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libretro.c
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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "osint.h"
#include "vecx.h"
#include "e8910.h"
#include "e6809.h"
#include "libretro.h"
#include "libretro_core_options.h"
#ifdef HAS_GPU
#include "dots.h"
#include "glsym/glsym.h"
#endif
retro_log_printf_t log_cb;
#define STANDARD_BIOS
#ifdef STANDARD_BIOS
#include "bios/system.h"
#else
#ifdef FAST_BIOS
#include "bios/fast.h"
#else
#include "bios/skip.h"
#endif
#endif
static int WIDTH = 330;
static int HEIGHT = 410;
static float SHIFTX = 0;
static float SHIFTY = 0;
static float SCALEX = 1.;
static float SCALEY = 1.;
#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
#ifdef HAS_GPU
#if defined(HAVE_PSGL)
#define RARCH_GL_FRAMEBUFFER GL_FRAMEBUFFER_OES
#define RARCH_GL_FRAMEBUFFER_COMPLETE GL_FRAMEBUFFER_COMPLETE_OES
#define RARCH_GL_COLOR_ATTACHMENT0 GL_COLOR_ATTACHMENT0_EXT
#elif defined(OSX_PPC)
#define RARCH_GL_FRAMEBUFFER GL_FRAMEBUFFER_EXT
#define RARCH_GL_FRAMEBUFFER_COMPLETE GL_FRAMEBUFFER_COMPLETE_EXT
#define RARCH_GL_COLOR_ATTACHMENT0 GL_COLOR_ATTACHMENT0_EXT
#else
#define RARCH_GL_FRAMEBUFFER GL_FRAMEBUFFER
#define RARCH_GL_FRAMEBUFFER_COMPLETE GL_FRAMEBUFFER_COMPLETE
#define RARCH_GL_COLOR_ATTACHMENT0 GL_COLOR_ATTACHMENT0
#endif
static struct retro_hw_render_callback hw_render;
#endif
#if defined(_3DS) || defined(RETROFW)
#define BUFSZ 135300
#else
#define BUFSZ 2164800
#endif
static retro_video_refresh_t video_cb;
static retro_input_poll_t poll_cb;
static retro_input_state_t input_state_cb;
static retro_environment_t environ_cb;
static retro_audio_sample_t audio_cb;
static unsigned char point_size;
static unsigned short framebuffer[BUFSZ];
#ifdef HAS_GPU
static bool usingHWContext = false;
static GLuint ProgramID;
static GLuint mvpMatrixLocation;
static GLuint positionAttribLocation;
static GLuint offsetAttribLocation;
static GLuint colourAttribLocation;
static GLuint packedTexCoordsAttribLocation;
static GLuint textureLocation;
static GLuint scaleLocation;
static GLuint brightnessLocation;
static GLuint DotTextureID;
static GLuint BloomTextureID;
static GLuint vbo;
GLfloat mvp_matrix[16];
typedef struct
{
uint32_t pos;
union
{
uint32_t rest;
struct
{
uint16_t offsets;
GLbyte colour;
GLubyte packedTexCoords;
};
};
} GLVERTEX;
#define MAX_VECTORS 50000
static GLVERTEX vertices[MAX_VECTORS * 18];
static const float dotScale = 1.0f;
static float lineWidth = 75.0f;
static float lineBrightness = 216.0f;
static float bloomWidthMultiplier = 8.0f;
static float maxAlpha = 0.2f;
static const float bloomBrightness = 200.0f;
typedef struct
{
float x;
float y;
} VECX_POINT;
#endif
extern unsigned char vecx_ram[1024];
/* Empty stubs */
void retro_set_controller_port_device(unsigned port, unsigned device) {}
void retro_cheat_reset(void) {}
void retro_cheat_set(unsigned index, bool enabled, const char *code){}
void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) {}
unsigned retro_get_region(void) { return RETRO_REGION_PAL; }
unsigned retro_api_version(void) { return RETRO_API_VERSION; }
bool retro_load_game_special(unsigned game_type, const struct retro_game_info *info, size_t num_info) { return false; }
void retro_deinit(void) { }
void *retro_get_memory_data(unsigned id)
{
if ( id == RETRO_MEMORY_SYSTEM_RAM )
