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- /*
- * Copyright 2018 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "src/sksl/SkSLCPPUniformCTypes.h"
- #include "src/sksl/SkSLHCodeGenerator.h"
- #include "src/sksl/SkSLStringStream.h"
- #include <vector>
- namespace SkSL {
- /////////////////////////
- // Template evaluation //
- /////////////////////////
- static String eval_template(const String& format, const std::vector<String>& tokens,
- const std::vector<const String*>& values) {
- StringStream stream;
- int tokenNameStart = -1;
- for (size_t i = 0; i < format.size(); i++) {
- if (tokenNameStart >= 0) {
- // Within a token name so check if it is the end
- if (format[i] == '}') {
- // Skip 2 extra characters at the beginning for the $ and {, which must exist since
- // otherwise tokenNameStart < 0
- String token(format.c_str() + tokenNameStart + 2, i - tokenNameStart - 2);
- // Search for the token in supported list
- bool found = false;
- for (size_t j = 0; j < tokens.size(); j++) {
- if (token == tokens[j]) {
- // Found a match so append the value corresponding to j to the output
- stream.writeText(values[j]->c_str());
- found = true;
- break;
- }
- }
- if (!found) {
- // Write out original characters as if we didn't consider it to be a token name
- stream.writeText("${");
- stream.writeText(token.c_str());
- stream.writeText("}");
- }
- // And end the token name state
- tokenNameStart = -1;
- }
- } else {
- // Outside of a token name, so check if this character starts a name:
- // i == $ and i+1 == {
- if (i < format.size() - 1 && format[i] == '$' && format[i + 1] == '{') {
- // Begin parsing the token
- tokenNameStart = i;
- } else {
- // Just a character so append it
- stream.write8(format[i]);
- }
- }
- }
- return stream.str();
- }
- static bool determine_inline_from_template(const String& uniformTemplate) {
- // True if there is at most one instance of the ${var} template matcher in fUniformTemplate.
- int firstMatch = uniformTemplate.find("${var}");
- if (firstMatch < 0) {
- // Template doesn't use the value variable at all, so it can "inlined"
- return true;
- }
- // Check for another occurrence of ${var}, after firstMatch + 6
- int secondMatch = uniformTemplate.find("${var}", firstMatch + strlen("${var}"));
- // If there's no second match, then the value can be inlined in the c++ code
- return secondMatch < 0;
- }
- ///////////////////////////////////////
- // UniformCTypeMapper implementation //
- ///////////////////////////////////////
- String UniformCTypeMapper::dirtyExpression(const String& newVar, const String& oldVar) const {
- if (fSupportsTracking) {
- std::vector<String> tokens = { "newVar", "oldVar" };
- std::vector<const String*> values = { &newVar, &oldVar };
- return eval_template(fDirtyExpressionTemplate, tokens, values);
- } else {
- return "";
- }
- }
- String UniformCTypeMapper::saveState(const String& newVar, const String& oldVar) const {
- if (fSupportsTracking) {
- std::vector<String> tokens = { "newVar", "oldVar" };
- std::vector<const String*> values = { &newVar, &oldVar };
- return eval_template(fSaveStateTemplate, tokens, values);
- } else {
- return "";
- }
- }
- String UniformCTypeMapper::setUniform(const String& pdman, const String& uniform,
- const String& var) const {
- std::vector<String> tokens = { "pdman", "uniform", "var" };
- std::vector<const String*> values = { &pdman, &uniform, &var };
- return eval_template(fUniformTemplate, tokens, values);
- }
- UniformCTypeMapper::UniformCTypeMapper(
- Layout::CType ctype, const std::vector<String>& skslTypes, const String& setUniformFormat,
- bool enableTracking, const String& defaultValue, const String& dirtyExpressionFormat,
- const String& saveStateFormat)
- : fCType(ctype)
- , fSKSLTypes(skslTypes)
- , fUniformTemplate(setUniformFormat)
- , fInlineValue(determine_inline_from_template(setUniformFormat))
- , fSupportsTracking(enableTracking)
- , fDefaultValue(defaultValue)
- , fDirtyExpressionTemplate(dirtyExpressionFormat)
- , fSaveStateTemplate(saveStateFormat) { }
- // NOTE: These would be macros, but C++ initialization lists for the sksl type names do not play
- // well with macro parsing.
