266 lines
7.5 KiB
C
266 lines
7.5 KiB
C
#include "io_registers.h"
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#include "bits.h"
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#include "models/icosphere.h"
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#include "math/math.h"
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void main()
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{
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// power control
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io_registers.a.POWCNT = 0
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| POWCNT__lcd_output_destination__a_to_upper__b_to_lower
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| POWCNT__geometry_engine__enable
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| POWCNT__rendering_engine__enable
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| POWCNT__lcd__enable;
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// enable bg0 and 3d graphics
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io_registers.a.DISPCNT = 0
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| DISPCNT__display_mode__graphics_display
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| DISPCNT__bg0__enable
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| DISPCNT__display_selection_for_bg0__3d_graphics
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;
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// disable all 3d effects
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io_registers.a.DISP3DCNT = 0
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| DISP3DCNT__clear_image__disable
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| DISP3DCNT__fog_master__disable
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| DISP3DCNT__edge_marking__disable
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| DISP3DCNT__anti_aliasing__disable
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| DISP3DCNT__alpha_blending__disable
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| DISP3DCNT__alpha_test__disable
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| DISP3DCNT__texture_mapping__disable;
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// clear matrix stack status
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io_registers.a.GXSTAT |= GXSTAT__matrix_stack_status__overflow_or_underflow;
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// load identity matrices
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io_registers.a.MTX_MODE = MTX_MODE__matrix_mode__projection;
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io_registers.a.MTX_IDENTITY = 0;
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/*
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io_registers.a.MTX_SCALE = ((192 << 12) / (256)) / 2;
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io_registers.a.MTX_SCALE = 0.5 * 4096;
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io_registers.a.MTX_SCALE = 0.5 * 4096;
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*/
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// load a symmetric perspective matrix, with aspect ratio correction
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io_registers.a.MTX_LOAD_4X4 = (192 << 12) / 256;
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = 1 << 12;
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = -(1 << 12);
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = 0;
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io_registers.a.MTX_LOAD_4X4 = -(1 << 12);
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io_registers.a.MTX_LOAD_4X4 = 0;
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// translate the viewpoint
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io_registers.a.MTX_TRANS = 0;
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io_registers.a.MTX_TRANS = 0;
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io_registers.a.MTX_TRANS = (int)(-2.1 * (float)(1 << 12));
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io_registers.a.MTX_MODE = MTX_MODE__matrix_mode__position;
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io_registers.a.MTX_IDENTITY = 0;
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io_registers.a.MTX_MODE = MTX_MODE__matrix_mode__position_and_vector;
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io_registers.a.MTX_IDENTITY = 0;
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// set the 3d clear color to a dark red
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io_registers.a.CLEAR_COLOR = 0
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| CLEAR_COLOR__clear_polygon_id(31)
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| CLEAR_COLOR__alpha_value(31)
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| CLEAR_COLOR__blue(1)
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| CLEAR_COLOR__green(1)
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| CLEAR_COLOR__red(10);
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// set the depth buffer clear value to the maximum value
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io_registers.a.CLEAR_DEPTH = CLEAR_DEPTH__value(0x7fff);
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// the following polygons are fully opaque; backface culling is
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// enabled
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io_registers.a.POLYGON_ATTR = 0
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| POLYGON_ATTR__alpha_value(31)
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| POLYGON_ATTR__render_front_surface__enable
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| POLYGON_ATTR__render_back_surface__enable
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| POLYGON_ATTR__light_2__enable
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| POLYGON_ATTR__light_1__enable
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| POLYGON_ATTR__light_0__enable;
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// the 3d viewport is the entire display area
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io_registers.a.VIEWPORT = 0
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| VIEWPORT__y2(191)
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| VIEWPORT__x2(255)
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| VIEWPORT__y1(0)
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| VIEWPORT__x1(0);
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// normalized 45° vector
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int c = 0.57735 * 512;
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// lighting
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io_registers.a.LIGHT_VECTOR = 0
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| LIGHT_VECTOR__light_number(0)
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| LIGHT_VECTOR__decimal_z(-c)
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| LIGHT_VECTOR__decimal_y(-c)
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| LIGHT_VECTOR__decimal_x(-c);
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io_registers.a.LIGHT_VECTOR = 0
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| LIGHT_VECTOR__light_number(1)
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| LIGHT_VECTOR__decimal_z(-c)
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| LIGHT_VECTOR__decimal_y(-c)
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| LIGHT_VECTOR__decimal_x(c);
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io_registers.a.LIGHT_VECTOR = 0
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| LIGHT_VECTOR__light_number(2)
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| LIGHT_VECTOR__decimal_z(-c)
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| LIGHT_VECTOR__decimal_y(c)
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| LIGHT_VECTOR__decimal_x(-c);
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io_registers.a.LIGHT_COLOR = 0
