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#pragma once
#include <mbgl/gfx/program.hpp>
#include <mbgl/gl/types.hpp>
#include <mbgl/gl/object.hpp>
#include <mbgl/gl/context.hpp>
#include <mbgl/gl/draw_scope_resource.hpp>
#include <mbgl/gfx/vertex_buffer.hpp>
#include <mbgl/gfx/index_buffer.hpp>
#include <mbgl/gfx/uniform.hpp>
#include <mbgl/gl/vertex_array.hpp>
#include <mbgl/gl/attribute.hpp>
#include <mbgl/gl/uniform.hpp>
#include <mbgl/gl/texture.hpp>
#include <mbgl/util/io.hpp>
#include <mbgl/util/logging.hpp>
#include <mbgl/programs/program_parameters.hpp>
#include <mbgl/programs/gl/shader_source.hpp>
#include <mbgl/programs/gl/shaders.hpp>
#include <string>
namespace mbgl {
namespace gl {
template <class Name>
class Program final : public gfx::Program<Name> {
public:
using AttributeList = typename Name::AttributeList;
using UniformList = typename Name::UniformList;
using TextureList = typename Name::TextureList;
Program(ProgramParameters programParameters_)
: programParameters(std::move(programParameters_)) {
}
const ProgramParameters programParameters;
static constexpr const auto vertexOffset = programs::gl::ShaderSource<Name>::vertexOffset;
static constexpr const auto fragmentOffset = programs::gl::ShaderSource<Name>::fragmentOffset;
class Instance {
public:
Instance(Context& context,
const std::initializer_list<const char*>& vertexSource,
const std::initializer_list<const char*>& fragmentSource)
: program(context.createProgram(
context.createShader(ShaderType::Vertex, vertexSource),
context.createShader(ShaderType::Fragment, fragmentSource),
attributeLocations.getFirstAttribName())) {
attributeLocations.queryLocations(program);
uniformStates.queryLocations(program);
// Texture units are specified via uniforms as well, so we need query their locations
textureStates.queryLocations(program);
}
static std::unique_ptr<Instance>
createInstance(gl::Context& context,
const ProgramParameters& programParameters,
const std::string& additionalDefines) {
// Compile the shader
const std::initializer_list<const char*> vertexSource = {
programParameters.getDefines().c_str(),
additionalDefines.c_str(),
(programs::gl::shaderSource() + programs::gl::vertexPreludeOffset),
(programs::gl::shaderSource() + vertexOffset)
};
const std::initializer_list<const char*> fragmentSource = {
programParameters.getDefines().c_str(),
additionalDefines.c_str(),
(programs::gl::shaderSource() + programs::gl::fragmentPreludeOffset),
(programs::gl::shaderSource() + fragmentOffset)
};
auto result = std::make_unique<Instance>(context, vertexSource, fragmentSource);
return std::move(result);
}
UniqueProgram program;
gl::AttributeLocations<AttributeList> attributeLocations;
gl::UniformStates<UniformList> uniformStates;
gl::TextureStates<TextureList> textureStates;
};
void draw(gfx::Context& genericContext,
gfx::RenderPass&,
const gfx::DrawMode& drawMode,
const gfx::DepthMode& depthMode,
const gfx::StencilMode& stencilMode,
const gfx::ColorMode& colorMode,
const gfx::CullFaceMode& cullFaceMode,
const gfx::UniformValues<UniformList>& uniformValues,
gfx::DrawScope& drawScope,
const gfx::AttributeBindings<AttributeList>& attributeBindings,
const gfx::TextureBindings<TextureList>& textureBindings,
const gfx::IndexBuffer& indexBuffer,
std::size_t indexOffset,
std::size_t indexLength) override {
auto& context = static_cast<gl::Context&>(genericContext);
context.setDepthMode(depthMode);
context.setStencilMode(stencilMode);
context.setColorMode(colorMode);
context.setCullFaceMode(cullFaceMode);
const uint32_t key = gl::AttributeKey<AttributeList>::compute(attributeBindings);
auto it = instances.find(key);
if (it == instances.end()) {
it = instances
.emplace(key,
Instance::createInstance(
context,
programParameters,
gl::AttributeKey<AttributeList>::defines(attributeBindings)))
.first;
}
auto& instance = *it->second;
context.program = instance.program;
instance.uniformStates.bind(uniformValues);
instance.textureStates.bind(context, textureBindings);
auto& vertexArray = drawScope.getResource<gl::DrawScopeResource>().vertexArray;
vertexArray.bind(context,
indexBuffer,
instance.attributeLocations.toBindingArray(attributeBindings));
context.draw(drawMode,
indexOffset,
indexLength);
}
private:
std::map<uint32_t, std::unique_ptr<Instance>> instances;
};
} // namespace gl
} // namespace mbgl
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