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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5098 | clevermous | 1 | #include "zgl.h" |
| 2 | |||
| 3 | void glopNormal(GLContext * c, GLParam * p) |
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| 4 | { |
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| 5 | V3 v; |
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| 6 | |||
| 7 | v.X = p[1].f; |
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| 8 | v.Y = p[2].f; |
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| 9 | v.Z = p[3].f; |
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| 10 | |||
| 11 | c->current_normal.X = v.X; |
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| 12 | c->current_normal.Y = v.Y; |
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| 13 | c->current_normal.Z = v.Z; |
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| 14 | c->current_normal.W = 0; |
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| 15 | } |
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| 16 | |||
| 17 | void glopTexCoord(GLContext * c, GLParam * p) |
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| 18 | { |
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| 19 | c->current_tex_coord.X = p[1].f; |
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| 20 | c->current_tex_coord.Y = p[2].f; |
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| 21 | c->current_tex_coord.Z = p[3].f; |
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| 22 | c->current_tex_coord.W = p[4].f; |
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| 23 | } |
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| 24 | |||
| 25 | void glopEdgeFlag(GLContext * c, GLParam * p) |
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| 26 | { |
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| 27 | c->current_edge_flag = p[1].i; |
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| 28 | } |
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| 29 | |||
| 30 | void glopColor(GLContext * c, GLParam * p) |
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| 31 | { |
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| 32 | |||
| 33 | c->current_color.X = p[1].f; |
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| 34 | c->current_color.Y = p[2].f; |
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| 35 | c->current_color.Z = p[3].f; |
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| 36 | c->current_color.W = p[4].f; |
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| 37 | c->longcurrent_color[0] = p[5].ui; |
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| 38 | c->longcurrent_color[1] = p[6].ui; |
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| 39 | c->longcurrent_color[2] = p[7].ui; |
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| 40 | |||
| 41 | if (c->color_material_enabled) { |
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| 42 | GLParam q[7]; |
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| 43 | q[0].op = OP_Material; |
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| 44 | q[1].i = c->current_color_material_mode; |
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| 45 | q[2].i = c->current_color_material_type; |
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| 46 | q[3].f = p[1].f; |
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| 47 | q[4].f = p[2].f; |
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| 48 | q[5].f = p[3].f; |
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| 49 | q[6].f = p[4].f; |
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| 50 | glopMaterial(c, q); |
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| 51 | } |
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| 52 | } |
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| 53 | |||
| 54 | |||
| 55 | void gl_eval_viewport(GLContext * c) |
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| 56 | { |
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| 57 | GLViewport *v; |
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| 58 | float zsize = (1 << (ZB_Z_BITS + ZB_POINT_Z_FRAC_BITS)); |
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| 59 | |||
| 60 | v = &c->viewport; |
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| 61 | |||
| 62 | v->trans.X = ((v->xsize - 0.5) / 2.0) + v->xmin; |
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| 63 | v->trans.Y = ((v->ysize - 0.5) / 2.0) + v->ymin; |
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| 64 | v->trans.Z = ((zsize - 0.5) / 2.0) + ((1 << ZB_POINT_Z_FRAC_BITS)) / 2; |
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| 65 | |||
| 66 | v->scale.X = (v->xsize - 0.5) / 2.0; |
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| 67 | v->scale.Y = -(v->ysize - 0.5) / 2.0; |
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| 68 | v->scale.Z = -((zsize - 0.5) / 2.0); |
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| 69 | } |
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| 70 | |||
| 71 | void glopBegin(GLContext * c, GLParam * p) |
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| 72 | { |
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| 73 | int type; |
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| 74 | M4 tmp; |
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| 75 | |||
| 76 | assert(c->in_begin == 0); |
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| 77 | |||
| 78 | type = p[1].i; |
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| 79 | c->begin_type = type; |
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| 80 | c->in_begin = 1; |
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| 81 | c->vertex_n = 0; |
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| 82 | c->vertex_cnt = 0; |
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| 83 | |||
| 84 | if (c->matrix_model_projection_updated) { |
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| 85 | |||
| 86 | if (c->lighting_enabled) { |
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| 87 | /* precompute inverse modelview */ |
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| 88 | gl_M4_Inv(&tmp, c->matrix_stack_ptr[0]); |
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| 89 | gl_M4_Transpose(&c->matrix_model_view_inv, &tmp); |
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| 90 | } else { |
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| 91 | float *m = &c->matrix_model_projection.m[0][0]; |
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| 92 | /* precompute projection matrix */ |
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| 93 | gl_M4_Mul(&c->matrix_model_projection, |
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| 94 | c->matrix_stack_ptr[1], |
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| 95 | c->matrix_stack_ptr[0]); |
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| 96 | /* test to accelerate computation */ |
