[Mesa-dev] [PATCH 14/41] main: Added entry point for BindTextureUnit.
Anuj Phogat
anuj.phogat at gmail.com
Tue Dec 30 15:46:16 PST 2014
On Tue, Dec 16, 2014 at 7:46 AM, Brian Paul <brianp at vmware.com> wrote:
> On 12/15/2014 06:22 PM, Laura Ekstrand wrote:
>>
>> The following preparations were made in texstate.c and texstate.h to
>> better facilitate the BindTextureUnit function:
>>
>> Dylan Noblesmith:
>> mesa: add _mesa_get_tex_unit()
>> mesa: factor out _mesa_max_tex_unit()
>> This is about to appear in a lot more places, so
>> reduce boilerplate copy paste.
>> add _mesa_get_tex_unit_err() checking getter function
>> Reduce boilerplate across files.
>>
>> Laura Ekstrand:
>> Made note of why BindTextureUnit should throw GL_INVALID_OPERATION if the
>> unit is out of range.
>> Added assert(unit > 0) to _mesa_get_tex_unit.
>> ---
>> src/mapi/glapi/gen/ARB_direct_state_access.xml | 5 ++
>> src/mesa/main/texobj.c | 108
>> ++++++++++++++++++++++++-
>> src/mesa/main/texobj.h | 15 +++-
>> src/mesa/main/texstate.c | 4 +-
>> src/mesa/main/texstate.h | 39 ++++++++-
>> 5 files changed, 160 insertions(+), 11 deletions(-)
>>
>> diff --git a/src/mapi/glapi/gen/ARB_direct_state_access.xml
>> b/src/mapi/glapi/gen/ARB_direct_state_access.xml
>> index 4c5005f..f54c3f8 100644
>> --- a/src/mapi/glapi/gen/ARB_direct_state_access.xml
>> +++ b/src/mapi/glapi/gen/ARB_direct_state_access.xml
>> @@ -75,5 +75,10 @@
>> <param name="pixels" type="const GLvoid *" />
>> </function>
>>
>> + <function name="BindTextureUnit" offset="assign">
>> + <param name="unit" type="GLuint" />
>> + <param name="texture" type="GLuint" />
>> + </function>
>> +
>> </category>
>> </OpenGLAPI>
>> diff --git a/src/mesa/main/texobj.c b/src/mesa/main/texobj.c
>> index 26d07ee..eb16f47 100644
>> --- a/src/mesa/main/texobj.c
>> +++ b/src/mesa/main/texobj.c
>> @@ -482,8 +482,8 @@ valid_texture_object(const struct gl_texture_object
>> *tex)
>> * when there's a real pointer change.
>> */
>> void
>> -_mesa_reference_texobj_(struct gl_texture_object **ptr,
>> - struct gl_texture_object *tex)
>> +_mesa_reference_texobj_( struct gl_texture_object **ptr,
>> + struct gl_texture_object *tex )
>
>
> I prefer the lack of whitespace as it was.
This extra space is used at many other places in this patch.
>
>
>> {
>> assert(ptr);
>>
>> @@ -503,6 +503,8 @@ _mesa_reference_texobj_(struct gl_texture_object
>> **ptr,
>> mtx_unlock(&oldTex->Mutex);
>>
>> if (deleteFlag) {
>> + /* Passing in the context drastically changes the driver code
>> for
>> + * framebuffer deletion. */
>
>
> Closing */ on next line.
>
>
>> GET_CURRENT_CONTEXT(ctx);
>> if (ctx)
>> ctx->Driver.DeleteTexture(ctx, oldTex);
>> @@ -1571,6 +1573,108 @@ _mesa_BindTexture( GLenum target, GLuint texName )
>> ctx->Driver.BindTexture(ctx, ctx->Texture.CurrentUnit, target,
>> newTexObj);
>> }
>>
>> +/** Do the actual binding to a numbered texture unit.
>
>
> /**
> * Do the ...
>
>
>> + * The refcount on the previously bound
>> + * texture object will be decremented. It'll be deleted if the
>> + * count hits zero.
>> + */
>> +void
>> +_mesa_bind_texture_unit( struct gl_context *ctx,
>> + GLuint unit,
>> + struct gl_texture_object *texObj )
>> +{
>> + struct gl_texture_unit *texUnit;
>> +
>> + /* Get the texture unit (this is an array look-up) */
>> + texUnit = _mesa_get_tex_unit_err(ctx, unit, "glBindTextureUnit");
>> + if (!texUnit)
>> + return;
>> +
>> + /* Check if this texture is only used by this context and is already
>> bound.