return vecx_ram;
return NULL;
}
size_t retro_get_memory_size(unsigned id)
{
if ( id == RETRO_MEMORY_SYSTEM_RAM )
return 1024;
return 0;
}
/* setters */
void retro_set_environment(retro_environment_t cb)
{
environ_cb = cb;
libretro_set_core_options(environ_cb);
}
void retro_set_video_refresh(retro_video_refresh_t cb) { video_cb = cb; }
void retro_set_audio_sample(retro_audio_sample_t cb) { audio_cb = cb; }
void retro_set_input_poll(retro_input_poll_t cb) { poll_cb = cb; }
void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
void retro_get_system_info(struct retro_system_info *info)
{
memset(info, 0, sizeof(*info));
info->library_name = "VecX";
#ifndef GIT_VERSION
#define GIT_VERSION ""
#endif
info->library_version = "1.2" GIT_VERSION;
info->need_fullpath = false;
info->valid_extensions = "bin|vec";
}
void retro_get_system_av_info(struct retro_system_av_info *info)
{
memset(info, 0, sizeof(*info));
info->timing.fps = 50.0;
info->timing.sample_rate = 44100;
info->geometry.base_width = 330;
info->geometry.base_height = 410;
#if defined(_3DS) || defined(RETROFW)
info->geometry.max_width = 330;
info->geometry.max_height = 410;
#else
info->geometry.max_width = 2048;
info->geometry.max_height = 2048;
#endif
info->geometry.aspect_ratio = 33.0 / 41.0;
}
#ifdef HAS_GPU
#define POINT_NEAR (-1.0f)
#define POINT_FAR (1.0f)
static void make_mvp_matrix(float mvp_mat[16],
float left, float bottom, float right, float top)
{
int i;
for (i=0; i<16; i++)
mvp_mat[i] = 0;
mvp_mat[0] = 2.0f/(right-left);
mvp_mat[3] = -(right+left)/(right-left);
mvp_mat[5] = 2.0f/(top-bottom);
mvp_mat[7] = -(top+bottom)/(top-bottom);
mvp_mat[10] = -2.0f/(POINT_FAR - POINT_NEAR);
mvp_mat[11] = -(POINT_FAR + POINT_NEAR)/(POINT_FAR - POINT_NEAR);
mvp_mat[15] = 1.0f;
}
static void create_gl_image(
uint32_t width, uint32_t height, const uint8_t *data, GLuint *textureId)
{
GLenum err;
glGenTextures(1, textureId);
if ((err = glGetError()))
log_cb(RETRO_LOG_ERROR, "Error generating GL texture: %x\n", err);
glBindTexture(GL_TEXTURE_2D, *textureId);
if ((err = glGetError()))
log_cb(RETRO_LOG_ERROR, "Error binding GL texture: %x\n", err);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, width, height, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
if ((err = glGetError()))
log_cb(RETRO_LOG_ERROR, "Error loading GL texture: %x\n", err);
}
static void compile_gl_program(void)
{
const GLchar *vertexShaderSource[] = {
"attribute vec2 position;\n"
"attribute vec2 offset;\n"
"attribute float colour;\n"
"attribute float packedTexCoords;\n"
"uniform mat4 mvpMatrix;\n"
"uniform float scale;\n"
"uniform float brightness;\n"
"varying float fragColour;\n"
"varying vec2 fragTexCoords;\n"
" void main()\n"
"{\n"
" vec2 pos = position + (offset / 64.0) * scale * (colour / 255.0 + 0.5);\n"
" fragColour = colour * brightness / (127.0 * 255.0);\n"
" float tx = floor(packedTexCoords * 0.0625);\n" /* RPI gets upset if we divide by 16 so multiply by 1/16 instead. */
" float ty = packedTexCoords - tx * 16.0;\n"
" fragTexCoords = vec2(tx, ty) / 2.0;\n"
" gl_Position = vec4(pos, 0.0, 1.0) * mvpMatrix;\n"
"}\n"
};
const char *fragmentShaderSource[] = {
"#ifdef GL_ES\n"
"precision mediump float;\n"
"#endif\n"
"uniform sampler2D texture;\n"
"varying float fragColour;\n"
"varying vec2 fragTexCoords;\n"
"void main()\n"
"{\n"
" vec4 colour = texture2D(texture, fragTexCoords).rgbr;\n"
