X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcore%2Fsampler.cpp;fp=source%2Fcore%2Fsampler.cpp;h=5375d17dfc5072d9108334b1627e930449da5e4d;hb=7aaec9a70b8d7733429bec043f8e33e02956f266;hp=0000000000000000000000000000000000000000;hpb=bec07999d95b76f4b47cffcc564d0cd0afc0435e;p=libs%2Fgl.git

diff --git a/source/core/sampler.cpp b/source/core/sampler.cpp
new file mode 100644
index 00000000..5375d17d
--- /dev/null
+++ b/source/core/sampler.cpp
@@ -0,0 +1,332 @@
+#include <msp/gl/extensions/arb_direct_state_access.h>
+#include <msp/gl/extensions/arb_sampler_objects.h>
+#include <msp/gl/extensions/arb_shadow.h>
+#include <msp/gl/extensions/ext_texture_filter_anisotropic.h>
+#include <msp/gl/extensions/ext_texture3d.h>
+#include <msp/strings/format.h>
+#include "error.h"
+#include "sampler.h"
+#include "texture.h"
+#include "texunit.h"
+
+using namespace std;
+
+namespace Msp {
+namespace GL {
+
+Sampler::Sampler():
+	owner(0)
+{
+	init();
+
+	Require _req(ARB_sampler_objects);
+	if(ARB_direct_state_access)
+		glCreateSamplers(1, &id);
+	else
+		glGenSamplers(1, &id);
+}
+
+Sampler::Sampler(const Texture &tex):
+	id(0),
+	owner(&tex)
+{
+	if(this!=&tex.get_default_sampler())
+		throw invalid_argument("Sampler::Sampler");
+
+	init();
+}
+
+void Sampler::init()
+{
+	min_filter = NEAREST_MIPMAP_LINEAR;
+	mag_filter = LINEAR;
+	max_anisotropy = 1.0f;
+	wrap_s = REPEAT;
+	wrap_t = REPEAT;
+	wrap_r = REPEAT;
+	compare = false;
+	cmp_func = LEQUAL;
+	dirty_params = 0;
+}
+
+void Sampler::update_parameter(int mask) const
+{
+	if(owner)
+	{
+		if(!owner->get_id())
+		{
+			dirty_params |= mask;
+			return;
+		}
+
+		if(!ARB_direct_state_access && TexUnit::current().get_texture()!=owner)
+		{
+			TexUnit *unit = TexUnit::find_unit(owner);
+			if(!unit)
+			{
+				dirty_params |= mask;
+				return;
+			}
+
+			unit->bind();
+		}
+	}
+
+	if(mask&MIN_FILTER)
+		set_parameter_i(GL_TEXTURE_MIN_FILTER, min_filter);
+	if(mask&MAG_FILTER)
+		set_parameter_i(GL_TEXTURE_MAG_FILTER, mag_filter);
+	if(mask&MAX_ANISOTROPY)
+		set_parameter_f(GL_TEXTURE_MAX_ANISOTROPY_EXT, max_anisotropy);
+	if(mask&WRAP_S)
+		set_parameter_i(GL_TEXTURE_WRAP_S, wrap_s);
+	if(mask&WRAP_T)
+		set_parameter_i(GL_TEXTURE_WRAP_T, wrap_t);
+	if(mask&WRAP_R)
+		set_parameter_i(GL_TEXTURE_WRAP_R, wrap_r);
+	if(mask&COMPARE)
+	{
+		set_parameter_i(GL_TEXTURE_COMPARE_MODE, (compare ? GL_COMPARE_R_TO_TEXTURE : GL_NONE));
+		if(compare)
+			set_parameter_i(GL_TEXTURE_COMPARE_FUNC, cmp_func);
+	}
+}
+
+void Sampler::set_parameter_i(unsigned param, int value) const
+{
+	if(id)
+		glSamplerParameteri(id, param, value);
+	else if(ARB_direct_state_access)
+		glTextureParameteri(owner->get_id(), param, value);
+	else
+		glTexParameteri(owner->get_target(), param, value);
+}
+
+void Sampler::set_parameter_f(unsigned param, float value) const
+{
+	if(id)
+		glSamplerParameterf(id, param, value);
+	else if(ARB_direct_state_access)
+		glTextureParameterf(owner->get_id(), param, value);
+	else
+		glTexParameterf(owner->get_target(), param, value);
+}
+
+void Sampler::set_min_filter(TextureFilter f)
+{
+	min_filter = f;
+	update_parameter(MIN_FILTER);
+}
+
+void Sampler::set_mag_filter(TextureFilter f)
+{
+	mag_filter = f;
+	update_parameter(MAG_FILTER);
+}
+
+void Sampler::set_filter(TextureFilter f)
+{
+	set_min_filter(f);
+	set_mag_filter(f==NEAREST ? NEAREST : LINEAR);
+}
+
+void Sampler::set_max_anisotropy(float a)
+{
+	if(a<1.0f)
+		throw invalid_argument("Sampler::set_max_anisotropy");
+	else if(a>1.0f)
+		static Require _req(EXT_texture_filter_anisotropic);
+	max_anisotropy = a;
+	if(EXT_texture_filter_anisotropic)
+		update_parameter(MAX_ANISOTROPY);
+}
+
+void Sampler::set_wrap(TextureWrap w)
+{
+	set_wrap_s(w);
+	set_wrap_t(w);
+	if(EXT_texture3D)
+		set_wrap_r(w);
+}
+
