470 lines
16 KiB
C
470 lines
16 KiB
C
#include "draw.h"
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#include "gp.h"
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#include "math.h"
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#include "font.h"
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#include "scratch.h"
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#include "sprite.h"
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#include "collider.h"
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GLOBAL struct {
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struct gp_handle solid_white_texture;
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} G = ZI, DEBUG_ALIAS(G, G_draw);
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/* ========================== *
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* Startup
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* ========================== */
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struct draw_startup_receipt draw_startup(struct gp_startup_receipt *gp_sr,
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struct font_startup_receipt *font_sr)
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{
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(UNUSED)gp_sr;
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(UNUSED)font_sr;
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u32 pixel_white = 0xFFFFFFFF;
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G.solid_white_texture = gp_texture_alloc(GP_TEXTURE_FORMAT_R8G8B8A8_UNORM, 0, V2I32(1, 1), &pixel_white);
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return (struct draw_startup_receipt) { 0 };
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}
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/* ========================== *
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* Texture
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* ========================== */
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void draw_texture(struct gp_flow *flow, struct draw_texture_params params)
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{
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struct gp_cmd_desc cmd = ZI;
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cmd.kind = GP_CMD_KIND_DRAW_MATERIAL;
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cmd.material.xf = params.xf;
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cmd.material.sprite = params.sprite;
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cmd.material.texture = params.texture;
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cmd.material.clip = params.clip;
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cmd.material.tint = params.tint;
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cmd.material.emittance = params.emittance;
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gp_push_cmd(flow, &cmd);
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}
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/* ========================== *
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* Fill shapes
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* ========================== */
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void draw_poly_ex(struct gp_flow *flow, struct v2_array vertices, struct gp_indices indices, u32 color)
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{
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struct gp_cmd_desc cmd = ZI;
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cmd.kind = GP_CMD_KIND_DRAW_SHAPE;
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cmd.shape.vertices = vertices;
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cmd.shape.indices = indices;
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cmd.shape.color = color;
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gp_push_cmd(flow, &cmd);
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}
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/* Draws a filled polygon using triangles in a fan pattern */
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void draw_poly(struct gp_flow *flow, struct v2_array vertices, u32 color)
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{
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if (vertices.count >= 3) {
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struct arena_temp scratch = scratch_begin_no_conflict();
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u32 num_tris = vertices.count - 2;
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u32 num_indices = num_tris * 3;
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/* Generate indices in a fan pattern */
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struct gp_indices indices = {
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.count = num_indices,
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.indices = arena_push_array_no_zero(scratch.arena, u32, num_indices)
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};
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for (u32 i = 0; i < num_tris; ++i) {
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u32 tri_offset = i * 3;
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indices.indices[tri_offset + 0] = 0;
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indices.indices[tri_offset + 1] = (i + 1);
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indices.indices[tri_offset + 2] = (i + 2);
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}
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draw_poly_ex(flow, vertices, indices, color);
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scratch_end(scratch);
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}
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}
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void draw_circle(struct gp_flow *flow, struct v2 pos, f32 radius, u32 color, u32 detail)
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{
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struct arena_temp scratch = scratch_begin_no_conflict();
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struct v2 *points = arena_push_array_no_zero(scratch.arena, struct v2, detail);
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for(u32 i = 0; i < detail; ++i) {
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f32 angle = ((f32)i / (f32)detail) * TAU;
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struct v2 p = V2(
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radius * math_cos(angle),
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radius * math_sin(angle)
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);
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points[i] = v2_add(pos, p);
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}
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struct v2_array vertices = {
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.points = points,
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.count = detail
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};
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draw_poly(flow, vertices, color);
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scratch_end(scratch);
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}
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void draw_quad(struct gp_flow *flow, struct quad quad, u32 color)
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{
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LOCAL_PERSIST u32 indices_array[6] = {
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0, 1, 2,
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0, 2, 3
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};
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struct v2_array vertices = { .count = 4, .points = quad.e };
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struct gp_indices indices = { .count = 6, .indices = indices_array };
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draw_poly_ex(flow, vertices, indices, color);
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}
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/* ========================== *
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* Line shapes
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* ========================== */
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void draw_gradient_line(struct gp_flow *flow, struct v2 start, struct v2 end, f32 thickness, u32 start_color, u32 end_color)
