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mutter-performance-source/cogl/cogl-pipeline-state.h
Neil Roberts 2933423ca7 Don't generate GLSL for the point size for default pipelines 
Previously on GLES2 where there is no builtin point size uniform then
we would always add a line to the vertex shader to write to the
builtin point size output because when generating the shader it is not
possible to determine if the pipeline will be used to draw points or
not. This patch changes it so that the default point size is 0.0f
which is documented to have undefined results when drawing points.
That way we can avoid adding the point size code to the shader in that
case. The assumption is that any application that is drawing points
will probably have explicitly set the point size on the pipeline
anyway so it is not a big deal to change the default size from 1.0f.

This adds a new pipeline state flag to track whether the point size is
non-zero. This needs to be its own state because altering it needs to
cause a different shader to be added to the pipeline cache. The state
flags that affect the vertex shader have been changed from a constant
to a runtime function because they will be different depending on
whether there is a builtin point size uniform.

There is also a unit test to ensure that changing the point size does
or doesn't generate a new shader depending on the values.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit b2eba06e16b587acbf5c57944a70ceccecb4f175)

Conflicts:
	cogl/cogl-pipeline-private.h
	cogl/cogl-pipeline-state-private.h
	cogl/cogl-pipeline-state.c
	cogl/cogl-pipeline.c
2013-06-21 14:18:37 +01:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009,2011 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif
#ifndef __COGL_PIPELINE_STATE_H__
#define __COGL_PIPELINE_STATE_H__
#include <cogl/cogl-pipeline.h>
#include <cogl/cogl-color.h>
#include <cogl/cogl-depth-state.h>
COGL_BEGIN_DECLS
#ifdef COGL_ENABLE_EXPERIMENTAL_API
/**
* cogl_pipeline_set_color:
* @pipeline: A #CoglPipeline object
* @color: The components of the color
*
* Sets the basic color of the pipeline, used when no lighting is enabled.
*
* Note that if you don't add any layers to the pipeline then the color
* will be blended unmodified with the destination; the default blend
* expects premultiplied colors: for example, use (0.5, 0.0, 0.0, 0.5) for
* semi-transparent red. See cogl_color_premultiply().
*
* The default value is (1.0, 1.0, 1.0, 1.0)
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_color (CoglPipeline *pipeline,
const CoglColor *color);
/**
* cogl_pipeline_set_color4ub:
* @pipeline: A #CoglPipeline object
* @red: The red component
* @green: The green component
* @blue: The blue component
* @alpha: The alpha component
*
* Sets the basic color of the pipeline, used when no lighting is enabled.
*
* The default value is (0xff, 0xff, 0xff, 0xff)
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_color4ub (CoglPipeline *pipeline,
uint8_t red,
uint8_t green,
uint8_t blue,
uint8_t alpha);
/**
* cogl_pipeline_set_color4f:
* @pipeline: A #CoglPipeline object
* @red: The red component
* @green: The green component
* @blue: The blue component
* @alpha: The alpha component
*
* Sets the basic color of the pipeline, used when no lighting is enabled.
*
* The default value is (1.0, 1.0, 1.0, 1.0)
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_color4f (CoglPipeline *pipeline,
float red,
float green,
float blue,
float alpha);
/**
* cogl_pipeline_get_color:
* @pipeline: A #CoglPipeline object
* @color: (out): The location to store the color
*
* Retrieves the current pipeline color.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_get_color (CoglPipeline *pipeline,
CoglColor *color);
/**
* cogl_pipeline_set_ambient:
* @pipeline: A #CoglPipeline object
* @ambient: The components of the desired ambient color
*
* Sets the pipeline's ambient color, in the standard OpenGL lighting
* model. The ambient color affects the overall color of the object.
*
* Since the diffuse color will be intense when the light hits the surface
* directly, the ambient will be most apparent where the light hits at a
* slant.
