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/* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
/**
* \file piglit-fbo.h
* This file declares classes to initialize a framebuffer object as per piglit
* test's requirements.
*/
#include "piglit-util-gl.h"
#include "math.h"
namespace piglit_util_fbo {
/* I think 16 is the sufficient number of color attachments which tests would
* want to use in near future.
*/
#define PIGLIT_MAX_COLOR_ATTACHMENTS 16
/**
* Information needed to configure a framebuffer object for MSAA
* testing.
*/
class FboConfig
{
public:
FboConfig(int num_samples, int width, int height);
int num_samples;
int num_rb_attachments; /* Default value is 1 */
int num_tex_attachments; /* Default value is 0 */
int width;
int height;
/**
* If non-zero, GL_TEXTURE_2D_MULTISAMPLE_ARRAY is used with
* the specified number of layers instead of
* GL_TEXTURE_2D_MULTISAMPLE.
*
* Default value is zero.
*/
unsigned layers;
/**
* If true, GL_TEXTURE_RECTANGLE is used when creating and
* binding textures
*
* Default value is true if num_samples == 0.
*/
bool use_rect;
/**
* Specifies the layer of the texture that should be attached
* to the framebuffer. This must be less than the value of
* ::layers (unless ::layers is zero).
*
* Default value is zero.
*/
unsigned attachment_layer;
/**
* True if a single renderbuffer should be used as the backing
* store for both the depth and stencil attachment points.
* Defaults to true.
*/
bool combine_depth_stencil;
/**
* Set color attachment points for color_tex[i] or color_rb[i].
* Default value for color_tex[0] and color_rb[0] is
* GL_COLOR_ATTACHMENT0.
*/
GLuint rb_attachment[PIGLIT_MAX_COLOR_ATTACHMENTS];
GLuint tex_attachment[PIGLIT_MAX_COLOR_ATTACHMENTS];
/**
* Useful if num_tex_attachments > 0 and color buffer is
* non-multisample. Specifies the format that should be used
* for the color buffer, or GL_NONE if no color buffer should
* be used. Defaults to GL_RGBA.
*/
GLenum color_format;
/**
* Internalformat that should be used for the color buffer, or
* GL_NONE if no color buffer should be used. Defaults to
* GL_RGBA.
*/
GLenum color_internalformat;
/**
* Internalformat that should be used for the depth buffer, or
* GL_NONE if no depth buffer should be used. Ignored if
* combine_depth_stencil is true. Defaults to
* GL_DEPTH_COMPONENT24.
*/
GLenum depth_internalformat;
/**
* Internalformat that should be used for the stencil buffer,
* or GL_NONE if no stencil buffer should be used. Ignored if
* combine_depth_stencil is true. Defaults to
* GL_STENCIL_INDEX8.
*/
GLenum stencil_internalformat;
};
/**
* Data structure representing one of the framebuffer objects used in
* the test.
*
* For the supersampled framebuffer object we use a texture as the
* backing store for the color buffer so that we can use a fragment
* shader to blend down to the reference image.
*/
class Fbo
{
public:
Fbo();
void set_samples(int num_samples);
void setup(const FboConfig &new_config);
bool try_setup(const FboConfig &new_config);
void set_viewport();
FboConfig config;
GLuint handle;
/**
* If config.num_tex_attachments > 0, the backing store for the
* color buffers.
*/
GLuint color_tex[PIGLIT_MAX_COLOR_ATTACHMENTS];
/**
* If config.num_rb_attachments > 0, the backing store for the
* color buffers.
*/
GLuint color_rb[PIGLIT_MAX_COLOR_ATTACHMENTS];
/**
* If config.combine_depth_stencil is true, the backing store
* for the depth/stencil buffer. If
* config.combine_depth_stencil is false, the backing store
* for the depth buffer.
*/
GLuint depth_rb;
/**
* If config.combine_depth_stencil is false, the backing store
* for the stencil buffer.
*/
GLuint stencil_rb;
private:
void generate_gl_objects();
void attach_color_renderbuffer(const FboConfig &config,
int index);
void attach_color_texture(const FboConfig &config, int index);
void attach_multisample_color_texture(const FboConfig &config,
int index);
/**
* True if generate_gl_objects has been called and color_tex,
* color_rb, depth_rb, and stencil_rb have been initialized.
*/
bool gl_objects_generated;
};
}
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