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RetroArch/gfx/gl.c
Themaister 318d875981 Small cleanups.
2012-01-03 02:50:45 +01:00

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/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
* Copyright (C) 2010-2011 - Hans-Kristian Arntzen
*
* Some code herein may be based on code found in BSNES.
*
* SSNES is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* SSNES is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with SSNES.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "../driver.h"
#include <stdint.h>
#include "../libsnes.hpp"
#include <stdio.h>
#include <string.h>
#include "../general.h"
#include <math.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gl_common.h"
#include "gfx_common.h"
#include "sdlwrap.h"
#include "../strl.h"
#define NO_SDL_GLEXT
#include "SDL.h"
#include "SDL_opengl.h"
#include "../input/ssnes_sdl_input.h"
#ifdef HAVE_CG
#include "shader_cg.h"
#endif
#ifdef HAVE_XML
#include "shader_glsl.h"
#endif
#ifdef HAVE_FREETYPE
#include "fonts.h"
#endif
// Used for the last pass when rendering to the back buffer.
static const GLfloat vertexes_flipped[] = {
0, 0,
0, 1,
1, 1,
1, 0
};
// Used when rendering to an FBO.
// Texture coords have to be aligned with vertex coordinates.
static const GLfloat vertexes[] = {
0, 1,
0, 0,
1, 0,
1, 1
};
static const GLfloat tex_coords[] = {
0, 1,
0, 0,
1, 0,
1, 1
};
static const GLfloat white_color[] = {
1, 1, 1, 1,
1, 1, 1, 1,
1, 1, 1, 1,
1, 1, 1, 1,
};
#define LOAD_SYM(sym) if (!p##sym) { SDL_SYM_WRAP(p##sym, #sym) }
#ifdef HAVE_FBO
#ifdef _WIN32
static PFNGLGENFRAMEBUFFERSPROC pglGenFramebuffers = NULL;
static PFNGLBINDFRAMEBUFFERPROC pglBindFramebuffer = NULL;
static PFNGLFRAMEBUFFERTEXTURE2DPROC pglFramebufferTexture2D = NULL;
static PFNGLCHECKFRAMEBUFFERSTATUSPROC pglCheckFramebufferStatus = NULL;
static PFNGLDELETEFRAMEBUFFERSPROC pglDeleteFramebuffers = NULL;
static bool load_fbo_proc(void)
{
LOAD_SYM(glGenFramebuffers);
LOAD_SYM(glBindFramebuffer);
LOAD_SYM(glFramebufferTexture2D);
LOAD_SYM(glCheckFramebufferStatus);
LOAD_SYM(glDeleteFramebuffers);
return pglGenFramebuffers && pglBindFramebuffer && pglFramebufferTexture2D &&
pglCheckFramebufferStatus && pglDeleteFramebuffers;
}
#else
#define pglGenFramebuffers glGenFramebuffers
#define pglBindFramebuffer glBindFramebuffer
#define pglFramebufferTexture2D glFramebufferTexture2D
#define pglCheckFramebufferStatus glCheckFramebufferStatus
#define pglDeleteFramebuffers glDeleteFramebuffers
static bool load_fbo_proc(void) { return true; }
#endif
#endif
#if (defined(HAVE_XML) || defined(HAVE_CG)) && defined(_WIN32)
PFNGLCLIENTACTIVETEXTUREPROC pglClientActiveTexture = NULL;
PFNGLACTIVETEXTUREPROC pglActiveTexture = NULL;
static inline bool load_gl_proc(void)
{
LOAD_SYM(glClientActiveTexture);
LOAD_SYM(glActiveTexture);
return pglClientActiveTexture && pglActiveTexture;
}
#else
static inline bool load_gl_proc(void) { return true; }
#endif
#define MAX_SHADERS 16
#if defined(HAVE_XML) || defined(HAVE_CG)
#define TEXTURES 8
#else
#define TEXTURES 1
#endif
#define TEXTURES_MASK (TEXTURES - 1)
typedef struct gl
{
bool vsync;
GLuint texture[TEXTURES];
unsigned tex_index; // For use with PREV.
