diff options
Diffstat (limited to 'sponge.h')
| -rw-r--r-- | sponge.h | 89 |
1 files changed, 88 insertions, 1 deletions
@@ -1,7 +1,7 @@ #include <stdint.h> +#include <math.h> typedef union { - // do not rely on byte order of this field (unless you only support one platform) uint32_t value; struct { uint8_t b; @@ -90,6 +90,7 @@ sponge_Mat4 sponge_mat4_translate(float x, float y, float z); // TODO(kard): quaternion type beat sponge_Mat4 sponge_mat4_rotate(float x, float y, float z); // y -> x -> z order sponge_Mat4 sponge_mat4_scale(float x, float y, float z); +sponge_Mat4 sponge_mat4_projection(float fov_y, float aspect, float near, float far); // right-handed, looking down -z // checks if tex.width or tex.height is equal to 0 @@ -98,6 +99,7 @@ int32_t sponge_texture_valid(sponge_Texture tex); // first argument is always rendering target (canvas) void sponge_clear (sponge_Texture c, sponge_Color32 col); +void sponge_clear_3d (sponge_Texture c, float *depths, sponge_Color32 col); void sponge_draw_rect (sponge_Texture c, sponge_Vec2I v0, sponge_Vec2I v1, sponge_Color32 col); void sponge_draw_line (sponge_Texture c, sponge_Vec2I v0, sponge_Vec2I v1, sponge_Color32 col); @@ -127,6 +129,13 @@ void sponge_draw_triangle_uv( sponge_Vec2I v0, sponge_Vec2I v1, sponge_Vec2I v2, sponge_Vec2 uv0, sponge_Vec2 uv1, sponge_Vec2 uv2, sponge_Texture tex); + +void sponge_draw_mesh_col( + sponge_Texture c, float *depths, + sponge_Mat4 model, sponge_Mat4 view, sponge_Mat4 proj, + sponge_Vec3 *positions, sponge_Color32 *colors, int32_t *triangles, size_t triangles_count); + + #define SPONGE_CLAMP(val, min, max) ((val) < (min) ? (min) : ((val) > (max) ? (max) : (val))) #define SPONGE_MIN(x, y) ((x) < (y) ? (x) : (y)) #define SPONGE_MAX(x, y) ((x) > (y) ? (x) : (y)) @@ -299,6 +308,16 @@ sponge_Mat4 sponge_mat4_scale(float x, float y, float z) { return m; } +sponge_Mat4 sponge_mat4_projection(float fov_y, float aspect, float znear, float zfar) { + float f = 1.0f / tanf(fov_y / 2.0f); + sponge_Mat4 m; + m.c00 = f / aspect; m.c01 = 0.0f; m.c02 = 0.0f; m.c03 = 0.0f; + m.c10 = 0.0f; m.c11 = f; m.c12 = 0.0f; m.c13 = 0.0f; + m.c20 = 0.0f; m.c21 = 0.0f; m.c22 = -zfar / (zfar - znear); m.c23 = (-znear * zfar) / (zfar - znear); + m.c30 = 0.0f; m.c31 = 0.0f; m.c32 = -1.0f; m.c33 = 0.0f; + return m; +} + int32_t sponge_texture_valid(sponge_Texture tex) { return tex.width != 0 && tex.height != 0 && tex.stride_pixels != 0; @@ -314,6 +333,15 @@ void sponge_clear(sponge_Texture c, sponge_Color32 col) { } } } +void sponge_clear_3d(sponge_Texture c, float *depths, sponge_Color32 col) { + sponge_clear(c, col); + float *row = depths; + for (uint32_t y = 0; y < c.height; y++, row += c.stride_pixels) { + for (uint32_t x = 0; x < c.width; x++) { + row[x] = INFINITY; + } + } +} void sponge_draw_rect(sponge_Texture c, sponge_Vec2I v0, sponge_Vec2I v1, sponge_Color32 col) { SPONGE_ASSERT(sponge_texture_valid(c)); @@ -474,4 +502,63 @@ void sponge_draw_triangle_uv( } } + +void sponge_draw_mesh_col( + sponge_Texture c, float *depths, + sponge_Mat4 model, sponge_Mat4 view, sponge_Mat4 proj, + sponge_Vec3 *positions, sponge_Color32 *colors, int32_t *triangles, size_t triangles_count +) { + sponge_Mat4 mvp = sponge_mat4_mul_mat4(sponge_mat4_mul_mat4(model, view), proj); + for (size_t i = 0; i < triangles_count; i += 3) { + int32_t t0 = triangles[i + 0]; + int32_t t1 = triangles[i + 1]; + int32_t t2 = triangles[i + 2]; + + sponge_Vec3 v0 = positions[t0]; + sponge_Vec3 v1 = positions[t1]; + sponge_Vec3 v2 = positions[t2]; + + v0 = sponge_vec3_mul_mat4(v0, mvp); + v1 = sponge_vec3_mul_mat4(v1, mvp); + v2 = sponge_vec3_mul_mat4(v2, mvp); + + // TODO(kard): clipping + + sponge_Vec2I v0i = sponge_vec2i_make((int32_t)((v0.x + 1.0f) * (c.width / 2)), (int32_t)((v0.y + 1.0f) * (c.height / 2))); + sponge_Vec2I v1i = sponge_vec2i_make((int32_t)((v1.x + 1.0f) * (c.width / 2)), (int32_t)((v1.y + 1.0f) * (c.height / 2))); + sponge_Vec2I v2i = sponge_vec2i_make((int32_t)((v2.x + 1.0f) * (c.width / 2)), (int32_t)((v2.y + 1.0f) * (c.height / 2))); + v0i.y = c.height - v0i.y; + v1i.y = c.height - v1i.y; + v2i.y = c.height - v2i.y; + + + sponge_Vec2I min, max; + float area2; + sponge_draw_triangle_init(c, v0i, v1i, v2i, &min, &max, &area2); + sponge_Color32 *row = c.pixels + (min.y * c.stride_pixels); + float *depth_row = depths + (min.y * c.stride_pixels); + + for (int32_t y = min.y; y <= max.y; y++, row += c.stride_pixels, depth_row += c.stride_pixels) { + for (int32_t x = min.x; x <= max.x; x++) { + float w0, w1, w2; + if (sponge_draw_triangle_iter(sponge_vec2i_make(x, y), v0i, v1i, v2i, area2, &w0, &w1, &w2)) { + float depth = (v0.z * w0) + (v1.z * w1) + (v2.z * w2); + if (depth < depth_row[x] && depth <= 1.0f && depth >= 0.0f) { + depth_row[x] = depth; + + sponge_ColorF c0 = sponge_color32_to_colorf(colors[t0]); + sponge_ColorF c1 = sponge_color32_to_colorf(colors[t1]); + sponge_ColorF c2 = sponge_color32_to_colorf(colors[t2]); + sponge_ColorF result = sponge_vec4_make(0.0f, 0.0f, 0.0f, 0.0f); + result = sponge_vec4_add(result, sponge_vec4_mul(c0, w0)); + result = sponge_vec4_add(result, sponge_vec4_mul(c1, w1)); + result = sponge_vec4_add(result, sponge_vec4_mul(c2, w2)); + row[x] = sponge_colorf_to_color32(result); + } + } + } + } + } +} + #endif // SPONGE_IMPLEMENTATION |