draw3d.c File Reference

#include <gif_tags.h>
#include <gs_gp.h>
#include <gs_privileged.h>
#include <draw.h>

Include dependency graph for draw3d.c:

Go to the source code of this file.

Functions
qword_t *	draw_prim_start (qword_t *q, int context, prim_t *prim, color_t *color)
qword_t *	draw_prim_end (qword_t *q, int nreg, u64 reglist)
int	draw_convert_rgbq (color_t *output, int count, vertex_f_t *vertices, color_f_t *colours, unsigned char alpha)
int	draw_convert_rgbaq (color_t *output, int count, vertex_f_t *vertices, color_f_t *colours)
int	draw_convert_st (texel_t *output, int count, vertex_f_t *vertices, texel_f_t *coords)
int	draw_convert_xyz (xyz_t *output, float x, float y, int z, int count, vertex_f_t *vertices)

Variables
static qword_t *	__prim_start = NULL

Function Documentation

draw_convert_rgbaq()

int draw_convert_rgbaq	(	color_t *	output,
		int	count,
		vertex_f_t *	vertices,
		color_f_t *	colours
	)

Converts floating point color and calculates q value

Definition at line 88 of file draw3d.c.

{
 
        int i;
        float q = 1.00f;
 
        // For each colour...
        for (i=0;i<count;i++)
        {
 
                // Calculate the Q value.
                if (vertices[i].w != 0)
                {
 
                        q = 1 / vertices[i].w;
 
                }
 
                // Calculate the RGBA values.
                output[i].r = (int)(colours[i].r * 128.0f);
                output[i].g = (int)(colours[i].g * 128.0f);
                output[i].b = (int)(colours[i].b * 128.0f);
                output[i].a = (int)(colours[i].a * 128.0f);
                output[i].q = q;
 
        }
 
        // End function.
        return 0;
 
}

References color_t::a, color_t::b, colours, color_t::g, color_t::q, color_t::r, and vertices.

draw_convert_rgbq()

int draw_convert_rgbq	(	color_t *	output,
		int	count,
		vertex_f_t *	vertices,
		color_f_t *	colours,
		unsigned char	alpha
	)

Converts floating point color, replacing alpha with constant value, and calculates q

Definition at line 56 of file draw3d.c.

{
 
        int i;
        float q = 1.00f;
 
        // For each colour...
        for (i=0;i<count;i++)
        {
 
                // Calculate the Q value.
                if (vertices[i].w != 0)
                {
 
                        q = 1 / vertices[i].w;
 
                }
 
                // Calculate the RGBA values.
                output[i].r = (int)(colours[i].r * 128.0f);
                output[i].g = (int)(colours[i].g * 128.0f);
                output[i].b = (int)(colours[i].b * 128.0f);
                output[i].a = alpha;
                output[i].q = q;
 
        }
 
        // End function.
        return 0;
 
}

References color_t::a, color_t::b, colours, color_t::g, color_t::q, color_t::r, and vertices.

Referenced by render(), and render_teapot().

draw_convert_st()

int draw_convert_st	(	texel_t *	output,
		int	count,
		vertex_f_t *	vertices,
		texel_f_t *	coords
	)

Calculates the st coordinates from the perspective coordinate q = 1/w

Definition at line 120 of file draw3d.c.

{
 
        int i = 0;
        float q = 1.00f;
 
        // For each coordinate...
        for (i=0;i<count;i++)
        {
 
                // Calculate the Q value.
                if (vertices[i].w != 0)
                {
                        q = 1 / vertices[i].w;
                }
 
                // Calculate the S and T values.
                output[i].s = coords[i].s * q;
                output[i].t = coords[i].t * q;
 
        }
 
        // End function.
        return 0;
 
}

References texel_t::s, texel_f_t::s, texel_t::t, texel_f_t::t, and vertices.