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{
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#if 0
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struct quad quad = quad_from_line(start, end, thickness);
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draw_texture(flow, DRAW_TEXTURE_PARAMS(.texture = G.solid_white_texture, .tint0 = start_color, .tint1 = end_color, .quad = quad));
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#else
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/* Placeholder */
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(UNUSED)end_color;
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struct quad quad = quad_from_line(start, end, thickness);
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draw_quad(flow, quad, start_color);
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#endif
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}
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void draw_line(struct gp_flow *flow, struct v2 start, struct v2 end, f32 thickness, u32 color)
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{
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struct quad quad = quad_from_line(start, end, thickness);
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draw_quad(flow, quad, color);
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}
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void draw_ray(struct gp_flow *flow, struct v2 pos, struct v2 rel, f32 thickness, u32 color)
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{
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struct quad quad = quad_from_ray(pos, rel, thickness);
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draw_quad(flow, quad, color);
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}
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void draw_poly_line(struct gp_flow *flow, struct v2_array points, b32 loop, f32 thickness, u32 color)
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{
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if (points.count >= 2) {
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for (u64 i = 1; i < points.count; ++i) {
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struct v2 p1 = points.points[i - 1];
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struct v2 p2 = points.points[i];
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struct quad q = quad_from_line(p1, p2, thickness);
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draw_quad(flow, q, color);
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}
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if (loop && points.count > 2) {
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struct v2 p1 = points.points[points.count - 1];
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struct v2 p2 = points.points[0];
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struct quad q = quad_from_line(p1, p2, thickness);
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draw_quad(flow, q, color);
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}
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}
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}
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void draw_circle_line(struct gp_flow *flow, struct v2 pos, f32 radius, f32 thickness, u32 color, u32 detail)
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{
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struct arena_temp scratch = scratch_begin_no_conflict();
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struct v2 *points = arena_push_array_no_zero(scratch.arena, struct v2, detail);
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for (u32 i = 0; i < detail; ++i) {
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f32 angle = ((f32)i / (f32)detail) * TAU;
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struct v2 p = V2(
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radius * math_cos(angle),
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radius * math_sin(angle)
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);
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points[i] = v2_add(pos, p);
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}
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struct v2_array a = {
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.points = points,
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.count = detail
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};
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draw_poly_line(flow, a, true, thickness, color);
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scratch_end(scratch);
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}
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void draw_quad_line(struct gp_flow *flow, struct quad quad, f32 thickness, u32 color)
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{
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struct v2 points[] = { quad.p0, quad.p1, quad.p2, quad.p3 };
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struct v2_array a = { .points = points, .count = ARRAY_COUNT(points) };
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draw_poly_line(flow, a, true, thickness, color);
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}
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void draw_arrow_line(struct gp_flow *flow, struct v2 start, struct v2 end, f32 thickness, f32 arrowhead_height, u32 color)
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{
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const f32 head_width_ratio = 0.5f; /* Width of arrowhead relative to its length */
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const f32 max_height_to_line_ratio = 0.9f; /* Maximum length of arrowhead relative to total line length */
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arrowhead_height = min_f32(arrowhead_height, v2_len(v2_sub(end, start)) * max_height_to_line_ratio);
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struct v2 head_start_dir = v2_sub(start, end);
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head_start_dir = v2_norm(head_start_dir);
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head_start_dir = v2_mul(head_start_dir, arrowhead_height);
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struct v2 head_start = v2_add(end, head_start_dir);
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struct v2 head_p1_dir = v2_perp_mul(head_start_dir, head_width_ratio);
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struct v2 head_p2_dir = v2_neg(head_p1_dir);
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struct v2 head_p1 = v2_add(head_start, head_p1_dir);
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struct v2 head_p2 = v2_add(head_start, head_p2_dir);
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struct v2 head_points[] = { end, head_p1, head_p2 };
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struct v2_array head_points_v2_array = {
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.points = head_points,
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.count = ARRAY_COUNT(head_points)
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};
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draw_poly(flow, head_points_v2_array, color);
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struct quad line_quad = quad_from_line(start, head_start, thickness);
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draw_quad(flow, line_quad, color);
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}
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void draw_arrow_ray(struct gp_flow *flow, struct v2 pos, struct v2 rel, f32 thickness, f32 arrowhead_height, u32 color)
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{
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struct v2 end = v2_add(pos, rel);
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draw_arrow_line(flow, pos, end, thickness, arrowhead_height, color);
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}
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void draw_collider_line(struct gp_flow *flow, struct collider_shape shape, struct xform shape_xf, f32 thickness, u32 color, u32 detail)
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{
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struct arena_temp scratch = scratch_begin_no_conflict();
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struct v2_array poly = ZI;
