Mike Erwin
76c99f361f
Fixed compile error in debug build (thanks mont29) Renamed some functions for consistency. New features: Create a Batch with immediate mode! Just use immBeginBatch instead of immBegin. You can keep the result and draw it as many times as you like. This partially replaces the need for display lists. Copy a VertexFormat, and create a VertexBuffer using an existing format. Resize a VertexBuffer to a different number of vertices. (can only resize BEFORE using it to draw)
87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
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// Gawain geometry batch
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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 "vertex_buffer.h"
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#include "element.h"
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typedef enum {
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READY_TO_FORMAT,
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READY_TO_BUILD,
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BUILDING,
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READY_TO_DRAW
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} BatchPhase;
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typedef struct {
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// geometry
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VertexBuffer* verts;
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ElementList* elem; // NULL if element list not needed
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GLenum prim_type;
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// book-keeping
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GLuint vao_id; // remembers all geometry state (vertex attrib bindings & element buffer)
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BatchPhase phase;
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bool program_dirty;
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// state
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GLuint program;
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} Batch;
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Batch* Batch_create(GLenum prim_type, VertexBuffer*, ElementList*);
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// TODO: void Batch_discard(Batch*);
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// must first decide how sharing of vertex buffers & index buffers should work
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void Batch_set_program(Batch*, GLuint program);
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// Entire batch draws with one shader program, but can be redrawn later with another program.
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// Vertex shader's inputs must be compatible with the batch's vertex format.
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void Batch_draw(Batch*);
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#if 0 // future plans
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// Can multiple batches share a VertexBuffer? Use ref count?
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// We often need a batch with its own data, to be created and discarded together.
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// WithOwn variants reduce number of system allocations.
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typedef struct {
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Batch batch;
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VertexBuffer verts; // link batch.verts to this
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} BatchWithOwnVertexBuffer;
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typedef struct {
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Batch batch;
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ElementList elem; // link batch.elem to this
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} BatchWithOwnElementList;
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typedef struct {
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Batch batch;
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ElementList elem; // link batch.elem to this
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VertexBuffer verts; // link batch.verts to this
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} BatchWithOwnVertexBufferAndElementList;
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Batch* create_BatchWithOwnVertexBuffer(GLenum prim_type, VertexFormat*, unsigned v_ct, ElementList*);
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Batch* create_BatchWithOwnElementList(GLenum prim_type, VertexBuffer*, unsigned prim_ct);
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Batch* create_BatchWithOwnVertexBufferAndElementList(GLenum prim_type, VertexFormat*, unsigned v_ct, unsigned prim_ct);
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// verts: shared, own
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// elem: none, shared, own
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Batch* create_BatchInGeneral(GLenum prim_type, VertexBufferStuff, ElementListStuff);
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#endif // future plans
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