>> + * If so, just return.
>> + */
>> + {
>> + GLboolean early_out;
>
>
> bool
>
>
>> + mtx_lock(&ctx->Shared->Mutex);
>> + early_out = ((ctx->Shared->RefCount == 1)
>> + && (texObj ==
>> texUnit->CurrentTex[texObj->TargetIndex]));
>> + mtx_unlock(&ctx->Shared->Mutex);
>> + if (early_out) {
>> + return;
>> + }
>> + }
>> +
>> + /* flush before changing binding */
>> + FLUSH_VERTICES(ctx, _NEW_TEXTURE);
>> +
>> + _mesa_reference_texobj(&texUnit->CurrentTex[texObj->TargetIndex],
>> + texObj);
>> + ASSERT(texUnit->CurrentTex[texObj->TargetIndex]);
>> + ctx->Texture.NumCurrentTexUsed = MAX2(ctx->Texture.NumCurrentTexUsed,
>> + unit + 1);
>> + texUnit->_BoundTextures |= (1 << texObj->TargetIndex);
>> +
>> +
>> + /* Pass BindTexture call to device driver */
>> + if (ctx->Driver.BindTexture)
>> + {
>
>
> Opening { on the if line.
>
>
>
>> + ctx->Driver.BindTexture(ctx, unit, texObj->Target, texObj);
>> + }
>> +}
>> +
>> +/**
>> + * Bind a named texture to the specified texture unit.
>> + *
>> + * \param unit texture unit.
>> + * \param texture texture name.
>> + *
>> + * \sa glBindTexture().
>> + *
>> + * If the named texture is 0, this will reset each target for the
>> specified
>> + * texture unit to its default texture.
>> + * If the named texture is not 0 or a recognized texture name, this
>> throws
>> + * GL_INVALID_OPERATION.
>> + */
>> +void GLAPIENTRY
>> +_mesa_BindTextureUnit( GLuint unit, GLuint texture )
>> +{
>> + GET_CURRENT_CONTEXT(ctx);
>> + struct gl_texture_object *texObj;
>> +
>> + if (MESA_VERBOSE & (VERBOSE_API|VERBOSE_TEXTURE))
>> + _mesa_debug(ctx, "glBindTextureUnit %s %d\n",
>> + _mesa_lookup_enum_by_nr(GL_TEXTURE0+unit), (GLint)
>> texture);
>> +
>> + /* Section 8.1 (Texture Objects) of the OpenGL 4.5 core profile spec
>> + * (20141030) says:
>> + * "When texture is zero, each of the targets enumerated at the
>> + * beginning of this section is reset to its default texture for
>> the
>> + * corresponding texture image unit."
>> + */
>> + if (texture == 0) {
>> + unbind_textures_from_unit(ctx, unit);
>> + return;
>> + }
>> +
>> + /* Get the non-default texture object */
>> + texObj = _mesa_lookup_texture(ctx, texture);
>> +
>> + /* Error checking */
>> + if (!texObj) {
>> + _mesa_error(ctx, GL_INVALID_OPERATION,
>> + "glBindTextureUnit(non-gen name)");
>> + return;
>> + }
>> + if (texObj->Target == 0) {
>> + _mesa_error(ctx, GL_INVALID_ENUM, "glBindTextureUnit(target)");
>> + return;
>> + }
>> + assert(valid_texture_object(texObj));
>> +
>> + _mesa_bind_texture_unit(ctx, unit, texObj);
>> +}
>> +
>> +
>> void GLAPIENTRY
>> _mesa_BindTextures(GLuint first, GLsizei count, const GLuint *textures)
>> {
>> diff --git a/src/mesa/main/texobj.h b/src/mesa/main/texobj.h
>> index b957ac5..34daebb 100644
>> --- a/src/mesa/main/texobj.h
>> +++ b/src/mesa/main/texobj.h
>> @@ -85,12 +85,12 @@ _mesa_clear_texture_object(struct gl_context *ctx,
>> struct gl_texture_object *obj);
>>
>> extern void
>> -_mesa_reference_texobj_(struct gl_texture_object **ptr,
>> - struct gl_texture_object *tex);
>> +_mesa_reference_texobj_( struct gl_texture_object **ptr,
>> + struct gl_texture_object *tex );
>>
>> static inline void
>> -_mesa_reference_texobj(struct gl_texture_object **ptr,
>> - struct gl_texture_object *tex)
