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Cache bound fbos, allow unbinding only read.

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This maintains the currently bound fbos, similar to glstate.
So long as these funcs are used, it can prevent duplicate binds.

Binding the same buffer twice comes with a performance penalty.
This commit is contained in:
Unknown W. Brackets 2014-08-27 22:58:11 -07:00
parent 196facb355
commit f1ec201dbc
2 changed files with 60 additions and 36 deletions
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94
gfx_es2/fbo.cpp
View File

@ -43,6 +43,9 @@ struct FBO {
static FBO *g_overriddenBackbuffer;
static GLuint currentDrawHandle_ = 0;
static GLuint currentReadHandle_ = 0;
// On PC, we always use GL_DEPTH24_STENCIL8.
// On Android, we try to use what's available.
@ -118,6 +121,9 @@ FBO *fbo_ext_create(int width, int height, int num_color_textures, bool z_stenci
// Unbind state we don't need
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, 0);
glBindTexture(GL_TEXTURE_2D, 0);
currentDrawHandle_ = fbo->handle;
currentReadHandle_ = fbo->handle;
return fbo;
}
#endif
@ -237,6 +243,9 @@ FBO *fbo_create(int width, int height, int num_color_textures, bool z_stencil, F
// Unbind state we don't need
glBindRenderbuffer(GL_RENDERBUFFER, 0);
glBindTexture(GL_TEXTURE_2D, 0);
currentDrawHandle_ = fbo->handle;
currentReadHandle_ = fbo->handle;
return fbo;
}
@ -258,6 +267,37 @@ FBO *fbo_create_from_native_fbo(GLuint native_fbo, FBO *fbo)
return fbo;
}
static GLenum fbo_get_fb_target(bool read, GLuint **cached) {
bool supportsBlit = gl_extensions.FBO_ARB;
#ifdef USING_GLES2
supportsBlit = supportsBlit && (gl_extensions.GLES3 || gl_extensions.NV_framebuffer_blit);
#endif
// Note: GL_FRAMEBUFFER_EXT and GL_FRAMEBUFFER have the same value, same with _NV.
if (supportsBlit) {
if (read) {
*cached = &currentReadHandle_;
return GL_READ_FRAMEBUFFER;
} else {
*cached = &currentDrawHandle_;
return GL_DRAW_FRAMEBUFFER;
}
} else {
*cached = &currentDrawHandle_;
return GL_FRAMEBUFFER;
}
}
static void fbo_bind_fb_target(bool read, GLuint name) {
GLuint *cached;
GLenum target = fbo_get_fb_target(read, &cached);
if (*cached != name) {
glBindFramebuffer(target, name);
*cached = name;
}
}
void fbo_unbind() {
if (g_overriddenBackbuffer) {
fbo_bind_as_render_target(g_overriddenBackbuffer);
@ -275,6 +315,9 @@ void fbo_unbind() {
#ifdef IOS
bindDefaultFBO();
#endif
currentDrawHandle_ = 0;
currentReadHandle_ = 0;
}
void fbo_override_backbuffer(FBO *fbo) {
@ -282,48 +325,24 @@ void fbo_override_backbuffer(FBO *fbo) {
}
void fbo_bind_as_render_target(FBO *fbo) {
if (gl_extensions.FBO_ARB) {
#ifndef USING_GLES2
if (true) {
#else
if (gl_extensions.GLES3) {
#endif
// GL_DRAW_FRAMEBUFFER is actually the same value as GL_FRAMEBUFFER so this is a bit redundant.
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo->handle);
} else {
// This will collide with bind_for_read - but there's nothing in ES 2.0
// that actually separate them anyway of course, so doesn't matter.
glBindFramebuffer(GL_FRAMEBUFFER, fbo->handle);
}
}else{
#ifndef USING_GLES2
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo->handle);
#endif
}
// Without FBO_ARB / GLES3, this will collide with bind_for_read, but there's nothing
// in ES 2.0 that actually separate them anyway of course, so doesn't matter.
fbo_bind_fb_target(false, fbo->handle);
// Always restore viewport after render target binding
glstate.viewport.restore();
}
void fbo_unbind_render_target() {
fbo_unbind();
}
// For GL_EXT_FRAMEBUFFER_BLIT and similar.
void fbo_bind_for_read(FBO *fbo) {
if (gl_extensions.FBO_ARB) {
#ifndef USING_GLES2
if (true) {
#else
if (gl_extensions.GLES3 || gl_extensions.NV_framebuffer_blit) {
#endif
// GL_READ_FRAMEBUFFER is defined to the same value as GL_READ_FRAMEBUFFER_NV.
glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo->handle);
} else {
// This will collide with bind_as_render_target - but there's nothing in ES 2.0
// that actually separate them anyway of course, so doesn't matter.
glBindFramebuffer(GL_FRAMEBUFFER, fbo->handle);
}
} else {
#ifndef USING_GLES2
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbo->handle);
#endif
}
fbo_bind_fb_target(true, fbo->handle);
}
void fbo_unbind_read() {
fbo_bind_fb_target(true, 0);
}
void fbo_bind_color_as_texture(FBO *fbo, int color) {
@ -358,6 +377,9 @@ void fbo_destroy(FBO *fbo) {
#endif
}
currentDrawHandle_ = 0;
currentReadHandle_ = 0;
glDeleteTextures(1, &fbo->color_texture);
delete fbo;
}

2
gfx_es2/fbo.h
View File

@ -36,6 +36,8 @@ void fbo_bind_as_render_target(FBO *fbo);
void fbo_bind_color_as_texture(FBO *fbo, int color);
void fbo_bind_for_read(FBO *fbo);
void fbo_unbind();
void fbo_unbind_render_target();
void fbo_unbind_read();
void fbo_destroy(FBO *fbo);
void fbo_get_dimensions(FBO *fbo, int *w, int *h);