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/*
Software rendering library.
Coordinate systems:
- The coordinate systems for image addressing and texture sampling are the same
except in scale.
Origin is in the top-left corner of the image.
Axes extend down and to the right.
- Image addressing:
(i,j) integer coordinates refer to the center of the pixel.
- Texture addressing:
(u,v) range in [0,1].
(0,0) is the center of the top-left pixel.
(1,1) is the center of the bottom-right pixel.
Multi-threading:
- Internal resources (swgfx context) are externally synchronized.
- External resources (colour buffer) are internally synchronized.
*/
#pragma once
#include <stddef.h>
#include <stdint.h>
typedef float R;
typedef struct sgVec2i { int x, y; } sgVec2i;
typedef struct sgVec2 { R x, y; } sgVec2;
typedef struct sgVec3 { R x, y, z; } sgVec3;
typedef struct sgVec4 { R x, y, z, w; } sgVec4;
typedef sgVec3 sgNormal;
typedef struct sgVert2i { sgVec2i pos; sgVec2 uv; } sgVert2i;
typedef struct sgVert2 { sgVec2 pos; sgVec2 uv; } sgVert2;
typedef struct sgVert3 { sgVec3 pos; sgVec2 uv; } sgVert3;
typedef struct sgQuadi { sgVert2i p0, p1; } sgQuadi;
typedef struct sgQuad { sgVert2 p0, p1; } sgQuad;
typedef struct sgTri2 { sgVert2 p0, p1, p2; } sgTri2;
typedef struct sgTri3 { sgVert3 p0, p1, p2; } sgTri3;
typedef uint16_t sgIdx;
typedef struct sgVertIdx { sgIdx pos, uv, normal; } sgVertIdx;
typedef struct sgTriIdx { sgVertIdx v0, v1, v2; } sgTriIdx;
typedef struct sgBgra { uint8_t b, g, r, a; } sgBgra;
typedef struct sgRgba { uint8_t r, g, b, a; } sgRgba;
// TODO: Should we use real-valued colours?
typedef sgRgba sgPixel;
// TODO: Expose a macro to control the desired surface format.
typedef sgBgra sgScreenPixel;
typedef struct sgImage {
int width;
int height;
sgPixel* pixels;
} sgImage;
typedef struct swgfx swgfx;
size_t sgMem(int width, int height); // Get memory requirements.
swgfx* sgNew(int width, int height, void* mem);
void sgDel(swgfx**);
// TODO: Write client app first, then implement the functions below in the C file.
void sgPresent(swgfx*, sgVec2i dimensions, sgScreenPixel* screen);
void sgModelId (swgfx*);
void sgModel (swgfx*, sgVec3 position, sgVec3 right, sgVec3 up, sgVec3 forward);
void sgView (swgfx*, sgVec3 position, sgVec3 forward);
void sgOrtho (swgfx*, R left, R right, R top, R bottom, R near, R far);
void sgPerspective(swgfx*, R fovy, R aspect, R near, R far);
void sgViewport (swgfx*, int x0, int y0, int width, int height);
void sgTexture(swgfx*, const sgImage*);
void sgClear(swgfx*);
void sgPixels(swgfx*, size_t count, const sgVec2i* positions, sgPixel colour);
void sgQuads (swgfx*, size_t count, const sgQuad*);
void sgQuadsi(swgfx*, size_t count, const sgQuadi*);
void sgTriangles2 (swgfx*, size_t count, const sgTri2*);
void sgTriangleStrip2(swgfx*, size_t count, const sgVec2*);
void sgTriangles (swgfx*, size_t count, const sgTri3*, const sgNormal*);
void sgTriangleStrip (swgfx*, size_t count, const sgVec3*, const sgNormal*);
void sgTrianglesIndexed(swgfx*, size_t numIndices, const sgIdx* indices, const sgVec3* positions, const sgVec2* texcoords);
void sgTrianglesIndexedNonUniform(swgfx*, size_t numTris, const sgTriIdx* tris, const sgVec3* positions, const sgVec2* texcoords);
void sgCheck(swgfx*);
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