>> +_mesa_reference_texobj( struct gl_texture_object **ptr,
>> + struct gl_texture_object *tex )
>> {
>> if (*ptr != tex)
>> _mesa_reference_texobj_(ptr, tex);
>> @@ -190,6 +190,11 @@ _mesa_unlock_context_textures( struct gl_context *ctx
>> );
>> extern void
>> _mesa_lock_context_textures( struct gl_context *ctx );
>>
>> +extern void
>> +_mesa_bind_texture_unit( struct gl_context *ctx,
>> + GLuint unit,
>> + struct gl_texture_object *texObj );
>> +
>> /*@}*/
>>
>> /**
>> @@ -210,6 +215,8 @@ _mesa_DeleteTextures( GLsizei n, const GLuint
>> *textures );
>> extern void GLAPIENTRY
>> _mesa_BindTexture( GLenum target, GLuint texture );
>>
>> +extern void GLAPIENTRY
>> +_mesa_BindTextureUnit( GLuint unit, GLuint texture );
>>
>> extern void GLAPIENTRY
>> _mesa_BindTextures( GLuint first, GLsizei count, const GLuint *textures
>> );
>> diff --git a/src/mesa/main/texstate.c b/src/mesa/main/texstate.c
>> index 36eefa6..66fd718 100644
>> --- a/src/mesa/main/texstate.c
>> +++ b/src/mesa/main/texstate.c
>> @@ -290,9 +290,7 @@ _mesa_ActiveTexture(GLenum texture)
>> GLuint k;
>> GET_CURRENT_CONTEXT(ctx);
>>
>> - /* See OpenGL spec for glActiveTexture: */
>> - k = MAX2(ctx->Const.MaxCombinedTextureImageUnits,
>> - ctx->Const.MaxTextureCoordUnits);
>> + k = _mesa_max_tex_unit(ctx);
>>
>> ASSERT(k <= Elements(ctx->Texture.Unit));
>>
>> diff --git a/src/mesa/main/texstate.h b/src/mesa/main/texstate.h
>> index 5cd1684..2514d10 100644
>> --- a/src/mesa/main/texstate.h
>> +++ b/src/mesa/main/texstate.h
>> @@ -33,9 +33,19 @@
>>
>>
>> #include "compiler.h"
>> +#include "enums.h"
>> +#include "macros.h"
>> #include "mtypes.h"
>>
>>
>> +static inline struct gl_texture_unit *
>> +_mesa_get_tex_unit(struct gl_context *ctx, GLuint unit)
>> +{
>> + ASSERT(unit >= 0);
>> + ASSERT(unit < Elements(ctx->Texture.Unit));
>> + return &(ctx->Texture.Unit[unit]);
>> +}
>> +
>> /**
>> * Return pointer to current texture unit.
>> * This the texture unit set by glActiveTexture(), not
>> glClientActiveTexture().
>> @@ -43,8 +53,33 @@
>> static inline struct gl_texture_unit *
>> _mesa_get_current_tex_unit(struct gl_context *ctx)
>> {
>> - ASSERT(ctx->Texture.CurrentUnit < Elements(ctx->Texture.Unit));
>> - return &(ctx->Texture.Unit[ctx->Texture.CurrentUnit]);
>> + return _mesa_get_tex_unit(ctx, ctx->Texture.CurrentUnit);
>> +}
>> +
>> +static inline GLuint
>> +_mesa_max_tex_unit(struct gl_context *ctx)
>> +{
>> + /* See OpenGL spec for glActiveTexture: */
>> + return MAX2(ctx->Const.MaxCombinedTextureImageUnits,
>> + ctx->Const.MaxTextureCoordUnits);
>> +}
>> +
>> +static inline struct gl_texture_unit *
>> +_mesa_get_tex_unit_err(struct gl_context *ctx, GLuint unit, const char
>> *func)
>> +{
>> + if (unit < _mesa_max_tex_unit(ctx))
>> + return _mesa_get_tex_unit(ctx, unit);
>> +
>> + /* Note: This error is a precedent set by glBindTextures. From the GL
>> 4.5
>> + * specification (30.10.2014) Section 8.1 ("Texture Objects"):
>> + *
>> + * "An INVALID_OPERATION error is generated if first + count is
>> greater
>> + * than the number of texture image units supported by the
>> + * implementation."
>> + */
>> + _mesa_error(ctx, GL_INVALID_OPERATION, "%s(unit=%s)", func,
>> + _mesa_lookup_enum_by_nr(GL_TEXTURE0+unit));
>> + return NULL;
>> }
>>
>>
>>
>
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