| [1] | 1 | #include "zgl.h" |
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| 2 | |
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| 3 | int glRenderMode(int mode) |
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| 4 | { |
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| 5 | GLContext *c=gl_get_context(); |
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| 6 | int result=0; |
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| 7 | |
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| 8 | switch(c->render_mode) { |
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| 9 | case GL_RENDER: |
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| 10 | break; |
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| 11 | case GL_SELECT: |
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| 12 | if (c->select_overflow) { |
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| 13 | result=-c->select_hits; |
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| 14 | } else { |
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| 15 | result=c->select_hits; |
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| 16 | } |
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| 17 | c->select_overflow=0; |
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| 18 | c->select_ptr=c->select_buffer; |
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| 19 | c->name_stack_size=0; |
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| 20 | break; |
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| 21 | default: |
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| 22 | assert(0); |
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| 23 | } |
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| 24 | switch(mode) { |
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| 25 | case GL_RENDER: |
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| 26 | c->render_mode=GL_RENDER; |
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| 27 | break; |
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| 28 | case GL_SELECT: |
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| 29 | c->render_mode=GL_SELECT; |
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| 30 | assert( c->select_buffer != NULL); |
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| 31 | c->select_ptr=c->select_buffer; |
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| 32 | c->select_hits=0; |
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| 33 | c->select_overflow=0; |
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| 34 | c->select_hit=NULL; |
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| 35 | break; |
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| 36 | default: |
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| 37 | assert(0); |
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| 38 | } |
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| 39 | return result; |
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| 40 | } |
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| 41 | |
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| 42 | void glSelectBuffer(int size,unsigned int *buf) |
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| 43 | { |
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| 44 | GLContext *c=gl_get_context(); |
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| 45 | |
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| 46 | assert(c->render_mode != GL_SELECT); |
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| 47 | |
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| 48 | c->select_buffer=buf; |
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| 49 | c->select_size=size; |
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| 50 | } |
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| 51 | |
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| 52 | |
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| 53 | void glopInitNames(GLContext *c,GLParam *p) |
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| 54 | { |
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| 55 | if (c->render_mode == GL_SELECT) { |
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| 56 | c->name_stack_size=0; |
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| 57 | c->select_hit=NULL; |
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| 58 | } |
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| 59 | } |
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| 60 | |
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| 61 | void glopPushName(GLContext *c,GLParam *p) |
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| 62 | { |
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| 63 | if (c->render_mode == GL_SELECT) { |
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| 64 | assert(c->name_stack_size<MAX_NAME_STACK_DEPTH); |
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| 65 | c->name_stack[c->name_stack_size++]=p[1].i; |
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| 66 | c->select_hit=NULL; |
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| 67 | } |
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| 68 | } |
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| 69 | |
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| 70 | void glopPopName(GLContext *c,GLParam *p) |
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| 71 | { |
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| 72 | if (c->render_mode == GL_SELECT) { |
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| 73 | assert(c->name_stack_size>0); |
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| 74 | c->name_stack_size--; |
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| 75 | c->select_hit=NULL; |
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| 76 | } |
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| 77 | } |
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| 78 | |
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| 79 | void glopLoadName(GLContext *c,GLParam *p) |
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| 80 | { |
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| 81 | if (c->render_mode == GL_SELECT) { |
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| 82 | assert(c->name_stack_size>0); |
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| 83 | c->name_stack[c->name_stack_size-1]=p[1].i; |
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| 84 | c->select_hit=NULL; |
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| 85 | } |
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| 86 | } |
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| 87 | |
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| 88 | void gl_add_select(GLContext *c,unsigned int zmin,unsigned int zmax) |
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| 89 | { |
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| 90 | unsigned int *ptr; |
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| 91 | int n,i; |
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| 92 | |
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| 93 | if (!c->select_overflow) { |
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| 94 | if (c->select_hit==NULL) { |
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| 95 | n=c->name_stack_size; |
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| 96 | if ((c->select_ptr-c->select_buffer+3+n) > |
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| 97 | c->select_size) { |
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| 98 | c->select_overflow=1; |
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| 99 | } else { |
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| 100 | ptr=c->select_ptr; |
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| 101 | c->select_hit=ptr; |
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| 102 | *ptr++=c->name_stack_size; |
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| 103 | *ptr++=zmin; |
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| 104 | *ptr++=zmax; |
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| 105 | for(i=0;i<n;i++) *ptr++=c->name_stack[i]; |
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| 106 | c->select_ptr=ptr; |
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| 107 | c->select_hits++; |
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| 108 | } |
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| 109 | } else { |
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| 110 | if (zmin<c->select_hit[1]) c->select_hit[1]=zmin; |
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| 111 | if (zmax>c->select_hit[2]) c->select_hit[2]=zmax; |
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| 112 | } |
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| 113 | } |
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| 114 | } |
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