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| 97 | c->matrix_model_projection_no_w_transform = 0; |
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| 98 | if (m[12] == 0.0 && m[13] == 0.0 && m[14] == 0.0) |
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| 99 | c->matrix_model_projection_no_w_transform = 1; |
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| 100 | } |
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| 101 | |||
| 102 | /* test if the texture matrix is not Identity */ |
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| 103 | c->apply_texture_matrix = !gl_M4_IsId(c->matrix_stack_ptr[2]); |
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| 104 | |||
| 105 | c->matrix_model_projection_updated = 0; |
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| 106 | } |
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| 107 | /* viewport */ |
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| 108 | if (c->viewport.updated) { |
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| 109 | gl_eval_viewport(c); |
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| 110 | c->viewport.updated = 0; |
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| 111 | } |
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| 112 | /* triangle drawing functions */ |
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| 113 | if (c->render_mode == GL_SELECT) { |
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| 114 | c->draw_triangle_front = gl_draw_triangle_select; |
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| 115 | c->draw_triangle_back = gl_draw_triangle_select; |
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| 116 | } else { |
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| 117 | switch (c->polygon_mode_front) { |
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| 118 | case GL_POINT: |
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| 119 | c->draw_triangle_front = gl_draw_triangle_point; |
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| 120 | break; |
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| 121 | case GL_LINE: |
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| 122 | c->draw_triangle_front = gl_draw_triangle_line; |
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| 123 | break; |
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| 124 | default: |
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| 125 | c->draw_triangle_front = gl_draw_triangle_fill; |
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| 126 | break; |
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| 127 | } |
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| 128 | |||
| 129 | switch (c->polygon_mode_back) { |
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| 130 | case GL_POINT: |
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| 131 | c->draw_triangle_back = gl_draw_triangle_point; |
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| 132 | break; |
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| 133 | case GL_LINE: |
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| 134 | c->draw_triangle_back = gl_draw_triangle_line; |
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| 135 | break; |
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| 136 | default: |
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| 137 | c->draw_triangle_back = gl_draw_triangle_fill; |
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| 138 | break; |
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| 139 | } |
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| 140 | } |
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| 141 | } |
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| 142 | |||
| 143 | /* coords, tranformation , clip code and projection */ |
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| 144 | /* TODO : handle all cases */ |
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| 145 | static inline void gl_vertex_transform(GLContext * c, GLVertex * v) |
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| 146 | { |
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| 147 | float *m; |
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| 148 | V4 *n; |
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| 149 | |||
| 150 | if (c->lighting_enabled) { |
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| 151 | /* eye coordinates needed for lighting */ |
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| 152 | |||
| 153 | m = &c->matrix_stack_ptr[0]->m[0][0]; |
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| 154 | v->ec.X = (v->coord.X * m[0] + v->coord.Y * m[1] + |
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| 155 | v->coord.Z * m[2] + m[3]); |
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| 156 | v->ec.Y = (v->coord.X * m[4] + v->coord.Y * m[5] + |
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| 157 | v->coord.Z * m[6] + m[7]); |
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| 158 | v->ec.Z = (v->coord.X * m[8] + v->coord.Y * m[9] + |
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| 159 | v->coord.Z * m[10] + m[11]); |
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| 160 | v->ec.W = (v->coord.X * m[12] + v->coord.Y * m[13] + |
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| 161 | v->coord.Z * m[14] + m[15]); |
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| 162 | |||
| 163 | /* projection coordinates */ |
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| 164 | m = &c->matrix_stack_ptr[1]->m[0][0]; |
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| 165 | v->pc.X = (v->ec.X * m[0] + v->ec.Y * m[1] + |
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| 166 | v->ec.Z * m[2] + v->ec.W * m[3]); |
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| 167 | v->pc.Y = (v->ec.X * m[4] + v->ec.Y * m[5] + |
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| 168 | v->ec.Z * m[6] + v->ec.W * m[7]); |
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| 169 | v->pc.Z = (v->ec.X * m[8] + v->ec.Y * m[9] + |
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| 170 | v->ec.Z * m[10] + v->ec.W * m[11]); |
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| 171 | v->pc.W = (v->ec.X * m[12] + v->ec.Y * m[13] + |
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| 172 | v->ec.Z * m[14] + v->ec.W * m[15]); |
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| 173 | |||
| 174 | m = &c->matrix_model_view_inv.m[0][0]; |
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| 175 | n = &c->current_normal; |
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| 176 | |||
| 177 | v->normal.X = (n->X * m[0] + n->Y * m[1] + n->Z * m[2]); |
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| 178 | v->normal.Y = (n->X * m[4] + n->Y * m[5] + n->Z * m[6]); |
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| 179 | v->normal.Z = (n->X * m[8] + n->Y * m[9] + n->Z * m[10]); |
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| 180 | |||
