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-rw-r--r--glslwrite.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/glslwrite.c b/glslwrite.c
new file mode 100644
index 0000000..e9f746a
--- /dev/null
+++ b/glslwrite.c
@@ -0,0 +1,144 @@
+/*
+ Copyright (c) 2016, Matthias Schiffer <mschiffer@universe-factory.net>
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+ this list of conditions and the following disclaimer.
+ 2. Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include "common.h"
+
+#include <stdbool.h>
+#include <stdio.h>
+
+#include <png.h>
+
+#include <GL/glew.h>
+
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_opengl.h>
+
+
+void extra_load(GLuint program) {
+}
+
+static void savePNG(int width, int height, const char *output_dir) {
+ uint8_t pixels[width*height*4];
+ glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, pixels);
+
+ char filename[strlen(output_dir) + 20];
+ snprintf(filename, sizeof(filename), "%s/%010u.png", output_dir, (unsigned)current_time);
+
+ FILE *f = fopen(filename, "wb");
+ if (!f) {
+ fprintf(stderr, "unable to open PNG file\n");
+ exit(1);
+ }
+
+ png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+ if (!png_ptr) {
+ fprintf(stderr, "unable to open PNG file\n");
+ exit(1);
+ }
+
+ png_set_swap_alpha(png_ptr);
+
+ png_infop info_ptr = png_create_info_struct(png_ptr);
+ if (!info_ptr) {
+ fprintf(stderr, "unable to create PNG info struct\n");
+ exit(1);
+ }
+
+ if (setjmp(png_jmpbuf(png_ptr))) {
+ fprintf(stderr, "unable to write PNG file\n");
+ exit(1);
+ }
+
+ png_init_io(png_ptr, f);
+
+ png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA,
+ PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+
+ uint8_t *row_pointers[height];
+ for (size_t i = 0; i < height; i++)
+ row_pointers[i] = &pixels[4*(height-1-i)*width];
+
+ png_set_rows(png_ptr, info_ptr, row_pointers);
+ png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
+
+ png_destroy_write_struct(&png_ptr, &info_ptr);
+ fclose(f);
+}
+
+int main(int argc, char *argv[]) {
+ if (argc != 3) {
+ fprintf(stderr, "Usage: glslwrite <shader> <output directory>\n");
+ exit(1);
+ }
+
+ SDL_Init(SDL_INIT_VIDEO);
+
+ SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
+ SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
+ SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
+ SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
+
+ SDL_Window *window = SDL_CreateWindow("glslwrite", 0, 0, 800, 800, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
+ SDL_GLContext ctx = SDL_GL_CreateContext(window);
+
+ filename = argv[1];
+ init();
+ load();
+
+ while (true) {
+ SDL_Event e;
+
+ while (SDL_PollEvent(&e)) {
+ switch (e.type) {
+ case SDL_KEYDOWN:
+ switch (e.key.keysym.sym) {
+
+ case SDLK_ESCAPE:
+ goto quit;
+ }
+ break;
+
+ case SDL_QUIT:
+ goto quit;
+ }
+ }
+
+ int width, height;
+ SDL_GetWindowSize(window, &width, &height);
+
+ render(width, height);
+ SDL_GL_SwapWindow(window);
+
+ savePNG(width, height, argv[2]);
+ current_time += 20;
+ }
+
+ quit:
+ SDL_GL_DeleteContext(ctx);
+ SDL_DestroyWindow(window);
+ SDL_Quit();
+
+ return 0;
+}