59 lines
2.5 KiB
C
59 lines
2.5 KiB
C
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#pragma once
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#include <cgv/render/context.h>
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#include <cgv/render/element_traits.h>
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#include "lib_begin.h"
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namespace cgv {
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namespace render {
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/** a vertex buffer is an unstructured memory block on the GPU. */
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class CGV_API vertex_buffer : public vertex_buffer_base
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{
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size_t size_in_bytes;
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public:
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/// construct from description of component format, where the default format specifies a color buffer with alpha channel
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vertex_buffer(VertexBufferType _type = VBT_VERTICES, VertexBufferUsage _usage = VBU_STATIC_DRAW);
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/// calls the destruct method if necessary
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~vertex_buffer();
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/// create empty vertex buffer of size \c size given in bytes
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bool create(context& ctx, size_t size_in_bytes);
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/// create vertex buffer and copy data from CPU array \c array into buffer memory
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template <typename T>
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bool create(context& ctx, const T& array) {
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size_in_bytes = array_descriptor_traits < T>::get_size(array);
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return ctx.vertex_buffer_create(*this, array_descriptor_traits < T>::get_address(array), size_in_bytes);
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}
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/// create vertex buffer and copy data from CPU array \c array_ptr into buffer memory
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template <typename T>
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bool create(context& ctx, const T* array_ptr, size_t nr_elements) {
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size_in_bytes = nr_elements * sizeof(T);
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return ctx.vertex_buffer_create(*this, array_ptr, size_in_bytes);
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}
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/// check whether the vertex buffer has been created
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bool is_created() const;
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/// return size in bytes
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size_t get_size_in_bytes() const;
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/// replace part (starting at byte offset \c buffer_offset_in_bytes) or whole vertex buffer content from \c nr_elements of CPU array \c array_ptr
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template <typename T>
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bool replace(context& ctx, size_t buffer_offset_in_bytes, const T* array_ptr, unsigned nr_elements) {
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return ctx.vertex_buffer_replace(*this, buffer_offset_in_bytes, nr_elements* sizeof(T), array_ptr);
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}
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/// copy \c size_in_bytes number bytes from this vertex buffer starting at byte offset \c start_offset_in_bytes to vertex buffer \c dst starting at offest \c dst_offset_in_bytes
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bool copy(context& ctx, size_t src_offset_in_bytes, size_t size_in_bytes, vertex_buffer& dst, size_t dst_offset_in_bytes) const;
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/// copy \c nr_elements array elements from vertex buffer starting at byte offset \c start_offset_in_bytes to CPU array \c array_ptr
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template <typename T>
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bool copy(context& ctx, size_t src_offset_in_bytes, T* array_ptr, size_t nr_elements) {
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return ctx.vertex_buffer_copy_back(*this, src_offset_in_bytes, sizeof(T)*nr_elements, array_ptr);
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}
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/// destruct the render buffer
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void destruct(context& ctx);
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};
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}
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}
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#include <cgv/config/lib_end.h>
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