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if (shape.radius == 0) {
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poly.count = shape.count;
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poly.points = arena_push_array_no_zero(scratch.arena, struct v2, shape.count);
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for (u32 i = 0; i < shape.count; ++i) {
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struct v2 p = xform_mul_v2(shape_xf, shape.points[i]);
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poly.points[i] = p;
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}
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} else {
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poly.count = detail;
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poly.points = arena_push_array_no_zero(scratch.arena, struct v2, detail);
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for (u32 i = 0; i < detail; ++i) {
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f32 angle = ((f32)i / (f32)detail) * TAU;
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struct v2 dir = V2(math_cos(angle), math_sin(angle));
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struct v2 p = collider_get_support_point(&shape, shape_xf, dir).p;
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poly.points[i] = p;
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}
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}
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draw_poly_line(flow, poly, true, thickness, color);
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scratch_end(scratch);
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}
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/* ========================== *
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* Grid
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* ========================== */
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void draw_grid(struct gp_flow *flow, struct xform xf, u32 bg0_color, u32 bg1_color, u32 line_color, u32 x_color, u32 y_color, f32 thickness, f32 spacing, struct v2 offset)
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{
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i32 grid_id = 0;
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{
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struct gp_cmd_desc cmd = ZI;
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cmd.kind = GP_CMD_KIND_PUSH_GRID;
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cmd.grid.bg0_color = bg0_color;
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cmd.grid.bg1_color = bg1_color;
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cmd.grid.line_color = line_color;
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cmd.grid.x_color = x_color;
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cmd.grid.y_color = y_color;
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cmd.grid.line_thickness = thickness;
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cmd.grid.line_spacing = spacing;
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cmd.grid.offset = offset;
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grid_id = gp_push_cmd(flow, &cmd);
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}
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struct gp_cmd_desc cmd = ZI;
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cmd.kind = GP_CMD_KIND_DRAW_MATERIAL;
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cmd.material.xf = xf;
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cmd.material.tint = COLOR_WHITE;
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cmd.material.grid_cmd_id = grid_id;
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gp_push_cmd(flow, &cmd);
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}
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/* ========================== *
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* Text
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* ========================== */
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/* Returns the rect of the text area */
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struct rect draw_text(struct gp_flow *flow, struct draw_text_params params)
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{
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__prof;
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struct arena_temp scratch = scratch_begin_no_conflict();
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f32 inv_font_image_width = 1.0 / (f32)params.font->image_width;
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f32 inv_font_image_height = 1.0 / (f32)params.font->image_height;
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f32 line_spacing = params.font->point_size * 1.5f * params.scale;
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/* ========================== *
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* Build line glyphs
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* ========================== */
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struct drawable_glyph {
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f32 off_x;
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f32 off_y;
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f32 width;
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f32 height;
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f32 advance;
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struct clip_rect clip;
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};
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struct drawable_line {
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f32 line_width;
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u32 num_glyphs;
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struct drawable_glyph *glyphs;
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struct drawable_line *next;
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};
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u64 num_lines = 0;
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f32 widest_line = 0;
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struct drawable_line *first_line = NULL;
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struct drawable_line *last_line = NULL;
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f32 first_line_top_offset = 0;
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f32 last_line_bottom_offset = 0;
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if (params.str.len > 0) {
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b32 string_done = false;
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struct string_codepoint_iter iter = string_codepoint_iter_begin(params.str);
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while (!string_done) {
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f32 line_width = 0;
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f32 top_offset = 0;
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f32 bottom_offset = 0;
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u64 num_line_glyphs = 0;
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struct drawable_glyph *line_glyphs = arena_push_dry(scratch.arena, struct drawable_glyph);
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b32 line_done = false;
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while (!line_done) {
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string_done = !string_codepoint_iter_next(&iter);
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if (string_done) {
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line_done = true;
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} else {
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u32 codepoint = iter.codepoint;
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if (codepoint == '\n') {
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line_done = true;
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} else {
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struct drawable_glyph *tg = arena_push(scratch.arena, struct drawable_glyph);
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++num_line_glyphs;
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struct font_glyph *glyph = font_get_glyph(params.font, codepoint);
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tg->off_x = glyph->off_x * params.scale;
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tg->off_y = glyph->off_y * params.scale;
