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Make vector types public and remove unnecessary Vertex and TexCoord

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Abdelrahman Said 2024-08-11 19:28:17 +01:00
parent 3a852cbab0
commit 91c4721c46
2 changed files with 84 additions and 88 deletions
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90
src/obj.c
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@ -47,7 +47,6 @@
MAT.row3.w * V.w, \ MAT.row3.w * V.w, \
}) })
#define project_vec4(V) ((V3f){.x = V.x / V.w, .y = V.y / V.w, .z = V.z / V.w}) #define project_vec4(V) ((V3f){.x = V.x / V.w, .y = V.y / V.w, .z = V.z / V.w})
#define vec3_to_vertex(V) ((Vertex){.x = V.x, .y = V.y, .z = V.z})
typedef struct triangle_bbox TriangleBBox; typedef struct triangle_bbox TriangleBBox;
struct triangle_bbox { struct triangle_bbox {
@ -57,65 +56,16 @@ struct triangle_bbox {
u64 y1; u64 y1;
}; };
typedef struct i64x2 V2i;
struct i64x2 {
i64 x;
i64 y;
};
typedef struct u64x2 V2u;
struct u64x2 {
u64 x;
u64 y;
};
typedef struct f32x3 V3f;
struct f32x3 {
f32 x;
f32 y;
f32 z;
};
typedef struct f32x4 V4f;
struct f32x4 {
f32 x;
f32 y;
f32 z;
f32 w;
};
typedef struct u64x3 V3u;
struct u64x3 {
u64 x;
u64 y;
u64 z;
};
typedef struct f32_3x3 M3x3f;
struct f32_3x3 {
V3f row0;
V3f row1;
V3f row2;
};
typedef struct f32_4x4 M4x4f;
struct f32_4x4 {
V4f row0;
V4f row1;
V4f row2;
V4f row3;
};
internal void render_triangle(const Triangle *triangle, const Model *model, internal void render_triangle(const Triangle *triangle, const Model *model,
Render *render, Colour colour, RenderType type, Render *render, Colour colour, RenderType type,
ProjectionType projection); ProjectionType projection);
internal void fill_triangle(Render *render, Vertex vertices[TRIANGLE_VERTICES], internal void fill_triangle(Render *render, V3f vertices[TRIANGLE_VERTICES],
TexCoord coordinates[TRIANGLE_VERTICES], V2f coordinates[TRIANGLE_VERTICES], Colour colour,
Colour colour, f32 intensity, Image *texture); f32 intensity, Image *texture);
internal void reorder_points(V2u vertices[TRIANGLE_VERTICES], internal void reorder_points(V2u vertices[TRIANGLE_VERTICES],
TexCoord coordinates[TRIANGLE_VERTICES]); V2f coordinates[TRIANGLE_VERTICES]);
internal TriangleBBox get_triangle_bbox(const Image *img, internal TriangleBBox get_triangle_bbox(const Image *img,
Vertex vertices[TRIANGLE_VERTICES]); V3f vertices[TRIANGLE_VERTICES]);
internal V3f get_barycentric_coords(f32 d00, f32 d01, f32 d11, f32 denom, internal V3f get_barycentric_coords(f32 d00, f32 d01, f32 d11, f32 denom,
const V2i *ab, const V2i *ac, const V2i *ab, const V2i *ac,
const V2i *ap); const V2i *ap);
@ -145,8 +95,8 @@ Model load_obj_file(Arena *arena, const char *filename, const char *texture) {
} }
Model model = (Model){ Model model = (Model){
.vertices = list_create(Vertex, arena), .vertices = list_create(V3f, arena),
.texture_coordinates = list_create(TexCoord, arena), .texture_coordinates = list_create(V2f, arena),
.triangles = list_create(Triangle, arena), .triangles = list_create(Triangle, arena),
}; };
if (!(model.vertices) || !(model.texture_coordinates) || !(model.triangles)) { if (!(model.vertices) || !(model.texture_coordinates) || !(model.triangles)) {
