gastro: render test scene

10 files changed, 231 insertions, 206 deletions

diff --git a/flake.lock b/flake.lock
index 286dd77..c900437 100644
--- a/flake.lock
+++ b/flake.lock
@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1738553537,
-        "narHash": "sha256-HrrsuYIOl14dreCDUsXQGrWxdiU8LPKxcIo759jUk6Q=",
+        "lastModified": 1787814960,
+        "narHash": "sha256-PYZq1qzCJXC2zGI0mH07vrZBsw6DRBAOX0jN1pPtqOQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "2d31b9476b7c6f5b029e595586b0b112a7ad130b",
+        "rev": "c27cdad491a991b11ed731760aa2ef8db0cb0410",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 9421eed..601b232 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,7 +13,7 @@
           lcq = builtins.mapAttrs (nm: _: (import ./${nm}/packages.nix) pkgs lcq) subpackages;
           defaultShell = {
             nativeBuildInputs = [
-              pkgs.musl
+              # pkgs.musl
               pkgs.valgrind
               pkgs.universal-ctags
             ];
diff --git a/gastro/.envrc b/gastro/.envrc
index c4b17d7..321526b 100644
--- a/gastro/.envrc
+++ b/gastro/.envrc
@@ -1 +1 @@
-use_flake
+use_flake .#gastro
diff --git a/gastro/Makefile b/gastro/Makefile
index 9a99afd..3a99e10 100644
--- a/gastro/Makefile
+++ b/gastro/Makefile
@@ -1,12 +1,12 @@
 CC ?= gcc
 AR ?= ar
 override CPPFLAGS += -MMD -MP
-override CFLAGS += -O2 --std=c99 -g -Ideps/ -Isrc/ -Iinclude/ -Wall -Wextra -Wconversion -Wformat-security -Wshadow -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wnull-dereference -Wfloat-equal -Wundef -Wpointer-arith -Wbad-function-cast -Wlogical-op -Wmissing-braces -Wcast-align -Wstrict-overflow=5
+override CFLAGS += --std=c99 -g -Ideps/ -Isrc/ -Iinclude/ -Wall -Wextra -Wconversion -Wformat-security -Wshadow -Wpointer-arith -Wstrict-prototypes -Wmissing-prototypes -Wnull-dereference -Wfloat-equal -Wundef -Wpointer-arith -Wbad-function-cast -Wlogical-op -Wmissing-braces -Wcast-align -Wstrict-overflow=5 -fwrapv
 override LDFLAGS += -g -lraylib -lcolonq-qoi
 
 BUILD = build_$(CC)
 
-SRCS := src/gastro.c src/trig.c
+SRCS := src/gastro.c src/trig.c src/test.c
 CHK_SOURCES ?= $(SRCS)
 OBJECTS := $(SRCS:src/%.c=$(BUILD)/%.o)
 EXE := gastro
diff --git a/gastro/include/lcq/gastro/test.h b/gastro/include/lcq/gastro/test.h
new file mode 100644
index 0000000..cf4e1d2
--- /dev/null
+++ b/gastro/include/lcq/gastro/test.h
@@ -0,0 +1,11 @@
+#ifndef LCOLONQ_GASTRO_TEST_H
+#define LCOLONQ_GASTRO_TEST_H
+
+#include <lcq/prelude.h>
+#include <lcq/gastro.h>
+#include <lcq/qoi.h>
+
+bool gastro_test_create(void);
+void gastro_test_render(gastro_ctx *ctx);
+
+#endif
diff --git a/gastro/src/main.c b/gastro/src/main.c
index af2e3aa..b0caf7c 100644
--- a/gastro/src/main.c
+++ b/gastro/src/main.c
@@ -6,204 +6,18 @@
 #include <lcq/qoi.h>
 
