method on the specified image.
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string CompilerGLSL::to_function_name(uint32_t, const SPIRType &imgtype, bool is_fetch, bool is_gather, bool is_proj,
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bool has_array_offsets, bool has_offset, bool has_grad, bool has_lod, bool)
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bool has_array_offsets, bool has_offset, bool has_grad, bool has_lod, bool, uint32_t lod)
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{
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string fname;
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@ -2812,7 +2822,7 @@ string CompilerGLSL::to_function_name(uint32_t, const SPIRType &imgtype, bool is
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if (has_offset)
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fname += "Offset";
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return is_legacy() ? legacy_tex_op(fname, imgtype) : fname;
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return is_legacy() ? legacy_tex_op(fname, imgtype, lod) : fname;
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}
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// Returns the function args for a texture sampling function for the specified image and sampling characteristics.
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@ -2894,9 +2904,14 @@ string CompilerGLSL::to_function_args(uint32_t img, const SPIRType &, bool, bool
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if (lod)
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{
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forward = forward && should_forward(lod);
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farg_str += ", ";
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farg_str += to_expression(lod);
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auto *lod_constant = maybe_get<SPIRConstant>(lod);
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bool zero_lod = lod_constant && lod_constant->scalar_f32() == 0.0f;
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if (!is_legacy_es() || !zero_lod)
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{
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forward = forward && should_forward(lod);
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farg_str += ", ";
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farg_str += to_expression(lod);
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}
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}
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if (coffset)
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@ -170,7 +170,7 @@ protected:
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virtual std::string to_func_call_arg(uint32_t id);
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virtual std::string to_function_name(uint32_t img, const SPIRType &imgtype, bool is_fetch, bool is_gather,
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bool is_proj, bool has_array_offsets, bool has_offset, bool has_grad,
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bool has_lod, bool has_dref);
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bool has_lod, bool has_dref, uint32_t lod);
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virtual std::string to_function_args(uint32_t img, const SPIRType &imgtype, bool is_fetch, bool is_gather,
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bool is_proj, uint32_t coord, uint32_t coord_components, uint32_t dref,
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uint32_t grad_x, uint32_t grad_y, uint32_t lod, uint32_t coffset,
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@ -384,7 +384,7 @@ protected:
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void replace_fragment_output(SPIRVariable &var);
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void replace_fragment_outputs();
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std::string legacy_tex_op(const std::string &op, const SPIRType &imgtype);
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std::string legacy_tex_op(const std::string &op, const SPIRType &imgtype, uint32_t lod);
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uint32_t indent = 0;
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@ -1091,9 +1091,6 @@ void CompilerHLSL::emit_texture_op(const Instruction &i)
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if (coffset || offset)
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texop += "Offset";
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if (is_legacy())
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texop = legacy_tex_op(texop, imgtype);
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expr += texop;
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expr += "(";
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expr += to_expression(img);
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@ -989,7 +989,7 @@ void CompilerMSL::emit_function_prototype(SPIRFunction &func, uint64_t)
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// Returns the texture sampling function string for the specified image and sampling characteristics.
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string CompilerMSL::to_function_name(uint32_t img, const SPIRType &, bool is_fetch, bool is_gather, bool, bool, bool,
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bool, bool, bool has_dref)
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bool, bool, bool has_dref, uint32_t)
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{
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// Texture reference
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string fname = to_expression(img) + ".";
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@ -140,7 +140,7 @@ protected:
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std::string to_name(uint32_t id, bool allow_alias = true) const override;
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std::string to_function_name(uint32_t img, const SPIRType &imgtype, bool is_fetch, bool is_gather, bool is_proj,
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bool has_array_offsets, bool has_offset, bool has_grad, bool has_lod,
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bool has_dref) override;
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bool has_dref, uint32_t lod) override;
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std::string to_function_args(uint32_t img, const SPIRType &imgtype, bool is_fetch, bool is_gather, bool is_proj,
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uint32_t coord, uint32_t coord_components, uint32_t dref, uint32_t grad_x,
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uint32_t grad_y, uint32_t lod, uint32_t coffset, uint32_t offset, uint32_t bias,
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