" colour *= fragColour;\n"
" gl_FragColor = colour;\n"
"}\n"
};
ProgramID = glCreateProgram();
GLuint vert = glCreateShader(GL_VERTEX_SHADER);
GLuint frag = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vert, ARRAY_SIZE(vertexShaderSource), vertexShaderSource, 0);
glShaderSource(frag, ARRAY_SIZE(fragmentShaderSource), fragmentShaderSource, 0);
glCompileShader(vert);
glCompileShader(frag);
glAttachShader(ProgramID, vert);
glAttachShader(ProgramID, frag);
glLinkProgram(ProgramID);
glDeleteShader(vert);
glDeleteShader(frag);
mvpMatrixLocation = glGetUniformLocation(ProgramID, "mvpMatrix");
textureLocation = glGetUniformLocation(ProgramID, "texture");
scaleLocation = glGetUniformLocation(ProgramID, "scale");
brightnessLocation = glGetUniformLocation(ProgramID, "brightness");
positionAttribLocation = glGetAttribLocation(ProgramID, "position");
offsetAttribLocation = glGetAttribLocation(ProgramID, "offset");
colourAttribLocation = glGetAttribLocation(ProgramID, "colour");
packedTexCoordsAttribLocation = glGetAttribLocation(ProgramID, "packedTexCoords");
make_mvp_matrix(mvp_matrix, 0.0f-(SHIFTX*ALG_MAX_X), (ALG_MAX_Y-1)/SCALEY-(SHIFTY*ALG_MAX_Y), (ALG_MAX_X-1)/SCALEX-(SHIFTX*ALG_MAX_X), 0.0f-(SHIFTY*ALG_MAX_Y));
}
static void context_reset(void)
{
rglgen_resolve_symbols(hw_render.get_proc_address);
compile_gl_program();
create_gl_image(DotWidth, DotHeight, DotImage, &DotTextureID);
create_gl_image(BloomWidth, BloomHeight, BloomImage, &BloomTextureID);
#if 0
setup_vao();
#endif
#ifdef CORE
context_alive = true;
#endif
}
static void context_destroy(void)
{
#ifdef CORE
glDeleteVertexArrays(1, &vao);
vao = 0;
context_alive = false;
#endif
if (vbo)
{
glDeleteBuffers(1, &vbo);
vbo = 0;
}
if (DotTextureID)
{
glDeleteTextures(1, &DotTextureID);
DotTextureID = 0;
}
if (BloomTextureID)
{
glDeleteTextures(1, &BloomTextureID);
BloomTextureID = 0;
}
if (ProgramID)
{
glDeleteProgram(ProgramID);
ProgramID = 0;
}
}
#ifdef HAVE_OPENGLES
static bool retro_init_hw_context(bool useHardwareContext)
{
if (useHardwareContext)
{
#if defined(HAVE_OPENGLES_3_1)
hw_render.context_type = RETRO_HW_CONTEXT_OPENGLES_VERSION;
hw_render.version_major = 3;
hw_render.version_minor = 1;
#elif defined(HAVE_OPENGLES3)
hw_render.context_type = RETRO_HW_CONTEXT_OPENGLES3;
#else
hw_render.context_type = RETRO_HW_CONTEXT_OPENGLES2;
#endif
hw_render.context_reset = context_reset;
hw_render.context_destroy = context_destroy;
hw_render.depth = false;
hw_render.stencil = false;
hw_render.bottom_left_origin = true;
}
else
hw_render.context_type = RETRO_HW_CONTEXT_NONE;
if (!environ_cb(RETRO_ENVIRONMENT_SET_HW_RENDER, &hw_render))
return false;
return true;
}
#else
static bool retro_init_hw_context(bool useHardwareContext)
{
if (useHardwareContext)
{
#if defined(CORE)
hw_render.context_type = RETRO_HW_CONTEXT_OPENGL_CORE;
hw_render.version_major = 3;
hw_render.version_minor = 1;
#else
hw_render.context_type = RETRO_HW_CONTEXT_OPENGL;
#endif
hw_render.context_reset = context_reset;
hw_render.context_destroy = context_destroy;
hw_render.depth = false;
hw_render.stencil = false;
hw_render.bottom_left_origin = true;
}
else
hw_render.context_type = RETRO_HW_CONTEXT_NONE;
if (!environ_cb(RETRO_ENVIRONMENT_SET_HW_RENDER, &hw_render))
return false;
return true;
}
#endif
#endif
static bool set_rendering_context(bool useHardwareContext)
