68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
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// Gawain immediate mode work-alike, take 2
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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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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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#pragma once
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#include "GPU_glew.h"
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#include <stdbool.h>
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#define PER_THREAD
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// #define PER_THREAD __thread
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// MSVC uses __declspec(thread) for C code
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#define MAX_VERTEX_ATTRIBS 16
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#define TRUST_NO_ONE 1
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typedef enum {
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KEEP_FLOAT,
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KEEP_INT,
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NORMALIZE_INT_TO_FLOAT, // 127 (ubyte) -> 0.5 (and so on for other int types)
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CONVERT_INT_TO_FLOAT // 127 (any int type) -> 127.0
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} VertexFetchMode;
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typedef struct {
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GLenum comp_type;
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unsigned comp_ct; // 1 to 4
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unsigned sz; // size in bytes, 1 to 16
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unsigned offset; // from beginning of vertex, in bytes
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VertexFetchMode fetch_mode;
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char* name; // TODO: shared allocation of all names within a VertexFormat
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} Attrib;
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typedef struct {
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unsigned attrib_ct; // 0 to 16 (MAX_VERTEX_ATTRIBS)
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unsigned stride; // stride in bytes, 1 to 256
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bool packed;
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Attrib attribs[MAX_VERTEX_ATTRIBS]; // TODO: variable-size attribs array
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} VertexFormat;
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void clear_VertexFormat(VertexFormat*);
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unsigned add_attrib(VertexFormat*, const char* name, GLenum comp_type, unsigned comp_ct, VertexFetchMode);
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void pack(VertexFormat*);
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// unsigned attrib_idx(const VertexFormat*, const char* name);
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void bind_attrib_locations(const VertexFormat*, GLuint program);
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extern PER_THREAD VertexFormat immVertexFormat; // so we don't have to copy or pass around
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void immInit(void);
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void immDestroy(void);
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void immBegin(GLenum primitive, unsigned vertex_ct);
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void immEnd(void);
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void immAttrib1f(unsigned attrib_id, float x);
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void immAttrib3f(unsigned attrib_id, float x, float y, float z);
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void immEndVertex(void); // and move on to the next vertex
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