@ -155,8 +105,8 @@ Model load_obj_file(Arena *arena, const char *filename, const char *texture) {
char line[8192]; char line[8192];
char identifier[8]; char identifier[8];
Vertex vertex; V3f vertex;
TexCoord coord; V2f coord;
Triangle triangle; Triangle triangle;
f32 vx, vy, vz; f32 vx, vy, vz;
f32 u, v; f32 u, v;
@ -172,12 +122,12 @@ Model load_obj_file(Arena *arena, const char *filename, const char *texture) {
vertex.x = vx; vertex.x = vx;
vertex.y = vy; vertex.y = vy;
vertex.z = vz; vertex.z = vz;
list_append(Vertex, arena, model.vertices, vertex); list_append(V3f, arena, model.vertices, vertex);
} else if (strncmp(identifier, "vt", 8) == 0) { } else if (strncmp(identifier, "vt", 8) == 0) {
sscanf(line + 2, "%f %f", &u, &v); sscanf(line + 2, "%f %f", &u, &v);
coord.u = u; coord.u = u;
coord.v = v; coord.v = v;
list_append(TexCoord, arena, model.texture_coordinates, coord); list_append(V2f, arena, model.texture_coordinates, coord);
} else if (strncmp(identifier, "f", 8) == 0) { } else if (strncmp(identifier, "f", 8) == 0) {
sscanf(line + 2, "%lu/%lu/%lu %lu/%lu/%lu %lu/%lu/%lu", &fp0, &tx0, sscanf(line + 2, "%lu/%lu/%lu %lu/%lu/%lu %lu/%lu/%lu", &fp0, &tx0,
&ign_0_2, &fp1, &tx1, &ign_1_2, &fp2, &tx2, &ign_2_2); &ign_0_2, &fp1, &tx1, &ign_1_2, &fp2, &tx2, &ign_2_2);
@ -237,12 +187,12 @@ internal void render_triangle(const Triangle *triangle, const Model *model,
Render *render, Colour colour, RenderType type, Render *render, Colour colour, RenderType type,
ProjectionType projection) { ProjectionType projection) {
Image *img = &(render->img); Image *img = &(render->img);
Vertex vertices[TRIANGLE_VERTICES] = { V3f vertices[TRIANGLE_VERTICES] = {
list_get(model->vertices, triangle->p0), list_get(model->vertices, triangle->p0),
list_get(model->vertices, triangle->p1), list_get(model->vertices, triangle->p1),
list_get(model->vertices, triangle->p2), list_get(model->vertices, triangle->p2),
}; };
TexCoord coordinates[TRIANGLE_VERTICES] = { V2f coordinates[TRIANGLE_VERTICES] = {
list_get(model->texture_coordinates, triangle->tx0), list_get(model->texture_coordinates, triangle->tx0),
list_get(model->texture_coordinates, triangle->tx1), list_get(model->texture_coordinates, triangle->tx1),
list_get(model->texture_coordinates, triangle->tx2), list_get(model->texture_coordinates, triangle->tx2),
@ -251,7 +201,6 @@ internal void render_triangle(const Triangle *triangle, const Model *model,
if (projection == PROJECTION_TYPE_PERSPECTIVE) { if (projection == PROJECTION_TYPE_PERSPECTIVE) {
// Basic perspective projection // Basic perspective projection
V4f vertex; V4f vertex;
V3f projected;
for (u64 i = 0; i < TRIANGLE_VERTICES; ++i) { for (u64 i = 0; i < TRIANGLE_VERTICES; ++i) {
vertex = (V4f){ vertex = (V4f){
.x = vertices[i].x, .x = vertices[i].x,
@ -260,13 +209,12 @@ internal void render_triangle(const Triangle *triangle, const Model *model,
.w = 1.0f, .w = 1.0f,
}; };
vertex = mat4x4_mul_vec4(g_cam_matrix, vertex); vertex = mat4x4_mul_vec4(g_cam_matrix, vertex);
projected = project_vec4(vertex); vertices[i] = project_vec4(vertex);
vertices[i] = vec3_to_vertex(projected);
} }
} }
if (type == RENDER_TYPE_WIREFRAME) { if (type == RENDER_TYPE_WIREFRAME) {
Vertex v0, v1; V3f v0, v1;
u64 x0, y0, x1, y1; u64 x0, y0, x1, y1;
for (u64 i = 0; i < TRIANGLE_VERTICES; ++i) { for (u64 i = 0; i < TRIANGLE_VERTICES; ++i) {
