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readme
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README.md
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README.md
@ -33,12 +33,13 @@ What does Prog8 provide?
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- conditional branches
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- conditional branches
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- floating point operations (requires the C64 Basic ROM routines for this)
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- floating point operations (requires the C64 Basic ROM routines for this)
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- 'when' statement to provide a concise jump table alternative to if/elseif chains
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- 'when' statement to provide a concise jump table alternative to if/elseif chains
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- many built-in functions such as ``sin``, ``cos``, ``rnd``, ``abs``, ``min``, ``max``, ``sqrt``, ``msb``, ``rol``, ``ror``, ``swap``, ``memset``, ``memcopy``, ``sort`` and ``reverse``
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- structs to group together sets of variables and manipulate them at once
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- structs to group together sets of variables and manipulate them at once
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- many built-in functions such as ``sin``, ``cos``, ``rnd``, ``abs``, ``min``, ``max``, ``sqrt``, ``msb``, ``rol``, ``ror``, ``swap``, ``sort`` and ``reverse``
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- various powerful built-in libraries to do I/O, number conversions, graphics and more
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- convenience abstractions for low level aspects such as ZeroPage handling, program startup, explicit memory addresses
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- convenience abstractions for low level aspects such as ZeroPage handling, program startup, explicit memory addresses
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- fast execution speed due to compilation to native assembly code
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- fast execution speed due to compilation to native assembly code
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- inline assembly allows you to have full control when every cycle or byte matters
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- inline assembly allows you to have full control when every cycle or byte matters
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- supports the sixteen 'virtual' 16-bit registers R0 .. R15 from the Commander X16, also on the C64.
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- supports the sixteen 'virtual' 16-bit registers R0 .. R15 from the Commander X16, and provides them also on the C64.
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*Rapid edit-compile-run-debug cycle:*
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*Rapid edit-compile-run-debug cycle:*
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@ -49,8 +50,8 @@ What does Prog8 provide?
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*Two supported compiler targets* (contributions to improve these or to add support for other machines are welcome!):
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*Two supported compiler targets* (contributions to improve these or to add support for other machines are welcome!):
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- "c64": Commodore-64 (6510 CPU = almost a 6502), the main target.
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- "c64": Commodore-64 (6510 CPU = almost a 6502)
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- "cx16": [CommanderX16](https://www.commanderx16.com) (65c02 CPU) .
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- "cx16": [CommanderX16](https://www.commanderx16.com) (65c02 CPU)
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- If you only use standard kernel and prog8 library routines, it is possible to compile the *exact same program* for both machines (just change the compiler target flag)!
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- If you only use standard kernel and prog8 library routines, it is possible to compile the *exact same program* for both machines (just change the compiler target flag)!
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@ -85,9 +86,7 @@ This code calculates prime numbers using the Sieve of Eratosthenes algorithm::
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ubyte candidate_prime = 2 ; is increased in the loop
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ubyte candidate_prime = 2 ; is increased in the loop
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sub start() {
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sub start() {
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; clear the sieve, to reset starting situation on subsequent runs
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sys.memset(sieve, 256, false) ; clear the sieve
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memset(sieve, 256, false)
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; calculate primes
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txt.print("prime numbers up to 255:\n\n")
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txt.print("prime numbers up to 255:\n\n")
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ubyte amount=0
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ubyte amount=0
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repeat {
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repeat {
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@ -98,17 +97,17 @@ This code calculates prime numbers using the Sieve of Eratosthenes algorithm::
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txt.print(", ")
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txt.print(", ")
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amount++
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amount++
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}
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}
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txt.chrout('\n')
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txt.nl()
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txt.print("number of primes (expected 54): ")
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txt.print("number of primes (expected 54): ")
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txt.print_ub(amount)
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txt.print_ub(amount)
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txt.chrout('\n')
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txt.nl()
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}
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}
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sub find_next_prime() -> ubyte {
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sub find_next_prime() -> ubyte {
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while sieve[candidate_prime] {
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while sieve[candidate_prime] {
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candidate_prime++
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candidate_prime++
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if candidate_prime==0
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if candidate_prime==0
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return 0 ; we wrapped; no more primes available in the sieve
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return 0 ; we wrapped; no more primes
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}
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}
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; found next one, mark the multiples and return it.
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; found next one, mark the multiples and return it.
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@ -125,6 +124,7 @@ This code calculates prime numbers using the Sieve of Eratosthenes algorithm::
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when compiled an ran on a C-64 you'll get:
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when compiled an ran on a C-64 you'll get:
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![c64 screen](docs/source/_static/primes_example.png)
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![c64 screen](docs/source/_static/primes_example.png)
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@ -141,7 +141,8 @@ If you want to play a video game, a fully working Tetris clone is included in th
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![tehtriz_screen](docs/source/_static/tehtriz.png)
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![tehtriz_screen](docs/source/_static/tehtriz.png)
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The CommanderX16 compiler target is quite capable already too, here's a well known space ship
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There are a couple of examples specially made for the CommanderX16 compiler target.
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animated in 3D with hidden line removal, in the CommanderX16 emulator:
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For instance here's a well known space ship animated in 3D with hidden line removal,
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in the CommanderX16 emulator:
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![cobra3d](docs/source/_static/cobra3d.png)
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![cobra3d](docs/source/_static/cobra3d.png)
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