82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/**
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* Copyright (c) 2021 Dominic Masters
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*
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* This software is released under the MIT License.
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* https://opensource.org/licenses/MIT
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*/
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#pragma once
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#include "../libs.h"
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#define PRIMITIVE_POSITIONS_PER_VERTICE 3
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#define PRIMITIVE_COORDINATES_PER_VERTICE 2
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/** Structure containing information about a primitive */
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typedef struct {
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/** How many vertices are in the primitive */
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int32_t verticeCount;
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/** How many indices are in the primitive */
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int32_t indiceCount;
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/** Pointer to the vertex buffer on the GPU */
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GLuint vertexBuffer;
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/** Pointer to the index buffer on the GPU */
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GLuint indexBuffer;
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} primitive_t;
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/** Structure containing vertice position information */
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typedef struct {
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/** Coordinates */
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float x, y, z;
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/** Texture UVs */
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float u, v;
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} vertice_t;
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/** Indice that references a specific vertice */
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typedef unsigned int indice_t;
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/**
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* Creates a new primitive.
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* @param primitive Primitive to initialize.
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* @param verticeCount How many vertices can the primitive hold.
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* @param indiceCount How many indices can the primitive hold.
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*/
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void primitiveInit(primitive_t *primitive,
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int32_t verticeCount, int32_t indiceCount
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);
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/**
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* Buffer Vertices to a primitive for use in rendering.
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* @param primitive The primitive to buffer vertices into.
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* @param position The position (index) to overwrite the vertices of.
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* @param count The count of vertices to buffer.
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* @param vertices Array of vertices to buffer into the primitive.
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*/
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void primitiveBufferVertices(primitive_t *primitive,
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int32_t position, int32_t count, vertice_t *vertices
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);
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/**
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* Buffer Indices to a primitive for use in rendering.
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* @param primitive The primitive to buffer indices into.
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* @param position The position (index) to overwrite the indices of.
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* @param count The count of indices to buffer.
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* @param indices Array of indices to buffer into the primitive.
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*/
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void primitiveBufferIndices(primitive_t *primitive,
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int32_t position, int32_t count, indice_t *indices
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);
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/**
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* Draw a primitive. Primitives are drawn by their indices.
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* @param primitive Primitive to draw.
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* @param start Start indice (index) to draw.
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* @param count Count of indices to draw. Use -1 to draw all.
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*/
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void primitiveDraw(primitive_t *primitive, int32_t start, int32_t count);
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/**
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* Cleanup a previously initialized primitive.
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* @param primitive Primitive to cleanup.
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*/
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void primitiveDispose(primitive_t *primitive); |