95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
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#include "./screen.h"
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#include <assert.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include "util/math/matrix.h"
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#include "util/math/vector.h"
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#define CM_PER_INCH_ 2.54f
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#define CHUNK_INCH_ 16
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#define MAX_SCALE_ (1/.5f)
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bool locommon_screen_valid(const locommon_screen_t* screen) {
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return
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screen != NULL &&
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vec2_valid(&screen->resolution) &&
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vec2_valid(&screen->dpi) &&
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screen->resolution.x > 0 &&
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screen->resolution.y > 0 &&
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screen->dpi.x > 0 &&
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screen->dpi.y > 0;
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}
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void locommon_screen_calc_pixels_from_cm(
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const locommon_screen_t* screen, vec2_t* pixels, const vec2_t* cm) {
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assert(locommon_screen_valid(screen));
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assert(pixels != NULL);
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assert(vec2_valid(cm));
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locommon_screen_calc_pixels_from_inch(
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screen, pixels, &vec2(cm->x/CM_PER_INCH_, cm->y/CM_PER_INCH_));
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}
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void locommon_screen_calc_pixels_from_inch(
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const locommon_screen_t* screen, vec2_t* pixels, const vec2_t* inch) {
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assert(locommon_screen_valid(screen));
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assert(pixels != NULL);
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assert(vec2_valid(inch));
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*pixels = *inch;
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pixels->x *= screen->dpi.x;
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pixels->y *= screen->dpi.y;
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}
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void locommon_screen_calc_winpos_from_cm(
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const locommon_screen_t* screen, vec2_t* winpos, const vec2_t* cm) {
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assert(locommon_screen_valid(screen));
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assert(winpos != NULL);
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assert(vec2_valid(cm));
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locommon_screen_calc_winpos_from_inch(
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screen, winpos, &vec2(cm->x/CM_PER_INCH_, cm->y/CM_PER_INCH_));
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}
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void locommon_screen_calc_winpos_from_inch(
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const locommon_screen_t* screen, vec2_t* winpos, const vec2_t* inch) {
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assert(locommon_screen_valid(screen));
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assert(winpos != NULL);
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assert(vec2_valid(inch));
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locommon_screen_calc_pixels_from_inch(screen, winpos, inch);
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winpos->x /= screen->resolution.x / 2;
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winpos->y /= screen->resolution.y / 2;
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}
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void locommon_screen_calc_winpos_from_pixels(
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const locommon_screen_t* screen, vec2_t* winpos, const vec2_t* pixels) {
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assert(locommon_screen_valid(screen));
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assert(winpos != NULL);
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assert(vec2_valid(pixels));
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*winpos = *pixels;
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winpos->x /= screen->resolution.x / 2;
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winpos->y /= screen->resolution.y / 2;
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}
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void locommon_screen_build_projection_matrix(
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const locommon_screen_t* screen, mat4_t* proj) {
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assert(screen != NULL);
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assert(proj != NULL);
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vec2_t scale;
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locommon_screen_calc_winpos_from_inch(
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screen, &scale, &vec2(CHUNK_INCH_, CHUNK_INCH_));
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if (scale.x > MAX_SCALE_) {
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scale.y *= MAX_SCALE_/scale.x;
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scale.x = MAX_SCALE_;
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}
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*proj = mat4_scale(scale.x, scale.y, 1);
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}
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