struct gl_tex_info prev_info[TEXTURES];
GLuint tex_filter;
void *empty_buf;
unsigned frame_count;
#ifdef HAVE_FBO
// Render-to-texture, multipass shaders
GLuint fbo[MAX_SHADERS];
GLuint fbo_texture[MAX_SHADERS];
struct gl_fbo_rect fbo_rect[MAX_SHADERS];
struct gl_fbo_scale fbo_scale[MAX_SHADERS];
bool render_to_tex;
int fbo_pass;
bool fbo_inited;
#endif
bool should_resize;
bool quitting;
bool fullscreen;
bool keep_aspect;
unsigned full_x, full_y;
unsigned win_width;
unsigned win_height;
unsigned vp_width, vp_out_width;
unsigned vp_height, vp_out_height;
unsigned last_width[TEXTURES];
unsigned last_height[TEXTURES];
unsigned tex_w, tex_h;
GLfloat tex_coords[8];
#ifdef HAVE_FBO
GLfloat fbo_tex_coords[8];
#endif
GLenum texture_type; // XBGR1555 or ARGB
GLenum texture_fmt;
unsigned base_size; // 2 or 4
#ifdef HAVE_FREETYPE
font_renderer_t *font;
GLuint font_tex;
int font_tex_w, font_tex_h;
void *font_tex_empty_buf;
char font_last_msg[256];
int font_last_width, font_last_height;
GLfloat font_color[16];
GLfloat font_color_dark[16];
#endif
} gl_t;
////////////////// Shaders
static bool gl_shader_init(void)
{
switch (g_settings.video.shader_type)
{
case SSNES_SHADER_AUTO:
{
if (strlen(g_settings.video.cg_shader_path) > 0 && strlen(g_settings.video.bsnes_shader_path) > 0)
SSNES_WARN("Both Cg and bSNES XML shader are defined in config file. Cg shader will be selected by default.\n");
#ifdef HAVE_CG
if (strlen(g_settings.video.cg_shader_path) > 0)
return gl_cg_init(g_settings.video.cg_shader_path);
#endif
#ifdef HAVE_XML
if (strlen(g_settings.video.bsnes_shader_path) > 0)
return gl_glsl_init(g_settings.video.bsnes_shader_path);
#endif
break;
}
#ifdef HAVE_CG
case SSNES_SHADER_CG:
{
return gl_cg_init(g_settings.video.cg_shader_path);
break;
}
#endif
#ifdef HAVE_XML
case SSNES_SHADER_BSNES:
{
return gl_glsl_init(g_settings.video.bsnes_shader_path);
break;
}
#endif
default:
break;
}
return true;
}
static void gl_shader_use(unsigned index)
{
#ifdef HAVE_CG
gl_cg_use(index);
#endif
#ifdef HAVE_XML
gl_glsl_use(index);
#endif
}
static void gl_shader_deinit(void)
{
#ifdef HAVE_CG
gl_cg_deinit();
#endif
#ifdef HAVE_XML
gl_glsl_deinit();
#endif
}
static void gl_shader_set_proj_matrix(void)
{
#ifdef HAVE_CG
gl_cg_set_proj_matrix();
#endif
#ifdef HAVE_XML
gl_glsl_set_proj_matrix();
#endif
}
static void gl_shader_set_params(unsigned width, unsigned height,
unsigned tex_width, unsigned tex_height,
unsigned out_width, unsigned out_height,
unsigned frame_count,
const struct gl_tex_info *info,
const struct gl_tex_info *prev_info,
const struct gl_tex_info *fbo_info, unsigned fbo_info_cnt)
{
#ifdef HAVE_CG
gl_cg_set_params(width, height,
tex_width, tex_height,
out_width, out_height,
frame_count, info, prev_info, fbo_info, fbo_info_cnt);
#endif
#ifdef HAVE_XML
gl_glsl_set_params(width, height,
tex_width, tex_height,
out_width, out_height,
frame_count, info, prev_info, fbo_info, fbo_info_cnt);
#endif
}
static unsigned gl_shader_num(void)
{
unsigned num = 0;
#ifdef HAVE_CG
unsigned cg_num = gl_cg_num();
if (cg_num > num)
num = cg_num;
#endif
#ifdef HAVE_XML
unsigned glsl_num = gl_glsl_num();
if (glsl_num > num)
num = glsl_num;
#endif
return num;
}
static bool gl_shader_filter_type(unsigned index, bool *smooth)
{
bool valid = false;
#ifdef HAVE_CG
if (!valid)
valid = gl_cg_filter_type(index, smooth);
#endif
#ifdef HAVE_XML
if (!valid)
valid = gl_glsl_filter_type(index, smooth);
#endif
return valid;
}
#ifdef HAVE_FBO
static void gl_shader_scale(unsigned index, struct gl_fbo_scale *scale)
{
scale->valid = false;
#ifdef HAVE_CG
if (!scale->valid)
gl_cg_shader_scale(index, scale);
#endif
#ifdef HAVE_XML
if (!scale->valid)
gl_glsl_shader_scale(index, scale);
#endif
}
#endif
///////////////////
//////////////// Message rendering
static inline void gl_init_font(gl_t *gl, const char *font_path, unsigned font_size)
{
#ifdef HAVE_FREETYPE
if (!g_settings.video.font_enable)
return;
const char *path = font_path;
if (!*path)
path = font_renderer_get_default_font();
if (path)
{
gl->font = font_renderer_new(path, font_size);
if (gl->font)
{
glGenTextures(1, &gl->font_tex);
glBindTexture(GL_TEXTURE_2D, gl->font_tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glBindTexture(GL_TEXTURE_2D, gl->texture[gl->tex_index]);
}
else
SSNES_WARN("Couldn't init font renderer with font \"%s\"...\n", font_path);
}
else
SSNES_LOG("Did not find default font.\n");
for (unsigned i = 0; i < 4; i++)
{
gl->font_color[4 * i + 0] = g_settings.video.msg_color_r;
gl->font_color[4 * i + 1] = g_settings.video.msg_color_g;
gl->font_color[4 * i + 2] = g_settings.video.msg_color_b;
gl->font_color[4 * i + 3] = 1.0;
}
for (unsigned i = 0; i < 4; i++)
{
for (unsigned j = 0; j < 3; j++)
gl->font_color_dark[4 * i + j] = 0.3 * gl->font_color[4 * i + j];
gl->font_color_dark[4 * i + 3] = 1.0;
}
#else
(void)gl;
(void)font_path;
(void)font_size;
#endif
}
// Horribly long and complex FBO init :D
static void gl_init_fbo(gl_t *gl, unsigned width, unsigned height)
{
#ifdef HAVE_FBO
if (!g_settings.video.render_to_texture && gl_shader_num() == 0)
return;
struct gl_fbo_scale scale, scale_last;
gl_shader_scale(1, &scale);
gl_shader_scale(gl_shader_num(), &scale_last);
// No need to use FBOs.
