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Finish chapter: The GTE Coprocessor.

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This commit is contained in:
Edward R. Gonzalez
2026-03-28 12:51:29 -04:00
parent b846c697c6
commit d1919137a3
8 changed files with 135 additions and 51 deletions
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code/graphics_hello_psyq/hello_gpu.c
+62 -9
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@@ -11,6 +11,8 @@
#include "duffle/gp.h"
#include "hello_gpu.h"
#define GTE_Coprocessor_Chapter 1
typedef def_farray(V2_S2, 3);
typedef def_struct(Poly_F3) {
U4 tag;
@@ -73,12 +75,22 @@ typedef def_struct(PrimitiveArena) {
U4 used;
};
#define Cube_num_verts 8
#define Cube_num_faces 12
typedef def_farray(V3_S2, Cube_num_verts);
typedef def_farray(V3_S2, Cube_num_faces);
#define GTE_Coprocessor_UseQuads 1
#define GTE_Coprocessor_UseTris 0
void cube128_init(A8_V3_S2* verts, A12_V3_S2* faces) {
#define Cube_num_verts 8
typedef def_farray(V3_S2, Cube_num_verts);
#if GTE_Coprocessor_UseTris
#define Cube_num_faces 12
typedef def_farray(V3_S2, Cube_num_faces)
typedef A12_V3_S2 ACubeFaces;
#endif
#if GTE_Coprocessor_UseQuads
#define Cube_num_faces 6
typedef def_farray(V4_S2, Cube_num_faces);
typedef A6_V4_S2 ACubeFaces;
#endif
void cube128_init(A8_V3_S2* verts, ACubeFaces* faces) {
memory_copy(verts, & (A8_V3_S2) {
{ -128, -128, -128 },
{ 128, -128, -128 },
@@ -91,6 +103,7 @@ void cube128_init(A8_V3_S2* verts, A12_V3_S2* faces) {
},
size_of(A8_V3_S2)
);
#if GTE_Coprocessor_UseTris
memory_copy(faces, & (A12_V3_S2) {
{ 0, 3, 2 }, // top
{ 0, 2, 1 }, // top
@@ -107,6 +120,19 @@ void cube128_init(A8_V3_S2* verts, A12_V3_S2* faces) {
},
size_of(A12_V3_S2)
);
#endif
#if GTE_Coprocessor_UseQuads
memory_copy(faces, & (A6_V4_S2) {
{ 3, 2, 0, 1 },
{ 0, 1, 4, 5 },
{ 4, 5, 7, 6 },
{ 1, 2, 5, 6 },
{ 2, 3, 6, 7 },
{ 3, 0, 7, 4 },
},
sizeof(A6_V4_S2)
);
#endif
return;
}
@@ -122,8 +148,8 @@ typedef def_struct(SMemory) {
M3_S2 tform_world;
A8_V3_S2 cube_verts;
A12_V3_S2 cube_faces;
A8_V3_S2 cube_verts;
ACubeFaces cube_faces;
};
global SMemory static_mem;
extern SMemory static_mem;
@@ -195,7 +221,7 @@ void update(PrimitiveArena* pa, U4* ordering_buf)
gte_matrix_set_rotation (& static_mem.tform_world);
gte_matrix_set_translation(& static_mem.tform_world);
#if 1
#if GTE_Coprocessor_Chapter
S4 nclip = 0;
S4 orderingtbl_z = 0;
A2_S2 p; //???
@@ -203,6 +229,7 @@ void update(PrimitiveArena* pa, U4* ordering_buf)
for (U4 face_id = 0; face_id < Cube_num_faces; face_id += 1)
{
#if GTE_Coprocessor_UseTris
Poly_G3* tri = prim_alloc(Poly_G3); set_poly_g3(tri);
tri->c0 = rgb8(255, 0, 255);
tri->c1 = rgb8(255, 255, 0);
@@ -231,8 +258,34 @@ void update(PrimitiveArena* pa, U4* ordering_buf)
if ((orderingtbl_z > 0) && (orderingtbl_z < OrderingTbl_Len)) {
orderingtbl_add_primitive(ordering_buf[orderingtbl_z], tri);
}
}
#endif
#if GTE_Coprocessor_UseQuads
Poly_G4* quad = prim_alloc(Poly_G4); set_poly_g4(quad);
quad->c0 = rgb8(255, 0, 255);
quad->c1 = rgb8(255, 255, 0);
quad->c2 = rgb8( 0, 255, 255);
quad->c3 = rgb8( 0, 255, 0);
V4_S2* face = & static_mem.cube_faces[face_id];
V3_S2* p0 = & static_mem.cube_verts[face->x];
V3_S2* p1 = & static_mem.cube_verts[face->y];
V3_S2* p2 = & static_mem.cube_verts[face->z];
V3_S2* p3 = & static_mem.cube_verts[face->w];
nclip = rtp_avg_nclip_a4_v3s2(
p0, p1, p2, p3,
& quad->p0, & quad->p1, & quad->p2, & quad->p3,
& p, & orderingtbl_z, & flag
);
if (nclip <= 0) {
continue;
}
if ((orderingtbl_z > 0) && (orderingtbl_z < OrderingTbl_Len)) {
orderingtbl_add_primitive(ordering_buf[orderingtbl_z], quad);
}
#endif
}
static_mem.rotation.x += 6;
static_mem.rotation.y += 8;
static_mem.rotation.z += 12;