ref: 5a4e2a659d7f460b962909e49b524d8292c96728
dir: /src/zraster.c/
#include "../include/GL/gl.h" #include "../include/zbuffer.h" #include "zgl.h" #include "msghandling.h" static inline void gl_vertex_transform_raster(GLContext* c, GLVertex* v) { { /* 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]); } } 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(GLContext* c, GLParam* p){ 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(c, &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->rasterpos.v[2] = v.zp.z; 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 CLIPTEST(_x,_y,_w,_h)((0<=_x) && (_w>_x) && (0<=_y) && (_h>_y)) void glopDrawPixels(GLContext* c, GLParam* p){ // p[3] if(!c->rasterposvalid) return; GLint w = p[1].i; GLint h = p[2].i; V3 rastpos = c->rasterpos; PIXEL* d = p[3].p; PIXEL* pbuf = c->zb->pbuf; GLint tw = c->zb->xsize; GLint th = c->zb->ysize; GLfloat pzoomx = c->pzoomx; GLfloat pzoomy = c->pzoomy; V4 rastoffset; rastoffset.v[0] = rastpos.v[0]; rastoffset.v[1] = rastpos.v[1]; //Looping over the source pixels. for(GLint sx = 0; sx < w; sx++) for(GLint sy = 0; sy < h; sy++) { PIXEL col = d[sy*w+sx]; 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(GLint tx = rastoffset.v[0]; (GLfloat)tx < rastoffset.v[2];tx++) for(GLint ty = rastoffset.v[1]; (GLfloat)ty > rastoffset.v[3];ty--) if(CLIPTEST(tx,ty,tw,th)) pbuf[tx+ty*tw] = col; } /*GLint mult = textsize; for (GLint i = 0; i < mult; i++) for (GLint j = 0; j < mult; j++) glPlotPixel(y * mult + i + _x, x * mult + j + _y, p); */ } 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(GLContext* c, GLParam* p){ c->pzoomx = p[1].f; c->pzoomy = p[2].f; }