79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/*
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* This file is part of the Minecraft Overviewer.
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*
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* Minecraft Overviewer is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation, either version 3 of the License, or (at
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* your option) any later version.
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*
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* Minecraft Overviewer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the Overviewer. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "../overviewer.h"
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typedef struct {
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PyObject* black_color;
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PyObject* white_color;
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unsigned int sealevel;
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} PrimitiveHeightFading;
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static int
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height_fading_start(void* data, RenderState* state, PyObject* support) {
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PrimitiveHeightFading* self = (PrimitiveHeightFading*)data;
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if (!render_mode_parse_option(support, "sealevel", "I", &(self->sealevel)))
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return 1;
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self->black_color = PyObject_GetAttrString(support, "black_color");
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self->white_color = PyObject_GetAttrString(support, "white_color");
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return 0;
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}
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static void
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height_fading_finish(void* data, RenderState* state) {
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PrimitiveHeightFading* self = (PrimitiveHeightFading*)data;
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Py_DECREF(self->black_color);
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Py_DECREF(self->white_color);
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}
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static void
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height_fading_draw(void* data, RenderState* state, PyObject* src, PyObject* mask, PyObject* mask_light) {
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float alpha;
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PrimitiveHeightFading* self = (PrimitiveHeightFading*)data;
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int y = 16 * state->chunky + state->y;
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/* do some height fading */
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PyObject* height_color = self->white_color;
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/* current formula requires y to be between 0 and 127, so scale it */
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y = (y * 128) / (2 * self->sealevel);
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/* negative alpha => darkness, positive => light */
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alpha = (1.0 / (1 + expf((70 - y) / 11.0))) * 0.6 - 0.55;
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if (alpha < 0.0) {
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alpha *= -1;
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height_color = self->black_color;
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}
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alpha_over_full(state->img, height_color, mask_light, alpha, state->imgx, state->imgy, 0, 0);
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}
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RenderPrimitiveInterface primitive_height_fading = {
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"height-fading",
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sizeof(PrimitiveHeightFading),
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height_fading_start,
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height_fading_finish,
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NULL,
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NULL,
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height_fading_draw,
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};
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