*
* The default value is (0.2, 0.2, 0.2, 1.0)
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_ambient (CoglPipeline *pipeline,
const CoglColor *ambient);
/**
* cogl_pipeline_get_ambient:
* @pipeline: A #CoglPipeline object
* @ambient: The location to store the ambient color
*
* Retrieves the current ambient color for @pipeline
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_get_ambient (CoglPipeline *pipeline,
CoglColor *ambient);
/**
* cogl_pipeline_set_diffuse:
* @pipeline: A #CoglPipeline object
* @diffuse: The components of the desired diffuse color
*
* Sets the pipeline's diffuse color, in the standard OpenGL lighting
* model. The diffuse color is most intense where the light hits the
* surface directly - perpendicular to the surface.
*
* The default value is (0.8, 0.8, 0.8, 1.0)
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_diffuse (CoglPipeline *pipeline,
const CoglColor *diffuse);
/**
* cogl_pipeline_get_diffuse:
* @pipeline: A #CoglPipeline object
* @diffuse: The location to store the diffuse color
*
* Retrieves the current diffuse color for @pipeline
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_get_diffuse (CoglPipeline *pipeline,
CoglColor *diffuse);
/**
* cogl_pipeline_set_ambient_and_diffuse:
* @pipeline: A #CoglPipeline object
* @color: The components of the desired ambient and diffuse colors
*
* Conveniently sets the diffuse and ambient color of @pipeline at the same
* time. See cogl_pipeline_set_ambient() and cogl_pipeline_set_diffuse().
*
* The default ambient color is (0.2, 0.2, 0.2, 1.0)
*
* The default diffuse color is (0.8, 0.8, 0.8, 1.0)
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_ambient_and_diffuse (CoglPipeline *pipeline,
const CoglColor *color);
/**
* cogl_pipeline_set_specular:
* @pipeline: A #CoglPipeline object
* @specular: The components of the desired specular color
*
* Sets the pipeline's specular color, in the standard OpenGL lighting
* model. The intensity of the specular color depends on the viewport
* position, and is brightest along the lines of reflection.
*
* The default value is (0.0, 0.0, 0.0, 1.0)
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_specular (CoglPipeline *pipeline,
const CoglColor *specular);
/**
* cogl_pipeline_get_specular:
* @pipeline: A #CoglPipeline object
* @specular: The location to store the specular color
*
* Retrieves the pipelines current specular color.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_get_specular (CoglPipeline *pipeline,
CoglColor *specular);
/**
* cogl_pipeline_set_shininess:
* @pipeline: A #CoglPipeline object
* @shininess: The desired shininess; must be >= 0.0
*
* Sets the shininess of the pipeline, in the standard OpenGL lighting
* model, which determines the size of the specular highlights. A
* higher @shininess will produce smaller highlights which makes the
* object appear more shiny.
*
* The default value is 0.0
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_shininess (CoglPipeline *pipeline,
float shininess);
/**
* cogl_pipeline_get_shininess:
* @pipeline: A #CoglPipeline object
*
* Retrieves the pipelines current emission color.
*
* Return value: The pipelines current shininess value
*
* Since: 2.0
* Stability: Unstable
*/
float
cogl_pipeline_get_shininess (CoglPipeline *pipeline);
/**
* cogl_pipeline_set_emission:
* @pipeline: A #CoglPipeline object
* @emission: The components of the desired emissive color
*
* Sets the pipeline's emissive color, in the standard OpenGL lighting
* model. It will look like the surface is a light source emitting this
* color.
*
* The default value is (0.0, 0.0, 0.0, 1.0)
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_emission (CoglPipeline *pipeline,
const CoglColor *emission);
/**
* cogl_pipeline_get_emission:
* @pipeline: A #CoglPipeline object
* @emission: The location to store the emission color
*
* Retrieves the pipelines current emission color.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_get_emission (CoglPipeline *pipeline,
CoglColor *emission);
/**
* CoglPipelineAlphaFunc:
* @COGL_PIPELINE_ALPHA_FUNC_NEVER: Never let the fragment through.