if (gl_shader_num() == 1 && !scale.valid && !g_settings.video.render_to_texture)
return;
if (!load_fbo_proc())
{
SSNES_ERR("Failed to locate FBO functions. Won't be able to use render-to-texture.\n");
return;
}
gl->fbo_pass = gl_shader_num() - 1;
if (scale_last.valid)
gl->fbo_pass++;
if (gl->fbo_pass <= 0)
gl->fbo_pass = 1;
if (!scale.valid)
{
scale.scale_x = g_settings.video.fbo_scale_x;
scale.scale_y = g_settings.video.fbo_scale_y;
scale.type_x = scale.type_y = SSNES_SCALE_INPUT;
}
switch (scale.type_x)
{
case SSNES_SCALE_INPUT:
gl->fbo_rect[0].width = width * next_pow2(ceil(scale.scale_x));
break;
case SSNES_SCALE_ABSOLUTE:
gl->fbo_rect[0].width = next_pow2(scale.abs_x);
break;
case SSNES_SCALE_VIEWPORT:
gl->fbo_rect[0].width = next_pow2(gl->win_width);
break;
default:
break;
}
switch (scale.type_y)
{
case SSNES_SCALE_INPUT:
gl->fbo_rect[0].height = height * next_pow2(ceil(scale.scale_y));
break;
case SSNES_SCALE_ABSOLUTE:
gl->fbo_rect[0].height = next_pow2(scale.abs_y);
break;
case SSNES_SCALE_VIEWPORT:
gl->fbo_rect[0].height = next_pow2(gl->win_height);
break;
default:
break;
}
unsigned last_width = gl->fbo_rect[0].width, last_height = gl->fbo_rect[0].height;
gl->fbo_scale[0] = scale;
SSNES_LOG("Creating FBO 0 @ %ux%u\n", gl->fbo_rect[0].width, gl->fbo_rect[0].height);
for (int i = 1; i < gl->fbo_pass; i++)
{
gl_shader_scale(i + 1, &gl->fbo_scale[i]);
if (gl->fbo_scale[i].valid)
{
switch (gl->fbo_scale[i].type_x)
{
case SSNES_SCALE_INPUT:
gl->fbo_rect[i].width = last_width * next_pow2(ceil(gl->fbo_scale[i].scale_x));
break;
case SSNES_SCALE_ABSOLUTE:
gl->fbo_rect[i].width = next_pow2(gl->fbo_scale[i].abs_x);
break;
case SSNES_SCALE_VIEWPORT:
gl->fbo_rect[i].width = next_pow2(gl->win_width);
break;
default:
break;
}
switch (gl->fbo_scale[i].type_y)
{
case SSNES_SCALE_INPUT:
gl->fbo_rect[i].height = last_height * next_pow2(ceil(gl->fbo_scale[i].scale_y));
break;
case SSNES_SCALE_ABSOLUTE:
gl->fbo_rect[i].height = next_pow2(gl->fbo_scale[i].abs_y);
break;
case SSNES_SCALE_VIEWPORT:
gl->fbo_rect[i].height = next_pow2(gl->win_height);
break;
default:
break;
}
last_width = gl->fbo_rect[i].width;
last_height = gl->fbo_rect[i].height;
}
else
{
// Use previous values, essentially a 1x scale compared to last shader in chain.
gl->fbo_rect[i] = gl->fbo_rect[i - 1];
gl->fbo_scale[i].scale_x = gl->fbo_scale[i].scale_y = 1.0;
gl->fbo_scale[i].type_x = gl->fbo_scale[i].type_y = SSNES_SCALE_INPUT;
}
SSNES_LOG("Creating FBO %d @ %ux%u\n", i, gl->fbo_rect[i].width, gl->fbo_rect[i].height);
}
glGenTextures(gl->fbo_pass, gl->fbo_texture);
GLuint base_filt = g_settings.video.second_pass_smooth ? GL_LINEAR : GL_NEAREST;
for (int i = 0; i < gl->fbo_pass; i++)
{
glBindTexture(GL_TEXTURE_2D, gl->fbo_texture[i]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
GLuint filter_type = base_filt;
bool smooth;
if (gl_shader_filter_type(i + 2, &smooth))
filter_type = smooth ? GL_LINEAR : GL_NEAREST;
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filter_type);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filter_type);
glTexImage2D(GL_TEXTURE_2D,
0, GL_RGBA, gl->fbo_rect[i].width, gl->fbo_rect[i].height, 0, GL_BGRA,
GL_UNSIGNED_INT_8_8_8_8, NULL);
}
glBindTexture(GL_TEXTURE_2D, 0);
pglGenFramebuffers(gl->fbo_pass, gl->fbo);
for (int i = 0; i < gl->fbo_pass; i++)
{
pglBindFramebuffer(GL_FRAMEBUFFER, gl->fbo[i]);
pglFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, gl->fbo_texture[i], 0);
GLenum status = pglCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE)
goto error;
}
gl->fbo_inited = true;
return;
error:
glDeleteTextures(gl->fbo_pass, gl->fbo_texture);
pglDeleteFramebuffers(gl->fbo_pass, gl->fbo);
SSNES_ERR("Failed to set up frame buffer objects. Multi-pass shading will not work.\n");
#else
(void)gl;
(void)width;
(void)height;
#endif
}
static inline void gl_deinit_font(gl_t *gl)
{
#ifdef HAVE_FREETYPE
if (gl->font)
{
font_renderer_free(gl->font);
glDeleteTextures(1, &gl->font_tex);
if (gl->font_tex_empty_buf)
free(gl->font_tex_empty_buf);
}
#else
(void)gl;
#endif
}
////////////
static inline unsigned get_alignment(unsigned pitch)
{
if (pitch & 1)
return 1;
if (pitch & 2)
return 2;
if (pitch & 4)
return 4;
return 8;
}
static void set_viewport(gl_t *gl, unsigned width, unsigned height, bool force_full)
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (gl->keep_aspect && !force_full)
{
float desired_aspect = g_settings.video.aspect_ratio;
float device_aspect = (float)width / height;
// If the aspect ratios of screen and desired aspect ratio are sufficiently equal (floating point stuff),
// assume they are actually equal.
