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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// This file contains the implementation for SamplerGLES2.
#include "core/cross/gles2/gles2_headers.h"
#include "core/cross/error.h"
#include "core/cross/gles2/renderer_gles2.h"
#include "core/cross/gles2/sampler_gles2.h"
namespace o3d {
SamplerGLES2::SamplerGLES2(ServiceLocator* service_locator)
: Sampler(service_locator),
renderer_(static_cast<RendererGLES2*>(
service_locator->GetService<Renderer>())) {
}
SamplerGLES2::~SamplerGLES2() {
}
namespace {
unsigned int GLAddressMode(Sampler::AddressMode o3d_mode,
unsigned int default_mode) {
unsigned int gl_mode = default_mode;
switch (o3d_mode) {
case Sampler::WRAP:
gl_mode = GL_REPEAT;
break;
case Sampler::MIRROR:
gl_mode = GL_MIRRORED_REPEAT;
break;
case Sampler::CLAMP:
gl_mode = GL_CLAMP_TO_EDGE;
break;
case Sampler::BORDER:
gl_mode = GL_CLAMP_TO_BORDER;
break;
default:
DLOG(ERROR) << "Unknown Address mode " << static_cast<int>(o3d_mode);
break;
}
return gl_mode;
}
unsigned int GLMinFilter(Sampler::FilterType o3d_filter,
Sampler::FilterType mip_filter) {
switch (o3d_filter) {
case Sampler::NONE:
return GL_NEAREST;
case Sampler::POINT:
if (mip_filter == Sampler::NONE)
return GL_NEAREST;
else if (mip_filter == Sampler::POINT)
return GL_NEAREST_MIPMAP_NEAREST;
else if (mip_filter == Sampler::LINEAR)
return GL_NEAREST_MIPMAP_LINEAR;
else if (mip_filter == Sampler::ANISOTROPIC)
return GL_NEAREST_MIPMAP_LINEAR;
case Sampler::ANISOTROPIC: // Anisotropy is handled in SetTextureAndStates
case Sampler::LINEAR:
if (mip_filter == Sampler::NONE)
return GL_LINEAR;
else if (mip_filter == Sampler::POINT)
return GL_LINEAR_MIPMAP_NEAREST;
else if (mip_filter == Sampler::LINEAR)
return GL_LINEAR_MIPMAP_LINEAR;
else if (mip_filter == Sampler::ANISOTROPIC)
return GL_LINEAR_MIPMAP_LINEAR;
}
// fall through
DLOG(ERROR) << "Unknown filter " << static_cast<int>(o3d_filter);
DCHECK(false);
return GL_NONE;
}
unsigned int GLMagFilter(Sampler::FilterType o3d_filter) {
switch (o3d_filter) {
case Sampler::NONE:
case Sampler::POINT:
return GL_NEAREST;
case Sampler::LINEAR:
case Sampler::ANISOTROPIC:
return GL_LINEAR;
default:
DLOG(ERROR) << "Unknown filter " << static_cast<int>(o3d_filter);
return GL_LINEAR;
}
}
GLenum GLTextureTarget(Texture* texture) {
if (texture->IsA(Texture2D::GetApparentClass())) {
return GL_TEXTURE_2D;
} else if (texture->IsA(TextureCUBE::GetApparentClass())) {
return GL_TEXTURE_CUBE_MAP;
} else {
DLOG(ERROR) << "Unknown texture target";
return 0;
}
}
} // namespace
void SamplerGLES2::SetTextureAndStates(CGparameter cg_param) {
// Get the texture object associated with this sampler.
Texture* texture_object = texture();
if (!texture_object) {
texture_object = renderer_->error_texture();
if (!texture_object) {
O3D_ERROR(service_locator())
<< "Missing texture for sampler " << name();
texture_object = renderer_->fallback_error_texture();
}
}
if (!renderer_->SafeToBindTexture(texture_object)) {
O3D_ERROR(renderer_->service_locator())
<< "Attempt to bind texture, " << texture_object->name()
<< " when drawing to same texture as a RenderSurface";
texture_object = renderer_->error_texture();
}
GLuint handle = static_cast<GLuint>(reinterpret_cast<intptr_t>(
texture_object->GetTextureHandle()));
if (handle) {
cgGLSetTextureParameter(cg_param, handle);
cgGLEnableTextureParameter(cg_param);
} else {
cgGLSetTextureParameter(cg_param, 0);
cgGLDisableTextureParameter(cg_param);
return;
}
// TODO(o3d): this is a slow check and needs to be moved to initialization
// time.
GLenum target = GLTextureTarget(texture_object);
if (target) {
GLenum texture_unit = cgGLGetTextureEnum(cg_param);
::glActiveTextureARB(texture_unit);
glBindTexture(target, handle);
glTexParameteri(target,
GL_TEXTURE_WRAP_S,
GLAddressMode(address_mode_u(), GL_REPEAT));
glTexParameteri(target,
GL_TEXTURE_WRAP_T,
GLAddressMode(address_mode_v(), GL_REPEAT));
if (texture_object->IsA(TextureCUBE::GetApparentClass())) {
glTexParameteri(target,
GL_TEXTURE_WRAP_R,
GLAddressMode(address_mode_w(), GL_REPEAT));
}
glTexParameteri(target,
GL_TEXTURE_MIN_FILTER,
GLMinFilter(min_filter(), mip_filter()));
glTexParameteri(target,
GL_TEXTURE_MAG_FILTER,
GLMagFilter(mag_filter()));
Float4 color = border_color();
GLfloat gl_color[4] = {color[0], color[1], color[2], color[3]};
glTexParameterfv(target, GL_TEXTURE_BORDER_COLOR, gl_color);
// Check for anisotropic texture filtering.
if (GLEW_EXT_texture_filter_anisotropic) {
int gl_max_anisotropy =
(min_filter() == ANISOTROPIC) ? max_anisotropy() : 1;
glTexParameteri(target, GL_TEXTURE_MAX_ANISOTROPY_EXT, gl_max_anisotropy);
}
}
}
void SamplerGLES2::ResetTexture(CGparameter cg_param) {
Texture* the_texture = texture();
if (the_texture) {
// TODO(o3d): this is a slow check and needs to be moved to initialization
// time.
GLenum target = GLTextureTarget(the_texture);
if (target) {
GLenum texture_unit = cgGLGetTextureEnum(cg_param);
glActiveTextureARB(texture_unit);
glBindTexture(target, 0);
}
}
}
} // namespace o3d
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