{
#ifdef HAS_GPU
if (useHardwareContext)
{
enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_XRGB8888;
if (!environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt) || !retro_init_hw_context(true))
{
log_cb(RETRO_LOG_INFO, "XRGB8888 is not supported or couldn't initialise HW context, using software renderer.\n");
enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_0RGB1555;
environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt);
return false;
}
}
else
#endif
{
enum retro_pixel_format fmt = RETRO_PIXEL_FORMAT_0RGB1555;
environ_cb(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt);
#ifdef HAS_GPU
retro_init_hw_context(false);
#endif
}
return true;
}
static float get_float_variable(const char* key, float def)
{
struct retro_variable var;
var.value = NULL;
var.key = key;
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
return atof(var.value);
return def;
}
static void check_variables(void)
{
struct retro_variable var;
struct retro_system_av_info av_info;
#ifdef HAS_GPU
var.value = NULL;
var.key = "vecx_use_hw";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
if (!strcmp(var.value, "Hardware"))
{
if (!usingHWContext)
{
if (set_rendering_context(true))
usingHWContext = true;
}
}
else
{
if (usingHWContext)
{
set_rendering_context(false);
usingHWContext = false;
}
}
}
else
usingHWContext = false;
if (usingHWContext)
{
var.value = NULL;
var.key = "vecx_res_hw";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
char *pch;
char str[100];
snprintf(str, sizeof(str), "%s", var.value);
pch = strtok(str, "x");
if (pch)
WIDTH = strtoul(pch, NULL, 0);
pch = strtok(NULL, "x");
if (pch)
HEIGHT = strtoul(pch, NULL, 0);
usingHWContext = true;
}
else
usingHWContext = false;
}
if (usingHWContext)
{
var.value = NULL;
var.key = "vecx_bloom_brightness";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
int value = atoi(var.value);
if (value < 0)
value = 4;
maxAlpha = value * 0.05f;
}
var.value = NULL;
var.key = "vecx_line_brightness";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
int value = atoi(var.value);
if (value <= 0)
value = 4;
lineBrightness = value * 54.0f;
}
var.value = NULL;
var.key = "vecx_line_width";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
int value = atoi(var.value);
if (value <= 0)
value = 4;
lineWidth = value * 18.75f;
}
var.value = NULL;
var.key = "vecx_bloom_width";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
int value = atoi(var.value);
if (value <= 0)
value = 8;
bloomWidthMultiplier = value;
}
}
else
#endif
{
var.value = NULL;
var.key = "vecx_res_multi";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
if (!strcmp(var.value, "1"))
{
WIDTH = 330;
HEIGHT = 410;
point_size = 1;
}
else if (!strcmp(var.value, "2"))
{
WIDTH = 660;
HEIGHT = 820;
point_size = 2;
}
else if (!strcmp(var.value, "3"))
{
WIDTH = 990;
HEIGHT = 1230;
point_size = 2;
}
else if (!strcmp(var.value, "4"))
{
WIDTH = 1320;
HEIGHT = 1640;
point_size = 3;
}
}
}
SCALEX = get_float_variable("vecx_scale_x", 1);
SCALEY = get_float_variable("vecx_scale_y", 1);
SHIFTX = 0.5*(1-SCALEX)+get_float_variable("vecx_shift_x", 0)/2.;
SHIFTY = 0.5*(1-SCALEY)+get_float_variable("vecx_shift_y", 0)/2.;
retro_get_system_av_info(&av_info);
environ_cb(RETRO_ENVIRONMENT_SET_GEOMETRY, &av_info);
}
static void fallback_log(enum retro_log_level level, const char *fmt, ...)