- static UniformCTypeMapper REGISTER(Layout::CType ctype, const std::vector<String>& skslTypes,
- const char* uniformFormat, const char* defaultValue,
- const char* dirtyExpression) {
- return UniformCTypeMapper(ctype, skslTypes, uniformFormat, defaultValue, dirtyExpression,
- "${oldVar} = ${newVar}");
- }
- static UniformCTypeMapper REGISTER(Layout::CType ctype, const std::vector<String>& skslTypes,
- const char* uniformFormat, const char* defaultValue) {
- return REGISTER(ctype, skslTypes, uniformFormat, defaultValue,
- "${oldVar} != ${newVar}");
- }
- //////////////////////////////
- // Currently defined ctypes //
- //////////////////////////////
- static const std::vector<UniformCTypeMapper>& get_mappers() {
- static const std::vector<UniformCTypeMapper> registeredMappers = {
- REGISTER(Layout::CType::kSkRect, { "half4", "float4", "double4" },
- "${pdman}.set4fv(${uniform}, 1, reinterpret_cast<const float*>(&${var}))", // to gpu
- "SkRect::MakeEmpty()", // default value
- "${oldVar}.isEmpty() || ${oldVar} != ${newVar}"), // dirty check
- REGISTER(Layout::CType::kSkIRect, { "int4", "short4", "byte4" },
- "${pdman}.set4iv(${uniform}, 1, reinterpret_cast<const int*>(&${var}))", // to gpu
- "SkIRect::MakeEmpty()", // default value
- "${oldVar}.isEmpty() || ${oldVar} != ${newVar}"), // dirty check
- REGISTER(Layout::CType::kSkPMColor4f, { "half4", "float4", "double4" },
- "${pdman}.set4fv(${uniform}, 1, ${var}.vec())", // to gpu
- "{SK_FloatNaN, SK_FloatNaN, SK_FloatNaN, SK_FloatNaN}"), // default value
- REGISTER(Layout::CType::kSkVector4, { "half4", "float4", "double4" },
- "${pdman}.set4fv(${uniform}, 1, ${var}.fData)", // to gpu
- "SkVector4(SK_MScalarNaN, SK_MScalarNaN, SK_MScalarNaN, SK_MScalarNaN)", // default value
- "${oldVar} != (${newVar})"), // dirty check
- REGISTER(Layout::CType::kSkPoint, { "half2", "float2", "double2" } ,
- "${pdman}.set2f(${uniform}, ${var}.fX, ${var}.fY)", // to gpu
- "SkPoint::Make(SK_FloatNaN, SK_FloatNaN)"), // default value
- REGISTER(Layout::CType::kSkIPoint, { "int2", "short2", "byte2" },
- "${pdman}.set2i(${uniform}, ${var}.fX, ${var}.fY)", // to gpu
- "SkIPoint::Make(SK_NaN32, SK_NaN32)"), // default value
- REGISTER(Layout::CType::kSkMatrix, { "half3x3", "float3x3", "double3x3" },
- "${pdman}.setSkMatrix(${uniform}, ${var})", // to gpu
- "SkMatrix::MakeScale(SK_FloatNaN)", // default value
- "!${oldVar}.cheapEqualTo(${newVar})"), // dirty check
- REGISTER(Layout::CType::kSkMatrix44, { "half4x4", "float4x4", "double4x4" },
- "${pdman}.setSkMatrix44(${uniform}, ${var})", // to gpu
- "SkMatrix44(SkMatrix44::kNaN_Constructor)", // default value
- "${oldVar} != (${newVar})"), // dirty check
- REGISTER(Layout::CType::kFloat, { "half", "float", "double" },
- "${pdman}.set1f(${uniform}, ${var})", // to gpu
- "SK_FloatNaN"), // default value
- REGISTER(Layout::CType::kInt32, { "int", "short", "byte" },
- "${pdman}.set1i(${uniform}, ${var})", // to gpu
- "SK_NaN32"), // default value
- };
- return registeredMappers;
- }
- /////
- // Greedy search through registered handlers for one that has a matching
- // ctype and supports the sksl type of the variable.
- const UniformCTypeMapper* UniformCTypeMapper::Get(const Context& context, const Type& type,
- const Layout& layout) {
- const std::vector<UniformCTypeMapper>& registeredMappers = get_mappers();
- Layout::CType ctype = layout.fCType;
- // If there's no custom ctype declared in the layout, use the default type mapping
- if (ctype == Layout::CType::kDefault) {
- ctype = HCodeGenerator::ParameterCType(context, type, layout);
- }
- const String& skslType = type.name();
- for (size_t i = 0; i < registeredMappers.size(); i++) {
- if (registeredMappers[i].ctype() == ctype) {
- // Check for sksl support, since some c types (e.g. SkMatrix) can be used in multiple
- // uniform types and send data to the gpu differently in those conditions
- const std::vector<String> supportedSKSL = registeredMappers[i].supportedTypeNames();
- for (size_t j = 0; j < supportedSKSL.size(); j++) {
- if (supportedSKSL[j] == skslType) {
- // Found a match, so return it or an explicitly untracked version if tracking is
- // disabled in the layout
- return ®isteredMappers[i];
- }
- }
- }
- }
- // Didn't find a match
- return nullptr;
- }
- } // namespace
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