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LibGL: Implement glIsTexture

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Required by Xash3D for the r_showtextures command, where it shows every
allocated texture on screen.

Description of glIsTexture from the spec:
"glIsTexture returns GL_TRUE if texture is currently the name of a
texture. If texture is zero, or is a non-zero value that is not
currently the name of a texture, or if an error occurs, glIsTexture
returns GL_FALSE.

A name returned by glGenTextures, but not yet associated with a texture
by calling glBindTexture, is not the name of a texture."

https://www.khronos.org/registry/OpenGL-Refpages/gl4/html/glIsTexture.xhtml
This commit is contained in:
Luke Wilde 2022-01-13 06:02:33 +00:00 committed by Andreas Kling
parent adfb0846d2
commit 1fc611877f
Notes: sideshowbarker 2024-07-17 21:00:07 +09:00 
Author: https://github.com/Lubrsi
Commit: https://github.com/SerenityOS/serenity/commit/1fc611877f0
Pull-request: https://github.com/SerenityOS/serenity/pull/11855
Reviewed-by: https://github.com/Quaker762 ✅
5 changed files with 22 additions and 0 deletions
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1
Userland/Libraries/LibGL/GL/gl.h
View file

@ -552,6 +552,7 @@ GLAPI void glTexParameterf(GLenum target, GLenum pname, GLfloat param);
GLAPI void glTexEnvf(GLenum target, GLenum pname, GLfloat param);
GLAPI void glTexEnvi(GLenum target, GLenum pname, GLint param);
GLAPI void glBindTexture(GLenum target, GLuint texture);
GLAPI GLboolean glIsTexture(GLuint texture);
GLAPI void glActiveTexture(GLenum texture);
GLAPI void glGetBooleanv(GLenum pname, GLboolean* data);
GLAPI void glGetDoublev(GLenum pname, GLdouble* params);

1
Userland/Libraries/LibGL/GLContext.h
View file

@ -71,6 +71,7 @@ public:
virtual void gl_tex_coord(GLfloat s, GLfloat t, GLfloat r, GLfloat q) = 0;
virtual void gl_tex_env(GLenum target, GLenum pname, GLfloat param) = 0;
virtual void gl_bind_texture(GLenum target, GLuint texture) = 0;
virtual GLboolean gl_is_texture(GLuint texture) = 0;
virtual void gl_active_texture(GLenum texture) = 0;
virtual void gl_depth_mask(GLboolean flag) = 0;
virtual void gl_enable_client_state(GLenum cap) = 0;

5
Userland/Libraries/LibGL/GLTexture.cpp
View file

@ -47,6 +47,11 @@ void glBindTexture(GLenum target, GLuint texture)
g_gl_context->gl_bind_texture(target, texture);
}
GLboolean glIsTexture(GLuint texture)
{
return g_gl_context->gl_is_texture(texture);
}
// Note: This is an _extremely_ misleading API name. This sets the active
// texture unit, NOT the active texture itself...
void glActiveTexture(GLenum texture)

14
Userland/Libraries/LibGL/SoftwareGLContext.cpp
View file

@ -1801,6 +1801,20 @@ void SoftwareGLContext::gl_bind_texture(GLenum target, GLuint texture)
m_sampler_config_is_dirty = true;
}
GLboolean SoftwareGLContext::gl_is_texture(GLuint texture)
{
RETURN_VALUE_WITH_ERROR_IF(m_in_draw_state, GL_INVALID_OPERATION, GL_FALSE);
if (texture == 0)
return GL_FALSE;
auto it = m_allocated_textures.find(texture);
if (it == m_allocated_textures.end())
return GL_FALSE;
return it->value.is_null() ? GL_FALSE : GL_TRUE;
}
void SoftwareGLContext::gl_active_texture(GLenum texture)
{
RETURN_WITH_ERROR_IF(texture < GL_TEXTURE0 || texture > GL_TEXTURE31, GL_INVALID_ENUM);

1
Userland/Libraries/LibGL/SoftwareGLContext.h
View file

@ -102,6 +102,7 @@ public:
virtual void gl_tex_coord(GLfloat s, GLfloat t, GLfloat r, GLfloat q) override;
virtual void gl_tex_env(GLenum target, GLenum pname, GLfloat param) override;
virtual void gl_bind_texture(GLenum target, GLuint texture) override;
virtual GLboolean gl_is_texture(GLuint texture) override;
virtual void gl_active_texture(GLenum texture) override;
virtual void gl_depth_mask(GLboolean flag) override;
virtual void gl_enable_client_state(GLenum cap) override;