+void Sampler::set_wrap_s(TextureWrap w)
+{
+	wrap_s = w;
+	update_parameter(WRAP_S);
+}
+
+void Sampler::set_wrap_t(TextureWrap w)
+{
+	wrap_t = w;
+	update_parameter(WRAP_T);
+}
+
+void Sampler::set_wrap_r(TextureWrap w)
+{
+	static Require _req(EXT_texture3D);
+	wrap_r = w;
+	update_parameter(WRAP_R);
+}
+
+void Sampler::disable_compare()
+{
+	compare = false;
+	update_parameter(COMPARE);
+}
+
+void Sampler::set_compare(Predicate f)
+{
+	static Require _req(ARB_shadow);
+	compare = true;
+	cmp_func = f;
+	update_parameter(COMPARE);
+}
+
+void Sampler::bind_to(unsigned i) const
+{
+	TexUnit &unit = TexUnit::get_unit(i);
+	if(owner && owner!=unit.get_texture())
+		throw invalid_operation("Sampler::bind_to");
+
+	const Sampler *cur = unit.get_sampler();
+	if(unit.set_sampler(this))
+	{
+		if(!owner || (cur && cur->id))
+			glBindSampler(i, id);
+
+		if(dirty_params)
+		{
+			update_parameter(dirty_params);
+			dirty_params = 0;
+		}
+	}
+}
+
+const Sampler *Sampler::current(unsigned i)
+{
+	return TexUnit::get_unit(i).get_sampler();
+}
+
+void Sampler::unbind_from(unsigned i)
+{
+	TexUnit &unit = TexUnit::get_unit(i);
+	const Sampler *cur = unit.get_sampler();
+	if(unit.set_sampler(0) && cur->id)
+		glBindSampler(i, 0);
+}
+
+void Sampler::unload()
+{
+	if(owner && !owner->get_id())
+	{
+		if(min_filter!=NEAREST_MIPMAP_LINEAR)
+			dirty_params |= MIN_FILTER;
+		if(mag_filter!=LINEAR)
+			dirty_params |= MAG_FILTER;
+		if(max_anisotropy!=1.0f)
+			dirty_params |= MAX_ANISOTROPY;
+		if(wrap_s!=REPEAT)
+			dirty_params |= WRAP_S;
+		if(wrap_t!=REPEAT)
+			dirty_params |= WRAP_T;
+		if(wrap_r!=REPEAT)
+			dirty_params |= WRAP_R;
+		if(compare || cmp_func!=LEQUAL)
+			dirty_params |= COMPARE;
+	}
+}
+
+
+Sampler::Loader::Loader(Sampler &s):
+	DataFile::ObjectLoader<Sampler>(s)
+{
+	add("filter", &Loader::filter);
+	add("mag_filter", &Loader::mag_filter);
+	add("max_anisotropy", &Loader::max_anisotropy);
+	add("min_filter", &Loader::min_filter);
+	add("wrap", &Loader::wrap);
+	add("wrap_r", &Loader::wrap_r);
+	add("wrap_s", &Loader::wrap_s);
+	add("wrap_t", &Loader::wrap_t);
+}
+
+void Sampler::Loader::filter(TextureFilter f)
+{
+	obj.set_filter(f);
+}
+
+void Sampler::Loader::mag_filter(TextureFilter f)
+{
+	obj.set_mag_filter(f);
+}
+
+void Sampler::Loader::max_anisotropy(float a)
+{
+	obj.set_max_anisotropy(a);
+}
+
+void Sampler::Loader::min_filter(TextureFilter f)
+{
+	obj.set_min_filter(f);
+}
+
+void Sampler::Loader::wrap(TextureWrap w)
+{
+	obj.set_wrap(w);
+}
+
+void Sampler::Loader::wrap_r(TextureWrap w)
+{
+	obj.set_wrap_r(w);
+}
+
+void Sampler::Loader::wrap_s(TextureWrap w)
+{
+	obj.set_wrap_s(w);
+}
+
+void Sampler::Loader::wrap_t(TextureWrap w)
+{
+	obj.set_wrap_t(w);
+}
+
+
+bool is_mipmapped(TextureFilter filter)
+{
+	return (filter==NEAREST_MIPMAP_NEAREST || filter==NEAREST_MIPMAP_LINEAR ||
+		filter==LINEAR_MIPMAP_NEAREST || filter==LINEAR_MIPMAP_LINEAR);
+}
+
+void operator>>(const LexicalConverter &c, TextureFilter &tf)
+{
+	if(c.get()=="NEAREST")
+		tf = NEAREST;
+	else if(c.get()=="LINEAR")
+		tf = LINEAR;
+	else if(c.get()=="NEAREST_MIPMAP_NEAREST")
+		tf = NEAREST_MIPMAP_NEAREST;
+	else if(c.get()=="NEAREST_MIPMAP_LINEAR")
+		tf = NEAREST_MIPMAP_LINEAR;
+	else if(c.get()=="LINEAR_MIPMAP_NEAREST")
+		tf = LINEAR_MIPMAP_NEAREST;
+	else if(c.get()=="LINEAR_MIPMAP_LINEAR")
+		tf = LINEAR_MIPMAP_LINEAR;
+	else
+		throw lexical_error(format("conversion of '%s' to TextureFilter", c.get()));
+}
+
+void operator>>(const LexicalConverter &c, TextureWrap &tw)
+{
+	if(c.get()=="REPEAT")
+		tw = REPEAT;
+	else if(c.get()=="CLAMP_TO_EDGE")
+		tw = CLAMP_TO_EDGE;
+	else if(c.get()=="MIRRORED_REPEAT")
+		tw = MIRRORED_REPEAT;
+	else
+		throw lexical_error(format("conversion of '%s' to TextureWrap", c.get()));
+}
+
+
+} // namespace GL
+} // namespace Msp