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ANGLE_base_vertex_base_instance_shader_builtin.txt
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ANGLE_base_vertex_base_instance_shader_builtin.txt
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Name
ANGLE_base_vertex_base_instance_shader_builtin
Name Strings
GL_ANGLE_base_vertex_base_instance_shader_builtin
Contributors
Shrek Shao, Google Inc.
Contributors to the ANGLE_base_vertex_base_instance specification
Contributors to the ARB_shader_draw_parameters specification
Contact
Shrek Shao (shrekshao 'at' google.com)
Status
Incomplete
Version
Last Modified Date: Nov 19, 2021
Author Revision: 1
Number
OpenGL ES Extension XX
Dependencies
The extension is based on ANGLE_base_vertex_base_instance, all limitations of which
apply to this extension.
Overview
This extension is based on ANGLE_base_vertex_base_instance. It should be enabled
only if ANGLE_base_vertex_base_instance is enabled.
Additional to the functionality exposed by ANGLE_base_vertex_base_instance,
<gl_BaseVertex> and <gl_BaseInstance> builtins are added to the shading language.
For any *BaseVertex* draw call variant, the <baseVertex> of the draw may be
read by the vertex shader as <gl_BaseVertex>. For non *BaseVertex* calls,
the value of <gl_BaseVertex> is 0.
For any *BaseInstance draw call variant, the baseInstance of the draw may
be read by the vertex shader as <gl_BaseInstance>. For non *BaseInstance
calls, the value of <gl_BaseInstance> is 0.
IP Status
No known IP claims.
New Procedures and Functions
None.
New Tokens
None.
Additions to Chapter 10 of the OpenGL ES 3.2 Specification
Section 10.5 Drawing Commands Using Vertex Arrays:
The base index of the instance may be read by a vertex shader as
<gl_BaseInstance>, for the commands
void DrawArraysInstancedBaseInstanceANGLE(
enum mode,
int first,
sizei count,
sizei instanceCount,
uint baseInstance);
and
void MultiDrawArraysInstancedBaseInstanceANGLE(
enum mode,
const int *firsts,
const sizei *counts,
const sizei *instanceCounts,
const uint *baseInstances,
sizei drawcount);
The base index of the vertex may be read by a vertex shader as
<gl_BaseVertex>. This value is also added to the <gl_VertexID>.
The base index of the instance may be read by a vertex shader as
<gl_BaseInstance>. Note that this value is not added to the
<gl_InstanceID>, for the commands
void DrawElementsInstancedBaseVertexBaseInstanceANGLE(
enum mode,
sizei count,
enum type,
const void *indices,
sizei instanceCount,
int baseVertex,
uint baseInstance);
and
void MultiDrawElementsInstancedBaseVertexBaseInstanceANGLE(
enum mode,
const sizei *counts,
enum type,
const void *const *indices,
const sizei *instanceCounts,
const int *baseVertices,
const uint *baseInstances,
sizei drawcount);
Errors
None.
Modifications to the OpenGL ES Shading Language Specification, Version 3.00
Including the following line in a shader controls the
language featured described in this extension:
#extension GL_ANGLE_base_vertex_base_instance_shader_builtin : <behavior>
where <behavior> is as specified in section 3.5.
A new preprocessor #define is added to the OpenGL ES Shading Language:
#define GL_ANGLE_base_vertex_base_instance_shader_builtin 1
Issues
None
Revision History
Rev. Date Author Changes
---- -------- ---------------- --------------------------------------------
1 11/19/21 Shrek Shao First revision.
2 06/21/22 Alexey Knyazev Fixed typos and type usage.