* @COGL_PIPELINE_ALPHA_FUNC_LESS: Let the fragment through if the incoming
* alpha value is less than the reference alpha value
* @COGL_PIPELINE_ALPHA_FUNC_EQUAL: Let the fragment through if the incoming
* alpha value equals the reference alpha value
* @COGL_PIPELINE_ALPHA_FUNC_LEQUAL: Let the fragment through if the incoming
* alpha value is less than or equal to the reference alpha value
* @COGL_PIPELINE_ALPHA_FUNC_GREATER: Let the fragment through if the incoming
* alpha value is greater than the reference alpha value
* @COGL_PIPELINE_ALPHA_FUNC_NOTEQUAL: Let the fragment through if the incoming
* alpha value does not equal the reference alpha value
* @COGL_PIPELINE_ALPHA_FUNC_GEQUAL: Let the fragment through if the incoming
* alpha value is greater than or equal to the reference alpha value.
* @COGL_PIPELINE_ALPHA_FUNC_ALWAYS: Always let the fragment through.
*
* Alpha testing happens before blending primitives with the framebuffer and
* gives an opportunity to discard fragments based on a comparison with the
* incoming alpha value and a reference alpha value. The #CoglPipelineAlphaFunc
* determines how the comparison is done.
*/
typedef enum {
COGL_PIPELINE_ALPHA_FUNC_NEVER = 0x0200,
COGL_PIPELINE_ALPHA_FUNC_LESS = 0x0201,
COGL_PIPELINE_ALPHA_FUNC_EQUAL = 0x0202,
COGL_PIPELINE_ALPHA_FUNC_LEQUAL = 0x0203,
COGL_PIPELINE_ALPHA_FUNC_GREATER = 0x0204,
COGL_PIPELINE_ALPHA_FUNC_NOTEQUAL = 0x0205,
COGL_PIPELINE_ALPHA_FUNC_GEQUAL = 0x0206,
COGL_PIPELINE_ALPHA_FUNC_ALWAYS = 0x0207
} CoglPipelineAlphaFunc;
/* NB: these values come from the equivalents in gl.h */
/**
* cogl_pipeline_set_alpha_test_function:
* @pipeline: A #CoglPipeline object
* @alpha_func: A @CoglPipelineAlphaFunc constant
* @alpha_reference: A reference point that the chosen alpha function uses
* to compare incoming fragments to.
*
* Before a primitive is blended with the framebuffer, it goes through an
* alpha test stage which lets you discard fragments based on the current
* alpha value. This function lets you change the function used to evaluate
* the alpha channel, and thus determine which fragments are discarded
* and which continue on to the blending stage.
*
* The default is %COGL_PIPELINE_ALPHA_FUNC_ALWAYS
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_alpha_test_function (CoglPipeline *pipeline,
CoglPipelineAlphaFunc alpha_func,
float alpha_reference);
/**
* cogl_pipeline_get_alpha_test_function:
* @pipeline: A #CoglPipeline object
*
* Return value: The alpha test function of @pipeline.
*
* Since: 2.0
* Stability: Unstable
*/
CoglPipelineAlphaFunc
cogl_pipeline_get_alpha_test_function (CoglPipeline *pipeline);
/**
* cogl_pipeline_get_alpha_test_reference:
* @pipeline: A #CoglPipeline object
*
* Return value: The alpha test reference value of @pipeline.
*
* Since: 2.0
* Stability: Unstable
*/
float
cogl_pipeline_get_alpha_test_reference (CoglPipeline *pipeline);
/**
* cogl_pipeline_set_blend:
* @pipeline: A #CoglPipeline object
* @blend_string: A <link linkend="cogl-Blend-Strings">Cogl blend string</link>
* describing the desired blend function.
