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annotate src/shadow.cc @ 18:986c0b76513f

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shadows, not completed
author John Tsiombikas <nuclear@member.fsf.org>
date Mon, 29 Jun 2015 01:29:36 +0300
parents
children 37dead56f01e
rev   line source
nuclear@18 1 #include <assert.h>
nuclear@18 2 #include "opengl.h"
nuclear@18 3 #include "shadow.h"
nuclear@18 4 #include "vmath/vmath.h"
nuclear@18 5
nuclear@18 6 static int tex_sz, prev_vp[4];
nuclear@18 7 static unsigned int fbo, depth_tex, rb_color;
nuclear@18 8 static Matrix4x4 shadow_mat;
nuclear@18 9
nuclear@18 10 bool init_shadow(int sz)
nuclear@18 11 {
nuclear@18 12 if(!glcaps.fbo) {
nuclear@18 13 return true;
nuclear@18 14 }
nuclear@18 15
nuclear@18 16 tex_sz = sz;
nuclear@18 17
nuclear@18 18 glGenFramebuffers(1, &fbo);
nuclear@18 19 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
nuclear@18 20
nuclear@18 21 glGenTextures(1, &depth_tex);
nuclear@18 22 glBindTexture(GL_TEXTURE_2D, depth_tex);
nuclear@18 23 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
nuclear@18 24 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
nuclear@18 25 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@18 26 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@18 27 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_R_TO_TEXTURE);
nuclear@18 28 glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, tex_sz, tex_sz, 0,
nuclear@18 29 GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);
nuclear@18 30 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth_tex, 0);
nuclear@18 31
nuclear@18 32 assert(glGetError() == GL_NO_ERROR);
nuclear@18 33
nuclear@18 34 glDrawBuffer(GL_FALSE);
nuclear@18 35 glReadBuffer(GL_FALSE);
nuclear@18 36
nuclear@18 37 if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
nuclear@18 38 fprintf(stderr, "incomplete framebuffer\n");
nuclear@18 39 return false;
nuclear@18 40 }
nuclear@18 41
nuclear@18 42 glBindFramebuffer(GL_FRAMEBUFFER, 0);
nuclear@18 43 glDrawBuffer(GL_BACK);
nuclear@18 44 glReadBuffer(GL_BACK);
nuclear@18 45 assert(glGetError() == GL_NO_ERROR);
nuclear@18 46
nuclear@18 47 return true;
nuclear@18 48 }
nuclear@18 49
nuclear@18 50 void destroy_shadow()
nuclear@18 51 {
nuclear@18 52 glDeleteTextures(1, &depth_tex);
nuclear@18 53 glDeleteRenderbuffers(1, &rb_color);
nuclear@18 54 glDeleteFramebuffers(1, &fbo);
nuclear@18 55 }
nuclear@18 56
nuclear@18 57 void begin_shadow_pass(const Vector3 &lpos, const Vector3 &ltarg, float lfov)
nuclear@18 58 {
nuclear@18 59 Matrix4x4 viewmat, projmat;
nuclear@18 60
nuclear@18 61 glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
nuclear@18 62 glDisable(GL_LIGHTING);
nuclear@18 63 glColorMask(0, 0, 0, 0);
nuclear@18 64 glDepthMask(1);
nuclear@18 65
nuclear@18 66 projmat.set_perspective(DEG_TO_RAD(lfov) * 2.0, 1.0, 0.5, 500.0);
nuclear@18 67 viewmat.set_lookat(lpos, ltarg, Vector3(0, 1, 0));
nuclear@18 68 shadow_mat = viewmat * projmat;
nuclear@18 69
nuclear@18 70 glMatrixMode(GL_PROJECTION);
nuclear@18 71 glPushMatrix();
nuclear@18 72 glLoadTransposeMatrixf(projmat[0]);
nuclear@18 73 glMatrixMode(GL_MODELVIEW);
nuclear@18 74 glPushMatrix();
nuclear@18 75 glLoadTransposeMatrixf(viewmat[0]);
nuclear@18 76
nuclear@18 77 glGetIntegerv(GL_VIEWPORT, prev_vp);
nuclear@18 78 glViewport(0, 0, tex_sz, tex_sz);
nuclear@18 79
nuclear@18 80 glCullFace(GL_FRONT);
nuclear@18 81 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
nuclear@18 82 }
nuclear@18 83
nuclear@18 84
nuclear@18 85 void end_shadow_pass()
nuclear@18 86 {
nuclear@18 87 glBindFramebuffer(GL_FRAMEBUFFER, 0);
nuclear@18 88 glCullFace(GL_BACK);
nuclear@18 89
nuclear@18 90 glViewport(prev_vp[0], prev_vp[1], prev_vp[2], prev_vp[3]);
nuclear@18 91
nuclear@18 92 glMatrixMode(GL_PROJECTION);
nuclear@18 93 glPopMatrix();
nuclear@18 94 glMatrixMode(GL_MODELVIEW);
nuclear@18 95 glPopMatrix();
nuclear@18 96
nuclear@18 97 glPopAttrib();
nuclear@18 98 }
nuclear@18 99
nuclear@18 100 Matrix4x4 get_shadow_matrix()
nuclear@18 101 {
nuclear@18 102 return shadow_mat;
nuclear@18 103 }
nuclear@18 104
nuclear@18 105 unsigned int get_shadow_tex()
nuclear@18 106 {
nuclear@18 107 return depth_tex;
nuclear@18 108 }