{
}
void retro_init(void)
{
unsigned level = 5;
struct retro_log_callback log;
if (environ_cb(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log))
log_cb = log.log;
else
log_cb = fallback_log;
environ_cb(RETRO_ENVIRONMENT_SET_PERFORMANCE_LEVEL, &level);
check_variables();
}
size_t retro_serialize_size(void)
{
return vecx_statesz();
}
bool retro_serialize(void *data, size_t size)
{
return vecx_serialize((char*)data, size);
}
bool retro_unserialize(const void *data, size_t size)
{
return vecx_deserialize((char*)data, size);
}
static unsigned char cart[65536];
bool retro_load_game(const struct retro_game_info *info)
{
size_t cart_sz;
struct retro_input_descriptor desc[] = {
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "Left" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "Up" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "Down" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "Right" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "2" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "1" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X, "3" },
{ 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_Y, "4" },
{ 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "Left" },
{ 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "Up" },
{ 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "Down" },
{ 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "Right" },
{ 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "2" },
{ 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "1" },
{ 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_X, "3" },
{ 1, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_Y, "4" },
{ 0 }
};
if (!info)
return false;
#ifdef HAS_GPU
if (usingHWContext)
usingHWContext = set_rendering_context(true);
else
usingHWContext = !set_rendering_context(false);
/* Hide options that don't apply to current renderer. */
if (usingHWContext)
{
struct retro_core_option_display option_display;
option_display.visible = false;
option_display.key = "vecx_res_multi";
environ_cb(RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY, &option_display);
}
else
{
struct retro_core_option_display option_display;
option_display.visible = false;
option_display.key = "vecx_res_hw";
environ_cb(RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY, &option_display);
option_display.key = "vecx_line_brightness";
environ_cb(RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY, &option_display);
option_display.key = "vecx_line_width";
environ_cb(RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY, &option_display);
option_display.key = "vecx_bloom_brightness";
environ_cb(RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY, &option_display);
option_display.key = "vecx_bloom_width";
environ_cb(RETRO_ENVIRONMENT_SET_CORE_OPTIONS_DISPLAY, &option_display);
}
#else
set_rendering_context(false);
#endif
environ_cb(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, desc);
e8910_init_sound();
memset(framebuffer, 0, sizeof(framebuffer));
/* start with a fresh BIOS copy */
memcpy(rom, bios_data, bios_data_size);
/* just memcpy buffer, ROMs are so tiny on Vectrex */
cart_sz = sizeof(cart) / sizeof(cart[0]);
if (info->data && info->size > 0 && info->size <= cart_sz)
{
int b;
memset(cart, 0, cart_sz);
memcpy(cart, info->data, info->size);
for(b = 0; b < sizeof(cart); b++)
set_cart(b, cart[b]);
vecx_reset();
e8910_init_sound();
return true;
}
return false;
}
void retro_unload_game(void)
{
int b;
memset(cart, 0, sizeof(cart) / sizeof(cart[0]));
for(b = 0; b < sizeof(cart); b++)
set_cart(b, 0);
vecx_reset();
}
void retro_reset(void)
{
vecx_reset();
e8910_init_sound();
}
static INLINE uint16_t RGB1555(int col)
{
col >>= 2; /* Lose the bottom two bits because we are squeezing 7 bits of colour into 5. */
return col << 10 | col << 5 | col;
}
static INLINE void draw_point(int x, int y, uint16_t col)
{
if (point_size == 1)
{
if (0 <= x && x < WIDTH && 0 <= y && y < HEIGHT)
framebuffer[ (y * WIDTH) + x ] = col;
}
else if (point_size == 2)
{
/* point shape:
* .X.