v0 = vertices[i]; v0 = vertices[i];
@ -299,9 +247,9 @@ internal void render_triangle(const Triangle *triangle, const Model *model,
} }
} }
internal void fill_triangle(Render *render, Vertex vertices[TRIANGLE_VERTICES], internal void fill_triangle(Render *render, V3f vertices[TRIANGLE_VERTICES],
TexCoord coordinates[TRIANGLE_VERTICES], V2f coordinates[TRIANGLE_VERTICES], Colour colour,
Colour colour, f32 intensity, Image *texture) { f32 intensity, Image *texture) {
Image *img = &(render->img); Image *img = &(render->img);
Depth *depth = &(render->depth); Depth *depth = &(render->depth);
TriangleBBox bbox = get_triangle_bbox(img, vertices); TriangleBBox bbox = get_triangle_bbox(img, vertices);
@ -366,7 +314,7 @@ internal void fill_triangle(Render *render, Vertex vertices[TRIANGLE_VERTICES],
} }
internal TriangleBBox get_triangle_bbox(const Image *img, internal TriangleBBox get_triangle_bbox(const Image *img,
Vertex vertices[TRIANGLE_VERTICES]) { V3f vertices[TRIANGLE_VERTICES]) {
f32 x0 = min(vertices[0].x, min(vertices[1].x, vertices[2].x)); f32 x0 = min(vertices[0].x, min(vertices[1].x, vertices[2].x));
f32 x1 = max(vertices[0].x, max(vertices[1].x, vertices[2].x)); f32 x1 = max(vertices[0].x, max(vertices[1].x, vertices[2].x));
// NOTE (Abdelrahman): Because y is flipped, we use max for the minimum and // NOTE (Abdelrahman): Because y is flipped, we use max for the minimum and

82
src/obj.h
View File

@ -9,19 +9,6 @@
#define NULL_MODEL ((Model){0}) #define NULL_MODEL ((Model){0})
#define INVALID_MODEL(m) (m.vertices == NULL || m.triangles == NULL) #define INVALID_MODEL(m) (m.vertices == NULL || m.triangles == NULL)
typedef struct vertex Vertex;
struct vertex {
f32 x;
f32 y;
f32 z;
};
typedef struct texcoord TexCoord;
struct texcoord {
f32 u;
f32 v;
};
typedef struct triangle Triangle; typedef struct triangle Triangle;
struct triangle { struct triangle {
u64 p0; u64 p0;
@ -32,6 +19,67 @@ struct triangle {
u64 tx2; u64 tx2;
}; };
typedef struct i64x2 V2i;
struct i64x2 {
i64 x;
i64 y;
};
typedef struct u64x2 V2u;
struct u64x2 {
u64 x;
u64 y;
};
typedef struct f32x2 V2f;
struct f32x2 {
union {
f32 x;
f32 u;
};
union {
f32 y;
f32 v;
};
};
typedef struct f32x3 V3f;
struct f32x3 {
f32 x;
f32 y;
f32 z;
};
typedef struct f32x4 V4f;
struct f32x4 {
f32 x;
f32 y;
f32 z;
f32 w;
};
typedef struct u64x3 V3u;
struct u64x3 {
u64 x;
u64 y;
u64 z;
};
typedef struct f32_3x3 M3x3f;
struct f32_3x3 {
V3f row0;
V3f row1;
V3f row2;
};
typedef struct f32_4x4 M4x4f;
struct f32_4x4 {
V4f row0;
V4f row1;
V4f row2;
V4f row3;
};
typedef enum { typedef enum {
RENDER_TYPE_WIREFRAME, RENDER_TYPE_WIREFRAME,
RENDER_TYPE_FILLED, RENDER_TYPE_FILLED,
@ -54,14 +102,14 @@ typedef enum {
COUNT_PROJECTION_TYPE, COUNT_PROJECTION_TYPE,
} ProjectionType; } ProjectionType;
MAKE_LIST_TYPE(Vertex); MAKE_LIST_TYPE(V3f);
MAKE_LIST_TYPE(TexCoord); MAKE_LIST_TYPE(V2f);
MAKE_LIST_TYPE(Triangle); MAKE_LIST_TYPE(Triangle);
typedef struct model Model; typedef struct model Model;
struct model { struct model {
LIST_TYPE(Vertex) * vertices; LIST_TYPE(V3f) * vertices;
LIST_TYPE(TexCoord) * texture_coordinates; LIST_TYPE(V2f) * texture_coordinates;
LIST_TYPE(Triangle) * triangles; LIST_TYPE(Triangle) * triangles;
Image *texture; Image *texture;
}; };