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Make resolution constant

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This commit is contained in:
Miloslav Číž 2019-05-08 14:14:56 +02:00
parent 5749abee92
commit eaea810b85
2 changed files with 25 additions and 20 deletions
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23
s3l.h
View file

@ -107,6 +107,17 @@
#include <stdint.h>
#ifndef S3L_RESOLUTION_X
#define S3L_RESOLUTION_X 640 //< Redefine to your screen x resolution.
#endif
#ifndef S3L_RESOLUTION_Y
#define S3L_RESOLUTION_Y 480 //< Redefine to your screen y resolution.
#endif
#define S3L_HALF_RESOLUTION_X (S3L_RESOLUTION_X >> 1)
#define S3L_HALF_RESOLUTION_Y (S3L_RESOLUTION_Y >> 1)
typedef int32_t S3L_Unit; /**< Units of measurement in 3D space. There is
S3L_FRACTIONS_PER_UNIT in one spatial unit.
By dividing the unit into fractions we
@ -515,16 +526,12 @@ static inline void S3L_initTransoform3D(S3L_Transform3D *t)
typedef struct
{
uint16_t resolutionX;
uint16_t resolutionY;
S3L_Unit focalLength; ///< Defines the field of view (FOV).
S3L_Transform3D transform;
} S3L_Camera;
static inline void S3L_initCamera(S3L_Camera *c)
{
c->resolutionX = 128;
c->resolutionY = 64;
c->focalLength = S3L_FRACTIONS_PER_UNIT;
S3L_initTransoform3D(&(c->transform));
}
@ -1053,11 +1060,11 @@ void S3L_makeCameraMatrix(S3L_Transform3D cameraTransform, S3L_Mat4 *m)
static inline void S3L_mapCameraToScreen(S3L_Vec4 point, S3L_Camera *camera,
S3L_ScreenCoord *screenX, S3L_ScreenCoord *screenY)
{
uint16_t halfW = camera->resolutionX >> 1; // TODO: precompute earlier?
uint16_t halfH = camera->resolutionY >> 1;
*screenX =
S3L_HALF_RESOLUTION_X + (point.x * S3L_HALF_RESOLUTION_X) / point.z;
*screenX = halfW + (point.x * halfW) / point.z;
*screenY = halfH - (point.y * halfW) / point.z;
*screenY =
S3L_HALF_RESOLUTION_Y - (point.y * S3L_HALF_RESOLUTION_X) / point.z;
// ^ S3L_FRACTIONS_PER_UNIT cancel out
}

22
testSDL.c
View file

@ -9,10 +9,10 @@
#define S3L_PIXEL_FUNCTION drawPixel
#include "s3l.h"
#define S3L_RESOLUTION_X 640
#define S3L_RESOLUTION_Y 480
#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480
#include "s3l.h"
const int16_t test_coords[] =
{
@ -50,18 +50,18 @@ const uint8_t testTexture[] =
2,2,2,0,0,0,2,2,2,2,0,0,0,2,2,2
};
uint32_t pixels[SCREEN_WIDTH * SCREEN_HEIGHT];
uint32_t pixels[S3L_RESOLUTION_X * S3L_RESOLUTION_Y];
uint32_t frame = 0;
void clearScreen()
{
memset(pixels,0,SCREEN_WIDTH * SCREEN_HEIGHT * sizeof(uint32_t));
memset(pixels,0,S3L_RESOLUTION_X * S3L_RESOLUTION_Y * sizeof(uint32_t));
}
static inline void setPixel(int x, int y, uint8_t red, uint8_t green, uint8_t blue)
{
if (x < 0 || x >= SCREEN_WIDTH || y < 0 || y >= SCREEN_HEIGHT)
if (x < 0 || x >= S3L_RESOLUTION_X || y < 0 || y >= S3L_RESOLUTION_Y)
return;
uint32_t r = red & 0x000000FF;
@ -73,7 +73,7 @@ static inline void setPixel(int x, int y, uint8_t red, uint8_t green, uint8_t bl
uint32_t b = blue & 0x000000FF;
b = b << 8;
pixels[y * SCREEN_WIDTH + x] = r | g | b;
pixels[y * S3L_RESOLUTION_X + x] = r | g | b;
}
uint8_t texturePixel(int32_t u, int32_t v)
@ -160,15 +160,13 @@ S3L_drawTriangle(rotX0,rotY0,rotX1,rotY1,rotX2,rotY2,conf,0);
int main()
{
SDL_Window *window = SDL_CreateWindow("test", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
SDL_Window *window = SDL_CreateWindow("test", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, S3L_RESOLUTION_X, S3L_RESOLUTION_Y, SDL_WINDOW_SHOWN);
SDL_Renderer *renderer = SDL_CreateRenderer(window,-1,0);
SDL_Texture *texture = SDL_CreateTexture(renderer,SDL_PIXELFORMAT_RGBX8888, SDL_TEXTUREACCESS_STATIC, SCREEN_WIDTH, SCREEN_HEIGHT);
SDL_Texture *texture = SDL_CreateTexture(renderer,SDL_PIXELFORMAT_RGBX8888, SDL_TEXTUREACCESS_STATIC, S3L_RESOLUTION_X, S3L_RESOLUTION_Y);
SDL_Surface *screenSurface = SDL_GetWindowSurface(window);
SDL_Event event;
S3L_initCamera(&camera);
camera.resolutionX = SCREEN_WIDTH;
camera.resolutionY = SCREEN_HEIGHT;
camera.transform.translation.z = -S3L_FRACTIONS_PER_UNIT * 2;
// camera.transform.translation.x = S3L_FRACTIONS_PER_UNIT;
// camera.transform.translation.y = S3L_FRACTIONS_PER_UNIT;
@ -181,7 +179,7 @@ int main()
while (running)
{
draw();
SDL_UpdateTexture(texture,NULL,pixels,SCREEN_WIDTH * sizeof(uint32_t));
SDL_UpdateTexture(texture,NULL,pixels,S3L_RESOLUTION_X * sizeof(uint32_t));
while (SDL_PollEvent(&event))
{