| 181 | if (c->normalize_enabled) { |
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| 182 | gl_V3_Norm(&v->normal); |
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| 183 | } |
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| 184 | } else { |
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| 185 | /* no eye coordinates needed, no normal */ |
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| 186 | /* NOTE: W = 1 is assumed */ |
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| 187 | m = &c->matrix_model_projection.m[0][0]; |
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| 188 | |||
| 189 | v->pc.X = (v->coord.X * m[0] + v->coord.Y * m[1] + |
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| 190 | v->coord.Z * m[2] + m[3]); |
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| 191 | v->pc.Y = (v->coord.X * m[4] + v->coord.Y * m[5] + |
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| 192 | v->coord.Z * m[6] + m[7]); |
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| 193 | v->pc.Z = (v->coord.X * m[8] + v->coord.Y * m[9] + |
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| 194 | v->coord.Z * m[10] + m[11]); |
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| 195 | if (c->matrix_model_projection_no_w_transform) { |
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| 196 | v->pc.W = m[15]; |
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| 197 | } else { |
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| 198 | v->pc.W = (v->coord.X * m[12] + v->coord.Y * m[13] + |
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| 199 | v->coord.Z * m[14] + m[15]); |
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| 200 | } |
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| 201 | } |
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| 202 | |||
| 203 | v->clip_code = gl_clipcode(v->pc.X, v->pc.Y, v->pc.Z, v->pc.W); |
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| 204 | } |
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| 205 | |||
| 206 | void glopVertex(GLContext * c, GLParam * p) |
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| 207 | { |
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| 208 | GLVertex *v; |
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| 209 | int n, i, cnt; |
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| 210 | |||
| 211 | assert(c->in_begin != 0); |
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| 212 | |||
| 213 | n = c->vertex_n; |
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| 214 | cnt = c->vertex_cnt; |
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| 215 | cnt++; |
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| 216 | c->vertex_cnt = cnt; |
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| 217 | |||
| 218 | /* quick fix to avoid crashes on large polygons */ |
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| 219 | if (n >= c->vertex_max) { |
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| 220 | GLVertex *newarray; |
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| 221 | c->vertex_max <<= 1; /* just double size */ |
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| 222 | newarray = gl_malloc(sizeof(GLVertex) * c->vertex_max); |
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| 223 | if (!newarray) { |
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| 224 | gl_fatal_error("unable to allocate GLVertex array.\n"); |
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| 225 | } |
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| 226 | memcpy(newarray, c->vertex, n * sizeof(GLVertex)); |
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| 227 | gl_free(c->vertex); |
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| 228 | c->vertex = newarray; |
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| 229 | } |
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| 230 | /* new vertex entry */ |
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| 231 | v = &c->vertex[n]; |
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| 232 | n++; |
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| 233 | |||
| 234 | v->coord.X = p[1].f; |
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| 235 | v->coord.Y = p[2].f; |
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| 236 | v->coord.Z = p[3].f; |
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| 237 | v->coord.W = p[4].f; |
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| 238 | |||
| 239 | gl_vertex_transform(c, v); |
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| 240 | |||
| 241 | /* color */ |
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| 242 | |||
| 243 | if (c->lighting_enabled) { |
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| 244 | gl_shade_vertex(c, v); |
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| 245 | } else { |
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| 246 | v->color = c->current_color; |
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| 247 | } |
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| 248 | |||
| 249 | /* tex coords */ |
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| 250 | |||
| 251 | if (c->texture_2d_enabled) { |
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| 252 | if (c->apply_texture_matrix) { |
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| 253 | gl_M4_MulV4(&v->tex_coord, c->matrix_stack_ptr[2], &c->current_tex_coord); |
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| 254 | } else { |
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| 255 | v->tex_coord = c->current_tex_coord; |
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| 256 | } |
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| 257 | } |
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| 258 | /* precompute the mapping to the viewport */ |
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| 259 | if (v->clip_code == 0) |
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| 260 | gl_transform_to_viewport(c, v); |
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| 261 | |||
| 262 | /* edge flag */ |
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| 263 | |||
| 264 | v->edge_flag = c->current_edge_flag; |
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| 265 | |||
| 266 | switch (c->begin_type) { |
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| 267 | case GL_POINTS: |
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| 268 | gl_draw_point(c, &c->vertex[0]); |
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| 269 | n = 0; |
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| 270 | break; |
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| 271 | |||
| 272 | case GL_LINES: |
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| 273 | if (n == 2) { |
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| 274 | gl_draw_line(c, &c->vertex[0], &c->vertex[1]); |
