132 lines
4 KiB
C
132 lines
4 KiB
C
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#include <stdlib.h>
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#include <math.h>
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#include "shared/types.h"
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#include "shared/functions.h"
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#include "shared/globals.h"
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#include "shared/constants.h"
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#include "clouds.h"
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ColorGradation _gradation;
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#define SPHERE_SIZE 1000.0
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void skySave(FILE* f)
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{
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}
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void skyLoad(FILE* f)
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{
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}
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Color skyGetColor(Vector3 start, Vector3 direction)
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{
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direction = v3Normalize(direction);
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return colorGradationGet(&_gradation, direction.y * 0.5 + 0.5);
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}
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Color skyProjectRay(Vector3 start, Vector3 direction)
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{
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Color color_sky, color_clouds;
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direction = v3Normalize(direction);
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color_sky = skyGetColor(start, direction);
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color_clouds = cloudsGetColor(start, v3Add(start, v3Scale(direction, SPHERE_SIZE)));
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colorMask(&color_sky, &color_clouds);
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return color_sky;
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}
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void skySetGradation(ColorGradation grad)
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{
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_gradation = grad;
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}
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static int _postProcessFragment(RenderFragment* fragment)
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{
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Vector3 location, direction;
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Color color_sky, color_clouds;
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location = fragment->vertex.location;
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direction = v3Sub(location, camera_location);
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color_sky = skyGetColor(camera_location, v3Normalize(direction));
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color_clouds = cloudsGetColor(camera_location, v3Add(camera_location, v3Scale(direction, 10.0)));
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colorMask(&color_sky, &color_clouds);
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fragment->vertex.color = color_sky;
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return 1;
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}
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void skyRender(RenderProgressCallback callback)
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{
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int res_i, res_j;
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int i, j;
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double step_i, step_j;
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double current_i, current_j;
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Vertex vertex1, vertex2, vertex3, vertex4;
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Color col;
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Vector3 direction;
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res_i = render_quality * 20;
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res_j = render_quality * 10;
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step_i = M_PI * 2.0 / (double)res_i;
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step_j = M_PI / (double)res_j;
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col.r = 0.0;
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col.g = 0.0;
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col.a = 1.0;
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for (j = 0; j < res_j; j++)
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{
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if (!callback((double)j / (double)(res_j - 1)))
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{
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return;
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}
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current_j = (double)(j - res_j / 2) * step_j;
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for (i = 0; i < res_i; i++)
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{
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current_i = (double)i * step_i;
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direction.x = SPHERE_SIZE * cos(current_i) * cos(current_j);
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direction.y = SPHERE_SIZE * sin(current_j);
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direction.z = SPHERE_SIZE * sin(current_i) * cos(current_j);
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vertex1.location = v3Add(camera_location, direction);
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col.b = sin(direction.x) * sin(direction.x) * cos(direction.z) * cos(direction.z);
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vertex1.color = col;
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vertex1.callback = _postProcessFragment;
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direction.x = SPHERE_SIZE * cos(current_i + step_i) * cos(current_j);
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direction.y = SPHERE_SIZE * sin(current_j);
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direction.z = SPHERE_SIZE * sin(current_i + step_i) * cos(current_j);
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vertex2.location = v3Add(camera_location, direction);
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col.b = sin(direction.x) * sin(direction.x) * cos(direction.z) * cos(direction.z);
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vertex2.color = col;
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vertex2.callback = _postProcessFragment;
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direction.x = SPHERE_SIZE * cos(current_i + step_i) * cos(current_j + step_j);
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direction.y = SPHERE_SIZE * sin(current_j + step_j);
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direction.z = SPHERE_SIZE * sin(current_i + step_i) * cos(current_j + step_j);
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vertex3.location = v3Add(camera_location, direction);
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col.b = sin(direction.x) * sin(direction.x) * cos(direction.z) * cos(direction.z);
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vertex3.color = col;
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vertex3.callback = _postProcessFragment;
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direction.x = SPHERE_SIZE * cos(current_i) * cos(current_j + step_j);
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direction.y = SPHERE_SIZE * sin(current_j + step_j);
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direction.z = SPHERE_SIZE * sin(current_i) * cos(current_j + step_j);
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vertex4.location = v3Add(camera_location, direction);
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col.b = sin(direction.x) * sin(direction.x) * cos(direction.z) * cos(direction.z);
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vertex4.color = col;
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vertex4.callback = _postProcessFragment;
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/* TODO Triangles at poles */
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renderPushQuad(&vertex1, &vertex4, &vertex3, &vertex2);
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}
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}
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}
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