if (fabs(device_aspect - desired_aspect) < 0.0001)
{
glViewport(0, 0, width, height);
}
else if (device_aspect > desired_aspect)
{
float delta = (desired_aspect / device_aspect - 1.0) / 2.0 + 0.5;
glViewport(width * (0.5 - delta), 0, 2.0 * width * delta, height);
width = 2.0 * width * delta;
}
else
{
float delta = (device_aspect / desired_aspect - 1.0) / 2.0 + 0.5;
glViewport(0, height * (0.5 - delta), width, 2.0 * height * delta);
height = 2.0 * height * delta;
}
}
else
glViewport(0, 0, width, height);
glOrtho(0, 1, 0, 1, -1, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gl_shader_set_proj_matrix();
gl->vp_width = width;
gl->vp_height = height;
// Set last backbuffer viewport.
if (!force_full)
{
gl->vp_out_width = width;
gl->vp_out_height = height;
}
//SSNES_LOG("Setting viewport @ %ux%u\n", width, height);
}
#ifdef HAVE_FREETYPE
// Somewhat overwhelming code just to render some damn fonts.
// We aim to use NPOT textures for compatibility with old and shitty cards.
// Also, we want to avoid reallocating a texture for each glyph (performance dips), so we
// contruct the whole texture using one call, and copy straight to it with
// glTexSubImage.
struct font_rect
{
int x, y;
int width, height;
int pot_width, pot_height;
};
static void calculate_msg_geometry(const struct font_output *head, struct font_rect *rect)
{
int x_min = head->off_x;
int x_max = head->off_x + head->width;
int y_min = head->off_y;
int y_max = head->off_y + head->height;
while ((head = head->next))
{
int left = head->off_x;
int right = head->off_x + head->width;
int bottom = head->off_y;
int top = head->off_y + head->height;
if (left < x_min)
x_min = left;
if (right > x_max)
x_max = right;
if (bottom < y_min)
y_min = bottom;
if (top > y_max)
y_max = top;
}
rect->x = x_min;
rect->y = y_min;
rect->width = x_max - x_min;
rect->height = y_max - y_min;
}
static void adjust_power_of_two(gl_t *gl, struct font_rect *geom)
{
// Some systems really hate NPOT textures.
geom->pot_width = next_pow2(geom->width);
geom->pot_height = next_pow2(geom->height);
if ((geom->pot_width > gl->font_tex_w) || (geom->pot_height > gl->font_tex_h))
{
gl->font_tex_empty_buf = realloc(gl->font_tex_empty_buf, geom->pot_width * geom->pot_height);
memset(gl->font_tex_empty_buf, 0, geom->pot_width * geom->pot_height);
glPixelStorei(GL_UNPACK_ALIGNMENT, 8);
glPixelStorei(GL_UNPACK_ROW_LENGTH, geom->pot_width);
glTexImage2D(GL_TEXTURE_2D, 0, GL_INTENSITY8, geom->pot_width, geom->pot_height,
0, GL_LUMINANCE, GL_UNSIGNED_BYTE, gl->font_tex_empty_buf);
gl->font_tex_w = geom->pot_width;
gl->font_tex_h = geom->pot_height;
}
}
// Old style "blitting", so we can render all the fonts in one go.
// TODO: Is it possible that fonts could overlap if we blit without alpha blending?
static void blit_fonts(gl_t *gl, const struct font_output *head, const struct font_rect *geom)
{
// Clear out earlier fonts.
glPixelStorei(GL_UNPACK_ALIGNMENT, 8);
glPixelStorei(GL_UNPACK_ROW_LENGTH, gl->font_tex_w);
glTexSubImage2D(GL_TEXTURE_2D,
0, 0, 0, gl->font_tex_w, gl->font_tex_h,
GL_LUMINANCE, GL_UNSIGNED_BYTE, gl->font_tex_empty_buf);
while (head)
{
// head has top-left oriented coords.
int x = head->off_x - geom->x;
int y = head->off_y - geom->y;
y = gl->font_tex_h - head->height - y - 1;
glPixelStorei(GL_UNPACK_ALIGNMENT, get_alignment(head->pitch));
glPixelStorei(GL_UNPACK_ROW_LENGTH, head->pitch);
glTexSubImage2D(GL_TEXTURE_2D,
0, x, y, head->width, head->height,
GL_LUMINANCE, GL_UNSIGNED_BYTE, head->output);
head = head->next;
}
}
static void calculate_font_coords(gl_t *gl,
GLfloat font_vertex[8], GLfloat font_vertex_dark[8], GLfloat font_tex_coords[8])
{
GLfloat lx = g_settings.video.msg_pos_x;
GLfloat hx = (GLfloat)gl->font_last_width / gl->vp_width + lx;
GLfloat ly = g_settings.video.msg_pos_y;
GLfloat hy = (GLfloat)gl->font_last_height / gl->vp_height + ly;
font_vertex[0] = lx;
font_vertex[1] = ly;
font_vertex[2] = lx;
font_vertex[3] = hy;
font_vertex[4] = hx;
font_vertex[5] = hy;
font_vertex[6] = hx;
font_vertex[7] = ly;
GLfloat shift_x = 2.0f / gl->vp_width;
GLfloat shift_y = 2.0f / gl->vp_height;
for (unsigned i = 0; i < 4; i++)
{
font_vertex_dark[2 * i + 0] = font_vertex[2 * i + 0] - shift_x;
font_vertex_dark[2 * i + 1] = font_vertex[2 * i + 1] - shift_y;
}
lx = 0.0f;
hx = (GLfloat)gl->font_last_width / gl->font_tex_w;
ly = 1.0f - (GLfloat)gl->font_last_height / gl->font_tex_h;
hy = 1.0f;
font_tex_coords[0] = lx;
font_tex_coords[1] = hy;
font_tex_coords[2] = lx;
font_tex_coords[3] = ly;
font_tex_coords[4] = hx;
font_tex_coords[5] = ly;
font_tex_coords[6] = hx;
font_tex_coords[7] = hy;
}
static void gl_render_msg(gl_t *gl, const char *msg)
{
if (!gl->font)
return;
GLfloat font_vertex[8];
GLfloat font_vertex_dark[8];
GLfloat font_tex_coords[8];
// Deactivate custom shaders. Enable the font texture.
gl_shader_use(0);
set_viewport(gl, gl->win_width, gl->win_height, false);
glBindTexture(GL_TEXTURE_2D, gl->font_tex);
glTexCoordPointer(2, GL_FLOAT, 0, font_tex_coords);
// Need blending.
