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Moved DMA to separate function. Adde 1/2 to better round division result.

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This commit is contained in:
jespergravgaard 2021-04-03 20:51:59 +02:00
parent 1c9fa962d3
commit 9c9a99e2ac
1 changed files with 58 additions and 83 deletions
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141
src/test/kc/examples/mega65/linedrawing.c
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@ -40,12 +40,12 @@ void lpoke(__zp unsigned long addr, char val) {
// Graphics mode is 1 byte per pixel. Addressing is based on columns of 8px * 200px arranged to have linear addressing.
// addr = (x/8) * 64 * 25 + (y*8) + (x&7)
char line_dma_command[] = {
DMA_OPTION_LINE_XSTEP_LO, (25*64 - 8) & 0xff, // Line X step bytes 64x25
DMA_OPTION_LINE_XSTEP_HI, (25*64 - 8) >> 8, // Line X step bytes 64x25
DMA_OPTION_LINE_XSTEP_LO, LOBYTE(25*64 - 8), // Line X step bytes 64x25
DMA_OPTION_LINE_XSTEP_HI, HIBYTE(25*64 - 8), // Line X step bytes 64x25
DMA_OPTION_LINE_SLOPE_LO, 0, // Line Slope
DMA_OPTION_LINE_SLOPE_HI, 0, // Line Slope
DMA_OPTION_LINE_SLOPE_INIT_LO, 0, // Line slope init
DMA_OPTION_LINE_SLOPE_INIT_HI, 0, // Line slope init
DMA_OPTION_LINE_SLOPE_INIT_LO, LOBYTE(32768), // Line slope init
DMA_OPTION_LINE_SLOPE_INIT_HI, HIBYTE(32768), // Line slope init
DMA_OPTION_LINE_MODE, 0, // Line Mode
DMA_OPTION_FORMAT_F018A, // F018A list format
DMA_OPTION_END, // end of options
@ -60,8 +60,6 @@ char line_dma_command[] = {
// Offset of the DMA line SLOPE
const char LINE_DMA_COMMAND_SLOPE_OFFSET = 5;
// Offset of the DMA line SLOPE init
const char LINE_DMA_COMMAND_SLOPE_INIT_OFFSET = 9;
// Offset of the DMA line MODE
const char LINE_DMA_COMMAND_MODE_OFFSET = 13;
// Offset of the DMA count
@ -71,6 +69,35 @@ const char LINE_DMA_COMMAND_SRC_OFFSET = 19;
// Offset of the DMA destination
const char LINE_DMA_COMMAND_DEST_OFFSET = 22;
void line_dma_execute(unsigned long addr, unsigned int slope, unsigned int count, char colour, char is_direction_y, char is_slope_negative) {
// Put slope into DMA options
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET] = LOBYTE(slope);
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET + 2] = HIBYTE(slope);
// Load DMA dest address with the address of the first pixel
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 0] = BYTE0(addr);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 1] = BYTE1(addr);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 2] = BYTE2(addr);
// Source is the colour
line_dma_command[LINE_DMA_COMMAND_SRC_OFFSET] = colour;
// Count is number of pixels, i.e., dy.
line_dma_command[LINE_DMA_COMMAND_COUNT_OFFSET] = LOBYTE(count);
line_dma_command[LINE_DMA_COMMAND_COUNT_OFFSET + 1] = HIBYTE(count);
// Line mode active, major axis is Y
line_dma_command[LINE_DMA_COMMAND_MODE_OFFSET] = DMA_OPTION_LINE_MODE_ENABLE + (is_direction_y ? DMA_OPTION_LINE_MODE_DIRECTION_Y : 0x00) + (is_slope_negative ? DMA_OPTION_LINE_MODE_SLOPE_NEGATIVE : 0x00);
// Set address of DMA list
DMA->ADDRMB = 0;
DMA->ADDRBANK = 0;
DMA-> ADDRMSB = HIBYTE(line_dma_command);
// Trigger the DMA (with option lists)
DMA-> ETRIG = LOBYTE(line_dma_command);
}
void main() {
// Avoid interrupts
@ -189,54 +216,28 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour) {
y2 = temp;
}
// Use hardware divider to get the slope
*MATH_MULTINA_INT0 = dx;
*MATH_MULTINB_INT0 = dy;
// Use hardware divider to get the slope (add 1/2 to get better rounding )
*MATH_MULTINA_INT0 = dx*2+1;
*MATH_MULTINB_INT0 = dy*2;
*MATH_MULTINA_INT1 = 0;
*MATH_MULTINB_INT1 = 0;
// Wait 16 cycles
VICIV->BORDER_COLOR = 0;
VICIV->BORDER_COLOR = 0;
VICIV->BORDER_COLOR = 0;
VICIV->BORDER_COLOR = 0;
asm {
lda MATH_DIVOUT_FRAC_INT1 @nooptimize
lda MATH_DIVOUT_FRAC_INT1 @nooptimize
lda MATH_DIVOUT_FRAC_INT1 @nooptimize
lda MATH_DIVOUT_FRAC_INT1 @nooptimize
}
// Slope is the most significant bytes of the fractional part
// of the division result
unsigned int slope = (unsigned int)*MATH_DIVOUT_FRAC_INT1;
// Put slope into DMA options
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET] = LOBYTE(slope);
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET + 2] = HIBYTE(slope);
// Put slope init into DMA options
unsigned int slope_init = 32768;
line_dma_command[LINE_DMA_COMMAND_SLOPE_INIT_OFFSET] = LOBYTE(slope_init);
line_dma_command[LINE_DMA_COMMAND_SLOPE_INIT_OFFSET + 2] = HIBYTE(slope_init);
// Load DMA dest address with the address of the first pixel
unsigned long addr = GRAPHICS + (unsigned int)(x1/8) * 64 * 25 + (unsigned int)(y1*8) + (unsigned char)(x1&7);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 0] = BYTE0(addr);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 1] = BYTE1(addr);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 2] = BYTE2(addr);
// Source is the colour
line_dma_command[LINE_DMA_COMMAND_SRC_OFFSET] = colour;
// Count is number of pixels, i.e., dy.
