2 files changed, 93 insertions, 0 deletions
diff --git a/gastro/include/lcq/gastro.h b/gastro/include/lcq/gastro.h
new file mode 100644
index 0000000..fd4e158
--- /dev/null
+++ b/gastro/include/lcq/gastro.h
@@ -0,0 +1,83 @@
+#ifndef LCOLONQ_GASTRO_H
+#define LCOLONQ_GASTRO_H
+
+#include <lcq/prelude.h>
+
+#define GASTRO_FIXED_POINT 16
+typedef i64 gastro_fix;
+#define GASTRO_FIX_ONE (1 << GASTRO_FIXED_POINT)
+#define GASTRO_FIX_HALF 0x8000
+gastro_fix gastro_fix_new(i64 x);
+i64 gastro_fix_to_i64(gastro_fix x);
+gastro_fix gastro_fix_from_double(double x);
+double gastro_fix_to_double(gastro_fix x);
+gastro_fix gastro_fix_mul(gastro_fix x, gastro_fix y);
+gastro_fix gastro_fix_div(gastro_fix x, gastro_fix y);
+gastro_fix gastro_fix_sqrt(gastro_fix s);
+
+typedef struct { gastro_fix x, y; } gastro_vec2;
+gastro_vec2 gastro_vec2_new(gastro_fix x, gastro_fix y);
+gastro_vec2 gastro_vec2_add(gastro_vec2 x, gastro_vec2 y);
+gastro_vec2 gastro_vec2_sub(gastro_vec2 x, gastro_vec2 y);
+gastro_fix gastro_vec2_length(gastro_vec2 v);
+gastro_fix gastro_vec2_cross(gastro_vec2 v, gastro_vec2 u);
+typedef struct { gastro_fix x, y, z; } gastro_vec3;
+gastro_vec3 gastro_vec3_new(gastro_fix x, gastro_fix y, gastro_fix z);
+void gastro_vec3_print(gastro_vec3 v);
+gastro_vec2 gastro_vec3_xy(gastro_vec3 v);
+gastro_vec3 gastro_vec3_perspective(gastro_fix nearz, gastro_vec3 p);
+gastro_fix gastro_vec3_bary_interpolate(gastro_vec3 bary, gastro_fix x, gastro_fix y, gastro_fix z);
+gastro_fix gastro_vec3_bary_interpolate_inv(gastro_vec3 bary, gastro_fix x, gastro_fix y, gastro_fix z);
+typedef struct { gastro_fix x, y, z, w; } gastro_vec4;
+gastro_vec4 gastro_vec4_new(gastro_fix x, gastro_fix y, gastro_fix z, gastro_fix w);
+void gastro_vec4_print(gastro_vec4 v);
+gastro_vec3 gastro_vec4_xyz(gastro_vec4 v);
+gastro_fix gastro_vec4_idx(gastro_vec4 v, i64 idx);
+gastro_fix gastro_vec4_dot(gastro_vec4 a, gastro_vec4 b);
+
+typedef struct { gastro_vec4 rows[4]; } gastro_mat4x4;
+gastro_mat4x4 gastro_mat4x4_new(
+    gastro_fix  e0, gastro_fix  e1, gastro_fix  e2, gastro_fix  e3,
+    gastro_fix  e4, gastro_fix  e5, gastro_fix  e6, gastro_fix  e7,
+    gastro_fix  e8, gastro_fix  e9, gastro_fix e10, gastro_fix e11,
+    gastro_fix e12, gastro_fix e13, gastro_fix e14, gastro_fix e15);
+void gastro_mat4x4_print(gastro_mat4x4 m);
+gastro_vec4 gastro_mat4x4_mul_vec4(gastro_mat4x4 m, gastro_vec4 v);
+gastro_mat4x4 gastro_mat4x4_mul_mat4x4(gastro_mat4x4 m, gastro_mat4x4 n);
+
+typedef struct {
+    u8 r, g, b, a;
+} gastro_color;
+gastro_color gastro_color_new(u8 r, u8 g, u8 b, u8 a);
+
+typedef struct {
+    u32 width, height;
+    gastro_color *pixels;
+    gastro_fix *depth;
+} gastro_ctx;
+
+gastro_vec3 gastro_vec3_denormalize(gastro_ctx *ctx, gastro_vec3 p);
+
+void gastro_ctx_init(gastro_ctx *ret, u32 width, u32 height, gastro_color *pixels, gastro_fix *depth);
+void gastro_draw_pixel(gastro_ctx *ctx, gastro_color col, gastro_fix z, i64 x, i64 y);
+void gastro_draw_clear(gastro_ctx *ctx, gastro_color col);
+
+typedef struct {
+    gastro_vec3 v;
+    gastro_fix *attrs;
+} gastro_vertex;
+typedef gastro_vec4 (*gastro_shader_vertex)(gastro_ctx *ctx, gastro_vec3 v, gastro_fix *attrs, i64 attrs_len);
+typedef gastro_color (*gastro_shader_fragment)(gastro_ctx *ctx, gastro_vec3 v, gastro_fix *attrs, i64 attrs_len);
+typedef struct {
+    gastro_shader_vertex vertex;
+    gastro_shader_fragment fragment;
+} gastro_program;
+gastro_vertex gastro_program_vertex(gastro_ctx *ctx, gastro_program *p, gastro_vec3 v, gastro_fix *attrs, i64 attrs_len);
+gastro_color gastro_program_fragment(gastro_ctx *ctx, gastro_program *p, gastro_vec3 v, gastro_fix *attrs, i64 attrs_len);
+
+void gastro_render_triangle(gastro_ctx *ctx, gastro_program *p, gastro_vertex p0, gastro_vertex p1, gastro_vertex p2, i64 attrs_len);
+void gastro_render_triangles(gastro_ctx *ctx, gastro_program *p, gastro_fix *vs, i64 elem_size, i64 *idxs, i64 num_triangles);
+
+#include <lcq/gastro/trig.h>
+
+#endif
diff --git a/gastro/include/lcq/gastro/trig.h b/gastro/include/lcq/gastro/trig.h
new file mode 100644
index 0000000..ec5c8c3
--- /dev/null
+++ b/gastro/include/lcq/gastro/trig.h
@@ -0,0 +1,10 @@
+#ifndef LCOLONQ_GASTRO_TRIG_H
+#define LCOLONQ_GASTRO_TRIG_H
+
+#include <lcq/prelude.h>
+#include <lcq/gastro.h>
+
+gastro_fix gastro_sin(u8 turns);
+gastro_fix gastro_cos(u8 turns);
+
+#endif