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-rw-r--r--fb.c30
-rw-r--r--fb.h6
-rw-r--r--main.c18
-rw-r--r--makefile1
4 files changed, 39 insertions, 16 deletions
diff --git a/fb.c b/fb.c
new file mode 100644
index 0000000..479808c
--- /dev/null
+++ b/fb.c
@@ -0,0 +1,30 @@
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+
+#include "fb.h"
+#include "die.h"
+#include "consts.h"
+
+GLuint init_fb() {
+ GLuint fbo;
+ glGenFramebuffers(1, &fbo);
+
+ // configure newly created framebuffer
+ glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+
+ GLuint buffer;
+ glGenTextures(1, &buffer);
+ glBindTexture(GL_TEXTURE_2D, buffer);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, RES_H, RES_V, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, buffer, 0);
+ if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+ die("can't initialize framebuffer??\n");
+
+ // use default framebuffer again
+ glBindFramebuffer(GL_FRAMEBUFFER, 0);
+
+ return fbo;
+}
+
diff --git a/fb.h b/fb.h
new file mode 100644
index 0000000..cc0df69
--- /dev/null
+++ b/fb.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <GL/glew.h>
+
+GLuint init_fb();
+
diff --git a/main.c b/main.c
index e65c829..075f264 100644
--- a/main.c
+++ b/main.c
@@ -3,6 +3,7 @@
#include <GLFW/glfw3.h>
#include "consts.h"
+#include "fb.h"
#include "shader.h"
#include "die.h"
#include "uniform.h"
@@ -81,22 +82,7 @@ int main(int argc, char** argv) {
frag_shader(pass2_frag, pass2_frag_size)
);
- GLuint fbo;
- glGenFramebuffers(1, &fbo);
- glBindFramebuffer(GL_FRAMEBUFFER, fbo);
-
- GLuint last_frame;
- glGenTextures(1, &last_frame);
- glBindTexture(GL_TEXTURE_2D, last_frame);
- // todo: what to do when the size changes?
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, RES_H, RES_V, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, last_frame, 0);
- if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
- die("can't initialize framebuffer??\n");
- glBindFramebuffer(GL_FRAMEBUFFER, 0);
-
+ GLuint fbo = init_fb();
// main draw loop
while (!glfwWindowShouldClose(window)) {
diff --git a/makefile b/makefile
index 719f0f0..829b235 100644
--- a/makefile
+++ b/makefile
@@ -18,6 +18,7 @@ main: pass1_frag.o
main: fill_vert.o
main: pass2_frag.o
main: uniform.o
+main: fb.o
# fix compile order
main.o: fill_vert.h