* @error: return location for a #CoglError that may report lack of driver
* support if you give separate blend string statements for the alpha
* channel and RGB channels since some drivers, or backends such as
* GLES 1.1, don't support this feature. May be %NULL, in which case a
* warning will be printed out using GLib's logging facilities if an
* error is encountered.
*
* If not already familiar; please refer <link linkend="cogl-Blend-Strings">here</link>
* for an overview of what blend strings are, and their syntax.
*
* Blending occurs after the alpha test function, and combines fragments with
* the framebuffer.
* Currently the only blend function Cogl exposes is ADD(). So any valid
* blend statements will be of the form:
*
* |[
* &lt;channel-mask&gt;=ADD(SRC_COLOR*(&lt;factor&gt;), DST_COLOR*(&lt;factor&gt;))
* ]|
*
* This is the list of source-names usable as blend factors:
* <itemizedlist>
* <listitem><para>SRC_COLOR: The color of the in comming fragment</para></listitem>
* <listitem><para>DST_COLOR: The color of the framebuffer</para></listitem>
* <listitem><para>CONSTANT: The constant set via cogl_pipeline_set_blend_constant()</para></listitem>
* </itemizedlist>
*
* The source names can be used according to the
* <link linkend="cogl-Blend-String-syntax">color-source and factor syntax</link>,
* so for example "(1-SRC_COLOR[A])" would be a valid factor, as would
* "(CONSTANT[RGB])"
*
* These can also be used as factors:
* <itemizedlist>
* <listitem>0: (0, 0, 0, 0)</listitem>
* <listitem>1: (1, 1, 1, 1)</listitem>
* <listitem>SRC_ALPHA_SATURATE_FACTOR: (f,f,f,1) where f = MIN(SRC_COLOR[A],1-DST_COLOR[A])</listitem>
* </itemizedlist>
*
* <note>Remember; all color components are normalized to the range [0, 1]
* before computing the result of blending.</note>
*
* <example id="cogl-Blend-Strings-blend-unpremul">
* <title>Blend Strings/1</title>
* <para>Blend a non-premultiplied source over a destination with
* premultiplied alpha:</para>
* <programlisting>
* "RGB = ADD(SRC_COLOR*(SRC_COLOR[A]), DST_COLOR*(1-SRC_COLOR[A]))"
* "A = ADD(SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))"
* </programlisting>
* </example>
*
* <example id="cogl-Blend-Strings-blend-premul">
* <title>Blend Strings/2</title>
* <para>Blend a premultiplied source over a destination with
* premultiplied alpha</para>
* <programlisting>
* "RGBA = ADD(SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))"
* </programlisting>
* </example>
*
* The default blend string is:
* |[
* RGBA = ADD (SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))
* ]|
*
* That gives normal alpha-blending when the calculated color for the pipeline
* is in premultiplied form.
*
* Return value: %TRUE if the blend string was successfully parsed, and the
* described blending is supported by the underlying driver/hardware. If
* there was an error, %FALSE is returned and @error is set accordingly (if
* present).
*
* Since: 2.0
* Stability: Unstable
*/
CoglBool
cogl_pipeline_set_blend (CoglPipeline *pipeline,
const char *blend_string,
CoglError **error);
/**
* cogl_pipeline_set_blend_constant:
* @pipeline: A #CoglPipeline object
* @constant_color: The constant color you want
*
* When blending is setup to reference a CONSTANT blend factor then
* blending will depend on the constant set with this function.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_blend_constant (CoglPipeline *pipeline,
const CoglColor *constant_color);
/**
* cogl_pipeline_set_point_size:
* @pipeline: a #CoglPipeline pointer
* @point_size: the new point size.
*
* Changes the size of points drawn when %COGL_VERTICES_MODE_POINTS is
* used with the attribute buffer API. Note that typically the GPU
* will only support a limited minimum and maximum range of point
* sizes. If the chosen point size is outside that range then the
* nearest value within that range will be used instead. The size of a
* point is in screen space so it will be the same regardless of any
* transformations.
