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#include <lcq/gastro/test.h>
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
static i64 off = 0;
static gastro_program program;
static qoi_color *texture;
static i64 texture_width;
static i64 texture_height;
#define QUADIDX(p0, p1, p2, p3) p0, p1, p2, p2, p3, p0
#define COLOR(r, g, b) gastro_fix_new(r), gastro_fix_new(g), gastro_fix_new(b)
static void draw_quad(gastro_ctx *ctx, gastro_program *p) {
gastro_fix sz = GASTRO_FIX_HALF;
gastro_fix verts[] = {
/* front */
-sz, -sz, -sz, 0, 0,
+sz, -sz, -sz, GASTRO_FIX_ONE, 0,
+sz, +sz, -sz, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
-sz, +sz, -sz, 0, GASTRO_FIX_ONE
};
i64 idxs[] = {
QUADIDX(0, 1, 2, 3), /* front */
};
gastro_render_triangles(ctx, p, verts, 5, idxs, 2);
}
static void draw_cube(gastro_ctx *ctx, gastro_program *p) {
static gastro_fix verts[] = {
/* front */
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, 0, 0,
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
+GASTRO_FIX_HALF, +GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
-GASTRO_FIX_HALF, +GASTRO_FIX_HALF, -GASTRO_FIX_HALF, 0, GASTRO_FIX_ONE,
/* right */
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, 0, 0,
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
+GASTRO_FIX_HALF, +GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
+GASTRO_FIX_HALF, +GASTRO_FIX_HALF, -GASTRO_FIX_HALF, 0, GASTRO_FIX_ONE,
/* left */
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, 0, 0,
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
-GASTRO_FIX_HALF, +GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
-GASTRO_FIX_HALF, +GASTRO_FIX_HALF, +GASTRO_FIX_HALF, 0, GASTRO_FIX_ONE,
/* top */
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, 0, 0,
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, 0, GASTRO_FIX_ONE,
/* bottom */
-GASTRO_FIX_HALF, +GASTRO_FIX_HALF, -GASTRO_FIX_HALF, 0, 0,
+GASTRO_FIX_HALF, +GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
+GASTRO_FIX_HALF, +GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
-GASTRO_FIX_HALF, +GASTRO_FIX_HALF, +GASTRO_FIX_HALF, 0, GASTRO_FIX_ONE,
/* back */
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, 0, 0,
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
-GASTRO_FIX_HALF, +GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
+GASTRO_FIX_HALF, +GASTRO_FIX_HALF, +GASTRO_FIX_HALF, 0, GASTRO_FIX_ONE
};
static i64 idxs[] = {
QUADIDX(0, 1, 2, 3), /* front */
QUADIDX(4, 5, 6, 7), /* right */
QUADIDX(8, 9, 10, 11), /* left */
QUADIDX(12, 13, 14, 15), /* top */
QUADIDX(16, 17, 18, 19), /* bottom */
QUADIDX(20, 21, 22, 23) /* back */
};
gastro_render_triangles(ctx, p, verts, 5, idxs, 12);
}
static void draw_pyramid(gastro_ctx *ctx, gastro_program *p) {
static gastro_fix verts[] = {
/* front */
0, +GASTRO_FIX_HALF, 0, 0, 0,
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
/* right */
0, +GASTRO_FIX_HALF, 0, 0, 0,
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
/* left */
0, +GASTRO_FIX_HALF, 0, 0, 0,
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
/* back */
0, +GASTRO_FIX_HALF, 0, 0, 0,
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
/* bottom */
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, 0, 0,
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, -GASTRO_FIX_HALF, GASTRO_FIX_ONE, 0,
+GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, GASTRO_FIX_ONE, GASTRO_FIX_ONE,
-GASTRO_FIX_HALF, -GASTRO_FIX_HALF, +GASTRO_FIX_HALF, 0, GASTRO_FIX_ONE,
};
static i64 idxs[] = {
0, 1, 2,
3, 4, 5,
6, 7, 8,
9, 10, 11,
QUADIDX(12, 13, 14, 15),
};
gastro_render_triangles(ctx, p, verts, 5, idxs, 6);
}
static gastro_vec4 vertex_shader(gastro_ctx *ctx, gastro_vec3 in, gastro_fix *attrs, i64 attrs_len) {
gastro_fix x = gastro_fix_from_double((double) off / 1000.0);
gastro_vec4 v = gastro_vec4_new(in.x, in.y, in.z, GASTRO_FIX_ONE);
gastro_mat4x4 scale = gastro_mat4x4_new(
gastro_fix_from_double(1.0), 0, 0, 0,
0, gastro_fix_from_double(1.0), 0, 0,
0, 0, gastro_fix_from_double(1.0), 0,
0, 0, 0, GASTRO_FIX_ONE
);
u8 theta = (u8) (off / 4);
/* u8 theta = 13; */
gastro_mat4x4 rot = gastro_mat4x4_new(
GASTRO_FIX_ONE, 0, 0, 0,
0, gastro_cos(theta), -gastro_sin(theta), 0,
0, gastro_sin(theta), gastro_cos(theta), 0,
0, 0, 0, GASTRO_FIX_ONE
);
gastro_mat4x4 trans = gastro_mat4x4_new(
GASTRO_FIX_ONE, 0, 0, gastro_fix_new(0), /* x,*/
0, GASTRO_FIX_ONE, 0, gastro_fix_new(1),
0, 0, GASTRO_FIX_ONE, gastro_fix_new(-3),
0, 0, 0, GASTRO_FIX_ONE
);
gastro_mat4x4 proj = gastro_mat4x4_new(
GASTRO_FIX_ONE, 0, 0, 0,
0, GASTRO_FIX_ONE, 0, 0,
0, 0, GASTRO_FIX_ONE, 0,
0, 0, GASTRO_FIX_ONE, 0
);
v = gastro_mat4x4_mul_vec4(scale, v);
v = gastro_mat4x4_mul_vec4(rot, v);
v = gastro_mat4x4_mul_vec4(trans, v);
v = gastro_mat4x4_mul_vec4(proj, v);
return v;
}
static gastro_color fragment_shader_texture(gastro_ctx *ctx, gastro_vec3 in, gastro_fix *attrs, i64 attrs_len) {
gastro_fix u = attrs[0];
gastro_fix v = attrs[1];
i64 x = gastro_fix_to_i64(gastro_fix_mul(gastro_fix_new(texture_width), u));
i64 y = gastro_fix_to_i64(gastro_fix_mul(gastro_fix_new(texture_height), v));
qoi_color c = texture[y * texture_width + x];
return gastro_color_new(c.r, c.g, c.b, c.a);
}
static gastro_color fragment_shader_teapot(gastro_ctx *ctx, gastro_vec3 in, gastro_fix *attrs, i64 attrs_len) {
u8 col = (u8) gastro_fix_to_i64(
gastro_fix_mul(
gastro_fix_new(0xff),
gastro_fix_div(in.z, gastro_fix_new(8))
)
);
return gastro_color_new(0xff - col, 0xff - col, 0xff - col, 0xff);
}
static bool load_image(char *path) {
FILE *f;
u8 *buf;
i64 len;
qoi_decoder q;
qoi_header h;
qoi_color *pixels;
if (!(f = fopen(path, "r"))) {
fprintf(stderr, "failed to open file: %s\n", path);
return false;
}
fseek(f, 0, SEEK_END);
len = ftell(f);
fseek(f, 0, SEEK_SET);
buf = calloc((size_t) len, sizeof(u8));
fread(buf, sizeof(u8), (size_t) len, f);
qoi_decoder_new(&q, buf, len);
if (!qoi_decode_header(&q, &h)) {
fprintf(stderr, "failed to decode header\n");
return false;
}
pixels = calloc(h.width * h.height, sizeof(qoi_color));
qoi_decode(&q, &h, pixels);
texture = pixels;
texture_width = h.width;
texture_height = h.height;
return true;
}
bool gastro_test_create() {
program.vertex = vertex_shader;
program.fragment = fragment_shader_texture;
if (!load_image("test.qoi")) return false;
return true;
}
void gastro_test_render(gastro_ctx *ctx) {
gastro_draw_clear(ctx, gastro_color_new(0, 0, 0, 0xff));
for (i64 i = 0; i < 1; ++i) {
draw_pyramid(ctx, &program);
}
/* draw_quad(&ctx, &p); */
/* draw_model(&ctx, &p); */
off += 1;
off %= 256 * 64;
}
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