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annotate src/shadow.cc @ 21:c3fbf9616dbd

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slot bounds, and ray testing
author John Tsiombikas <nuclear@member.fsf.org>
date Thu, 02 Jul 2015 00:01:39 +0300
parents 986c0b76513f
children
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@19 6 bool shadow_pass;
nuclear@19 7
nuclear@18 8 static int tex_sz, prev_vp[4];
nuclear@18 9 static unsigned int fbo, depth_tex, rb_color;
nuclear@18 10 static Matrix4x4 shadow_mat;
nuclear@18 11
nuclear@18 12 bool init_shadow(int sz)
nuclear@18 13 {
nuclear@19 14 if(!glcaps.fbo || !glcaps.shadow) {
nuclear@19 15 return false;
nuclear@18 16 }
nuclear@18 17
nuclear@18 18 tex_sz = sz;
nuclear@19 19 printf("initializing shadow buffer (%dx%d)\n", tex_sz, tex_sz);
nuclear@18 20
nuclear@18 21 glGenFramebuffers(1, &fbo);
nuclear@18 22 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
nuclear@18 23
nuclear@18 24 glGenTextures(1, &depth_tex);
nuclear@18 25 glBindTexture(GL_TEXTURE_2D, depth_tex);
nuclear@19 26 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
nuclear@19 27 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
nuclear@18 28 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@18 29 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@18 30 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_COMPARE_MODE, GL_COMPARE_R_TO_TEXTURE);
nuclear@18 31 glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT24, tex_sz, tex_sz, 0,
nuclear@18 32 GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);
nuclear@18 33 glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth_tex, 0);
nuclear@18 34
nuclear@18 35 assert(glGetError() == GL_NO_ERROR);
nuclear@18 36
nuclear@18 37 glDrawBuffer(GL_FALSE);
nuclear@18 38 glReadBuffer(GL_FALSE);
nuclear@18 39
nuclear@18 40 if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
nuclear@18 41 fprintf(stderr, "incomplete framebuffer\n");
nuclear@18 42 return false;
nuclear@18 43 }
nuclear@18 44
nuclear@18 45 glBindFramebuffer(GL_FRAMEBUFFER, 0);
nuclear@18 46 glDrawBuffer(GL_BACK);
nuclear@18 47 glReadBuffer(GL_BACK);
nuclear@18 48 assert(glGetError() == GL_NO_ERROR);
nuclear@18 49
nuclear@18 50 return true;
nuclear@18 51 }
nuclear@18 52
nuclear@18 53 void destroy_shadow()
nuclear@18 54 {
nuclear@18 55 glDeleteTextures(1, &depth_tex);
nuclear@18 56 glDeleteRenderbuffers(1, &rb_color);
nuclear@18 57 glDeleteFramebuffers(1, &fbo);
nuclear@18 58 }
nuclear@18 59
nuclear@18 60 void begin_shadow_pass(const Vector3 &lpos, const Vector3 &ltarg, float lfov)
nuclear@18 61 {
nuclear@19 62 shadow_pass = true;
nuclear@18 63
nuclear@18 64 glPushAttrib(GL_ENABLE_BIT | GL_COLOR_BUFFER_BIT);
nuclear@18 65 glDisable(GL_LIGHTING);
nuclear@18 66 glColorMask(0, 0, 0, 0);
nuclear@18 67 glDepthMask(1);
nuclear@18 68
nuclear@19 69 Matrix4x4 viewmat;
nuclear@19 70 glGetFloatv(GL_MODELVIEW_MATRIX, viewmat[0]);
nuclear@19 71 viewmat.transpose();
nuclear@19 72
nuclear@19 73 Matrix4x4 lt_viewmat, lt_projmat;
nuclear@19 74 lt_projmat.set_perspective(DEG_TO_RAD(lfov) * 2.0, 1.0, 8.0, 50.0);
nuclear@19 75 lt_viewmat.set_lookat(lpos, ltarg, Vector3(0, 1, 0));
nuclear@19 76 shadow_mat = lt_projmat * lt_viewmat * viewmat.inverse();
nuclear@18 77
nuclear@18 78 glMatrixMode(GL_PROJECTION);
nuclear@18 79 glPushMatrix();
nuclear@19 80 glLoadTransposeMatrixf(lt_projmat[0]);
nuclear@19 81
nuclear@18 82 glMatrixMode(GL_MODELVIEW);
nuclear@18 83 glPushMatrix();
nuclear@19 84 glLoadTransposeMatrixf(lt_viewmat[0]);
nuclear@18 85
nuclear@18 86 glGetIntegerv(GL_VIEWPORT, prev_vp);
nuclear@18 87 glViewport(0, 0, tex_sz, tex_sz);
nuclear@18 88
nuclear@18 89 glBindFramebuffer(GL_FRAMEBUFFER, fbo);
nuclear@19 90
nuclear@19 91 glPolygonOffset(2, 2);
nuclear@19 92 glEnable(GL_POLYGON_OFFSET_FILL);
nuclear@19 93
nuclear@19 94 glClear(GL_DEPTH_BUFFER_BIT);
nuclear@19 95 glUseProgram(0);
nuclear@18 96 }
nuclear@18 97
nuclear@18 98
nuclear@18 99 void end_shadow_pass()
nuclear@18 100 {
nuclear@19 101 shadow_pass = false;
nuclear@19 102
nuclear@18 103 glBindFramebuffer(GL_FRAMEBUFFER, 0);
nuclear@18 104
nuclear@18 105 glViewport(prev_vp[0], prev_vp[1], prev_vp[2], prev_vp[3]);
nuclear@18 106
nuclear@18 107 glMatrixMode(GL_PROJECTION);
nuclear@18 108 glPopMatrix();
nuclear@18 109 glMatrixMode(GL_MODELVIEW);
nuclear@18 110 glPopMatrix();
nuclear@18 111
nuclear@18 112 glPopAttrib();
nuclear@18 113 }
nuclear@18 114
nuclear@18 115 Matrix4x4 get_shadow_matrix()
nuclear@18 116 {
nuclear@18 117 return shadow_mat;
nuclear@19 118
nuclear@19 119 /*
nuclear@19 120 glMatrixMode(GL_MODELVIEW);
nuclear@19 121 glPushMatrix();
nuclear@19 122 glLoadIdentity();
nuclear@19 123 gluPerspective(lfov * 2.0, 1.0, 0.5, 50.0);
nuclear@19 124 gluLookAt(lpos.x, lpos.y, lpos.z, ltarg.x, ltarg.y, ltarg.z, 0, 1, 0);
nuclear@19 125
nuclear@19 126 float mat[16];
nuclear@19 127 glGetFloatv(GL_MODELVIEW_MATRIX, mat);
nuclear@19 128
nuclear@19 129 Matrix4x4 res;
nuclear@19 130 memcpy(res[0], mat, sizeof mat);
nuclear@19 131 res.transpose();
nuclear@19 132 return res;
nuclear@19 133 */
nuclear@18 134 }
nuclear@18 135
nuclear@18 136 unsigned int get_shadow_tex()
nuclear@18 137 {
nuclear@18 138 return depth_tex;
nuclear@18 139 }