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-rw-r--r--Makefile6
-rw-r--r--glslview.c104
-rw-r--r--glslwrite.c204
3 files changed, 92 insertions, 222 deletions
diff --git a/Makefile b/Makefile
index 0023a99..9e5304e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
all : glslview glslwrite
glslview : glslview.c
- gcc -o glslview glslview.c -lSDL2 -lGL -lGLEW -Wall
+ $(CC) -o $@ $^ -lSDL2 -lGL -lGLEW -Wall
-glslwrite : glslwrite.c
- gcc -o glslwrite glslwrite.c -lSDL2 -lpng -lGL -lGLEW -Wall
+glslwrite : glslview.c
+ $(CC) -o $@ $^ -DGLSLWRITE -lSDL2 -lpng -lGL -lGLEW -Wall
diff --git a/glslview.c b/glslview.c
index c78bd7d..940c30d 100644
--- a/glslview.c
+++ b/glslview.c
@@ -1,16 +1,25 @@
#include <stdbool.h>
+#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
+#ifdef GLSLWRITE
+# include <png.h>
+#endif
+
#include <GL/glew.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_opengl.h>
+#ifdef GLSLWRITE
+static unsigned frame_time = 0;
+#endif
+
-static GLint time;
-static GLint res;
+static GLint time_loc;
+static GLint res_loc;
static char * readfile(const char *filename) {
@@ -88,22 +97,71 @@ static void init(char *filename) {
printProgramInfoLog(program);
glBindFragDataLocation(program, 0, "fragColor");
- time = glGetUniformLocation(program, "time");
- res = glGetUniformLocation(program, "res");
+ time_loc = glGetUniformLocation(program, "time");
+ res_loc = glGetUniformLocation(program, "res");
glUseProgram(program);
+}
+#ifdef GLSLWRITE
+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, frame_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*i*width];
-static void render(SDL_Window *window) {
- int width, height;
- SDL_GetWindowSize(window, &width, &height);
+ 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);
+}
+#endif
+
+static void render(int width, int height) {
glViewport(0, 0, (GLsizei)width, (GLsizei)height);
- glUniform1f(time, SDL_GetTicks());
- glUniform2f(res, width, height);
+#ifdef GLSLWRITE
+ glUniform1f(time_loc, frame_time);
+#else
+ glUniform1f(time_loc, SDL_GetTicks());
+#endif
+ glUniform2f(res_loc, width, height);
glBegin(GL_QUADS);
glVertex2f(-1, -1);
@@ -112,21 +170,30 @@ static void render(SDL_Window *window) {
glVertex2f(-1, 1);
glEnd();
- SDL_GL_SwapWindow(window);
+#ifdef GLSLWRITE
+ frame_time += 20;
+#endif
}
int main(int argc, char *argv[]) {
bool running = true;
+#ifdef GLSLWRITE
+ if (argc != 3) {
+ fprintf(stderr, "Usage: glslwrite <shader> <output directory>\n");
+ exit(1);
+ }
+#else
if (argc != 2) {
- fprintf(stderr, "Usage: glslview <shader>\n");
+ fprintf(stderr, "Usage: glslview <shader> <output directory>\n");
exit(1);
}
+#endif
SDL_Init(SDL_INIT_VIDEO);
- SDL_Window *window = SDL_CreateWindow("glslview", 0, 0, 800, 800, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
+ SDL_Window *window = SDL_CreateWindow("glslwrite", 0, 0, 800, 800, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
SDL_GL_CreateContext(window);
init(argv[1]);
@@ -141,8 +208,15 @@ int main(int argc, char *argv[]) {
}
}
- render(window);
- //usleep(1);
+ int width, height;
+ SDL_GetWindowSize(window, &width, &height);
+
+ render(width, height);
+ SDL_GL_SwapWindow(window);
+
+#ifdef GLSLWRITE
+ savePNG(width, height, argv[2]);
+#endif
}
return 0;
diff --git a/glslwrite.c b/glslwrite.c
deleted file mode 100644
index ebe81d4..0000000
--- a/glslwrite.c
+++ /dev/null
@@ -1,204 +0,0 @@