*
* If the point size is set to 0.0 then drawing points with the
* pipeline will have undefined results. This is the default value so
* if an application wants to draw points it must make sure to use a
* pipeline that has an explicit point size set on it.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_point_size (CoglPipeline *pipeline,
float point_size);
/**
* cogl_pipeline_get_point_size:
* @pipeline: a #CoglPipeline pointer
*
* Get the size of points drawn when %COGL_VERTICES_MODE_POINTS is
* used with the vertex buffer API.
*
* Return value: the point size of the @pipeline.
*
* Since: 2.0
* Stability: Unstable
*/
float
cogl_pipeline_get_point_size (CoglPipeline *pipeline);
/**
* cogl_pipeline_set_per_vertex_point_size:
* @pipeline: a #CoglPipeline pointer
* @enable: whether to enable per-vertex point size
* @error: a location to store a #CoglError if the change failed
*
* Sets whether to use a per-vertex point size or to use the value set
* by cogl_pipeline_set_point_size(). If per-vertex point size is
* enabled then the point size can be set for an individual point
* either by drawing with a #CoglAttribute with the name
* ‘cogl_point_size_in’ or by writing to the GLSL builtin
* ‘cogl_point_size_out’ from a vertex shader snippet.
*
* If per-vertex point size is enabled and this attribute is not used
* and cogl_point_size_out is not written to then the results are
* undefined.
*
* Note that enabling this will only work if the
* %COGL_FEATURE_ID_PER_VERTEX_POINT_SIZE feature is available. If
* this is not available then the function will return %FALSE and set
* a #CoglError.
*
* Since: 2.0
* Stability: Unstable
* Return value: %TRUE if the change suceeded or %FALSE otherwise
*/
CoglBool
cogl_pipeline_set_per_vertex_point_size (CoglPipeline *pipeline,
CoglBool enable,
CoglError **error);
/**
* cogl_pipeline_get_per_vertex_point_size:
* @pipeline: a #CoglPipeline pointer
*
* Since: 2.0
* Stability: Unstable
* Return value: %TRUE if the pipeline has per-vertex point size
* enabled or %FALSE otherwise. The per-vertex point size can be
* enabled with cogl_pipeline_set_per_vertex_point_size().
*/
CoglBool
cogl_pipeline_get_per_vertex_point_size (CoglPipeline *pipeline);
/**
* cogl_pipeline_get_color_mask:
* @pipeline: a #CoglPipeline object.
*
* Gets the current #CoglColorMask of which channels would be written to the
* current framebuffer. Each bit set in the mask means that the
* corresponding color would be written.
*
* Returns: A #CoglColorMask
* Since: 1.8
* Stability: unstable
*/
CoglColorMask
cogl_pipeline_get_color_mask (CoglPipeline *pipeline);
/**
* cogl_pipeline_set_color_mask:
* @pipeline: a #CoglPipeline object.
* @color_mask: A #CoglColorMask of which color channels to write to
* the current framebuffer.
*
* Defines a bit mask of which color channels should be written to the
* current framebuffer. If a bit is set in @color_mask that means that
* color will be written.
*
* Since: 1.8
* Stability: unstable
*/
void
cogl_pipeline_set_color_mask (CoglPipeline *pipeline,
CoglColorMask color_mask);
/**
* cogl_pipeline_get_user_program:
* @pipeline: a #CoglPipeline object.
*
* Queries what user program has been associated with the given
* @pipeline using cogl_pipeline_set_user_program().
*
* Return value: The current user program or %COGL_INVALID_HANDLE.
*
* Since: 2.0
* Stability: Unstable
*/
CoglHandle
cogl_pipeline_get_user_program (CoglPipeline *pipeline);
/**
* cogl_pipeline_set_user_program:
* @pipeline: a #CoglPipeline object.
* @program: A #CoglHandle to a linked CoglProgram
*
* Associates a linked CoglProgram with the given pipeline so that the
* program can take full control of vertex and/or fragment processing.