// Using fixed function pipeline here since we cannot guarantee presence of shaders (would be kinda overkill anyways).
glEnable(GL_BLEND);
struct font_output_list out;
// If we get the same message, there's obviously no need to render fonts again ...
if (strcmp(gl->font_last_msg, msg) != 0)
{
font_renderer_msg(gl->font, msg, &out);
struct font_output *head = out.head;
struct font_rect geom;
calculate_msg_geometry(head, &geom);
adjust_power_of_two(gl, &geom);
blit_fonts(gl, head, &geom);
font_renderer_free_output(&out);
strlcpy(gl->font_last_msg, msg, sizeof(gl->font_last_msg));
gl->font_last_width = geom.width;
gl->font_last_height = geom.height;
}
calculate_font_coords(gl, font_vertex, font_vertex_dark, font_tex_coords);
glVertexPointer(2, GL_FLOAT, 0, font_vertex_dark);
glColorPointer(4, GL_FLOAT, 0, gl->font_color_dark);
glDrawArrays(GL_QUADS, 0, 4);
glVertexPointer(2, GL_FLOAT, 0, font_vertex);
glColorPointer(4, GL_FLOAT, 0, gl->font_color);
glDrawArrays(GL_QUADS, 0, 4);
// Go back to old rendering path.
glTexCoordPointer(2, GL_FLOAT, 0, gl->tex_coords);
glVertexPointer(2, GL_FLOAT, 0, vertexes_flipped);
glColorPointer(4, GL_FLOAT, 0, white_color);
glBindTexture(GL_TEXTURE_2D, gl->texture[gl->tex_index]);
glDisable(GL_BLEND);
}
#else
static void gl_render_msg(gl_t *gl, const char *msg)
{
(void)gl;
(void)msg;
}
#endif
static inline void set_lut_texture_coords(const GLfloat *coords)
{
#if defined(HAVE_XML) || defined(HAVE_CG)
// For texture images.
pglClientActiveTexture(GL_TEXTURE1);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, coords);
pglClientActiveTexture(GL_TEXTURE0);
#else
(void)coords;
#endif
}
static inline void set_texture_coords(GLfloat *coords, GLfloat xamt, GLfloat yamt)
{
coords[1] = yamt;
coords[4] = xamt;
coords[6] = xamt;
coords[7] = yamt;
}
static void check_window(gl_t *gl)
{
bool quit, resize;
sdlwrap_check_window(&quit,
&resize, &gl->win_width, &gl->win_height,
gl->frame_count);
if (quit)
gl->quitting = true;
else if (resize)
gl->should_resize = true;
}
static bool gl_frame(void *data, const void *frame, unsigned width, unsigned height, unsigned pitch, const char *msg)
{
gl_t *gl = (gl_t*)data;
gl_shader_use(1);
gl->frame_count++;
#if defined(HAVE_XML) || defined(HAVE_CG)
glBindTexture(GL_TEXTURE_2D, gl->texture[gl->tex_index]);
#endif
#ifdef HAVE_FBO
// Render to texture in first pass.
if (gl->fbo_inited)
{
unsigned last_width = width;
unsigned last_height = height;
unsigned last_max_width = gl->tex_w;
unsigned last_max_height = gl->tex_h;
// Calculate viewports for FBOs.
for (int i = 0; i < gl->fbo_pass; i++)
{
switch (gl->fbo_scale[i].type_x)
{
case SSNES_SCALE_INPUT:
gl->fbo_rect[i].img_width = last_width * gl->fbo_scale[i].scale_x;
gl->fbo_rect[i].max_img_width = last_max_width * gl->fbo_scale[i].scale_x;
break;
case SSNES_SCALE_ABSOLUTE:
gl->fbo_rect[i].img_width = gl->fbo_rect[i].max_img_width = gl->fbo_scale[i].abs_x;
break;
case SSNES_SCALE_VIEWPORT:
gl->fbo_rect[i].img_width = gl->fbo_rect[i].max_img_width = gl->fbo_scale[i].scale_x * gl->vp_out_width;
break;
default:
break;
}
switch (gl->fbo_scale[i].type_y)
{
case SSNES_SCALE_INPUT:
gl->fbo_rect[i].img_height = last_height * gl->fbo_scale[i].scale_y;
gl->fbo_rect[i].max_img_height = last_max_height * gl->fbo_scale[i].scale_y;
break;
case SSNES_SCALE_ABSOLUTE:
gl->fbo_rect[i].img_height = gl->fbo_rect[i].max_img_height = gl->fbo_scale[i].abs_y;
break;
case SSNES_SCALE_VIEWPORT:
gl->fbo_rect[i].img_height = gl->fbo_rect[i].max_img_height = gl->fbo_scale[i].scale_y * gl->vp_out_height;
break;
default:
break;
}
last_width = gl->fbo_rect[i].img_width;
last_height = gl->fbo_rect[i].img_height;
last_max_width = gl->fbo_rect[i].max_img_width;
last_max_height = gl->fbo_rect[i].max_img_height;
}
glBindTexture(GL_TEXTURE_2D, gl->texture[gl->tex_index]);
pglBindFramebuffer(GL_FRAMEBUFFER, gl->fbo[0]);
gl->render_to_tex = true;
set_viewport(gl, gl->fbo_rect[0].img_width, gl->fbo_rect[0].img_height, true);
}
#endif
if (gl->should_resize)
{
gl->should_resize = false;
sdlwrap_set_resize(gl->win_width, gl->win_height);
#ifdef HAVE_FBO
if (!gl->render_to_tex)
set_viewport(gl, gl->win_width, gl->win_height, false);
else
{
// Check if we have to recreate our FBO textures.
