ref: 1c67d76d6acdb928aca648274b5c53a11b8bada0
dir: /src/zraster.c/
#include "../include/GL/gl.h"
#include "../include/zbuffer.h"
#include "msghandling.h"
#include "zgl.h"
static void gl_vertex_transform_raster(GLVertex* v) {
GLContext* c = gl_get_context();
{
/* no eye coordinates needed, no normal */
/* NOTE: W = 1 is assumed */
GLfloat* m = &c->matrix_model_projection.m[0][0];
v->pc.X = (v->coord.X * m[0] + v->coord.Y * m[1] + v->coord.Z * m[2] + m[3]);
v->pc.Y = (v->coord.X * m[4] + v->coord.Y * m[5] + v->coord.Z * m[6] + m[7]);
v->pc.Z = (v->coord.X * m[8] + v->coord.Y * m[9] + v->coord.Z * m[10] + m[11]);
if (c->matrix_model_projection_no_w_transform) {
v->pc.W = m[15];
} else {
v->pc.W = (v->coord.X * m[12] + v->coord.Y * m[13] + v->coord.Z * m[14] + m[15]);
}
m = &c->matrix_stack_ptr[0]->m[0][0];
v->ec.X = (v->coord.X * m[0] + v->coord.Y * m[1] + v->coord.Z * m[2] + m[3]);
v->ec.Y = (v->coord.X * m[4] + v->coord.Y * m[5] + v->coord.Z * m[6] + m[7]);
v->ec.Z = (v->coord.X * m[8] + v->coord.Y * m[9] + v->coord.Z * m[10] + m[11]);
v->ec.W = (v->coord.X * m[12] + v->coord.Y * m[13] + v->coord.Z * m[14] + m[15]);
}
v->clip_code = gl_clipcode(v->pc.X, v->pc.Y, v->pc.Z, v->pc.W);
}
void glRasterPos4f(GLfloat x, GLfloat y, GLfloat z, GLfloat w) {
GLParam p[5];
p[0].op = OP_RasterPos;
p[1].f = x;
p[2].f = y;
p[3].f = z;
p[4].f = w;
gl_add_op(p);
}
void glopRasterPos(GLParam* p) {
GLContext* c = gl_get_context();
GLVertex v;
v.coord.X = p[1].f;
v.coord.Y = p[2].f;
v.coord.Z = p[3].f;
v.coord.W = p[4].f;
gl_vertex_transform_raster(&v);
if (v.clip_code == 0) {
{
GLfloat winv = 1.0 / v.pc.W;
v.zp.x = (GLint)(v.pc.X * winv * c->viewport.scale.X + c->viewport.trans.X);
v.zp.y = (GLint)(v.pc.Y * winv * c->viewport.scale.Y + c->viewport.trans.Y);
v.zp.z = (GLint)(v.pc.Z * winv * c->viewport.scale.Z + c->viewport.trans.Z);
}
c->rasterpos.v[0] = v.zp.x;
c->rasterpos.v[1] = v.zp.y;
c->rastervertex = v;
/* c->rasterpos.v[2] = v.zp.z;*/
c->rasterpos_zz = v.zp.z >> ZB_POINT_Z_FRAC_BITS;
c->rasterposvalid = 1;
} else
c->rasterposvalid = 0;
}
void glRasterPos2f(GLfloat x, GLfloat y) { glRasterPos4f(x, y, 0, 1); }
void glRasterPos3f(GLfloat x, GLfloat y, GLfloat z) { glRasterPos4f(x, y, z, 1); }
void glRasterPos2fv(GLfloat* v) { glRasterPos2f(v[0], v[1]); }
void glRasterPos3fv(GLfloat* v) { glRasterPos3f(v[0], v[1], v[2]); }
void glRasterPos4fv(GLfloat* v) { glRasterPos4f(v[0], v[1], v[2], v[3]); }
void glDrawPixels(GLsizei width, GLsizei height, GLenum format, GLenum type, void* data) {
/* TODO: Come up with a clever scheme for storing the data to avoid pointer dependency. */
#if TGL_FEATURE_RENDER_BITS == 32
if (type != GL_UNSIGNED_INT && type != GL_UNSIGNED_INT_8_8_8_8) {
tgl_warning("\nERROR: Incorrect type for glDrawPixels. It MUST be GL_UNSIGNED_INT or GL_UNSIGNED_INT_8_8_8_8, A R G B!");
return;
}
#elif TGL_FEATURE_RENDER_BITS == 16
if (type != GL_UNSIGNED_SHORT && type != GL_UNSIGNED_SHORT_5_6_5) {
tgl_warning("\nERROR: Incorrect type for glDrawPixels. it MUST be GL_UNSIGNED_SHORT or GL_UNSIGNED_SHORT_5_6_5, R5 G6 B5!");
return;
}
#else