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| LIGHT_COLOR__light_number(0)
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| LIGHT_COLOR__blue(1)
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| LIGHT_COLOR__green(1)
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| LIGHT_COLOR__red(31);
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io_registers.a.LIGHT_COLOR = 0
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| LIGHT_COLOR__light_number(1)
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| LIGHT_COLOR__blue(1)
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| LIGHT_COLOR__green(31)
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| LIGHT_COLOR__red(1);
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io_registers.a.LIGHT_COLOR = 0
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| LIGHT_COLOR__light_number(2)
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| LIGHT_COLOR__blue(31)
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| LIGHT_COLOR__green(1)
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| LIGHT_COLOR__red(1);
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// degrees
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int theta = 0;
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while (1) {
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// calculate sin/cos for 2d rotation; signed fp20.12 result
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int cos = cos_fp12(theta);
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int sin = sin_fp12(theta);
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int cos2 = cos_fp12(theta >> 1);
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int sin2 = sin_fp12(theta >> 1);
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io_registers.a.MTX_MODE = MTX_MODE__matrix_mode__position_and_vector;
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// reset position matrix
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io_registers.a.MTX_IDENTITY = 0;
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// multiply by a z-axis rotation
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io_registers.a.MTX_MULT_3X3 = cos;
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io_registers.a.MTX_MULT_3X3 = -sin;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = sin;
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io_registers.a.MTX_MULT_3X3 = cos;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = 1 << 12;
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// multiply by a y-axis rotation
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io_registers.a.MTX_MULT_3X3 = cos2;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = sin2;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = 1 << 12;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = -sin2;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = cos2;
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// multiply by a x-axis rotation
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io_registers.a.MTX_MULT_3X3 = cos2;
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io_registers.a.MTX_MULT_3X3 = -sin2;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = sin2;
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io_registers.a.MTX_MULT_3X3 = cos2;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = 0;
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io_registers.a.MTX_MULT_3X3 = 1 << 12;
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// cube faces
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io_registers.a.DIF_AMB = 0
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| DIF_AMB__ambient_blue(1)
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| DIF_AMB__ambient_green(1)
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| DIF_AMB__ambient_red(1)
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| DIF_AMB__diffuse_blue(10)
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| DIF_AMB__diffuse_green(10)
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| DIF_AMB__diffuse_red(10);
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io_registers.a.SPE_EMI = 0
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| SPE_EMI__specular_blue(30)
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| SPE_EMI__specular_green(30)
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| SPE_EMI__specular_red(30);
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// the following vertices are a triangles
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io_registers.a.BEGIN_VTXS = BEGIN_VTXS__type__triangle;
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const int num_faces = (sizeof (icosphere_triangles)) / (sizeof (struct triangle));
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for (int i = 0; i < num_faces; i++) {
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struct vertex_normal * an = &icosphere_normals[icosphere_triangles[i].a.normal];
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io_registers.a.NORMAL = 0
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| NORMAL__z_component(an->z)
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| NORMAL__y_component(an->y)
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| NORMAL__x_component(an->x);
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struct vertex_position * a = &icosphere_positions[icosphere_triangles[i].a.position];
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io_registers.a.VTX_10 = 0
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| VTX_10__z_coordinate(a->z)
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| VTX_10__y_coordinate(a->y)
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| VTX_10__x_coordinate(a->x);
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struct vertex_position * b = &icosphere_positions[icosphere_triangles[i].b.position];
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io_registers.a.VTX_10 = 0
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| VTX_10__z_coordinate(b->z)
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| VTX_10__y_coordinate(b->y)
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| VTX_10__x_coordinate(b->x);
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struct vertex_position * c = &icosphere_positions[icosphere_triangles[i].c.position];
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io_registers.a.VTX_10 = 0
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| VTX_10__z_coordinate(c->z)
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| VTX_10__y_coordinate(c->y)
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| VTX_10__x_coordinate(c->x);
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}
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// end of the quadrilateral
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io_registers.a.END_VTXS = 0;
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// wait for the end of the current frame
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while (io_registers.a.VCOUNT != 262);
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while (io_registers.a.VCOUNT == 262);
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// wait for the geometry engine
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while (io_registers.a.GXSTAT & GXSTAT__geometry_engine_busy);
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// swap buffers
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io_registers.a.SWAP_BUFFERS = 0;
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// increment theta once per frame
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theta += 1;
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if (theta >= 360 * 2) {
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theta = 0;
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}
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}
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}
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