-#include <stdbool.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <unistd.h>
-
-#include <png.h>
-
-#include <GL/glew.h>
-
-#include <SDL2/SDL.h>
-#include <SDL2/SDL_opengl.h>
-
-
-
-static unsigned frame_time = 0;
-
-
-static GLint time_loc;
-static GLint res_loc;
-
-
-static char * readfile(const char *filename) {
- FILE *f = fopen(filename, "r");
- if (!f)
- return NULL;
-
- size_t size = 1024;
- char *buffer = malloc(size+1);
- size_t count = 0, r;
-
- do {
- if (count == size) {
- size *= 2;
- buffer = realloc(buffer, size+1);
- }
-
- r = fread(buffer+count, 1, size-count, f);
- count += r;
- } while (r);
-
- fclose(f);
-
- buffer[count] = 0;
-
- return buffer;
-}
-
-static void printShaderInfoLog(GLuint obj) {
- GLint length = 0;
-
- glGetShaderiv(obj, GL_INFO_LOG_LENGTH, &length);
-
- if(length > 0) {
- char log[length];
-
- glGetShaderInfoLog(obj, sizeof(log), NULL, log);
- fprintf(stderr, "%s\n", log);
- }
-}
-
-static void printProgramInfoLog(GLuint obj) {
- GLint length = 0;
-
- glGetProgramiv(obj, GL_INFO_LOG_LENGTH, &length);
-
- if(length > 0) {
- char log[length];
-
- glGetProgramInfoLog(obj, sizeof(log), NULL, log);
- fprintf(stderr, "%s\n", log);
- }
-}
-
-static void init(char *filename) {
- glewInit();
-
- glDisable(GL_DEPTH_TEST);
-
- char *shader = readfile(filename);
- if (!shader) {
- fprintf(stderr, "Error: unable to read '%s'\n", filename);
- exit(1);
- }
-
- GLuint frag = glCreateShader(GL_FRAGMENT_SHADER);
- glShaderSource(frag, 1, (const GLchar **)&shader, NULL);
- glCompileShader(frag);
- printShaderInfoLog(frag);
-
- GLuint program = glCreateProgram();
- glAttachShader(program, frag);
-
- glLinkProgram(program);
- printProgramInfoLog(program);
-
- glBindFragDataLocation(program, 0, "fragColor");
- time_loc = glGetUniformLocation(program, "time");
- res_loc = glGetUniformLocation(program, "res");
-
- glUseProgram(program);
-}
-
-static void savePNG(uint8_t *pixels, int width, int height, const char *output_dir) {
- char filename[strlen(output_dir) + 20];
- snprintf(filename, sizeof(filename), "%s/%010u.png", output_dir, frame_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*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);
-}
-
-static void render(SDL_Window *window, const char *output_dir) {
- int width, height;
- SDL_GetWindowSize(window, &width, &height);
-
- glViewport(0, 0, (GLsizei)width, (GLsizei)height);
-
- glUniform1f(time_loc, frame_time);
- glUniform2f(res_loc, width, height);
-
- glBegin(GL_QUADS);
- glVertex2f(-1, -1);
- glVertex2f(1, -1);
- glVertex2f(1, 1);
- glVertex2f(-1, 1);
- glEnd();
-
- SDL_GL_SwapWindow(window);
-
- uint8_t pixels[width*height*4];
- glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8, pixels);
- savePNG(pixels, width, height, output_dir);
-
- frame_time += 20;
-}
-
-
-int main(int argc, char *argv[]) {
- bool running = true;
-
- if (argc != 3) {
- fprintf(stderr, "Usage: glslwrite <shader> <output directory>\n");
- exit(1);
- }
-
- SDL_Init(SDL_INIT_VIDEO);
-
- SDL_Window *window = SDL_CreateWindow("glslwrite", 0, 0, 800, 800, SDL_WINDOW_OPENGL|SDL_WINDOW_RESIZABLE);
- SDL_GL_CreateContext(window);
-
- init(argv[1]);
-
- while (running) {
- SDL_Event e;
-
- while( SDL_PollEvent(&e)) {
- if(e.type == SDL_QUIT) {
- running = false;
- break;
- }
- }
-
- render(window, argv[2]);
- //usleep(1);
- }
-
- return 0;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-23 10:46:42 +0100