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FBOs. Hacky atm, need more flexibility.

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This commit is contained in:
Themaister 2011-03-06 16:52:49 +01:00
parent 8c6519a53b
commit 52c8d96dca
1 changed files with 73 additions and 8 deletions
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81
gfx/gl.c
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@ -30,7 +30,6 @@
#include "config.h"
#endif
#ifdef __APPLE__
#include <OpenGL/gl.h>
#include <OpenGL/glext.h>
@ -73,12 +72,26 @@ static const GLfloat tex_coords[] = {
1, 1
};
static const GLfloat fbo_tex_coords[] = {
0, 0,
0, 1,
1, 1,
1, 0
};
typedef struct gl
{
bool vsync;
GLuint texture;
GLuint tex_filter;
// Render-to-texture
GLuint fbo;
GLuint fbo_texture;
bool render_to_tex;
unsigned fbo_width;
unsigned fbo_height;
bool should_resize;
bool quitting;
bool keep_aspect;
@ -227,6 +240,34 @@ static inline void gl_init_font(gl_t *gl, const char *font_path, unsigned font_s
#endif
}
static bool gl_init_fbo(gl_t *gl, unsigned fbo_width, unsigned fbo_height)
{
gl->fbo_width = fbo_width;
gl->fbo_height = fbo_height;
glGenTextures(1, &gl->fbo_texture);
glBindTexture(GL_TEXTURE_2D, gl->fbo_texture);
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_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
void *tmp = calloc(gl->fbo_width * gl->fbo_height, sizeof(uint32_t));
glTexImage2D(GL_TEXTURE_2D,
0, GL_RGBA, gl->fbo_width, gl->fbo_height, 0, GL_RGBA,
GL_UNSIGNED_INT_8_8_8_8, tmp);
free(tmp);
glBindTexture(GL_TEXTURE_2D, 0);
glGenFramebuffers(1, &gl->fbo);
glBindFramebuffer(GL_FRAMEBUFFER, gl->fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, gl->fbo_texture, 0);
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
assert(status == GL_FRAMEBUFFER_COMPLETE);
return true;
}
static inline void gl_deinit_font(gl_t *gl)
{
#ifdef HAVE_FREETYPE
@ -314,9 +355,10 @@ static void set_viewport(gl_t *gl)
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
GLuint out_width = gl->win_width, out_height = gl->win_height;
GLuint out_width = gl->render_to_tex ? gl->fbo_width : gl->win_width;
GLuint out_height = gl->render_to_tex ? gl->fbo_height : gl->win_height;
if (gl->keep_aspect)
if (gl->keep_aspect && !gl->render_to_tex)
{
float desired_aspect = g_settings.video.aspect_ratio;
float device_aspect = (float)gl->win_width / gl->win_height;
@ -340,7 +382,7 @@ static void set_viewport(gl_t *gl)
glViewport(0, 0, gl->win_width, gl->win_height);
}
else
glViewport(0, 0, gl->win_width, gl->win_height);
glViewport(0, 0, out_width, out_height);
glOrtho(0, 1, 0, 1, -1, 1);
glMatrixMode(GL_MODELVIEW);
@ -387,16 +429,21 @@ static bool gl_frame(void *data, const uint16_t* frame, unsigned width, unsigned
{
gl_t *gl = data;
// Render to texture in first pass.
glBindTexture(GL_TEXTURE_2D, gl->texture);
glBindFramebuffer(GL_FRAMEBUFFER, gl->fbo);
gl->render_to_tex = true;
if (gl->should_resize)
{
gl->should_resize = false;
SDL_SetVideoMode(gl->win_width, gl->win_height, 0, SDL_OPENGL | SDL_RESIZABLE | (g_settings.video.fullscreen ? SDL_FULLSCREEN : 0));
set_viewport(gl);
}
set_viewport(gl);
glClear(GL_COLOR_BUFFER_BIT);
gl_shader_set_params(width, height, gl->tex_w, gl->tex_h, gl->vp_width, gl->vp_height);
gl_shader_set_params(width, height, gl->tex_w, gl->tex_h, gl->fbo_width, gl->fbo_height);
if (width != gl->last_width || height != gl->last_height) // res change. need to clear out texture.
{
@ -429,6 +476,18 @@ static bool gl_frame(void *data, const uint16_t* frame, unsigned width, unsigned
glFlush();
glDrawArrays(GL_QUADS, 0, 4);
// Render our FBO texture to back buffer.
glBindFramebuffer(GL_FRAMEBUFFER, 0);
glClear(GL_COLOR_BUFFER_BIT);
gl->render_to_tex = false;
gl_shader_set_params(gl->fbo_width, gl->fbo_height, gl->fbo_width, gl->fbo_height, gl->vp_width, gl->vp_height);
set_viewport(gl);
glBindTexture(GL_TEXTURE_2D, gl->fbo_texture);
glTexCoordPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), fbo_tex_coords);
glDrawArrays(GL_QUADS, 0, 4);
glTexCoordPointer(2, GL_FLOAT, 2 * sizeof(GLfloat), gl->tex_coords);
if (msg)
gl_render_msg(gl, msg);
@ -447,6 +506,8 @@ static void gl_free(void *data)
glDisableClientState(GL_VERTEX_ARRAY);
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glDeleteTextures(1, &gl->texture);
glDeleteTextures(1, &gl->fbo_texture);
glDeleteFramebuffers(1, &gl->fbo);
SDL_QuitSubSystem(SDL_INIT_VIDEO);
}
@ -513,6 +574,10 @@ static void* gl_init(video_info_t *video, const input_driver_t **input, void **i
gl->win_width = video->width;
gl->win_height = video->height;
}
// Set up render to texture.
gl_init_fbo(gl, 2 * 256 * video->input_scale, 2 * 256 * video->input_scale);
SSNES_LOG("GL: Using resolution %ux%u\n", gl->win_width, gl->win_height);
gl->vsync = video->vsync;
@ -530,7 +595,7 @@ static void* gl_init(video_info_t *video, const input_driver_t **input, void **i
// Remove that ugly mouse :D
SDL_ShowCursor(SDL_DISABLE);
if ( video->smooth )
if (video->smooth)
gl->tex_filter = GL_LINEAR;
else
gl->tex_filter = GL_NEAREST;
@ -564,7 +629,7 @@ static void* gl_init(video_info_t *video, const input_driver_t **input, void **i
gl->tex_w = 256 * video->input_scale;
gl->tex_h = 256 * video->input_scale;
uint8_t *tmp = calloc(1, gl->tex_w * gl->tex_h * sizeof(uint16_t));
uint8_t *tmp = calloc(1, gl->tex_w * gl->tex_h * sizeof(uint32_t));
glTexImage2D(GL_TEXTURE_2D,
0, GL_RGBA, gl->tex_w, gl->tex_h, 0, GL_BGRA,
GL_UNSIGNED_SHORT_1_5_5_5_REV, tmp);