From d3b45f38845167151e87c530b9d5ef72077a5166 Mon Sep 17 00:00:00 2001 From: b0xcat Date: Tue, 5 May 2026 22:08:08 +0200 Subject: [PATCH 4/5] Add option for ctx cb mode to save memory (~100kb saved by not having a full framebuffer) --- drivers/gc9a01/display.c | 100 +++++++++++++++++++++++++++++---------- 1 file changed, 75 insertions(+), 25 deletions(-) diff --git a/drivers/gc9a01/display.c b/drivers/gc9a01/display.c index 3062800..2bf3c93 100644 --- a/drivers/gc9a01/display.c +++ b/drivers/gc9a01/display.c @@ -30,38 +30,62 @@ static MP_DEFINE_CONST_FUN_OBJ_0(get_fps_obj, get_fps); #define TILDAGON_DISPLAY_WIDTH 240 #define TILDAGON_DISPLAY_HEIGHT 240 -EXT_RAM_BSS_ATTR -static uint8_t tildagon_fb[TILDAGON_DISPLAY_WIDTH * TILDAGON_DISPLAY_HEIGHT * 2]; static Ctx *tildagon_ctx = NULL; +// #define TILDAGON_CTX_CB_MODE + +#ifdef TILDAGON_CTX_CB_MODE + +#define TILDAGON_SCRATCH_ROWS 32 + +// EXT_RAM_BSS_ATTR +static uint8_t tildagon_scratch[TILDAGON_DISPLAY_WIDTH * TILDAGON_SCRATCH_ROWS * 2]; + +static void tildagon_set_pixels(Ctx *ctx, void *user_data, + int x, int y, int w, int h, void *buf) { + flow3r_bsp_display_send_rect(buf, x, y, w, h); +} + Ctx *tildagon_gfx_ctx(void) { if (tildagon_ctx == NULL) { - tildagon_ctx = ctx_new_for_framebuffer (tildagon_fb, TILDAGON_DISPLAY_WIDTH, TILDAGON_DISPLAY_HEIGHT, TILDAGON_DISPLAY_WIDTH * 2, CTX_FORMAT_RGB565_BYTESWAPPED); + tildagon_ctx = ctx_new_cb(TILDAGON_DISPLAY_WIDTH, TILDAGON_DISPLAY_HEIGHT, + CTX_FORMAT_RGB565_BYTESWAPPED, + tildagon_set_pixels, NULL, + NULL, NULL, + sizeof(tildagon_scratch), + tildagon_scratch, + CTX_FLAG_HASH_CACHE); } return tildagon_ctx; } -void tildagon_start_frame(Ctx *ctx) +void tildagon_end_frame(Ctx *ctx) { - int32_t offset_x = FLOW3R_BSP_DISPLAY_WIDTH / 2; - int32_t offset_y = FLOW3R_BSP_DISPLAY_HEIGHT / 2; - - ctx_save (ctx); - ctx_identity (ctx); - ctx_apply_transform (ctx, 1.0f, 0.0f, offset_x, 0.0f, 1.0f, offset_y, 0.0f, 0.0f, 1.0f); + ctx_restore (ctx); + ctx_end_frame (ctx); + st3m_gfx_fps_update (); } -static mp_obj_t get_ctx() { - Ctx *ctx = tildagon_gfx_ctx(); - assert (ctx); - tildagon_start_frame (ctx); - return mp_ctx_from_ctx(ctx); +#else /* framebuffer mode */ + +EXT_RAM_BSS_ATTR +static uint8_t tildagon_fb[TILDAGON_DISPLAY_WIDTH * TILDAGON_DISPLAY_HEIGHT * 2]; + +Ctx *tildagon_gfx_ctx(void) +{ + if (tildagon_ctx == NULL) + { + tildagon_ctx = ctx_new_for_framebuffer(tildagon_fb, + TILDAGON_DISPLAY_WIDTH, TILDAGON_DISPLAY_HEIGHT, + TILDAGON_DISPLAY_WIDTH * 2, + CTX_FORMAT_RGB565_BYTESWAPPED); + } + return tildagon_ctx; } -static MP_DEFINE_CONST_FUN_OBJ_0(get_ctx_obj, get_ctx); -void tildagon_blit_fb (void) +static void tildagon_blit_fb(void) { flow3r_bsp_display_send_fb(tildagon_fb, 16); } @@ -88,6 +112,32 @@ void tildagon_end_frame(Ctx *ctx) st3m_gfx_fps_update (); } +#endif /* TILDAGON_CTX_CB_MODE */ + +void tildagon_start_frame(Ctx *ctx) +{ + int32_t offset_x = FLOW3R_BSP_DISPLAY_WIDTH / 2; + int32_t offset_y = FLOW3R_BSP_DISPLAY_HEIGHT / 2; + + ctx_save (ctx); +#ifndef TILDAGON_CTX_CB_MODE + // In framebuffer mode, identity resets any leftover state since + // ctx_end_frame() is never called. In cb mode ctx_end_frame() resets + // the state and the identity would override the tile offset that the + // cb backend applies via ctx_translate before replaying the drawlist. + ctx_identity (ctx); +#endif + ctx_apply_transform (ctx, 1.0f, 0.0f, offset_x, 0.0f, 1.0f, offset_y, 0.0f, 0.0f, 1.0f); +} + +static mp_obj_t get_ctx() { + Ctx *ctx = tildagon_gfx_ctx(); + assert (ctx); + tildagon_start_frame (ctx); + return mp_ctx_from_ctx(ctx); +} +static MP_DEFINE_CONST_FUN_OBJ_0(get_ctx_obj, get_ctx); + static mp_obj_t end_frame(mp_obj_t ctx) { mp_ctx_obj_t *self = MP_OBJ_TO_PTR(ctx); tildagon_end_frame (self->ctx); @@ -109,25 +159,25 @@ static mp_obj_t hexagon(size_t n_args, const mp_obj_t *args) { float x = mp_obj_get_float(args[1]); float y = mp_obj_get_float(args[2]); float dim = mp_obj_get_float(args[3]); - + // All the internal angles are 120 degrees, or 2/3 pi radians // This translates to either an offset of (1, 0) or the pair below float minor_component = cos(M_PI / 3); float major_component = sin(M_PI / 3); - + // Stash the caller's axes ctx_save(ctx->ctx); - + // Set the origin to the centre of the hexagon and scale to the size ctx_translate (ctx->ctx, x, y); ctx_scale (ctx->ctx, dim, dim); - + // Rotate so point is at the top - the drawing code has the flat side at the top ctx_rotate(ctx->ctx, M_PI / 2.0f); - + // Move to the start of the top left line ctx_move_to(ctx->ctx, -minor_component, -major_component); - + // Draw the six segments ctx_rel_line_to(ctx->ctx, 1.0f, 0.0f); ctx_rel_line_to(ctx->ctx, minor_component, major_component); @@ -135,10 +185,10 @@ static mp_obj_t hexagon(size_t n_args, const mp_obj_t *args) { ctx_rel_line_to(ctx->ctx, -1.0f, 0.0f); ctx_rel_line_to(ctx->ctx, -minor_component, -major_component); ctx_rel_line_to(ctx->ctx, minor_component, -major_component); - + // Fill the hexagon ctx_fill(ctx->ctx); - + // Restore the axes ctx_restore(ctx->ctx); -- 2.53.0