85 lines
3.1 KiB
C++
85 lines
3.1 KiB
C++
#include "zgl.h"
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#include "string.h"
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void gl_eval_viewport(GLContext * c) {
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GLViewport *v = &c->viewport;
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GLScissor *s = &c->scissor;
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float xsize = v->xsize * (s->right - s->left);
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float xmin = v->xmin + v->xsize * s->left;
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float ysize = v->ysize * (s->top - s->bottom);
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float ymin = v->ymin + v->ysize * (1.0f - s->top);
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float zsize = (float)(1 << (ZB_Z_BITS + ZB_POINT_Z_FRAC_BITS));
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v->trans.v[0] = ((xsize - 0.5f) / 2.0f) + xmin;
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v->trans.v[1] = ((ysize - 0.5f) / 2.0f) + ymin;
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v->trans.v[2] = ((zsize - 0.5f) / 2.0f) + ((1 << ZB_POINT_Z_FRAC_BITS)) / 2;
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v->scale.v[0] = (xsize - 0.5f) / 2.0f;
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v->scale.v[1] = -(ysize - 0.5f) / 2.0f;
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v->scale.v[2] = -((zsize - 0.5f) / 2.0f);
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}
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/* coords, tranformation , clip code and projection */
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/* TODO : handle all cases */
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void
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gl_vertex_transform(GLContext * c, GLVertex * v) {
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float *m;
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V4 *n;
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if (c->lighting_enabled) {
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/* eye coordinates needed for lighting */
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m = &c->matrix_model_view.m[0][0];
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v->ec.v[0] = (v->coord.v[0] * m[0] + v->coord.v[1] * m[1] +
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v->coord.v[2] * m[2] + m[3]);
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v->ec.v[1] = (v->coord.v[0] * m[4] + v->coord.v[1] * m[5] +
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v->coord.v[2] * m[6] + m[7]);
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v->ec.v[2] = (v->coord.v[0] * m[8] + v->coord.v[1] * m[9] +
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v->coord.v[2] * m[10] + m[11]);
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v->ec.v[3] = (v->coord.v[0] * m[12] + v->coord.v[1] * m[13] +
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v->coord.v[2] * m[14] + m[15]);
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/* projection coordinates */
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m = &c->matrix_projection.m[0][0];
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v->pc.v[0] = (v->ec.v[0] * m[0] + v->ec.v[1] * m[1] +
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v->ec.v[2] * m[2] + v->ec.v[3] * m[3]);
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v->pc.v[1] = (v->ec.v[0] * m[4] + v->ec.v[1] * m[5] +
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v->ec.v[2] * m[6] + v->ec.v[3] * m[7]);
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v->pc.v[2] = (v->ec.v[0] * m[8] + v->ec.v[1] * m[9] +
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v->ec.v[2] * m[10] + v->ec.v[3] * m[11]);
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v->pc.v[3] = (v->ec.v[0] * m[12] + v->ec.v[1] * m[13] +
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v->ec.v[2] * m[14] + v->ec.v[3] * m[15]);
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m = &c->matrix_model_view_inv.m[0][0];
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n = &c->current_normal;
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v->normal.v[0] = (n->v[0] * m[0] + n->v[1] * m[1] + n->v[2] * m[2]) * c->normal_scale;
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v->normal.v[1] = (n->v[0] * m[4] + n->v[1] * m[5] + n->v[2] * m[6]) * c->normal_scale;
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v->normal.v[2] = (n->v[0] * m[8] + n->v[1] * m[9] + n->v[2] * m[10]) * c->normal_scale;
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if (c->normalize_enabled) {
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gl_V3_Norm(&v->normal);
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}
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} else {
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/* no eye coordinates needed, no normal */
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/* NOTE: W = 1 is assumed */
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m = &c->matrix_model_projection.m[0][0];
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v->pc.v[0] = (v->coord.v[0] * m[0] + v->coord.v[1] * m[1] +
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v->coord.v[2] * m[2] + m[3]);
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v->pc.v[1] = (v->coord.v[0] * m[4] + v->coord.v[1] * m[5] +
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v->coord.v[2] * m[6] + m[7]);
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v->pc.v[2] = (v->coord.v[0] * m[8] + v->coord.v[1] * m[9] +
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v->coord.v[2] * m[10] + m[11]);
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if (c->matrix_model_projection_no_w_transform) {
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v->pc.v[3] = m[15];
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} else {
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v->pc.v[3] = (v->coord.v[0] * m[12] + v->coord.v[1] * m[13] +
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v->coord.v[2] * m[14] + m[15]);
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}
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}
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v->clip_code = gl_clipcode(v->pc.v[0], v->pc.v[1], v->pc.v[2], v->pc.v[3]);
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}
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