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DV Display: Ability to specify sprite blend mode

This commit is contained in:
Mike Bell 2023-07-12 22:01:03 +01:00 committed by Phil Howard
parent 103228a88d
commit 3cdfe558e8
3 changed files with 14 additions and 6 deletions
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4
drivers/dv_display/dv_display.cpp
View File

@ -459,10 +459,10 @@ namespace pimoroni {
define_sprite_internal(sprite_data_idx, width, height, (uint32_t*)data);
}
void DVDisplay::set_sprite(int sprite_num, uint16_t sprite_data_idx, const Point &p)
void DVDisplay::set_sprite(int sprite_num, uint16_t sprite_data_idx, const Point &p, SpriteBlendMode blend_mode)
{
uint8_t buf[7];
buf[0] = 1; // BLEND_DEPTH
buf[0] = (uint8_t)blend_mode;
buf[1] = sprite_data_idx & 0xff;
buf[2] = sprite_data_idx >> 8;
buf[3] = p.x & 0xff;

12
drivers/dv_display/dv_display.hpp
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@ -25,6 +25,15 @@ namespace pimoroni {
MODE_RGB888 = 3,
};
enum SpriteBlendMode : uint8_t {
BLEND_NONE = 0, // Sprite data always written to frame regardless of alpha
BLEND_DEPTH = 1, // Alpha represents depth. Order from back to front is: Sprite A0, Frame A0, Sprite A1, Frame A1
BLEND_DEPTH2 = 2, // Alpha represents depth. Order from back to front is: Sprite A0, Frame A0, Frame A1, Sprite A1
// Note that blend modes are only supported in RGB555 mode.
BLEND_BLEND = 3, // Use frame if Sprite A0 or Frame A1, additive blend if Sprite A1 and Frame A0
BLEND_BLEND2 = 4, // Use frame if Sprite A0, additive blend if Sprite A1
};
// I2C pins
static constexpr uint I2C_SDA = 6;
static constexpr uint I2C_SCL = 7;
@ -150,8 +159,7 @@ namespace pimoroni {
// Display/move a sprite to a given position.
// Note sprite positions are always display relative (not scrolled)
// TODO: Blend mode
void set_sprite(int sprite_num, uint16_t sprite_data_idx, const Point &p);
void set_sprite(int sprite_num, uint16_t sprite_data_idx, const Point &p, SpriteBlendMode blend_mode = BLEND_DEPTH);
void clear_sprite(int sprite_num);
// 32 colour palette mode. Note that palette entries range from 0-31,

4
examples/dv_stick/dv_sprite_test.cpp
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@ -18,7 +18,7 @@ using namespace pimoroni;
#define SPRITE_WIDTH 8
#define SPRITE_HEIGHT 8
#define USE_PALETTE 1
#define USE_PALETTE 0
#if USE_PALETTE
static uint8_t sprite_data_pal[] = {
@ -104,7 +104,7 @@ int main() {
while (true)
{
for (int i = 0; i < 32; ++i) {
display.set_sprite(i, 0, sprite_pos[i]);
display.set_sprite(i, 0, sprite_pos[i], (i < 16) ? DVDisplay::BLEND_BLEND : DVDisplay::BLEND_DEPTH);
sprite_pos[i] += sprite_dir[i];
if (sprite_pos[i].x >= DISPLAY_WIDTH || sprite_pos[i].x <= 0) {