* XXX
* .X.
*/
int pos = y * WIDTH + x;
if (0 <= x && x < WIDTH && 0 <= y && y < HEIGHT)
framebuffer[ pos ] = col;
if ( x > 0 )
framebuffer[ pos - 1 ] = col;
if ( x < WIDTH -1 )
framebuffer[ pos + 1 ] = col;
if ( y > 0)
framebuffer[ pos - WIDTH ] = col;
if ( y < HEIGHT - 1 )
framebuffer[ pos + WIDTH ] = col;
}
else
{
int dy, posy;
/* point shape:
* .XX.
* XXXX
* XXXX
* .XX.
*/
x--;
y--;
posy = y * WIDTH;
for (dy = 0 ; dy < 4 ; dy++, posy += WIDTH)
{
int y1 = y + dy;
if (0 <= y1 && y1 < HEIGHT)
{
int dx;
for (dx = 0 ; dx < 4 ; dx++)
{
int x1 = x + dx;
if (0 <= x1 && x1 < WIDTH && ( dx % 3 != 0 || dy % 3 != 0))
framebuffer[ posy + x1 ] = col;
}
}
}
}
}
static INLINE void draw_line(
unsigned x0, unsigned y0,
unsigned x1, unsigned y1, uint16_t col)
{
int dx = abs((int)x1-(int)x0), sx = x0<x1 ? 1 : -1;
int dy = abs((int)y1-(int)y0), sy = y0<y1 ? 1 : -1;
int err = (dx>dy ? dx : -dy) / 2, e2;
while(1)
{
draw_point(x0, y0, col);
if (x0==x1 && y0==y1)
break;
e2 = err;
if (e2 >-dx)
{
err -= dy;
x0 += sx;
}
if (e2 < dy)
{
err += dx;
y0 += sy;
}
}
}
#ifdef HAS_GPU
static inline uint32_t make_all(float dx, float dy, int8_t col, uint8_t tc)
{
return (((int8_t)(dx*64.0f+0.5f)) & 0xff) | (((int8_t)(dy*64.0f+0.5f) & 0xff) << 8) | ((col << 16)&0xff0000) | (tc << 24);
}
static inline float dot2d(VECX_POINT a, VECX_POINT b)
{
return a.x * b.x + a.y * b.y;
}
static void intersection_point(VECX_POINT *res,
VECX_POINT a, VECX_POINT b, VECX_POINT c, VECX_POINT d)
{
float a1 = b.y - a.y;
float b1 = a.x - b.x;
float c1 = a1 * a.x + b1 * a.y;
float a2 = d.y - c.y;
float b2 = c.x - d.x;
float c2 = a2 * c.x + b2 * c.y;
float determinant = a1 * b2 - a2 * b1;
if (determinant == 0.0f)
{
res->x = 0.0f;
res->y = 0.0f;
}
else
{
res->x = (b2 * c1 - b1 * c2) / determinant;
res->y = (a1 * c2 - a2 * c1) / determinant;
}
}
#endif
void osint_render(void)
{
#ifdef HAS_GPU
if (!usingHWContext)
#endif
{
int i;
memset(framebuffer, 0, BUFSZ * sizeof(unsigned short));
/* rasterize list of vectors */
for (i = 0; i < vector_draw_cnt; i++)
{
unsigned x0, x1, y0, y1;
unsigned char intensity = vectors_draw[i].color;
if (intensity == 128)
continue;
x0 = ((float)vectors_draw[i].x0 / (float)ALG_MAX_X * SCALEX + SHIFTX) * (float)WIDTH;
x1 = ((float)vectors_draw[i].x1 / (float)ALG_MAX_X * SCALEX + SHIFTX) * (float)WIDTH;
y0 = ((float)vectors_draw[i].y0 / (float)ALG_MAX_Y * SCALEY + SHIFTY) * (float)HEIGHT;
y1 = ((float)vectors_draw[i].y1 / (float)ALG_MAX_Y * SCALEY + SHIFTY) * (float)HEIGHT;