for (int i = 0; i < gl->fbo_pass; i++)
{
// Check proactively since we might suddently get sizes of tex_w width or tex_h height.
if (gl->fbo_rect[i].max_img_width > gl->fbo_rect[i].width ||
gl->fbo_rect[i].max_img_height > gl->fbo_rect[i].height)
{
unsigned img_width = gl->fbo_rect[i].max_img_width;
unsigned img_height = gl->fbo_rect[i].max_img_height;
unsigned max = img_width > img_height ? img_width : img_height;
unsigned pow2_size = next_pow2(max);
gl->fbo_rect[i].width = gl->fbo_rect[i].height = pow2_size;
pglBindFramebuffer(GL_FRAMEBUFFER, gl->fbo[i]);
glBindTexture(GL_TEXTURE_2D, gl->fbo_texture[i]);
glTexImage2D(GL_TEXTURE_2D,
0, GL_RGBA, gl->fbo_rect[i].width, gl->fbo_rect[i].height, 0, GL_BGRA,
GL_UNSIGNED_INT_8_8_8_8, NULL);
pglFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, gl->fbo_texture[i], 0);
GLenum status = pglCheckFramebufferStatus(GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE)
SSNES_WARN("Failed to reinit FBO texture!\n");
SSNES_LOG("Recreating FBO texture #%d: %ux%u\n", i, gl->fbo_rect[i].width, gl->fbo_rect[i].height);
}
}
// Go back to what we're supposed to do, render to FBO #0 :D
glBindTexture(GL_TEXTURE_2D, gl->texture[gl->tex_index]);
pglBindFramebuffer(GL_FRAMEBUFFER, gl->fbo[0]);
set_viewport(gl, gl->fbo_rect[0].img_width, gl->fbo_rect[0].img_height, true);
}
#else
set_viewport(gl, gl->win_width, gl->win_height, false);
#endif
}
if ((width != gl->last_width[gl->tex_index] || height != gl->last_height[gl->tex_index]) && gl->empty_buf) // Res change. need to clear out texture.
{
gl->last_width[gl->tex_index] = width;
gl->last_height[gl->tex_index] = height;
glPixelStorei(GL_UNPACK_ALIGNMENT, get_alignment(pitch));
glPixelStorei(GL_UNPACK_ROW_LENGTH, gl->tex_w);
glTexSubImage2D(GL_TEXTURE_2D,
0, 0, 0, gl->tex_w, gl->tex_h, gl->texture_type,
gl->texture_fmt, gl->empty_buf);
GLfloat xamt = (GLfloat)width / gl->tex_w;
GLfloat yamt = (GLfloat)height / gl->tex_h;
set_texture_coords(gl->tex_coords, xamt, yamt);
}
#if defined(HAVE_XML) || defined(HAVE_CG)
// We might have used different texture coordinates last frame. Edge case if resolution changes very rapidly.
else if (width != gl->last_width[(gl->tex_index - 1) & TEXTURES_MASK] || height != gl->last_height[(gl->tex_index - 1) & TEXTURES_MASK])
{
GLfloat xamt = (GLfloat)width / gl->tex_w;
GLfloat yamt = (GLfloat)height / gl->tex_h;
set_texture_coords(gl->tex_coords, xamt, yamt);
}
#endif
#ifdef HAVE_FBO
// Need to preserve the "flipped" state when in FBO as well to have
// consistent texture coordinates.
if (gl->render_to_tex)
glVertexPointer(2, GL_FLOAT, 0, vertexes);
#endif
glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch / gl->base_size);
glTexSubImage2D(GL_TEXTURE_2D,
0, 0, 0, width, height, gl->texture_type,
gl->texture_fmt, frame);
struct gl_tex_info tex_info = {0};
tex_info.tex = gl->texture[gl->tex_index];
tex_info.input_size[0] = width;
tex_info.input_size[1] = height;
tex_info.tex_size[0] = gl->tex_w;
tex_info.tex_size[1] = gl->tex_h;
struct gl_tex_info fbo_tex_info[MAX_SHADERS];
unsigned fbo_tex_info_cnt = 0;
memcpy(tex_info.coord, gl->tex_coords, sizeof(gl->tex_coords));
glClear(GL_COLOR_BUFFER_BIT);
gl_shader_set_params(width, height, gl->tex_w, gl->tex_h, gl->vp_width, gl->vp_height, gl->frame_count,
&tex_info, gl->prev_info, fbo_tex_info, fbo_tex_info_cnt);
glDrawArrays(GL_QUADS, 0, 4);
#ifdef HAVE_FBO
if (gl->fbo_inited)
{
// Render the rest of our passes.
glTexCoordPointer(2, GL_FLOAT, 0, gl->fbo_tex_coords);
// It's kinda handy ... :)
const struct gl_fbo_rect *prev_rect;
const struct gl_fbo_rect *rect;
struct gl_tex_info *fbo_info;
// Calculate viewports, texture coordinates etc, and render all passes from FBOs, to another FBO.
