Mike Erwin
39f7a81176
Follow-up to rBddb1d5648dbd API is nearly complete but untested. 1) create batch with vertex buffer & optional index buffer 2) choose shader program 3) draw!
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
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// Gawain element list (AKA index buffer)
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//
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// This code is part of the Gawain library, with modifications
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// specific to integration with Blender.
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//
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// Copyright 2016 Mike Erwin
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//
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// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of
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// the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
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#pragma once
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#include "common.h"
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#define TRACK_INDEX_RANGE 1
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typedef struct {
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unsigned index_ct;
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#if TRACK_INDEX_RANGE
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GLenum index_type;
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unsigned min_index;
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unsigned max_index;
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unsigned base_index;
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#endif
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void* data; // NULL indicates data in VRAM (unmapped) or not yet allocated
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GLuint vbo_id; // 0 indicates not yet sent to VRAM
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} ElementList;
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void ElementList_use(ElementList*);
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unsigned ElementList_size(const ElementList*);
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typedef struct {
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unsigned max_allowed_index;
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unsigned max_index_ct;
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unsigned index_ct;
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GLenum prim_type;
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unsigned* data;
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} ElementListBuilder;
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// supported primitives:
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// GL_POINTS
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// GL_LINES
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// GL_TRIANGLES
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void ElementListBuilder_init(ElementListBuilder*, GLenum prim_type, unsigned prim_ct, unsigned vertex_ct);
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//void ElementListBuilder_init_custom(ElementListBuilder*, GLenum prim_type, unsigned index_ct, unsigned vertex_ct);
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void add_generic_vertex(ElementListBuilder*, unsigned v);
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void add_point_vertex(ElementListBuilder*, unsigned v);
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void add_line_vertices(ElementListBuilder*, unsigned v1, unsigned v2);
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void add_triangle_vertices(ElementListBuilder*, unsigned v1, unsigned v2, unsigned v3);
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void ElementList_build(ElementListBuilder*, ElementList*);
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