1 files changed, 31 insertions, 3 deletions

diff --git a/main.c b/main.c
index 705c35f..b2847b1 100644
--- a/main.c
+++ b/main.c
@@ -8,6 +8,7 @@
 
 #include "fill_vert.h"
 #include "visuals_frag.h"
+#include "output_frag.h"
 
 void resize_handler(GLFWwindow* window, int width, int height) {
 	glViewport(0, 0, width, height);
@@ -68,18 +69,45 @@ int main(int argc, char** argv) {
 	glewInit();
 
 	init_tri();
-	GLuint shader = link_shaders(
+
+	GLuint visuals = link_shaders(
 		vert_shader(fill_vert, fill_vert_size),
 		frag_shader(visuals_frag, visuals_frag_size)
 	);
-	init_uniform(shader, window);
+	uniforms_t * visuals_uniforms = init_uniforms(visuals, window);
+
+	GLuint output = link_shaders(
+		vert_shader(fill_vert, fill_vert_size),
+		frag_shader(output_frag, output_frag_size)
+	);
+	uniforms_t * output_uniforms = init_uniforms(output, window);
+
+	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, 800, 600, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	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);
+
+	glUseProgram(visuals);
 
 	// main draw loop
 	while (!glfwWindowShouldClose(window)) {
 		glfwPollEvents();
 
-		update_uniform();
+		update_uniforms(visuals_uniforms);
+		// glBindFramebuffer(GL_FRAMEBUFFER, fbo);
 		glDrawArrays(GL_TRIANGLES, 0, 3);
+		// glBindFramebuffer(GL_FRAMEBUFFER, 0);
 
 		glfwSwapBuffers(window);
 	}