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| 275 | n = 0; |
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| 276 | } |
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| 277 | break; |
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| 278 | case GL_LINE_STRIP: |
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| 279 | case GL_LINE_LOOP: |
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| 280 | if (n == 1) { |
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| 281 | c->vertex[2] = c->vertex[0]; |
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| 282 | } else if (n == 2) { |
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| 283 | gl_draw_line(c, &c->vertex[0], &c->vertex[1]); |
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| 284 | c->vertex[0] = c->vertex[1]; |
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| 285 | n = 1; |
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| 286 | } |
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| 287 | break; |
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| 288 | |||
| 289 | case GL_TRIANGLES: |
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| 290 | if (n == 3) { |
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| 291 | gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]); |
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| 292 | n = 0; |
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| 293 | } |
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| 294 | break; |
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| 295 | case GL_TRIANGLE_STRIP: |
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| 296 | if (cnt >= 3) { |
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| 297 | if (n == 3) |
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| 298 | n = 0; |
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| 299 | /* needed to respect triangle orientation */ |
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| 300 | switch(cnt & 1) { |
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| 301 | case 0: |
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| 302 | gl_draw_triangle(c,&c->vertex[2],&c->vertex[1],&c->vertex[0]); |
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| 303 | break; |
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| 304 | default: |
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| 305 | case 1: |
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| 306 | gl_draw_triangle(c,&c->vertex[0],&c->vertex[1],&c->vertex[2]); |
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| 307 | break; |
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| 308 | } |
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| 309 | } |
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| 310 | break; |
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| 311 | case GL_TRIANGLE_FAN: |
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| 312 | if (n == 3) { |
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| 313 | gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]); |
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| 314 | c->vertex[1] = c->vertex[2]; |
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| 315 | n = 2; |
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| 316 | } |
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| 317 | break; |
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| 318 | |||
| 319 | case GL_QUADS: |
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| 320 | if (n == 4) { |
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| 321 | c->vertex[2].edge_flag = 0; |
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| 322 | gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]); |
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| 323 | c->vertex[2].edge_flag = 1; |
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| 324 | c->vertex[0].edge_flag = 0; |
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| 325 | gl_draw_triangle(c, &c->vertex[0], &c->vertex[2], &c->vertex[3]); |
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| 326 | n = 0; |
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| 327 | } |
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| 328 | break; |
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| 329 | |||
| 330 | case GL_QUAD_STRIP: |
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| 331 | if (n == 4) { |
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| 332 | gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]); |
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| 333 | gl_draw_triangle(c, &c->vertex[1], &c->vertex[3], &c->vertex[2]); |
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| 334 | for (i = 0; i < 2; i++) |
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| 335 | c->vertex[i] = c->vertex[i + 2]; |
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| 336 | n = 2; |
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| 337 | } |
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| 338 | break; |
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| 339 | case GL_POLYGON: |
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| 340 | break; |
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| 341 | default: |
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| 342 | gl_fatal_error("glBegin: type %x not handled\n", c->begin_type); |
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| 343 | } |
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| 344 | |||
| 345 | c->vertex_n = n; |
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| 346 | } |
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| 347 | |||
| 348 | void glopEnd(GLContext * c, GLParam * param) |
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| 349 | { |
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| 350 | assert(c->in_begin == 1); |
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| 351 | |||
| 352 | if (c->begin_type == GL_LINE_LOOP) { |
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| 353 | if (c->vertex_cnt >= 3) { |
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| 354 | gl_draw_line(c, &c->vertex[0], &c->vertex[2]); |
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| 355 | } |
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| 356 | } else if (c->begin_type == GL_POLYGON) { |
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| 357 | int i = c->vertex_cnt; |
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| 358 | while (i >= 3) { |
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| 359 | i--; |
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| 360 | gl_draw_triangle(c, &c->vertex[i], &c->vertex[0], &c->vertex[i - 1]); |
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| 361 | } |
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| 362 | } |
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| 363 | c->in_begin = 0; |
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| 364 | } |