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#pragma once
#include <mbgl/gl/types.hpp>
#include <mbgl/gl/object.hpp>
#include <mbgl/gl/context.hpp>
#include <mbgl/gl/vertex_buffer.hpp>
#include <mbgl/gl/index_buffer.hpp>
#include <mbgl/gl/vertex_array.hpp>
#include <mbgl/gl/attribute.hpp>
#include <mbgl/gl/uniform.hpp>
#include <mbgl/util/io.hpp>
#include <mbgl/util/logging.hpp>
#include <mbgl/programs/binary_program.hpp>
#include <mbgl/programs/program_parameters.hpp>
#include <mbgl/shaders/shaders.hpp>
#include <string>
namespace mbgl {
namespace gl {
template <class P, class As, class Us>
class Program {
public:
using Primitive = P;
using Attributes = As;
using Uniforms = Us;
using UniformValues = typename Uniforms::Values;
using AttributeBindings = typename Attributes::Bindings;
Program(Context& context, const std::string& vertexSource, const std::string& fragmentSource)
: program(
context.createProgram(context.createShader(ShaderType::Vertex, vertexSource),
context.createShader(ShaderType::Fragment, fragmentSource))),
uniformsState((context.linkProgram(program), Uniforms::bindLocations(program))),
attributeLocations(Attributes::bindLocations(program)) {
// Re-link program after manually binding only active attributes in Attributes::bindLocations
context.linkProgram(program);
// We have to re-initialize the uniforms state from the bindings as the uniform locations
// get shifted on some implementations
uniformsState = Uniforms::bindLocations(program);
}
template <class BinaryProgram>
Program(Context& context, const BinaryProgram& binaryProgram)
: program(context.createProgram(binaryProgram.format(), binaryProgram.code())),
uniformsState(Uniforms::loadNamedLocations(binaryProgram)),
attributeLocations(Attributes::loadNamedLocations(binaryProgram)) {
}
static Program createProgram(gl::Context& context,
const ProgramParameters& programParameters,
const char* name,
const char* vertexSource_,
const char* fragmentSource_) {
const std::string vertexSource = shaders::vertexSource(programParameters, vertexSource_);
const std::string fragmentSource = shaders::fragmentSource(programParameters, fragmentSource_);
#if MBGL_HAS_BINARY_PROGRAMS
optional<std::string> cachePath = programParameters.cachePath(name);
if (cachePath && context.supportsProgramBinaries()) {
const std::string identifier = shaders::programIdentifier(vertexSource, fragmentSource);
try {
if (auto cachedBinaryProgram = util::readFile(*cachePath)) {
const BinaryProgram binaryProgram(std::move(*cachedBinaryProgram));
if (binaryProgram.identifier() == identifier) {
return Program { context, binaryProgram };
} else {
Log::Warning(Event::OpenGL,
"Cached program %s changed. Recompilation required.",
name);
}
}
} catch (std::runtime_error& error) {
Log::Warning(Event::OpenGL, "Could not load cached program: %s",
error.what());
}
// Compile the shader
Program result{ context, vertexSource, fragmentSource };
try {
if (const auto binaryProgram =
result.template get<BinaryProgram>(context, identifier)) {
util::write_file(*cachePath, binaryProgram->serialize());
Log::Warning(Event::OpenGL, "Caching program in: %s", (*cachePath).c_str());
}
} catch (std::runtime_error& error) {
Log::Warning(Event::OpenGL, "Failed to cache program: %s", error.what());
}
return std::move(result);
}
#endif
(void)name;
return Program { context, vertexSource, fragmentSource };
}
template <class BinaryProgram>
optional<BinaryProgram> get(Context& context, const std::string& identifier) const {
if (auto binaryProgram = context.getBinaryProgram(program)) {
return BinaryProgram{ binaryProgram->first, std::move(binaryProgram->second),
identifier, Attributes::getNamedLocations(attributeLocations),
Uniforms::getNamedLocations(uniformsState) };
}
return {};
}
template <class DrawMode>
void draw(Context& context,
DrawMode drawMode,
DepthMode depthMode,
StencilMode stencilMode,
ColorMode colorMode,
const UniformValues& uniformValues,
VertexArray& vertexArray,
const AttributeBindings& attributeBindings,
const IndexBuffer<DrawMode>& indexBuffer,
std::size_t indexOffset,
std::size_t indexLength) {
static_assert(std::is_same<Primitive, typename DrawMode::Primitive>::value, "incompatible draw mode");
context.setDrawMode(drawMode);
context.setDepthMode(depthMode);
context.setStencilMode(stencilMode);
context.setColorMode(colorMode);
context.program = program;
Uniforms::bind(uniformsState, uniformValues);
vertexArray.bind(context,
indexBuffer.buffer,
Attributes::toBindingArray(attributeLocations, attributeBindings));
context.draw(drawMode.primitiveType,
indexOffset,
indexLength);
}
private:
UniqueProgram program;
typename Uniforms::State uniformsState;
typename Attributes::Locations attributeLocations;
};
} // namespace gl
} // namespace mbgl
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