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#pragma once
#include <mbgl/gfx/vertex_vector.hpp>
#include <mbgl/gfx/vertex_buffer.hpp>
#include <mbgl/gfx/index_vector.hpp>
#include <mbgl/gfx/index_buffer.hpp>
#include <mbgl/gfx/texture.hpp>
#include <mbgl/gfx/draw_scope.hpp>
#include <mbgl/gfx/program.hpp>
#include <mbgl/gfx/types.hpp>
namespace mbgl {
class ProgramParameters;
namespace gfx {
class Context {
protected:
Context(ContextType type_, uint32_t maximumVertexBindingCount_)
: backend(type_), maximumVertexBindingCount(maximumVertexBindingCount_) {
}
public:
const ContextType backend;
static constexpr const uint32_t minimumRequiredVertexBindingCount = 8;
const uint32_t maximumVertexBindingCount;
public:
Context(Context&&) = delete;
Context(const Context&) = delete;
Context& operator=(Context&& other) = delete;
Context& operator=(const Context& other) = delete;
virtual ~Context() = default;
public:
// Called at the end of a frame.
virtual void performCleanup() = 0;
public:
template <class Vertex>
VertexBuffer<Vertex>
createVertexBuffer(VertexVector<Vertex>&& v,
const BufferUsageType usage = BufferUsageType::StaticDraw) {
return { v.elements(), createVertexBufferResource(v.data(), v.bytes(), usage) };
}
template <class Vertex>
void updateVertexBuffer(VertexBuffer<Vertex>& buffer, VertexVector<Vertex>&& v) {
assert(v.elements() == buffer.elements);
updateVertexBufferResource(*buffer.resource, v.data(), v.bytes());
}
template <class DrawMode>
IndexBuffer createIndexBuffer(IndexVector<DrawMode>&& v,
const BufferUsageType usage = BufferUsageType::StaticDraw) {
return { v.elements(), createIndexBufferResource(v.data(), v.bytes(), usage) };
}
template <class DrawMode>
void updateIndexBuffer(IndexBuffer& buffer, IndexVector<DrawMode>&& v) {
assert(v.elements() == buffer.elements);
updateIndexBufferResource(*buffer.resource, v.data(), v.bytes());
}
protected:
virtual std::unique_ptr<const VertexBufferResource>
createVertexBufferResource(const void* data, std::size_t size, const BufferUsageType) = 0;
virtual void
updateVertexBufferResource(const VertexBufferResource&, const void* data, std::size_t size) = 0;
virtual std::unique_ptr<const IndexBufferResource>
createIndexBufferResource(const void* data, std::size_t size, const BufferUsageType) = 0;
virtual void
updateIndexBufferResource(const IndexBufferResource&, const void* data, std::size_t size) = 0;
public:
// Create a texture from an image with data.
template <typename Image>
Texture createTexture(const Image& image,
TextureChannelDataType type = TextureChannelDataType::UnsignedByte) {
auto format = image.channels == 4 ? TexturePixelType::RGBA : TexturePixelType::Alpha;
return { image.size,
createTextureResource(image.size, image.data.get(), format, type) };
}
// Creates an empty texture with the specified dimensions.
Texture createTexture(const Size size,
TexturePixelType format = TexturePixelType::RGBA,
TextureChannelDataType type = TextureChannelDataType::UnsignedByte) {
return { size, createTextureResource(size, nullptr, format, type) };
}
template <typename Image>
void updateTexture(Texture& texture,
const Image& image,
TextureChannelDataType type = TextureChannelDataType::UnsignedByte) {
auto format = image.channels == 4 ? TexturePixelType::RGBA : TexturePixelType::Alpha;
updateTextureResource(*texture.resource, image.size, image.data.get(), format, type);
texture.size = image.size;
}
template <typename Image>
void updateTextureSub(Texture& texture,
const Image& image,
const uint16_t offsetX,
const uint16_t offsetY,
TextureChannelDataType type = TextureChannelDataType::UnsignedByte) {
assert(image.size.width + offsetX <= texture.size.width);
assert(image.size.height + offsetY <= texture.size.height);
auto format = image.channels == 4 ? TexturePixelType::RGBA : TexturePixelType::Alpha;
updateTextureResourceSub(*texture.resource, offsetX, offsetY, image.size, image.data.get(), format, type);
}
protected:
virtual std::unique_ptr<TextureResource> createTextureResource(
Size, const void* data, TexturePixelType, TextureChannelDataType) = 0;
virtual void updateTextureResource(const TextureResource&, Size, const void* data,
TexturePixelType, TextureChannelDataType) = 0;
virtual void updateTextureResourceSub(const TextureResource&, uint16_t xOffset, uint16_t yOffset, Size, const void* data,
TexturePixelType, TextureChannelDataType) = 0;
public:
DrawScope createDrawScope() {
return { createDrawScopeResource() };
}
protected:
virtual std::unique_ptr<DrawScopeResource> createDrawScopeResource() = 0;
public:
template <typename Name>
std::unique_ptr<Program<Name>> createProgram(const ProgramParameters&);
private:
template <typename Backend, typename Name>
std::unique_ptr<Program<Name>> createProgram(const ProgramParameters&);
};
} // namespace gfx
} // namespace mbgl
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