*
* This is an example of how it can be used to associate an ARBfp
* program with a #CoglPipeline:
* |[
* CoglHandle shader;
* CoglHandle program;
* CoglPipeline *pipeline;
*
* shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
* cogl_shader_source (shader,
* "!!ARBfp1.0\n"
* "MOV result.color,fragment.color;\n"
* "END\n");
* cogl_shader_compile (shader);
*
* program = cogl_create_program ();
* cogl_program_attach_shader (program, shader);
* cogl_program_link (program);
*
* pipeline = cogl_pipeline_new ();
* cogl_pipeline_set_user_program (pipeline, program);
*
* cogl_set_source_color4ub (0xff, 0x00, 0x00, 0xff);
* cogl_rectangle (0, 0, 100, 100);
* ]|
*
* It is possibly worth keeping in mind that this API is not part of
* the long term design for how we want to expose shaders to Cogl
* developers (We are planning on deprecating the cogl_program and
* cogl_shader APIs in favour of a "snippet" framework) but in the
* meantime we hope this will handle most practical GLSL and ARBfp
* requirements.
*
* Also remember you need to check for either the
* %COGL_FEATURE_SHADERS_GLSL or %COGL_FEATURE_SHADERS_ARBFP before
* using the cogl_program or cogl_shader API.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_user_program (CoglPipeline *pipeline,
CoglHandle program);
/**
* cogl_pipeline_set_depth_state:
* @pipeline: A #CoglPipeline object
* @state: A #CoglDepthState struct
* @error: A #CoglError to report failures to setup the given @state.
*
* This commits all the depth state configured in @state struct to the
* given @pipeline. The configuration values are copied into the
* pipeline so there is no requirement to keep the #CoglDepthState
* struct around if you don't need it any more.
*
* Note: Since some platforms do not support the depth range feature
* it is possible for this function to fail and report an @error.
*
* Returns: TRUE if the GPU supports all the given @state else %FALSE
* and returns an @error.
*
* Since: 2.0
* Stability: Unstable
*/
CoglBool
cogl_pipeline_set_depth_state (CoglPipeline *pipeline,
const CoglDepthState *state,
CoglError **error);
/**
* cogl_pipeline_get_depth_state
* @pipeline: A #CoglPipeline object
* @state_out: (out): A destination #CoglDepthState struct
*
* Retrieves the current depth state configuration for the given
* @pipeline as previously set using cogl_pipeline_set_depth_state().
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_get_depth_state (CoglPipeline *pipeline,
CoglDepthState *state_out);
/**
* CoglPipelineCullFaceMode:
* @COGL_PIPELINE_CULL_FACE_MODE_NONE: Neither face will be
* culled. This is the default.
* @COGL_PIPELINE_CULL_FACE_MODE_FRONT: Front faces will be culled.
* @COGL_PIPELINE_CULL_FACE_MODE_BACK: Back faces will be culled.
* @COGL_PIPELINE_CULL_FACE_MODE_BOTH: All faces will be culled.
*
* Specifies which faces should be culled. This can be set on a
* pipeline using cogl_pipeline_set_cull_face_mode().
*/
typedef enum
{
COGL_PIPELINE_CULL_FACE_MODE_NONE,
COGL_PIPELINE_CULL_FACE_MODE_FRONT,
COGL_PIPELINE_CULL_FACE_MODE_BACK,
COGL_PIPELINE_CULL_FACE_MODE_BOTH
} CoglPipelineCullFaceMode;
/**
* cogl_pipeline_set_cull_face_mode:
* @pipeline: A #CoglPipeline
* @cull_face_mode: The new mode to set
*
* Sets which faces will be culled when drawing. Face culling can be
* used to increase efficiency by avoiding drawing faces that would
* get overridden. For example, if a model has gaps so that it is
* impossible to see the inside then faces which are facing away from
* the screen will never be seen so there is no point in drawing
* them. This can be acheived by setting the cull face mode to
* %COGL_PIPELINE_CULL_FACE_MODE_BACK.
