2 files changed, 197 insertions, 0 deletions
diff --git a/drivers/painter/tft_panel/qp_tft_panel.c b/drivers/painter/tft_panel/qp_tft_panel.c
new file mode 100644
index 0000000000..4d636c9509
--- /dev/null
+++ b/drivers/painter/tft_panel/qp_tft_panel.c
@@ -0,0 +1,130 @@
+// Copyright 2021 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "color.h"
+#include "qp_internal.h"
+#include "qp_comms.h"
+#include "qp_draw.h"
+#include "qp_tft_panel.h"
+
+#define BYTE_SWAP(x) (((((uint16_t)(x)) >> 8) & 0x00FF) | ((((uint16_t)(x)) << 8) & 0xFF00))
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Native pixel format conversion
+
+uint16_t qp_rgb888_to_rgb565(uint8_t r, uint8_t g, uint8_t b) {
+    uint16_t rgb565 = (((uint16_t)r) >> 3) << 11 | (((uint16_t)g) >> 2) << 5 | (((uint16_t)b) >> 3);
+    return rgb565;
+}
+
+uint16_t qp_rgb888_to_rgb565_swapped(uint8_t r, uint8_t g, uint8_t b) {
+    uint16_t rgb565 = (((uint16_t)r) >> 3) << 11 | (((uint16_t)g) >> 2) << 5 | (((uint16_t)b) >> 3);
+    return BYTE_SWAP(rgb565);
+}
+
+uint16_t qp_rgb888_to_bgr565(uint8_t r, uint8_t g, uint8_t b) {
+    uint16_t bgr565 = (((uint16_t)b) >> 3) << 11 | (((uint16_t)g) >> 2) << 5 | (((uint16_t)r) >> 3);
+    return bgr565;
+}
+
+uint16_t qp_rgb888_to_bgr565_swapped(uint8_t r, uint8_t g, uint8_t b) {
+    uint16_t bgr565 = (((uint16_t)b) >> 3) << 11 | (((uint16_t)g) >> 2) << 5 | (((uint16_t)r) >> 3);
+    return BYTE_SWAP(bgr565);
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Quantum Painter API implementations
+
+// Power control
+bool qp_tft_panel_power(painter_device_t device, bool power_on) {
+    struct painter_driver_t *                          driver = (struct painter_driver_t *)device;
+    struct tft_panel_dc_reset_painter_driver_vtable_t *vtable = (struct tft_panel_dc_reset_painter_driver_vtable_t *)driver->driver_vtable;
+    qp_comms_command(device, power_on ? vtable->opcodes.display_on : vtable->opcodes.display_off);
+    return true;
+}
+
+// Screen clear
+bool qp_tft_panel_clear(painter_device_t device) {
+    struct painter_driver_t *driver = (struct painter_driver_t *)device;
+    driver->driver_vtable->init(device, driver->rotation); // Re-init the LCD
+    return true;
+}
+
+// Screen flush
+bool qp_tft_panel_flush(painter_device_t device) {
+    // No-op, as there's no framebuffer in RAM for this device.
+    return true;
+}
+
+// Viewport to draw to
+bool qp_tft_panel_viewport(painter_device_t device, uint16_t left, uint16_t top, uint16_t right, uint16_t bottom) {
+    struct painter_driver_t *                          driver = (struct painter_driver_t *)device;
+    struct tft_panel_dc_reset_painter_driver_vtable_t *vtable = (struct tft_panel_dc_reset_painter_driver_vtable_t *)driver->driver_vtable;
+
+    // Fix up the drawing location if required
+    left += driver->offset_x;
+    right += driver->offset_x;
+    top += driver->offset_y;
+    bottom += driver->offset_y;
+
+    // Check if we need to manually swap the window coordinates based on whether or not we're in a sideways rotation
+    if (vtable->swap_window_coords && (driver->rotation == QP_ROTATION_90 || driver->rotation == QP_ROTATION_270)) {
+        uint16_t temp;
+
+        temp = left;
+        left = top;
+        top  = temp;
+
+        temp   = right;
+        right  = bottom;
+        bottom = temp;
+    }
+
+    if (vtable->num_window_bytes == 1) {
+        // Set up the x-window
+        uint8_t xbuf[2] = {left & 0xFF, right & 0xFF};
+        qp_comms_command_databuf(device, vtable->opcodes.set_column_address, xbuf, sizeof(xbuf));
+
+        // Set up the y-window
+        uint8_t ybuf[2] = {top & 0xFF, bottom & 0xFF};
+        qp_comms_command_databuf(device, vtable->opcodes.set_row_address, ybuf, sizeof(ybuf));
+    } else if (vtable->num_window_bytes == 2) {
+        // Set up the x-window
+        uint8_t xbuf[4] = {left >> 8, left & 0xFF, right >> 8, right & 0xFF};
+        qp_comms_command_databuf(device, vtable->opcodes.set_column_address, xbuf, sizeof(xbuf));
+
+        // Set up the y-window
+        uint8_t ybuf[4] = {top >> 8, top & 0xFF, bottom >> 8, bottom & 0xFF};
+        qp_comms_command_databuf(device, vtable->opcodes.set_row_address, ybuf, sizeof(ybuf));
+    }
+
+    // Lock in the window
+    qp_comms_command(device, vtable->opcodes.enable_writes);
