Clean more legacy code (#3478)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/mbgl/shaders/program_parameters.cpp

@@ -0,0 +1,82 @@
+#include <mbgl/shaders/program_parameters.hpp>
+
+#include <mbgl/util/hash.hpp>
+#include <mbgl/util/string.hpp>
+
+#include <string_view>
+#include <stdexcept>
+
+namespace mbgl {
+
+ProgramParameters::ProgramParameters(const float pixelRatio, const bool overdraw)
+    : defines(2),
+      overdrawInspector(overdraw) {
+    defines["DEVICE_PIXEL_RATIO"] = util::toString(pixelRatio, true);
+    if (overdraw) {
+        defines["OVERDRAW_INSPECTOR"] = std::string();
+    }
+    definesHash = util::hash(getDefinesString());
+}
+
+ProgramParameters ProgramParameters::withShaderSource(const ProgramSource& source) const noexcept {
+    assert(gfx::Backend::Type::TYPE_MAX != source.backend);
+
+    ProgramParameters params = *this;
+    params.userSources[static_cast<size_t>(source.backend)] = source;
+    return params;
+}
+
+ProgramParameters ProgramParameters::withDefaultSource(const ProgramSource& source) const noexcept {
+    assert(gfx::Backend::Type::TYPE_MAX != source.backend);
+
+    ProgramParameters params = *this;
+    params.defaultSources[static_cast<size_t>(source.backend)] = source;
+    return params;
+}
+
+ProgramParameters ProgramParameters::withProgramType(shaders::BuiltIn type) const noexcept {
+    ProgramParameters params = *this;
+    params.programType = type;
+    return params;
+}
+
+const std::string& ProgramParameters::getDefinesString() const {
+    if (definesStr.empty() && !defines.empty()) {
+        definesStr.assign(defines.size() * 32, '\0');
+        definesStr.clear();
+        for (const auto& pair : defines) {
+            definesStr.append("#define ").append(pair.first);
+            if (!pair.second.empty()) {
+                definesStr.append(" ").append(pair.second);
+            }
+            definesStr.append("\n");
+        }
+    }
+    return definesStr;
+}
+
+const std::string& ProgramParameters::vertexSource(gfx::Backend::Type backend) const {
+    assert(gfx::Backend::Type::TYPE_MAX != backend);
+
+    if (userSources[static_cast<size_t>(backend)].vertex.length() > 0) {
+        return userSources[static_cast<size_t>(backend)].vertex;
+    } else if (defaultSources[static_cast<size_t>(backend)].vertex.length() > 0) {
+        return defaultSources[static_cast<size_t>(backend)].vertex;
+    } else {
+        throw std::runtime_error("No vertex shader source provided for selected backend!");
+    }
+}
+
+const std::string& ProgramParameters::fragmentSource(gfx::Backend::Type backend) const {
+    assert(gfx::Backend::Type::TYPE_MAX != backend);
+
+    if (userSources[static_cast<size_t>(backend)].fragment.length() > 0) {
+        return userSources[static_cast<size_t>(backend)].fragment;
+    } else if (defaultSources[static_cast<size_t>(backend)].fragment.length() > 0) {
+        return defaultSources[static_cast<size_t>(backend)].fragment;
+    } else {
+        throw std::runtime_error("No fragment shader source provided for selected backend!");
+    }
+}
+
+} // namespace mbgl