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tg->width = glyph->width * params.scale;
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tg->height = glyph->height * params.scale;
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tg->advance = glyph->advance * params.scale;
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struct rect glyph_atlas_rect = glyph->atlas_rect;
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tg->clip = (struct clip_rect) {
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{
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glyph_atlas_rect.x * inv_font_image_width,
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glyph_atlas_rect.y * inv_font_image_height
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},
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{
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(glyph_atlas_rect.x + glyph_atlas_rect.width) * inv_font_image_width,
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(glyph_atlas_rect.y + glyph_atlas_rect.height) * inv_font_image_height
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}
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};
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line_width += tg->advance;
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top_offset = min_f32(top_offset, tg->off_y);
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bottom_offset = max_f32(bottom_offset, tg->off_y + tg->height);
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}
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}
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}
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/* Line ended */
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/* TODO: Only create nodes for non-empty lines. Embed line number in the node. */
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struct drawable_line *node = arena_push(scratch.arena, struct drawable_line);
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node->line_width = line_width;
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node->num_glyphs = num_line_glyphs;
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node->glyphs = line_glyphs;
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if (last_line) {
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last_line->next = node;
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} else {
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first_line = node;
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first_line_top_offset = top_offset;
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}
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last_line = node;
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last_line_bottom_offset = bottom_offset;
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widest_line = max_f32(widest_line, line_width);
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++num_lines;
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}
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string_codepoint_iter_end(&iter);
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}
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/* ========================== *
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* Determine text bounds
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* ========================== */
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struct rect bounds = ZI;
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bounds.x = params.pos.x;
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bounds.y = params.pos.y;
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bounds.width = widest_line;
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bounds.height = num_lines * line_spacing + first_line_top_offset + last_line_bottom_offset;
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/* Offset bounds X */
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switch (params.offset_x) {
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case DRAW_TEXT_OFFSET_X_LEFT: break;
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case DRAW_TEXT_OFFSET_X_CENTER:
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{
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bounds.x -= bounds.width / 2.f;
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} break;
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case DRAW_TEXT_OFFSET_X_RIGHT:
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{
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bounds.x -= bounds.width;
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} break;
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}
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/* Offset bounds Y */
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switch (params.offset_y) {
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case DRAW_TEXT_OFFSET_Y_TOP: break;
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case DRAW_TEXT_OFFSET_Y_CENTER:
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{
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bounds.y -= bounds.height / 2.f;
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} break;
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case DRAW_TEXT_OFFSET_Y_BOTTOM:
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{
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if (last_line) {
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bounds.y -= bounds.height + last_line_bottom_offset;
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}
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} break;
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}
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/* ========================== *
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* Draw lines
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* ========================== */
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u64 line_number = 0;
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for (struct drawable_line *line = first_line; line; line = line->next) {
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struct v2 draw_pos = bounds.pos;
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draw_pos.y += line_number * line_spacing - first_line_top_offset;
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/* Alignment */
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switch (params.alignment) {
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case DRAW_TEXT_ALIGNMENT_LEFT: break;
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case DRAW_TEXT_ALIGNMENT_CENTER:
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{
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draw_pos.x += (bounds.width - line->line_width) / 2.f;
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} break;
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case DRAW_TEXT_ALIGNMENT_RIGHT:
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{
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draw_pos.x += bounds.width - line->line_width;
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} break;
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}
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/* Draw glyphs */
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for (u64 i = 0; i < line->num_glyphs; ++i) {
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struct drawable_glyph *tg = &line->glyphs[i];
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struct v2 pos = V2(draw_pos.x + tg->off_x, draw_pos.y + tg->off_y);
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struct v2 size = V2(tg->width, tg->height);
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struct xform xf = xform_from_rect(RECT_FROM_V2(pos, size));
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draw_texture(flow, DRAW_TEXTURE_PARAMS(.xf = xf, .texture = params.font->texture, .tint = params.color, .clip = tg->clip));
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draw_pos.x += tg->advance;
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}
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++line_number;
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}
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scratch_end(scratch);
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return bounds;
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}
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