for (int i = 1; i < gl->fbo_pass; i++)
{
prev_rect = &gl->fbo_rect[i - 1];
rect = &gl->fbo_rect[i];
fbo_info = &fbo_tex_info[i - 1];
GLfloat xamt = (GLfloat)prev_rect->img_width / prev_rect->width;
GLfloat yamt = (GLfloat)prev_rect->img_height / prev_rect->height;
set_texture_coords(gl->fbo_tex_coords, xamt, yamt);
fbo_info->tex = gl->fbo_texture[i - 1];
fbo_info->input_size[0] = prev_rect->img_width;
fbo_info->input_size[1] = prev_rect->img_height;
fbo_info->tex_size[0] = prev_rect->width;
fbo_info->tex_size[1] = prev_rect->height;
memcpy(fbo_info->coord, gl->fbo_tex_coords, sizeof(gl->fbo_tex_coords));
pglBindFramebuffer(GL_FRAMEBUFFER, gl->fbo[i]);
gl_shader_use(i + 1);
glBindTexture(GL_TEXTURE_2D, gl->fbo_texture[i - 1]);
glClear(GL_COLOR_BUFFER_BIT);
// Render to FBO with certain size.
set_viewport(gl, rect->img_width, rect->img_height, true);
gl_shader_set_params(prev_rect->img_width, prev_rect->img_height,
prev_rect->width, prev_rect->height,
gl->vp_width, gl->vp_height, gl->frame_count,
&tex_info, gl->prev_info, fbo_tex_info, fbo_tex_info_cnt);
glDrawArrays(GL_QUADS, 0, 4);
fbo_tex_info_cnt++;
}
// Render our last FBO texture directly to screen.
prev_rect = &gl->fbo_rect[gl->fbo_pass - 1];
GLfloat xamt = (GLfloat)prev_rect->img_width / prev_rect->width;
GLfloat yamt = (GLfloat)prev_rect->img_height / prev_rect->height;
set_texture_coords(gl->fbo_tex_coords, xamt, yamt);
// Render our FBO texture to back buffer.
pglBindFramebuffer(GL_FRAMEBUFFER, 0);
gl_shader_use(gl->fbo_pass + 1);
glBindTexture(GL_TEXTURE_2D, gl->fbo_texture[gl->fbo_pass - 1]);
glClear(GL_COLOR_BUFFER_BIT);
gl->render_to_tex = false;
set_viewport(gl, gl->win_width, gl->win_height, false);
gl_shader_set_params(prev_rect->img_width, prev_rect->img_height,
prev_rect->width, prev_rect->height,
gl->vp_width, gl->vp_height, gl->frame_count,
&tex_info, gl->prev_info, fbo_tex_info, fbo_tex_info_cnt);
glVertexPointer(2, GL_FLOAT, 0, vertexes_flipped);
glDrawArrays(GL_QUADS, 0, 4);
glTexCoordPointer(2, GL_FLOAT, 0, gl->tex_coords);
}
#endif
#if defined(HAVE_XML) || defined(HAVE_CG)
memmove(gl->prev_info + 1, gl->prev_info, sizeof(tex_info) * (TEXTURES - 1));
memcpy(&gl->prev_info[0], &tex_info, sizeof(tex_info));
gl->tex_index = (gl->tex_index + 1) & TEXTURES_MASK;
#endif
if (msg)
gl_render_msg(gl, msg);
char buf[128];
if (gfx_window_title(buf, sizeof(buf)))
sdlwrap_wm_set_caption(buf);
sdlwrap_swap_buffers();
return true;
}
static void gl_free(void *data)
{
gl_t *gl = (gl_t*)data;
gl_deinit_font(gl);
gl_shader_deinit();
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDisableClientState(GL_COLOR_ARRAY);
glDeleteTextures(TEXTURES, gl->texture);
#ifdef HAVE_FBO
if (gl->fbo_inited)
{
glDeleteTextures(gl->fbo_pass, gl->fbo_texture);
pglDeleteFramebuffers(gl->fbo_pass, gl->fbo);
}
#endif
sdlwrap_destroy();
if (gl->empty_buf)
free(gl->empty_buf);
free(gl);
}
static void gl_set_nonblock_state(void *data, bool state)
{
gl_t *gl = (gl_t*)data;
if (gl->vsync)
{
SSNES_LOG("GL VSync => %s\n", state ? "off" : "on");
sdlwrap_set_swap_interval(state ? 0 : 1, true);
}
}
static void *gl_init(const video_info_t *video, const input_driver_t **input, void **input_data)
{
#ifdef _WIN32
gfx_set_dwm();
#endif
if (!sdlwrap_init())
return NULL;
const SDL_VideoInfo *video_info = SDL_GetVideoInfo();
ssnes_assert(video_info);
unsigned full_x = video_info->current_w;
unsigned full_y = video_info->current_h;
SSNES_LOG("Detecting desktop resolution %ux%u.\n", full_x, full_y);
sdlwrap_set_swap_interval(video->vsync ? 1 : 0, false);
unsigned win_width = video->width;
unsigned win_height = video->height;
if (video->fullscreen && (win_width == 0) && (win_height == 0))
{
win_width = full_x;
win_height = full_y;
}
if (!sdlwrap_set_video_mode(win_width, win_height,
g_settings.video.force_16bit ? 15 : 0, video->fullscreen))
return NULL;
gfx_window_title_reset();
char buf[128];
if (gfx_window_title(buf, sizeof(buf)))
sdlwrap_wm_set_caption(buf);
// Remove that ugly mouse :D
SDL_ShowCursor(SDL_DISABLE);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
#if (defined(HAVE_XML) || defined(HAVE_CG)) && defined(_WIN32)
// Win32 GL lib doesn't have some functions needed for XML shaders.