 #include <lcq/gastro.h>
+#include <lcq/gastro/test.h>
 
 /* #include "../converted_model.h" */
 
-i64 off = 0;
-qoi_color *TEXTURE;
-i64 TEXTURE_WIDTH;
-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);
-}
-
-void 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;
-    }
-    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;
-    }
-    pixels = calloc(h.width * h.height, sizeof(qoi_color));
-    qoi_decode(&q, &h, pixels);
-    TEXTURE = pixels;
-    TEXTURE_WIDTH = h.width;
-    TEXTURE_HEIGHT = h.height;
-}
-
 int main(int argc, char **argv) {
     gastro_ctx ctx;
     u32 width = 256, height = 256;
     gastro_color *pixels = calloc(width * height, sizeof(gastro_color));
     gastro_fix *depth = calloc(width * height, sizeof(gastro_fix));
-    gastro_program p;
     gastro_ctx_init(&ctx, width, height, pixels, depth);
-    p.vertex = vertex_shader;
-    p.fragment = fragment_shader_texture;
-
-    load_image("mark2.qoi");
 
-    /* gastro_draw_clear(&ctx, gastro_color_new(0, 0, 0, 0xff)); */
-    /* draw_model(&ctx, &p); */
+    gastro_test_create();
 
     InitWindow(800, 600, "test");
     {
@@ -217,17 +31,9 @@ int main(int argc, char **argv) {
         tex = LoadTextureFromImage(im);
         SetTargetFPS(300);
         while (!WindowShouldClose()) {
-            i64 i;
             Vector2 pos;
             pos.x = 10; pos.y = 10;
-            gastro_draw_clear(&ctx, gastro_color_new(0, 0, 0, 0xff));
-            for (i = 0; i < 1; ++i) {
-                draw_pyramid(&ctx, &p);
-            }
-            /* draw_quad(&ctx, &p); */
-            /* draw_model(&ctx, &p); */
-            off += 1;
-            off %= 256 * 64;
+            gastro_test_render(&ctx);
             BeginDrawing();
             ClearBackground(RED);
             UpdateTexture(tex, ctx.pixels);
diff --git a/gastro/src/test.c b/gastro/src/test.c
new file mode 100644
index 0000000..46ce6b1
--- /dev/null
+++ b/gastro/src/test.c
@@ -0,0 +1,203 @@
+#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 void 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;
+    }
+    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;
+    }
+    pixels = calloc(h.width * h.height, sizeof(qoi_color));
+    qoi_decode(&q, &h, pixels);
+    texture = pixels;
+    texture_width = h.width;
+    texture_height = h.height;
+}
+
+bool gastro_test_create() {
+    program.vertex = vertex_shader;
+    program.fragment = fragment_shader_texture;
+    load_image("test.qoi");
+}
+
+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;
+}
diff --git a/gastro/test.qoi b/gastro/test.qoi
new file mode 100644
index 0000000..6cc4cf8
--- /dev/null
+++ b/gastro/test.qoi
diff --git a/pit/Makefile b/pit/Makefile
index 2f74aba..0a9da88 100644
--- a/pit/Makefile
+++ b/pit/Makefile
@@ -29,7 +29,9 @@ bindir ?= $(exec_prefix)/bin
 includedir ?= $(prefix)/include
 libdir ?= $(exec_prefix)/lib
 
-.PHONY: all clean install install-bin install-headers install-core install-native check-syntax
+GDBFLAGS ?=
+
+.PHONY: all clean install install-bin install-headers install-core install-native check-syntax gdb
 
 all: $(EXE) $(LIB_CORE) $(LIB_NATIVE)
 
@@ -80,6 +82,9 @@ install-native: $(LIB_NATIVE)
 check-syntax: TAGS
 	gcc $(CFLAGS) -fsyntax-only $(CHK_SOURCES)
 
+gdb: $(EXE)
+	gdb $(GDBFLAGS) $(EXE)
+
 -include $(BUILD)/main.d
 -include $(OBJECTS_CORE:.o=.d)
 -include $(OBJECTS_NATIVE:.o=.d)
diff --git a/qoi/.envrc b/qoi/.envrc
index c4b17d7..a552670 100644
--- a/qoi/.envrc
+++ b/qoi/.envrc
@@ -1 +1 @@
-use_flake
+use_flake .#qoi