*
* Face culling relies on the primitives being drawn with a specific
* order to represent which faces are facing inside and outside the
* model. This order can be specified by calling
* cogl_pipeline_set_front_face_winding().
*
* Status: Unstable
* Since: 2.0
*/
void
cogl_pipeline_set_cull_face_mode (CoglPipeline *pipeline,
CoglPipelineCullFaceMode cull_face_mode);
/**
* cogl_pipeline_get_cull_face_mode:
*
* Return value: the cull face mode that was previously set with
* cogl_pipeline_set_cull_face_mode().
*
* Status: Unstable
* Since: 2.0
*/
CoglPipelineCullFaceMode
cogl_pipeline_get_cull_face_mode (CoglPipeline *pipeline);
/**
* cogl_pipeline_set_front_face_winding:
* @pipeline: a #CoglPipeline
* @front_winding: the winding order
*
* The order of the vertices within a primitive specifies whether it
* is considered to be front or back facing. This function specifies
* which order is considered to be the front
* faces. %COGL_WINDING_COUNTER_CLOCKWISE sets the front faces to
* primitives with vertices in a counter-clockwise order and
* %COGL_WINDING_CLOCKWISE sets them to be clockwise. The default is
* %COGL_WINDING_COUNTER_CLOCKWISE.
*
* Status: Unstable
* Since: 2.0
*/
void
cogl_pipeline_set_front_face_winding (CoglPipeline *pipeline,
CoglWinding front_winding);
/**
* cogl_pipeline_get_front_face_winding:
* @pipeline: a #CoglPipeline
*
* The order of the vertices within a primitive specifies whether it
* is considered to be front or back facing. This function specifies
* which order is considered to be the front
* faces. %COGL_WINDING_COUNTER_CLOCKWISE sets the front faces to
* primitives with vertices in a counter-clockwise order and
* %COGL_WINDING_CLOCKWISE sets them to be clockwise. The default is
* %COGL_WINDING_COUNTER_CLOCKWISE.
*
* Returns: The @pipeline front face winding
*
* Status: Unstable
* Since: 2.0
*/
CoglWinding
cogl_pipeline_get_front_face_winding (CoglPipeline *pipeline);
/**
* cogl_pipeline_set_uniform_1f:
* @pipeline: A #CoglPipeline object
* @uniform_location: The uniform's location identifier
* @value: The new value for the uniform
*
* Sets a new value for the uniform at @uniform_location. If this
* pipeline has a user program attached and is later used as a source
* for drawing, the given value will be assigned to the uniform which
* can be accessed from the shader's source. The value for
* @uniform_location should be retrieved from the string name of the
* uniform by calling cogl_pipeline_get_uniform_location().
*
* This function should be used to set uniforms that are of type
* float. It can also be used to set a single member of a float array
* uniform.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_uniform_1f (CoglPipeline *pipeline,
int uniform_location,
float value);
/**
* cogl_pipeline_set_uniform_1i:
* @pipeline: A #CoglPipeline object
* @uniform_location: The uniform's location identifier
* @value: The new value for the uniform
*
* Sets a new value for the uniform at @uniform_location. If this
* pipeline has a user program attached and is later used as a source
* for drawing, the given value will be assigned to the uniform which
* can be accessed from the shader's source. The value for
* @uniform_location should be retrieved from the string name of the
* uniform by calling cogl_pipeline_get_uniform_location().