+    return true;
+}
+
+// Stream pixel data to the current write position in GRAM
+bool qp_tft_panel_pixdata(painter_device_t device, const void *pixel_data, uint32_t native_pixel_count) {
+    qp_comms_send(device, pixel_data, native_pixel_count * sizeof(uint16_t));
+    return true;
+}
+
+// Convert supplied palette entries into their native equivalents
+bool qp_tft_panel_palette_convert(painter_device_t device, int16_t palette_size, qp_pixel_t *palette) {
+    struct painter_driver_t *                          driver = (struct painter_driver_t *)device;
+    struct tft_panel_dc_reset_painter_driver_vtable_t *vtable = (struct tft_panel_dc_reset_painter_driver_vtable_t *)driver->driver_vtable;
+    for (int16_t i = 0; i < palette_size; ++i) {
+        RGB rgb           = hsv_to_rgb_nocie((HSV){palette[i].hsv888.h, palette[i].hsv888.s, palette[i].hsv888.v});
+        palette[i].rgb565 = vtable->rgb888_to_native16bit(rgb.r, rgb.g, rgb.b);
+    }
+    return true;
+}
+
+// Append pixels to the target location, keyed by the pixel index
+bool qp_tft_panel_append_pixels(painter_device_t device, uint8_t *target_buffer, qp_pixel_t *palette, uint32_t pixel_offset, uint32_t pixel_count, uint8_t *palette_indices) {
+    uint16_t *buf = (uint16_t *)target_buffer;
+    for (uint32_t i = 0; i < pixel_count; ++i) {
+        buf[pixel_offset + i] = palette[palette_indices[i]].rgb565;
+    }
+    return true;
+}
diff --git a/drivers/painter/tft_panel/qp_tft_panel.h b/drivers/painter/tft_panel/qp_tft_panel.h
new file mode 100644
index 0000000000..6eddfc503d
--- /dev/null
+++ b/drivers/painter/tft_panel/qp_tft_panel.h
@@ -0,0 +1,67 @@
+// Copyright 2021 Nick Brassel (@tzarc)
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "color.h"
+#include "qp_internal.h"
+
+#ifdef QUANTUM_PAINTER_SPI_ENABLE
+#    include "qp_comms_spi.h"
+#endif // QUANTUM_PAINTER_SPI_ENABLE
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Common TFT panel implementation using D/C, and RST pins.
+
+typedef uint16_t (*rgb888_to_native_uint16_t)(uint8_t r, uint8_t g, uint8_t b);
+
+// Driver vtable with extras
+struct tft_panel_dc_reset_painter_driver_vtable_t {
+    struct painter_driver_vtable_t base; // must be first, so it can be cast to/from the painter_driver_vtable_t* type
+
+    // Conversion function for palette entries
+    rgb888_to_native_uint16_t rgb888_to_native16bit;
+
+    // Number of bytes for transmitting x/y coordinates
+    uint8_t num_window_bytes;
+
+    // Whether or not the x/y coords should be swapped on 90/270 rotation
+    bool swap_window_coords;
+
+    // Opcodes for normal display operation
+    struct {
+        uint8_t display_on;
+        uint8_t display_off;
+        uint8_t set_column_address;
+        uint8_t set_row_address;
+        uint8_t enable_writes;
+    } opcodes;
+};
+
+// Device definition
+typedef struct tft_panel_dc_reset_painter_device_t {
+    struct painter_driver_t base; // must be first, so it can be cast to/from the painter_device_t* type
+
+    union {
+#ifdef QUANTUM_PAINTER_SPI_ENABLE
+        // SPI-based configurables
+        struct qp_comms_spi_dc_reset_config_t spi_dc_reset_config;
+#endif // QUANTUM_PAINTER_SPI_ENABLE
+
+        // TODO: I2C/parallel etc.
+    };
+} tft_panel_dc_reset_painter_device_t;
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Forward declarations for injecting into concrete driver vtables
+
+bool qp_tft_panel_power(painter_device_t device, bool power_on);
+bool qp_tft_panel_clear(painter_device_t device);
+bool qp_tft_panel_flush(painter_device_t device);
+bool qp_tft_panel_viewport(painter_device_t device, uint16_t left, uint16_t top, uint16_t right, uint16_t bottom);
+bool qp_tft_panel_pixdata(painter_device_t device, const void *pixel_data, uint32_t native_pixel_count);
+bool qp_tft_panel_palette_convert(painter_device_t device, int16_t palette_size, qp_pixel_t *palette);
+bool qp_tft_panel_append_pixels(painter_device_t device, uint8_t *target_buffer, qp_pixel_t *palette, uint32_t pixel_offset, uint32_t pixel_count, uint8_t *palette_indices);
+
+uint16_t qp_rgb888_to_rgb565(uint8_t r, uint8_t g, uint8_t b);
+uint16_t qp_rgb888_to_rgb565_swapped(uint8_t r, uint8_t g, uint8_t b);
+uint16_t qp_rgb888_to_bgr565(uint8_t r, uint8_t g, uint8_t b);
+uint16_t qp_rgb888_to_bgr565_swapped(uint8_t r, uint8_t g, uint8_t b);