// Need to load dynamically :(
if (!load_gl_proc())
{
sdlwrap_destroy();
return NULL;
}
#endif
gl_t *gl = (gl_t*)calloc(1, sizeof(gl_t));
if (!gl)
{
sdlwrap_destroy();
return NULL;
}
gl->vsync = video->vsync;
gl->fullscreen = video->fullscreen;
gl->full_x = full_x;
gl->full_y = full_y;
gl->win_width = win_width;
gl->win_height = win_height;
SSNES_LOG("GL: Using resolution %ux%u\n", gl->win_width, gl->win_height);
if (!gl_shader_init())
{
SSNES_ERR("Shader init failed.\n");
sdlwrap_destroy();
free(gl);
return NULL;
}
SSNES_LOG("GL: Loaded %u program(s).\n", gl_shader_num());
// Set up render to texture.
gl_init_fbo(gl, SSNES_SCALE_BASE * video->input_scale,
SSNES_SCALE_BASE * video->input_scale);
gl->keep_aspect = video->force_aspect;
// Apparently need to set viewport for passes when we aren't using FBOs.
gl_shader_use(0);
set_viewport(gl, gl->win_width, gl->win_height, false);
gl_shader_use(1);
set_viewport(gl, gl->win_width, gl->win_height, false);
bool force_smooth;
if (gl_shader_filter_type(1, &force_smooth))
gl->tex_filter = force_smooth ? GL_LINEAR : GL_NEAREST;
else
gl->tex_filter = video->smooth ? GL_LINEAR : GL_NEAREST;
gl->texture_type = GL_BGRA;
gl->texture_fmt = video->rgb32 ? GL_UNSIGNED_INT_8_8_8_8_REV : GL_UNSIGNED_SHORT_1_5_5_5_REV;
gl->base_size = video->rgb32 ? sizeof(uint32_t) : sizeof(uint16_t);
glEnable(GL_TEXTURE_2D);
glDisable(GL_DEPTH_TEST);
glDisable(GL_DITHER);
glClearColor(0, 0, 0, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glGenTextures(TEXTURES, gl->texture);
for (unsigned i = 0; i < TEXTURES; i++)
{
glBindTexture(GL_TEXTURE_2D, gl->texture[i]);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, gl->tex_filter);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, gl->tex_filter);
}
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(2, GL_FLOAT, 0, vertexes_flipped);
memcpy(gl->tex_coords, tex_coords, sizeof(tex_coords));
glTexCoordPointer(2, GL_FLOAT, 0, gl->tex_coords);
glColorPointer(4, GL_FLOAT, 0, white_color);
set_lut_texture_coords(tex_coords);
gl->tex_w = SSNES_SCALE_BASE * video->input_scale;
gl->tex_h = SSNES_SCALE_BASE * video->input_scale;
// Empty buffer that we use to clear out the texture with on res change.
gl->empty_buf = calloc(gl->tex_w * gl->tex_h, gl->base_size);
for (unsigned i = 0; i < TEXTURES; i++)
{
glBindTexture(GL_TEXTURE_2D, gl->texture[i]);
glPixelStorei(GL_UNPACK_ROW_LENGTH, gl->tex_w);
glTexImage2D(GL_TEXTURE_2D,
0, GL_RGBA, gl->tex_w, gl->tex_h, 0, gl->texture_type,
gl->texture_fmt, gl->empty_buf ? gl->empty_buf : NULL);
}
glBindTexture(GL_TEXTURE_2D, gl->texture[gl->tex_index]);
for (unsigned i = 0; i < TEXTURES; i++)
{
gl->last_width[i] = gl->tex_w;
gl->last_height[i] = gl->tex_h;
}
for (unsigned i = 0; i < TEXTURES; i++)
{
gl->prev_info[i].tex = gl->texture[(gl->tex_index - (i + 1)) & TEXTURES_MASK];
gl->prev_info[i].input_size[0] = gl->tex_w;
gl->prev_info[i].tex_size[0] = gl->tex_w;
gl->prev_info[i].input_size[1] = gl->tex_h;
gl->prev_info[i].tex_size[1] = gl->tex_h;
memcpy(gl->prev_info[i].coord, tex_coords, sizeof(tex_coords));
}
// Hook up SDL input driver to get SDL_QUIT events and RESIZE.
sdl_input_t *sdl_input = (sdl_input_t*)input_sdl.init();
if (sdl_input)
{
*input = &input_sdl;
*input_data = sdl_input;
}
else
*input = NULL;
gl_init_font(gl, g_settings.video.font_path, g_settings.video.font_size);
if (!gl_check_error())
{
sdlwrap_destroy();
free(gl);
return NULL;
}
return gl;
}
static bool gl_alive(void *data)
{
gl_t *gl = (gl_t*)data;
check_window(gl);
return !gl->quitting;
}
static bool gl_focus(void *data)
{
(void)data;
return sdlwrap_window_has_focus();
}
#ifdef HAVE_XML
static bool gl_xml_shader(void *data, const char *path)
{
gl_t *gl = (gl_t*)data;
#ifdef HAVE_FBO
if (gl->fbo_inited)
{
pglDeleteFramebuffers(gl->fbo_pass, gl->fbo);
glDeleteTextures(gl->fbo_pass, gl->fbo_texture);
memset(gl->fbo_texture, 0, sizeof(gl->fbo_texture));
memset(gl->fbo, 0, sizeof(gl->fbo));
gl->fbo_inited = false;
gl->render_to_tex = false;
gl->fbo_pass = 0;
glBindTexture(GL_TEXTURE_2D, gl->texture[gl->tex_index]);
}
#endif
gl_shader_deinit();
if (!gl_glsl_init(path))
return false;
// Set up render to texture.
gl_init_fbo(gl, gl->tex_w, gl->tex_h);
// Apparently need to set viewport for passes when we aren't using FBOs.
gl_shader_use(0);
set_viewport(gl, gl->win_width, gl->win_height, false);
gl_shader_use(1);
set_viewport(gl, gl->win_width, gl->win_height, false);
return true;
}
#endif
const video_driver_t video_gl = {
gl_init,
gl_frame,
gl_set_nonblock_state,
gl_alive,
gl_focus,
#ifdef HAVE_XML
gl_xml_shader,
#else
NULL,
#endif
gl_free,
"gl"
};
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