New PDF release: Computer graphics handbook: geometry and mathematics

By Michael E Mortenson

Emphasizes and reinforces important techniques, together with parametric geometry, ameliorations, vectors, matrix equipment, information constructions, set of rules improvement, and computational potency. includes boxed info concentrating on a particular challenge that expands at the specific topic of that part. Highlights vital fabric with approximately 2 hundred illustrations. comprises a number of routines and chosen solutions.

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Esto cuadra muy bien con la forma en que funciona un juego. Acuérdate del game loop, en el que leíamos la entrada del jugador, la procesábamos, haciamos cálculos, movimientos o cualquier otra cosa y vuelta a empezar. La función que nos permite leer el siguiente evento disponible es: int SDL_PollEvent(SDL_Event *event); Esta función devuelve 1 si había un evento pendiente y 0 en caso contrario. Si hay algún evento disponible se almacena en el parámetro event. Como veremos a continuación, hay diferentes tipos de evento.

Con esto le indicamos a SDL que queremos copiar toda la superficie en la que se haya el gráfico. 30 P R O G R A M A C I Ó N D E V I D E O J U E G O S C O N S D L Algún avispado lector se preguntará qué ocurre si los campos w y h de los parámetros srcdest y dstrect no coinciden. Realmente no ocurre nada, ya que los campos w y h de dstrect no se utilizan. Por último, decir que si la la copia tiene éxito la función devuelve el valor 0, y –1 en caso contrario. Otra utilidad de la estructura SDL_Rect es la de dibujar rectángulos en la pantalla mediante la función SDL_FillRect.

Dado que el CD puede almacenar tanto audio como datos, no es posible usar como patrón de medida el tiempo o la capacidad. Un frame equivale aproximadamente a 2 Kilobytes. Por último tenemos un array con la información de cada pista. Una pista va descrita por la siguiente estructura: typedef struct{ Uint8 id; Uint8 type; Uint32 length; Uint32 offset; } SDL_CDtrack; El campo id es el número de la pista. El campo type puede tomar los valores SDL_AUDIO_TRACK o SDL_DATA_TRACK. El primero nos indica que es una pista de audio, y el segundo que es una pista de datos.

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