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N64 optimised, stage 5

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UnknownShadow200 2025-04-28 20:18:53 +10:00
parent 4dc90741d7
commit 7db63f8570
1 changed files with 20 additions and 34 deletions
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54
misc/n64/gpu.c
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@ -4,7 +4,6 @@
#include "rdpq_mode.h"
#include "rdpq_debug.h"
#include "display.h"
#include "rdp.h"
#include "gl_constants.h"
// This is a severely cutdown version of libdragon's OpenGL implementation
@ -42,30 +41,16 @@ enum {
GPU_CMD_PRE_INIT_PIPE = 0x8,
};
typedef struct {
float scale[3];
float offset[3];
} gpu_viewport_t;
typedef struct {
int16_t i[4][4];
uint16_t f[4][4];
} gpu_matrix_srv_t;
_Static_assert(sizeof(gpu_matrix_srv_t) == MATRIX_SIZE, "Matrix size does not match");
typedef struct {
rspq_write_t w;
union {
uint8_t bytes[4];
uint32_t word;
};
uint32_t buffer_head;
} gpu_cmd_stream_t;
typedef struct {
gpu_matrix_srv_t mvp_matrix;
int16_t viewport_scale[4];
int16_t viewport_offset[4];
int16_t vp_scale[4];
int16_t vp_offset[4];
uint32_t flags;
uint16_t tex_size[2];
uint16_t tex_offset[2];
@ -120,7 +105,8 @@ static inline void gpu_draw_triangle(int i0, int i1, int i2)
}
static gpu_viewport_t state_viewport;
static float gpu_vp_scale[3];
static float gpu_vp_offset[3];
static bool gpu_texturing;
static void* gpu_pointer;
static int gpu_stride;
@ -232,38 +218,38 @@ static void gpuDrawArrays(uint32_t first, uint32_t count)
static void gpuDepthRange(float n, float f)
{
state_viewport.scale[2] = (f - n) * 0.5f;
state_viewport.offset[2] = n + (f - n) * 0.5f;
gpu_vp_scale[2] = (f - n) * 0.5f;
gpu_vp_offset[2] = n + (f - n) * 0.5f;
gpu_set_short(offsetof(gpu_state, viewport_scale[2]), state_viewport.scale[2] * 4);
gpu_set_short(offsetof(gpu_state, viewport_offset[2]), state_viewport.offset[2] * 4);
gpu_set_short(offsetof(gpu_state, vp_scale[2]), gpu_vp_scale[2] * 4);
gpu_set_short(offsetof(gpu_state, vp_offset[2]), gpu_vp_offset[2] * 4);
}
static void gpuViewport(int x, int y, int w, int h)
{
state_viewport.scale[0] = w * 0.5f;
state_viewport.scale[1] = h * -0.5f;
state_viewport.offset[0] = x + w * 0.5f;
state_viewport.offset[1] = y + h * 0.5f;
gpu_vp_scale[0] = w * 0.5f;
gpu_vp_scale[1] = h * -0.5f;
gpu_vp_offset[0] = x + w * 0.5f;
gpu_vp_offset[1] = y + h * 0.5f;
// Screen coordinates are s13.2
#define SCREEN_XY_SCALE 4.0f
#define SCREEN_Z_SCALE 32767.0f
// * 2.0f to compensate for RSP reciprocal missing 1 bit
uint16_t scale_x = state_viewport.scale[0] * SCREEN_XY_SCALE * 2.0f;
uint16_t scale_y = state_viewport.scale[1] * SCREEN_XY_SCALE * 2.0f;
uint16_t scale_z = state_viewport.scale[2] * SCREEN_Z_SCALE * 2.0f;
uint16_t scale_x = gpu_vp_scale[0] * SCREEN_XY_SCALE * 2.0f;
uint16_t scale_y = gpu_vp_scale[1] * SCREEN_XY_SCALE * 2.0f;
uint16_t scale_z = gpu_vp_scale[2] * SCREEN_Z_SCALE * 2.0f;
uint16_t offset_x = state_viewport.offset[0] * SCREEN_XY_SCALE;
uint16_t offset_y = state_viewport.offset[1] * SCREEN_XY_SCALE;
uint16_t offset_z = state_viewport.offset[2] * SCREEN_Z_SCALE;
uint16_t offset_x = gpu_vp_offset[0] * SCREEN_XY_SCALE;
uint16_t offset_y = gpu_vp_offset[1] * SCREEN_XY_SCALE;
uint16_t offset_z = gpu_vp_offset[2] * SCREEN_Z_SCALE;
gpu_set_long(
offsetof(gpu_state, viewport_scale),
offsetof(gpu_state, vp_scale),
((uint64_t)scale_x << 48) | ((uint64_t)scale_y << 32) | ((uint64_t)scale_z << 16));
gpu_set_long(
offsetof(gpu_state, viewport_offset),
offsetof(gpu_state, vp_offset),
((uint64_t)offset_x << 48) | ((uint64_t)offset_y << 32) | ((uint64_t)offset_z << 16));
}