104 lines
2.8 KiB
C
104 lines
2.8 KiB
C
/*
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* Copyright (c) 2024 Scott Duensing, scott@kangaroopunch.com
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "graphics.h"
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void graphicsDefineColor(byte clut, byte slot, byte r, byte g, byte b) {
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byte mmu = PEEK(MMU_IO_CTRL); // Get current MMU state.
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byte *write;
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uint16_t gclut;
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switch (clut) {
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case 0:
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gclut = VKY_GR_CLUT_0;
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break;
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case 1:
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gclut = VKY_GR_CLUT_1;
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break;
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case 2:
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gclut = VKY_GR_CLUT_2;
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break;
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case 3:
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gclut = VKY_GR_CLUT_3;
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break;
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}
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POKE(MMU_IO_CTRL, MMU_IO_PAGE_1); // Swap I/O page 1 into bank 6.
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// This doesn't work for some reason.
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//write = (byte *)mathUnsignedAddition((uint32_t)gclut, mathUnsignedMultiply((uint16_t)slot, (uint16_t)4));
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write = (byte *)gclut + (slot * 4);
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*write++ = b;
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*write++ = g;
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*write++ = r;
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*write++ = 0xff;
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POKE(MMU_IO_CTRL, mmu); // Restore MMU state.
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}
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void graphicsReset() {
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int16_t x;
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byte y;
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// Set palettes to a gradient so there's at least *something*.
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for (y=0; y<4; y++) {
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for (x=0; x<256; x++) {
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graphicsDefineColor(y, x, x, x, x);
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}
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}
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graphicsSetLayerBitmap(0, 0);
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graphicsSetLayerBitmap(1, 1);
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graphicsSetLayerBitmap(2, 2);
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}
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void graphicsSetLayerBitmap(byte layer, byte which) {
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switch (layer) {
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case 0:
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POKE(VKY_LAYER_CTRL_0, (PEEK(VKY_LAYER_CTRL_0) & 0xf0) | which);
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break;
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case 1:
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POKE(VKY_LAYER_CTRL_0, (PEEK(VKY_LAYER_CTRL_0) & 0x0f) | (which << 4));
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break;
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case 2:
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POKE(VKY_LAYER_CTRL_1, which); //***TODO*** This doesn't work?
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break;
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}
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}
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void graphicsSetLayerTile(byte layer, byte which) {
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graphicsSetLayerBitmap(layer, which + 4);
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}
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void graphicsWaitVerticalBlank(void) {
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//***TODO*** This assumes we're 60hz with graphics enabled.
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while (PEEKW(RAST_ROW_L) != 482)
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// Spin our wheels.
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;
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}
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