#error "Bad TGL_FEATURE_RENDER_BITS"
#endif
if (format != GL_RGB) {
tgl_warning("\nERROR: Incorrect format for glDrawPixels.");
return;
}
GLParam p[6];
p[0].op = OP_DrawPixels;
p[1].i = width;
p[2].i = height;
p[3].p = data;
gl_add_op(p);
}
#define ZCMP(z, zpix) (!(zbdt) || z >= (zpix))
#define CLIPTEST(_x, _y, _w, _h) ((0 <= _x) && (_w > _x) && (0 <= _y) && (_h > _y))
void glopDrawPixels(GLParam* p) {
GLContext* c = gl_get_context();
GLint sy, sx, ty, tx;
GLint w = p[1].i;
GLint h = p[2].i;
V4 rastpos = c->rasterpos;
ZBuffer* zb = c->zb;
PIXEL* d = p[3].p;
PIXEL* pbuf = zb->pbuf;
GLushort* zbuf = zb->zbuf;
GLubyte zbdw = zb->depth_write;
GLubyte zbdt = zb->depth_test;
GLint tw = zb->xsize;
GLint th = zb->ysize;
GLfloat pzoomx = c->pzoomx;
GLfloat pzoomy = c->pzoomy;
GLint zz = c->rasterpos_zz;
#if TGL_FEATURE_BLEND_DRAW_PIXELS == 1
TGL_BLEND_VARS
#endif
#if TGL_FEATURE_BLEND == 1
#if TGL_FEATURE_BLEND_DRAW_PIXELS == 1
GLuint zbeb = zb->enable_blend;
#endif
#endif
if (!c->rasterposvalid)return;
#if TGL_FEATURE_ALT_RENDERMODES == 1
if (c->render_mode == GL_SELECT) {
gl_add_select(zz, zz);
return;
} else if (c->render_mode == GL_FEEDBACK) {
gl_add_feedback(GL_DRAW_PIXEL_TOKEN, &(c->rastervertex), NULL, NULL, 0);
return;
}
#endif
#if TGL_FEATURE_MULTITHREADED_DRAWPIXELS == 1
#pragma omp parallel for
for (sy = 0; sy < h; sy++)
for (sx = 0; sx < w; sx++) {
PIXEL col = d[sy * w + sx];
V4 rastoffset;
rastoffset.v[0] = rastpos.v[0] + (GLfloat)sx * pzoomx;
rastoffset.v[1] = rastpos.v[1] - ((GLfloat)(h - sy) * pzoomy);
rastoffset.v[2] = rastoffset.v[0] + pzoomx;
rastoffset.v[3] = rastoffset.v[1] - pzoomy;
for (ty = rastoffset.v[1]; (GLfloat)ty > rastoffset.v[3]; ty--)
for (tx = rastoffset.v[0]; (GLfloat)tx < rastoffset.v[2]; tx++)
if (CLIPTEST(tx, ty, tw, th)) {
GLushort* pz = zbuf + (ty * tw + tx);
if (ZCMP(zz, *pz)) {
#if TGL_FEATURE_BLEND == 1
#if TGL_FEATURE_BLEND_DRAW_PIXELS == 1
if (!zbeb)
pbuf[tx + ty * tw] = col;
else
TGL_BLEND_FUNC(col, pbuf[tx + ty * tw])
#else
pbuf[tx + ty * tw] = col;
#endif
#else
pbuf[tx + ty * tw] = col;
#endif
if (zbdw)
*pz = zz;
}
}
}
#else
for (sy = 0; sy < h; sy++)
for (sx = 0; sx < w; sx++) {
PIXEL col = d[sy * w + sx];
V4 rastoffset;
rastoffset.v[0] = rastpos.v[0] + (GLfloat)sx * pzoomx;
rastoffset.v[1] = rastpos.v[1] - ((GLfloat)(h - sy) * pzoomy);
rastoffset.v[2] = rastoffset.v[0] + pzoomx;
rastoffset.v[3] = rastoffset.v[1] - pzoomy;
for (ty = rastoffset.v[1]; (GLfloat)ty > rastoffset.v[3]; ty--)
for (tx = rastoffset.v[0]; (GLfloat)tx < rastoffset.v[2]; tx++)
if (CLIPTEST(tx, ty, tw, th)) {
GLushort* pz = zbuf + (ty * tw + tx);
if (ZCMP(zz, *pz)) {
#if TGL_FEATURE_BLEND == 1
#if TGL_FEATURE_BLEND_DRAW_PIXELS == 1
if (!zbeb)
pbuf[tx + ty * tw] = col;
else
TGL_BLEND_FUNC(col, pbuf[tx + ty * tw])
#else
pbuf[tx + ty * tw] = col;
#endif
#else
pbuf[tx + ty * tw] = col;
#endif
if (zbdw)
*pz = zz;
}
}
}
#endif
}
void glPixelZoom(GLfloat x, GLfloat y) {
GLParam p[3];
p[0].op = OP_PixelZoom;
p[1].f = x;
p[2].f = y;
gl_add_op(p);
}
void glopPixelZoom(GLParam* p) {
GLContext* c = gl_get_context();
c->pzoomx = p[1].f;
c->pzoomy = p[2].f;
}