141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*
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Copyright (c) 2016, Matthias Schiffer <mschiffer@universe-factory.net>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "common.h"
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#include <stdbool.h>
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#include <stdio.h>
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#include <png.h>
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#include <GL/glew.h>
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#include <SDL2/SDL.h>
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#include <SDL2/SDL_opengl.h>
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static void savePNG(int width, int height, const char *output_dir) {
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uint8_t pixels[width*height*4];
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glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, pixels);
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char filename[strlen(output_dir) + 20];
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snprintf(filename, sizeof(filename), "%s/%010u.png", output_dir, (unsigned)current_time);
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FILE *f = fopen(filename, "wb");
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if (!f) {
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fprintf(stderr, "unable to open PNG file\n");
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exit(1);
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}
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png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (!png_ptr) {
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fprintf(stderr, "unable to open PNG file\n");
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exit(1);
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}
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png_set_swap_alpha(png_ptr);
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png_infop info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr) {
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fprintf(stderr, "unable to create PNG info struct\n");
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exit(1);
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}
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if (setjmp(png_jmpbuf(png_ptr))) {
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fprintf(stderr, "unable to write PNG file\n");
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exit(1);
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}
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png_init_io(png_ptr, f);
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png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA,
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
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uint8_t *row_pointers[height];
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for (size_t i = 0; i < height; i++)
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row_pointers[i] = &pixels[4*(height-1-i)*width];
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png_set_rows(png_ptr, info_ptr, row_pointers);
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png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
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png_destroy_write_struct(&png_ptr, &info_ptr);
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fclose(f);
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}
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int main(int argc, char *argv[]) {
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if (argc != 3) {
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fprintf(stderr, "Usage: glslwrite <shader> <output directory>\n");
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exit(1);
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}
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SDL_Init(SDL_INIT_VIDEO);
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SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
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SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
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SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
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SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
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SDL_Window *window = SDL_CreateWindow("glslwrite", 0, 0, 800, 800, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
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SDL_GLContext ctx = SDL_GL_CreateContext(window);
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filename = argv[1];
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init();
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load();
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while (true) {
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SDL_Event e;
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while (SDL_PollEvent(&e)) {
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switch (e.type) {
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case SDL_KEYDOWN:
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switch (e.key.keysym.sym) {
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case SDLK_ESCAPE:
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goto quit;
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}
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break;
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case SDL_QUIT:
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goto quit;
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}
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}
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int width, height;
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SDL_GetWindowSize(window, &width, &height);
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render(width, height);
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SDL_GL_SwapWindow(window);
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savePNG(width, height, argv[2]);
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current_time += 20;
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}
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quit:
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SDL_GL_DeleteContext(ctx);
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SDL_DestroyWindow(window);
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SDL_Quit();
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return 0;
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}
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