gallium: add a new cap PIPE_CAP_GLSL_ZERO_INIT

Allows driver to select a zero init mode between the 3 possible values.
Reviewed-by: default avatarMarek Olšák <marek.olsak@amd.com>
Part-of: <!4607>
parent ea289d15
......@@ -345,6 +345,7 @@ u_pipe_screen_get_param_defaults(struct pipe_screen *pscreen,
case PIPE_CAP_SHADER_SAMPLES_IDENTICAL:
case PIPE_CAP_TGSI_ATOMINC_WRAP:
case PIPE_CAP_TGSI_TG4_COMPONENT_IN_SWIZZLE:
case PIPE_CAP_GLSL_ZERO_INIT:
return 0;
case PIPE_CAP_MAX_GS_INVOCATIONS:
......
......@@ -579,6 +579,7 @@ The integer capabilities:
* ``PIPE_CAP_SYSTEM_SVM``: True if all application memory can be shared with the GPU without explicit mapping.
* ``PIPE_CAP_VIEWPORT_MASK``: Whether ``TGSI_SEMANTIC_VIEWPORT_MASK`` and ``TGSI_PROPERTY_LAYER_VIEWPORT_RELATIVE`` are supported (see GL_NV_viewport_array2).
* ``PIPE_CAP_MAP_UNSYNCHRONIZED_THREAD_SAFE``: Whether mapping a buffer as unsynchronized from any thread is safe.
* ``PIPE_CAP_GLSL_ZERO_INIT``: Choose a default zero initialization some glsl variables. If `1`, then all glsl shader variables and gl_FragColor are initialized to zero. If `2`, then shader out variables are not initialized but function out variables are.
.. _pipe_capf:
......
......@@ -164,6 +164,9 @@ static int si_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
case PIPE_CAP_MAP_UNSYNCHRONIZED_THREAD_SAFE:
return 1;
case PIPE_CAP_GLSL_ZERO_INIT:
return 2;
case PIPE_CAP_QUERY_SO_OVERFLOW:
return !sscreen->use_ngg_streamout;
......
......@@ -947,6 +947,7 @@ enum pipe_cap
PIPE_CAP_VIEWPORT_MASK,
PIPE_CAP_ALPHA_TO_COVERAGE_DITHER_CONTROL,
PIPE_CAP_MAP_UNSYNCHRONIZED_THREAD_SAFE,
PIPE_CAP_GLSL_ZERO_INIT,
};
/**
......
......@@ -3868,9 +3868,13 @@ struct gl_constants
GLboolean ForceGLSLAbsSqrt;
/**
* Types of variable to default initialized to zero.
* Types of variable to default initialized to zero. Supported values are:
* - 0: no zero initialization
* - 1: all shader variables and gl_FragColor are initialiazed to 0
* - 2: same as 1, but shader out variables are *not* initialized, while
* function out variables are now initialized.
*/
GLuint GLSLZeroInit;
GLchar GLSLZeroInit;
/**
* Treat integer textures using GL_LINEAR filters as GL_NEAREST.
......
......@@ -1205,6 +1205,8 @@ void st_init_extensions(struct pipe_screen *screen,
if (options->glsl_zero_init) {
consts->GLSLZeroInit = 1;
} else {
consts->GLSLZeroInit = screen->get_param(screen, PIPE_CAP_GLSL_ZERO_INIT);
}
consts->ForceIntegerTexNearest = options->force_integer_tex_nearest;
......
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