cube.c File Reference

#include <kernel.h>
#include <stdlib.h>
#include <tamtypes.h>
#include <math3d.h>
#include <packet.h>
#include <dma_tags.h>
#include <gif_tags.h>
#include <gs_psm.h>
#include <dma.h>
#include <graph.h>
#include <draw.h>
#include <draw3d.h>
#include "mesh_data.c"

Include dependency graph for cube.c:

Go to the source code of this file.

Functions
void	init_gs (framebuffer_t *frame, zbuffer_t *z)
void	init_drawing_environment (framebuffer_t *frame, zbuffer_t *z)
int	render (framebuffer_t *frame, zbuffer_t *z)
int	main (int argc, char **argv)

Variables
VECTOR	object_position = { 0.00f, 0.00f, 0.00f, 1.00f }
VECTOR	object_rotation = { 0.00f, 0.00f, 0.00f, 1.00f }
VECTOR	camera_position = { 0.00f, 0.00f, 100.00f, 1.00f }
VECTOR	camera_rotation = { 0.00f, 0.00f, 0.00f, 1.00f }

Function Documentation

init_drawing_environment()

void init_drawing_environment	(	framebuffer_t *	frame,
		zbuffer_t *	z
	)

Definition at line 60 of file cube.c.

{
 
        packet_t *packet = packet_init(16,PACKET_NORMAL);
 
        // This is our generic qword pointer.
        qword_t *q = packet->data;
 
        // This will setup a default drawing environment.
        q = draw_setup_environment(q,0,frame,z);
 
        // Now reset the primitive origin to 2048-width/2,2048-height/2.
        q = draw_primitive_xyoffset(q,0,(2048-320),(2048-256));
 
        // Finish setting up the environment.
        q = draw_finish(q);
 
        // Now send the packet, no need to wait since it's the first.
        dma_channel_send_normal(DMA_CHANNEL_GIF,packet->data,q - packet->data, 0, 0);
        dma_wait_fast();
 
        packet_free(packet);
 
}

References packet_t::data, DMA_CHANNEL_GIF, dma_channel_send_normal(), dma_wait_fast(), draw_finish(), draw_primitive_xyoffset(), draw_setup_environment(), packet, packet_free(), packet_init(), and PACKET_NORMAL.

Referenced by main().

init_gs()

void init_gs	(	framebuffer_t *	frame,
		zbuffer_t *	z
	)

Definition at line 38 of file cube.c.

{
 
        // Define a 32-bit 640x512 framebuffer.
        frame->width = 640;
        frame->height = 512;
        frame->mask = 0;
        frame->psm = GS_PSM_32;
        frame->address = graph_vram_allocate(frame->width,frame->height, frame->psm, GRAPH_ALIGN_PAGE);
 
        // Enable the zbuffer.
        z->enable = DRAW_ENABLE;
        z->mask = 0;
        z->method = ZTEST_METHOD_GREATER_EQUAL;
        z->zsm = GS_ZBUF_32;
        z->address = graph_vram_allocate(frame->width,frame->height,z->zsm, GRAPH_ALIGN_PAGE);
 
        // Initialize the screen and tie the first framebuffer to the read circuits.
        graph_initialize(frame->address,frame->width,frame->height,frame->psm,0,0);
 
}

References framebuffer_t::address, zbuffer_t::address, DRAW_ENABLE, zbuffer_t::enable, GRAPH_ALIGN_PAGE, graph_initialize(), graph_vram_allocate(), GS_PSM_32, GS_ZBUF_32, framebuffer_t::height, framebuffer_t::mask, zbuffer_t::mask, zbuffer_t::method, framebuffer_t::psm, framebuffer_t::width, zbuffer_t::zsm, and ZTEST_METHOD_GREATER_EQUAL.

Referenced by main().

main()

int main	(	int	argc,
		char **	argv
	)

Definition at line 222 of file cube.c.

{
 
        // The buffers to be used.
        framebuffer_t frame;
        zbuffer_t z;
 
        // Init GIF dma channel.
        dma_channel_initialize(DMA_CHANNEL_GIF,NULL,0);
        dma_channel_fast_waits(DMA_CHANNEL_GIF);
 
        // Init the GS, framebuffer, and zbuffer.
        init_gs(&frame, &z);
 
        // Init the drawing environment and framebuffer.
        init_drawing_environment(&frame,&z);
 
        // Render the cube
        render(&frame,&z);
 
        // Sleep
        SleepThread();
 
        // End program.
        return 0;
 
}

References dma_channel_fast_waits(), DMA_CHANNEL_GIF, dma_channel_initialize(), init_drawing_environment(), init_gs(), NULL, render(), and SleepThread().

render()

int render	(	framebuffer_t *	frame,
		zbuffer_t *	z
	)

Definition at line 85 of file cube.c.

{
 
        int i;
        int context = 0;
 
        // Matrices to setup the 3D environment and camera
        MATRIX local_world;
        MATRIX world_view;
        MATRIX view_screen;
        MATRIX local_screen;
 
        VECTOR *temp_vertices;
 
        prim_t prim;
        color_t color;
 
        xyz_t   *verts;
        color_t *colors;
 
        // The data packets for double buffering dma sends.
        packet_t *packets[2];
        packet_t *current;
        qword_t *q;
        qword_t *dmatag;
 
        packets[0] = packet_init(100,PACKET_NORMAL);
        packets[1] = packet_init(100,PACKET_NORMAL);
 
        // Allocate calculation space.
        temp_vertices = memalign(128, sizeof(VECTOR) * vertex_count);
 
        // Allocate register space.
        verts  = memalign(128, sizeof(vertex_t) * vertex_count);
        colors = memalign(128, sizeof(color_t)  * vertex_count);
 
