100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/*
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* This software is licensed under the terms of the MIT-License
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* See COPYING for further information.
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* ---
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* Copyright (C) 2011, Lukas Weber <laochailan@web.de>
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*/
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#include "fbo.h"
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#include "global.h"
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static float sanitize_scale(float scale) {
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// return ftopow2(clamp(scale, 0.25, 4.0));
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scale = max(0.1, scale);
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return ((int)(scale*VIEWPORT_W*VIEWPORT_H+0.9999))/(float)VIEWPORT_W/VIEWPORT_H;
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}
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void init_fbo(FBO *fbo, float scale) {
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glGenTextures(1, &fbo->tex);
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glBindTexture(GL_TEXTURE_2D, fbo->tex);
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fbo->scale = scale = sanitize_scale(scale);
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fbo->nw = topow2(scale * VIEWPORT_W);
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fbo->nh = topow2(scale * VIEWPORT_H);
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log_debug("FBO %p: q=%f, w=%i, h=%i", (void*)fbo, fbo->scale, fbo->nw, fbo->nh);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, fbo->nw, fbo->nh, 0, GL_BGR, GL_UNSIGNED_BYTE, NULL);
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glGenFramebuffers(1,&fbo->fbo);
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glBindFramebuffer(GL_FRAMEBUFFER, fbo->fbo);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fbo->tex, 0);
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glGenTextures(1, &fbo->depth);
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glBindTexture(GL_TEXTURE_2D, fbo->depth);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT16, fbo->nw, fbo->nh, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D,fbo->depth, 0);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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void reinit_fbo(FBO *fbo, float scale) {
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if(!fbo->scale) {
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// fbo was never initialized
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init_fbo(fbo, scale);
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return;
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}
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if(fbo->scale != sanitize_scale(scale)) {
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delete_fbo(fbo);
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init_fbo(fbo, scale);
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}
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}
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void delete_fbo(FBO *fbo) {
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glDeleteFramebuffers(1, &fbo->fbo);
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glDeleteTextures(1, &fbo->depth);
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glDeleteTextures(1, &fbo->tex);
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}
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void draw_fbo(FBO *fbo) {
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float wq = (fbo->scale*VIEWPORT_W)/(float)fbo->nw;
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float hq = (fbo->scale*VIEWPORT_H)/(float)fbo->nh;
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glMatrixMode(GL_TEXTURE);
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glLoadIdentity();
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glScalef(wq, hq, 1);
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glMatrixMode(GL_MODELVIEW);
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glPushMatrix();
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glTranslatef(VIEWPORT_W/2, VIEWPORT_H/2, 0);
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glScalef(VIEWPORT_W, VIEWPORT_H, 1);
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glEnable(GL_TEXTURE_2D);
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glBindTexture(GL_TEXTURE_2D, fbo->tex);
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glDrawArrays(GL_QUADS, 4, 4);
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glDisable(GL_TEXTURE_2D);
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glPopMatrix();
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glMatrixMode(GL_TEXTURE);
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glLoadIdentity();
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glMatrixMode(GL_MODELVIEW);
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}
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void draw_fbo_viewport(FBO *fbo) {
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// assumption: rendering into another, identical FBO
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glViewport(0, 0, fbo->scale*VIEWPORT_W, fbo->scale*VIEWPORT_H);
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set_ortho_ex(VIEWPORT_W,VIEWPORT_H);
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draw_fbo(fbo);
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}
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