*
* This function should be used to set uniforms that are of type
* int. It can also be used to set a single member of a int array
* uniform or a sampler uniform.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_uniform_1i (CoglPipeline *pipeline,
int uniform_location,
int value);
/**
* cogl_pipeline_set_uniform_float:
* @pipeline: A #CoglPipeline object
* @uniform_location: The uniform's location identifier
* @n_components: The number of components in the corresponding uniform's type
* @count: The number of values to set
* @value: Pointer to the new values to set
*
* Sets new values for the uniform at @uniform_location. If this
* pipeline has a user program attached and is later used as a source
* for drawing, the given values will be assigned to the uniform which
* can be accessed from the shader's source. The value for
* @uniform_location should be retrieved from the string name of the
* uniform by calling cogl_pipeline_get_uniform_location().
*
* This function can be used to set any floating point type uniform,
* including float arrays and float vectors. For example, to set a
* single vec4 uniform you would use 4 for @n_components and 1 for
* @count. To set an array of 8 float values, you could use 1 for
* @n_components and 8 for @count.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_uniform_float (CoglPipeline *pipeline,
int uniform_location,
int n_components,
int count,
const float *value);
/**
* cogl_pipeline_set_uniform_int:
* @pipeline: A #CoglPipeline object
* @uniform_location: The uniform's location identifier
* @n_components: The number of components in the corresponding uniform's type
* @count: The number of values to set
* @value: Pointer to the new values to set
*
* Sets new values for the uniform at @uniform_location. If this
* pipeline has a user program attached and is later used as a source
* for drawing, the given values will be assigned to the uniform which
* can be accessed from the shader's source. The value for
* @uniform_location should be retrieved from the string name of the
* uniform by calling cogl_pipeline_get_uniform_location().
*
* This function can be used to set any integer type uniform,
* including int arrays and int vectors. For example, to set a single
* ivec4 uniform you would use 4 for @n_components and 1 for
* @count. To set an array of 8 int values, you could use 1 for
* @n_components and 8 for @count.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_uniform_int (CoglPipeline *pipeline,
int uniform_location,
int n_components,
int count,
const int *value);
/**
* cogl_pipeline_set_uniform_matrix:
* @pipeline: A #CoglPipeline object
* @uniform_location: The uniform's location identifier
* @dimensions: The size of the matrix
* @count: The number of values to set
* @transpose: Whether to transpose the matrix
* @value: Pointer to the new values to set
*
* Sets new values for the uniform at @uniform_location. If this
* pipeline has a user program attached and is later used as a source
* for drawing, the given values will be assigned to the uniform which
* can be accessed from the shader's source. The value for
* @uniform_location should be retrieved from the string name of the
* uniform by calling cogl_pipeline_get_uniform_location().
*
* This function can be used to set any matrix type uniform, including
* matrix arrays. For example, to set a single mat4 uniform you would
* use 4 for @dimensions and 1 for @count. To set an array of 8
* mat3 values, you could use 3 for @dimensions and 8 for @count.
*
* If @transpose is %FALSE then the matrix is expected to be in
* column-major order or if it is %TRUE then the matrix is in
* row-major order. You can pass a #CoglMatrix by calling by passing
* the result of cogl_matrix_get_array() in @value and setting
* @transpose to %FALSE.
*
* Since: 2.0
* Stability: Unstable
*/
void
cogl_pipeline_set_uniform_matrix (CoglPipeline *pipeline,
int uniform_location,
int dimensions,
int count,
CoglBool transpose,
const float *value);
/**
* cogl_pipeline_add_snippet:
* @pipeline: A #CoglPipeline
* @snippet: The #CoglSnippet to add to the vertex processing hook
*
* Adds a shader snippet to @pipeline. The snippet will wrap around or
* replace some part of the pipeline as defined by the hook point in
* @snippet. Note that some hook points are specific to a layer and
* must be added with cogl_pipeline_add_layer_snippet() instead.
*
* Since: 1.10
* Stability: Unstable
*/
void
cogl_pipeline_add_snippet (CoglPipeline *pipeline,
CoglSnippet *snippet);
#endif /* COGL_ENABLE_EXPERIMENTAL_API */
COGL_END_DECLS
#endif /* __COGL_PIPELINE_STATE_H__ */
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