pixel_test.c File Reference

pico9918-core - the post-palette pixel path More...

#include "impl/pico9918_priv.h"
#include "pico9918_frame.h"
#include <stdio.h>
#include <string.h>

Include dependency graph for pixel_test.c:

Go to the source code of this file.

Macros
#define	H_VIRTUAL   640u
#define	H_BORDER   ((H_VIRTUAL - TMS9918_PIXELS_X * 2u) / 2u) /* 64 pixels each side */
#define	SENTINEL   0xbeefu

Functions
static void	fail (const char *what, unsigned where, unsigned wanted, unsigned got)
static void	regWrite (uint8_t reg, uint8_t value)
static void	unlock (void)
static void	distinctPalette (void)
static uint16_t	want (int index)
static void	renderLines (uint16_t from, uint16_t to)
static uint16_t	activeLine (void)
static void	renderOneActiveLine (void)
static void	text80 (void)
static void	checkLineBytes (const char *stage, uint32_t wanted)
static void	checkDoubledLayout (const char *stage)
static void	checkPackedLayout (const char *stage)
static void	checkGeometry (const char *stage, int doubled)
static uint16_t	dimmed (uint16_t src)
static void	setScanlines (int on)
static void	checkDimMaths (void)
static void	checkDimScale1 (void)
int	main (void)

Variables
static pico9918_scanline_params_t	params = {H_VIRTUAL, 240, false, 0}
static PICO9918_PIXEL_T	line [H_VIRTUAL+16]
static int	failures

Detailed Description

pico9918-core - the post-palette pixel path

Copyright (c) 2026 Troy Schrapel

This code is licensed under the MIT license

https://github.com/visrealm/pico9918-core

Everything between a palette index and a host's framebuffer, which nothing else covers: the goldens render a 256-byte line and digest it, and the scene suite compares palette INDEXES. Neither looks at a wide row's colours, and neither looks at where in the scanline the picture lands.

Both are load-bearing for a host. The LUT has two layouts - a pixel pair per entry for every mode that doubles, and a nibble pair for the 4bpp 80-column line - and a row that picks the wrong one still renders, in the wrong colours. The geometry is denominated in 32-bit words holding two pixels, so a host that reads the window at the wrong offset gets the border fill through the middle of its picture.

Definition in file pixel_test.c.

Macro Definition Documentation

H_VIRTUAL

#define H_VIRTUAL   640u

Definition at line 29 of file pixel_test.c.

H_BORDER

#define H_BORDER   ((H_VIRTUAL - TMS9918_PIXELS_X * 2u) / 2u) /* 64 pixels each side */

Definition at line 30 of file pixel_test.c.

SENTINEL

#define SENTINEL   0xbeefu

Definition at line 31 of file pixel_test.c.

Function Documentation

fail()

static void fail ( const char *  what, unsigned  where, unsigned  wanted, unsigned  got  )

static

Definition at line 38 of file pixel_test.c.

regWrite()

static void regWrite ( uint8_t  reg, uint8_t  value  )

static

Definition at line 43 of file pixel_test.c.

unlock()

static void unlock ( void  )

static

Definition at line 49 of file pixel_test.c.

distinctPalette()

static void distinctPalette ( void  )

static

Definition at line 57 of file pixel_test.c.

want()

static uint16_t want ( int  index )

static

Definition at line 62 of file pixel_test.c.

renderLines()

static void renderLines ( uint16_t  from, uint16_t  to  )

static

Definition at line 67 of file pixel_test.c.

activeLine()

static uint16_t activeLine ( void  )

static

Definition at line 74 of file pixel_test.c.

renderOneActiveLine()

static void renderOneActiveLine ( void  )

static

Definition at line 84 of file pixel_test.c.

text80()

static void text80 ( void  )

static

Definition at line 90 of file pixel_test.c.

checkLineBytes()

static void checkLineBytes ( const char *  stage, uint32_t  wanted  )

static

Definition at line 99 of file pixel_test.c.

checkDoubledLayout()

static void checkDoubledLayout ( const char *  stage )

static

Definition at line 115 of file pixel_test.c.

checkPackedLayout()

static void checkPackedLayout ( const char *  stage )

static

Definition at line 133 of file pixel_test.c.

checkGeometry()

static void checkGeometry ( const char *  stage, int  doubled  )

static

Definition at line 153 of file pixel_test.c.

dimmed()

static uint16_t dimmed ( uint16_t  src )

static

Definition at line 182 of file pixel_test.c.

setScanlines()

static void setScanlines ( int  on )

static

Definition at line 189 of file pixel_test.c.

checkDimMaths()

static void checkDimMaths ( void  )

static

Definition at line 199 of file pixel_test.c.

checkDimScale1()

static void checkDimScale1 ( void  )

static

Definition at line 230 of file pixel_test.c.

main()

int main

(

void

)

Definition at line 259 of file pixel_test.c.

Variable Documentation

params

pico9918_scanline_params_t params = {H_VIRTUAL, 240, false, 0}

static

Definition at line 33 of file pixel_test.c.

line

PICO9918_PIXEL_T line[H_VIRTUAL+16]

static

Definition at line 34 of file pixel_test.c.

failures

int failures

static

Definition at line 36 of file pixel_test.c.