if (x0 - x1 == 0 && y0 - y1 == 0)
draw_point(x0, y0, RGB1555(intensity));
else
draw_line(x0, y0, x1, y1, RGB1555(intensity));
}
}
#ifdef HAS_GPU
else
{
int i;
GLint num_verts = 0;
int continuing = 0;
int colour = 0;
float dx = 0.0f;
float dy = 0.0f;
GLint scissorTestEnabled = glIsEnabled(GL_SCISSOR_TEST);
GLint scissorBox[4];
glGetIntegerv(GL_SCISSOR_BOX, scissorBox);
glBindFramebuffer(RARCH_GL_FRAMEBUFFER, hw_render.get_current_framebuffer());
/* The texture backing the framebuffer is square and
* a power-of-two, we only draw in the bottom left of it.
*
* We use the scissor box so the glClearColor() only
* updates the part of the texture that we use rather than
* all the texture.
*
* This saves memory bandwidth, which is very important on
* low memory bandwidth and/or tile based GPUs.
*/
glScissor(0, 0, WIDTH, HEIGHT);
glEnable(GL_SCISSOR_TEST);
glViewport(0, 0, WIDTH, HEIGHT);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f-maxAlpha);
glClear(GL_COLOR_BUFFER_BIT);
glEnable(GL_BLEND);
glUseProgram(ProgramID);
glUniformMatrix4fv(mvpMatrixLocation, 1, GL_FALSE, mvp_matrix);
glVertexAttribPointer(positionAttribLocation, 2, GL_UNSIGNED_SHORT, GL_FALSE, sizeof(GLVERTEX), &(vertices[0].pos));
glEnableVertexAttribArray(positionAttribLocation);
glVertexAttribPointer(offsetAttribLocation, 2, GL_BYTE, GL_FALSE, sizeof(GLVERTEX), &(vertices[0].offsets));
glEnableVertexAttribArray(offsetAttribLocation);
glVertexAttribPointer(colourAttribLocation, 1, GL_BYTE, GL_FALSE, sizeof(GLVERTEX), &(vertices[0].colour));
glEnableVertexAttribArray(colourAttribLocation);
glVertexAttribPointer(packedTexCoordsAttribLocation, 1, GL_UNSIGNED_BYTE, GL_FALSE, sizeof(GLVERTEX), &(vertices[0].packedTexCoords));
glEnableVertexAttribArray(packedTexCoordsAttribLocation);
for (i = 0; i < vector_draw_cnt; i++)
{
colour = vectors_draw[i].color;
if (colour == 0 || colour > 127)
continue;
/* Is this vector a point? */
if (vectors_draw[i].x0 == vectors_draw[i].x1 && vectors_draw[i].y0 == vectors_draw[i].y1
/* That isn't joining two lines. */
&& (vectors_draw[i].x0 != vectors_draw[i-1].x1 || vectors_draw[i].x1 != vectors_draw[i+1].x0 ||
vectors_draw[i].y0 != vectors_draw[i-1].y1 || vectors_draw[i].y1 != vectors_draw[i+1].y0))
#if 0
if (vectors_draw[i].p0 == vectors_draw[i].p1
&& (vectors_draw[i].p0 != vectors_draw[i-1].p1 || vectors_draw[i].p1 != vectors_draw[i+1].p0))
#endif
{
vertices[num_verts].pos = vectors_draw[i].x0 | vectors_draw[i].y0 << 16;