        // Define the triangle primitive we want to use.
        prim.type = PRIM_TRIANGLE;
        prim.shading = PRIM_SHADE_GOURAUD;
        prim.mapping = DRAW_DISABLE;
        prim.fogging = DRAW_DISABLE;
        prim.blending = DRAW_DISABLE;
        prim.antialiasing = DRAW_ENABLE;
        prim.mapping_type = PRIM_MAP_ST;
        prim.colorfix = PRIM_UNFIXED;
 
        color.r = 0x80;
        color.g = 0x80;
        color.b = 0x80;
        color.a = 0x80;
        color.q = 1.0f;
 
        // Create the view_screen matrix.
        create_view_screen(view_screen, graph_aspect_ratio(), -3.00f, 3.00f, -3.00f, 3.00f, 1.00f, 2000.00f);
 
        // Wait for any previous dma transfers to finish before starting.
        dma_wait_fast();
 
        // The main loop...
        for (;;)
        {
 
                current = packets[context];
 
                // Spin the cube a bit.
                object_rotation[0] += 0.008f; //while (object_rotation[0] > 3.14f) { object_rotation[0] -= 6.28f; }
                object_rotation[1] += 0.012f; //while (object_rotation[1] > 3.14f) { object_rotation[1] -= 6.28f; }
 
                // Create the local_world matrix.
                create_local_world(local_world, object_position, object_rotation);
 
                // Create the world_view matrix.
                create_world_view(world_view, camera_position, camera_rotation);
 
                // Create the local_screen matrix.
                create_local_screen(local_screen, local_world, world_view, view_screen);
 
                // Calculate the vertex values.
                calculate_vertices(temp_vertices, vertex_count, vertices, local_screen);
 
                // Convert floating point vertices to fixed point and translate to center of screen.
                draw_convert_xyz(verts, 2048, 2048, 32, vertex_count, (vertex_f_t*)temp_vertices);
 
                // Convert floating point colours to fixed point.
                draw_convert_rgbq(colors, vertex_count, (vertex_f_t*)temp_vertices, (color_f_t*)colours, 0x80);
 
                // Grab our dmatag pointer for the dma chain.
                dmatag = current->data;
 
                // Now grab our qword pointer and increment past the dmatag.
                q = dmatag;
                q++;
 
                // Clear framebuffer but don't update zbuffer.
                q = draw_disable_tests(q,0,z);
                q = draw_clear(q,0,2048.0f-320.0f,2048.0f-256.0f,frame->width,frame->height,0x00,0x00,0x00);
                q = draw_enable_tests(q,0,z);
 
                // Draw the triangles using triangle primitive type.
                q = draw_prim_start(q,0,&prim, &color);
 
                for(i = 0; i < points_count; i++)
                {
                        q->dw[0] = colors[points[i]].rgbaq;
                        q->dw[1] = verts[points[i]].xyz;
                        q++;
                }
 
                q = draw_prim_end(q,2,DRAW_RGBAQ_REGLIST);
 
                // Setup a finish event.
                q = draw_finish(q);
 
                // Define our dmatag for the dma chain.
                DMATAG_END(dmatag,(q-current->data)-1,0,0,0);
 
                // Now send our current dma chain.
                dma_wait_fast();
                dma_channel_send_chain(DMA_CHANNEL_GIF,current->data, q - current->data, 0, 0);
 
                // Now switch our packets so we can process data while the DMAC is working.
                context ^= 1;
 
                // Wait for scene to finish drawing
                draw_wait_finish();
 
                graph_wait_vsync();
 
        }
 
        packet_free(packets[0]);
        packet_free(packets[1]);
 
        return 0;
 
}

References color_t::a, prim_t::antialiasing, color_t::b, prim_t::blending, calculate_vertices(), camera_position, camera_rotation, prim_t::colorfix, colours, context, create_local_screen(), create_local_world(), create_view_screen(), create_world_view(), packet_t::data, DMA_CHANNEL_GIF, dma_channel_send_chain(), dma_wait_fast(), DMATAG_END, draw_clear(), draw_convert_rgbq(), draw_convert_xyz(), DRAW_DISABLE, draw_disable_tests(), DRAW_ENABLE, draw_enable_tests(), draw_finish(), draw_prim_end(), draw_prim_start(), DRAW_RGBAQ_REGLIST, draw_wait_finish(), qword_t::dw, prim_t::fogging, color_t::g, graph_aspect_ratio(), graph_wait_vsync(), framebuffer_t::height, local_screen, local_world, prim_t::mapping, prim_t::mapping_type, object_position, object_rotation, packet_free(), packet_init(), PACKET_NORMAL, packets, points, points_count, prim, PRIM_MAP_ST, PRIM_SHADE_GOURAUD, PRIM_TRIANGLE, PRIM_UNFIXED, color_t::q, color_t::r, color_t::rgbaq, prim_t::shading, temp_vertices, prim_t::type, vertex_count, vertices, view_screen, framebuffer_t::width, world_view, and xyz_t::xyz.

Referenced by main().

Variable Documentation

camera_position

VECTOR camera_position = { 0.00f, 0.00f, 100.00f, 1.00f }

Definition at line 35 of file cube.c.

Referenced by render().

camera_rotation

VECTOR camera_rotation = { 0.00f, 0.00f, 0.00f, 1.00f }

Definition at line 36 of file cube.c.

Referenced by render().

object_position

VECTOR object_position = { 0.00f, 0.00f, 0.00f, 1.00f }

Definition at line 32 of file cube.c.

Referenced by render(), and render_teapot().

object_rotation

VECTOR object_rotation = { 0.00f, 0.00f, 0.00f, 1.00f }

Definition at line 33 of file cube.c.

Referenced by render(), and render_teapot().