win32 drawing text

src/draw/gfx2d.c

@@ -0,0 +1,146 @@
+fn_wasm_import void wasm_clear(void);
+fn_wasm_import void wasm_draw_text(isize str, i32 len, f64 x, f64 y, isize font_str, i32 font_len, i32 font_size, f32 r, f32 g, f32 b, f32 a);
+fn_wasm_import void wasm_draw_rect(f64 x, f64 y, f64 w, f64 h, f32 r, f32 g, f32 b, f32 a);
+fn_wasm_import f64  wasm_measure_text(isize str, i32 len, isize font_str, i32 font_len, i32 font_size);
+fn_wasm_import f64  wasm_get_font_height(isize font_str, i32 font_len, i32 font_size);
+fn_wasm_import void wasm_set_clip(f64 x, f64 y, f64 w, f64 h);
+
+
+// gb_read_only s8_t font_face = s8_const_lit("open_sans_regular");
+gb_read_only s8_t font_face = s8_const_lit("consolas");
+
+fn void set_clip(r2f64_t rect) {
+    wasm_set_clip(wasm_dpr * rect.min.x, wasm_dpr * rect.min.y, wasm_dpr * (rect.max.x - rect.min.x), wasm_dpr * (rect.max.y - rect.min.y));
+}
+
+fn f64 get_font_height(void) {
+    return wasm_get_font_height((isize) font_face.str, font_face.len, 20*wasm_dpr) / wasm_dpr;
+}
+
+fn f64 measure_text_ex(s8_t string) {
+    return wasm_measure_text((isize)string.str, string.len, (isize) font_face.str, font_face.len, 20*wasm_dpr) / wasm_dpr;
+}
+
+fn f64 measure_text(char *str) {
+    return measure_text_ex(s8_from_char(str));
+}
+
+fn void draw_text(v2f64_t pos, v4f32_t color, s8_t string) {
+    wasm_draw_text((isize)string.str, string.len, wasm_dpr * pos.x, wasm_dpr * pos.y, (isize) font_face.str, font_face.len, 20*wasm_dpr, color.r * 255.f, color.g * 255.f, color.b * 255.f, color.a);
+}
+
+fn void draw_textf(v2f64_t pos, char *str, ...) {
+    char    buff[1024];
+    va_list args;
+    va_start(args, str);
+    i32 len = stbsp_vsnprintf(buff, sizeof(buff), str, args);
+    va_end(args);
+
+    wasm_draw_text((isize)buff, len, wasm_dpr * pos.x, wasm_dpr * pos.y, (isize) font_face.str, font_face.len, 20*wasm_dpr, 0, 0, 0, 1);
+}
+
+fn void draw_rect(r2f64_t rect, v4f32_t color) {
+    wasm_draw_rect(wasm_dpr * rect.min.x, wasm_dpr * rect.min.y, wasm_dpr * (rect.max.x - rect.min.x), wasm_dpr * (rect.max.y - rect.min.y), color.r * 255.f, color.g * 255.f, color.b * 255.f, color.a);
+}
+
+typedef enum {
+    gfx_kind_null,
+    gfx_kind_clear,
+    gfx_kind_draw_rect,
+    gfx_kind_draw_text,
+    gfx_kind_set_clip,
+} gfx_kind_t;
+
+typedef struct gfx_cmd_t gfx_cmd_t;
+struct gfx_cmd_t {
+    gfx_cmd_t *next;
+    gfx_kind_t kind;
+    r2f64_t      rect;
+    v4f32_t      color;
+    s8_t         text;
+};
+
+typedef struct gfx_t gfx_t;
+struct gfx_t {
+    gfx_cmd_t *first;
+    gfx_cmd_t *last;
+    app_event_t *ev;
+};
+
+// @todo:
+typedef struct gfx_group_t gfx_group_t;
+struct gfx_group_t {
+    gfx_cmd_t *first;
+    gfx_cmd_t *last;
+};
+
+void gfx_begin(gfx_t *gfx, app_event_t *ev) {
+    gfx->ev = ev;
+}
+
+void gfx_end(gfx_t *gfx) {
+    app_event_t *ev = gfx->ev;
+    r2f64_t window = (r2f64_t){0, 0, ev->window_size.x, ev->window_size.y};
+    for (gfx_cmd_t *cmd = gfx->first; cmd; cmd = cmd->next) {
+        if (cmd->kind == gfx_kind_clear) {
+            wasm_clear();
+            draw_rect(window, cmd->color);
+        } else if (cmd->kind == gfx_kind_draw_rect) {
+            draw_rect(cmd->rect, cmd->color);
+        } else if (cmd->kind == gfx_kind_draw_text) {
+            draw_text(cmd->rect.min, cmd->color, cmd->text);
+        } else if (cmd->kind == gfx_kind_set_clip) {
+            set_clip(cmd->rect);
+        } else {
+            invalid_codepath;
+        }
+    }
+
+    gfx->first = gfx->last = NULL;
+}
+
+void gfx_add_cmd(gfx_t *gfx, gfx_cmd_t cmd) {
+    gfx_cmd_t *c = ma_push_type(tcx.temp, gfx_cmd_t);
+    *c = cmd;
+    SLLQ_APPEND(gfx->first, gfx->last, c);
+}
+
+void gfx_clear(gfx_t *gfx, v4f32_t color) {
+    gfx_add_cmd(gfx, (gfx_cmd_t){
+        .kind = gfx_kind_clear,
+        .color = color,
+    });
+}
+
+void gfx_rect(gfx_t *gfx, r2f64_t rect, v4f32_t color) {
+    gfx_add_cmd(gfx, (gfx_cmd_t){
+        .kind = gfx_kind_draw_rect,
+        .color = color,
+        .rect = rect,
+    });
+}
+
+void gfx_set_clip(gfx_t *gfx, r2f64_t rect) {
+    gfx_add_cmd(gfx, (gfx_cmd_t){
+        .kind = gfx_kind_set_clip,
+        .rect = rect,
+    });
+}
+
+void gfx_text(gfx_t *gfx, v2f64_t pos, v4f32_t color, s8_t string) {
+    gfx_add_cmd(gfx, (gfx_cmd_t){
+        .kind = gfx_kind_draw_text,
+        .text = s8_copy(tcx.temp, string),
+        .color = color,
+        .rect.min = pos,
+    });
+}
+void gfx_textf(gfx_t *gfx, v2f64_t pos, v4f32_t color, char *str, ...) {
+    S8_FMT(tcx.temp, str, text);
+    gfx_add_cmd(gfx, (gfx_cmd_t){
+        .kind = gfx_kind_draw_text,
+        .text = text,
+        .color = color,
+        .rect.min = pos,
+    });
+}