vertices[num_verts].rest = make_all(-dotScale, dotScale, colour, 0x02);
num_verts++;
vertices[num_verts].pos = vectors_draw[i].x0 | vectors_draw[i].y0 << 16;
vertices[num_verts].rest = make_all(dotScale, dotScale, colour, 0x22);
num_verts++;
vertices[num_verts].pos = vectors_draw[i].x0 | vectors_draw[i].y0 << 16;
vertices[num_verts].rest = make_all(-dotScale, -dotScale, colour, 0x00);
num_verts++;
vertices[num_verts] = vertices[num_verts-2];
num_verts++;
vertices[num_verts] = vertices[num_verts-2];
num_verts++;
vertices[num_verts].pos = vectors_draw[i].x0 | vectors_draw[i].y0 << 16;
vertices[num_verts].rest = make_all(dotScale, -dotScale, colour, 0x20);
num_verts++;
continuing = 0;
continue; /* Loop round to the next vector. */
}
/* Draw end cap if we are not continuing the line */
if (!continuing)
{
dx = vectors_draw[i].x1 - vectors_draw[i].x0;
dy = vectors_draw[i].y1 - vectors_draw[i].y0;
float length = sqrt(dx*dx+dy*dy);
dx /= length;
dy /= length;
vertices[num_verts].pos = vectors_draw[i].x0 | vectors_draw[i].y0 << 16;
vertices[num_verts].rest = make_all((-dy-dx), (dx-dy), colour, 0x20);
num_verts++;
vertices[num_verts].pos = vectors_draw[i].x0 | vectors_draw[i].y0 << 16;
vertices[num_verts].rest = make_all((dy-dx), (-dx-dy), colour, 0x22);
num_verts++;
vertices[num_verts].pos = vectors_draw[i].x0 | vectors_draw[i].y0 << 16;
vertices[num_verts].rest = make_all(-dy, dx, colour, 0x10);
num_verts++;
vertices[num_verts] = vertices[num_verts-2];
num_verts++;
vertices[num_verts] = vertices[num_verts-2];
num_verts++;
vertices[num_verts].pos = vectors_draw[i].x0 | vectors_draw[i].y0 << 16;
vertices[num_verts].rest = make_all(dy, -dx, colour, 0x12);
num_verts++;
}
float nextDx = dx;
float nextDy = dy;
/* Are we contiguous with the next vector? */
if (i < vector_draw_cnt-1 && /* We are not the last vector... */
#if 0
(vectors_draw[i].p1 == vectors_draw[i+1].p0) &&
(vectors_draw[i+1].p0 != vectors_draw[i+1].p1))
#endif
(vectors_draw[i].x1 == vectors_draw[i+1].x0 && vectors_draw[i].y1 == vectors_draw[i+1].y0) && /* ...are connected to next vector... */
(vectors_draw[i+1].x0 != vectors_draw[i+1].x1 || vectors_draw[i+1].y0 != vectors_draw[i+1].y1)) /* ...and the next vector isn't a point. */
{
float dot;
VECX_POINT this_vec, next_vec;
float localNextDx = vectors_draw[i+1].x1 - vectors_draw[i+1].x0;
float localNextDy = vectors_draw[i+1].y1 - vectors_draw[i+1].y0;
float length = sqrt(localNextDx*localNextDx+localNextDy*localNextDy);
localNextDx /= length;
localNextDy /= length;