line_dma_command[LINE_DMA_COMMAND_COUNT_OFFSET] = LOBYTE(dy);
line_dma_command[LINE_DMA_COMMAND_COUNT_OFFSET + 1] = HIBYTE(dy);
// Line mode active, major axis is Y
line_dma_command[LINE_DMA_COMMAND_MODE_OFFSET] = DMA_OPTION_LINE_MODE_ENABLE + DMA_OPTION_LINE_MODE_DIRECTION_Y + (((x2 - x1) < 0) ? DMA_OPTION_LINE_MODE_SLOPE_NEGATIVE : 0x00);
// Set address of DMA list
DMA->ADDRMB = 0;
DMA->ADDRBANK = 0;
DMA-> ADDRMSB = >line_dma_command;
// Trigger the DMA (with option lists)
DMA-> ETRIG = <line_dma_command;
}
else {
unsigned int count = (unsigned int)dy;
char is_slope_negative = ((x2 - x1) < 0)?1:0;
line_dma_execute(addr, slope, count, colour, 1, is_slope_negative);
} else {
// X is major axis
if (x2 < x1) {
@ -248,52 +249,26 @@ void draw_line(int x1, int y1, int x2, int y2, unsigned char colour) {
y2 = temp;
}
// Use hardware divider to get the slope
*MATH_MULTINA_INT0 = dy;
*MATH_MULTINB_INT0 = dx;
// Use hardware divider to get the slope (add 1/2 to get better rounding )
*MATH_MULTINA_INT0 = dy*2+1;
*MATH_MULTINB_INT0 = dx*2;
*MATH_MULTINA_INT1 = 0;
*MATH_MULTINB_INT1 = 0;
// Wait 16 cycles
VICIV->BORDER_COLOR = 0;
VICIV->BORDER_COLOR = 0;
VICIV->BORDER_COLOR = 0;
VICIV->BORDER_COLOR = 0;
asm {
lda MATH_DIVOUT_FRAC_INT1 @nooptimize
lda MATH_DIVOUT_FRAC_INT1 @nooptimize
lda MATH_DIVOUT_FRAC_INT1 @nooptimize
lda MATH_DIVOUT_FRAC_INT1 @nooptimize
}
// Slope is the most significant bytes of the fractional part of the division result
unsigned int slope = (unsigned int)*MATH_DIVOUT_FRAC_INT1;
// Put slope into DMA options
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET] = LOBYTE(slope);
line_dma_command[LINE_DMA_COMMAND_SLOPE_OFFSET + 2] = HIBYTE(slope);
// Put slope init into DMA options
unsigned int slope_init = 32768;
line_dma_command[LINE_DMA_COMMAND_SLOPE_INIT_OFFSET] = LOBYTE(slope_init);
line_dma_command[LINE_DMA_COMMAND_SLOPE_INIT_OFFSET + 2] = HIBYTE(slope_init);
// Load DMA dest address with the address of the first pixel
unsigned long addr = GRAPHICS + (unsigned int)(x1/8) * 64 * 25 + (unsigned int)(y1*8) + (unsigned char)(x1&7);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 0] = BYTE0(addr);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 1] = BYTE1(addr);
line_dma_command[LINE_DMA_COMMAND_DEST_OFFSET + 2] = BYTE2(addr);
// Source is the colour
line_dma_command[LINE_DMA_COMMAND_SRC_OFFSET] = colour;
// Count is number of pixels, i.e., dy.
line_dma_command[LINE_DMA_COMMAND_COUNT_OFFSET] = LOBYTE(dx);
line_dma_command[LINE_DMA_COMMAND_COUNT_OFFSET + 1] = HIBYTE(dx);
// Line mode active, major axis is X
line_dma_command[LINE_DMA_COMMAND_MODE_OFFSET] = DMA_OPTION_LINE_MODE_ENABLE + (((y2 - y1) < 0) ? DMA_OPTION_LINE_MODE_SLOPE_NEGATIVE : 0x00);
// Set address of DMA list
DMA->ADDRMB = 0;
DMA->ADDRBANK = 0;
DMA-> ADDRMSB = >line_dma_command;
// Trigger the DMA (with option lists)
DMA-> ETRIG = <line_dma_command;
unsigned int count = (unsigned int)dx;
char is_slope_negative = ((y2 - y1) < 0) ? 1 : 0;
line_dma_execute(addr, slope, count, colour, 0, is_slope_negative);
}
}