Referenced by render().

draw_convert_xyz()

int draw_convert_xyz	(	xyz_t *	output,
		float	x,
		float	y,
		int	z,
		int	count,
		vertex_f_t *	vertices
	)

Converts and translates floating point vertices to fixed point vertices

Definition at line 147 of file draw3d.c.

{
 
        int i;
 
        int center_x;
        int center_y;
 
        unsigned int max_z;
 
        center_x = ftoi4(x);
        center_y = ftoi4(y);
 
        max_z = 1 << (z - 1);
 
        // For each colour...
        for (i=0;i<count;i++)
        {
 
                // Calculate the XYZ values.
                output[i].x = (short)((vertices[i].x + 1.0f) * center_x);
                output[i].y = (short)((vertices[i].y + 1.0f) * -center_y);
                output[i].z = (unsigned int)((vertices[i].z + 1.0f) * max_z);
 
        }
 
        // End function.
        return 0;
 
}

References ftoi4, vertices, xyz_t::x, x, xyz_t::y, y, and xyz_t::z.

Referenced by render(), and render_teapot().

draw_prim_end()

qword_t* draw_prim_end	(	qword_t *	q,
		int	nreg,
		u64	reglist
	)

Ends a primitive by calculating the number of qwords used, the number of registers, the register list

Definition at line 33 of file draw3d.c.

{
 
        u32 vertex_qwords;
        u32 vertex_loops;
 
        // Determine number qwords that were needed minus the reglist giftag
        vertex_qwords = q - __prim_start - 1;
 
        // Determine number of loops based on qwords used and number of regs per loop
        vertex_loops = (vertex_qwords * 2) / nreg;
 
        // Now set the giftag of the vertex reglist chain
        __prim_start->dw[0] = GIF_SET_TAG(vertex_loops,1,0,0,GIF_FLG_REGLIST,nreg);
 
        // Set the higher 64bits to the reglist
        __prim_start->dw[1] = reglist;
 
        // Return the current qword pointer
        return q;
 
}

References __prim_start, qword_t::dw, GIF_FLG_REGLIST, and GIF_SET_TAG.

Referenced by fontstudio_print_string(), fontx_print_ascii(), fontx_print_sjis(), render(), and render_teapot().

draw_prim_start()

qword_t* draw_prim_start	(	qword_t *	q,
		int	context,
		prim_t *	prim,
		color_t *	color
	)

Begins a primitive, allowing for vertex data to be filled in the packet directly

Definition at line 11 of file draw3d.c.

{
 
        // Set the primitive register in packed mode, but don't end the packet
        PACK_GIFTAG(q,GIF_SET_TAG(2,0,0,0,GIF_FLG_PACKED,1),GIF_REG_AD);
        q++;
        PACK_GIFTAG(q,GS_SET_PRIM(prim->type,prim->shading,prim->mapping,prim->fogging,
                                                          prim->blending,prim->antialiasing,prim->mapping_type,
                                                          context,prim->colorfix),GS_REG_PRIM);
        q++;
        PACK_GIFTAG(q,color->rgbaq,GIF_REG_RGBAQ);
        q++;
 
        // Save the position for the reglist giftag that draw_primitive_end will add
        __prim_start = q;
        q++;
 
        // Return the current qword pointer
        return q;
 
}

References __prim_start, prim_t::antialiasing, prim_t::blending, prim_t::colorfix, context, prim_t::fogging, GIF_FLG_PACKED, GIF_REG_AD, GIF_REG_RGBAQ, GIF_SET_TAG, GS_REG_PRIM, GS_SET_PRIM, prim_t::mapping, prim_t::mapping_type, PACK_GIFTAG, prim, color_t::rgbaq, prim_t::shading, and prim_t::type.

Referenced by fontstudio_print_string(), fontx_print_ascii(), fontx_print_sjis(), render(), and render_teapot().

Variable Documentation

__prim_start

qword_t* __prim_start = NULL

static

Definition at line 9 of file draw3d.c.

Referenced by draw_prim_end(), and draw_prim_start().