Add C89 support

Allow compilation from C89 compilers.
2025-08-17 05:03:32 -04:00 · 2024-07-08 09:27:12 -04:00 · 2024-07-08 09:27:12 -04:00 · 9a779bf1a1
commit 9a779bf1a1
parent fb4cb83981
66 changed files with 12202 additions and 0 deletions
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+LIMITATIONS
+===========
+
+Here are listed the functions that TinyGL understands with the known
+limitations. The non mentionned functions are *not* implemented and
+must not be used.
+
+
+************ glEnable / glDisable
+
+- The following flags are handled:
+
+GL_CULL_FACE, GL_LIGHTING, GL_COLOR_MATERIAL, GL_TEXTURE_2D, GL_NORMALIZE,
+GL_LIGHTx, GL_POLYGON_OFFSET_FILL, GL_POLYGON_OFFSET_POINT,
+    GL_POLYGON_OFFSET_LINE
+
+
+    - GL_DEPTH_TEST is accepted, but it is only used for lines. For all
+    other primitives, Z buffer use is assumed.  The DepthMode is
+    hardcoded as GL_LESS (OpenGL default).
+
+    ************ glShadeModel
+
+    OK.
+
+    ************ glCullFace
+
+    OK.
+
+    ************ glPolygonMode
+
+    OK.
+
+    ************ glBegin
+
+    No tests are performed to prevent some functions of being executed
+    between glBegin/glEnd.
+
+    ************ glEnd
+
+    OK.
+
+    ************ glVertex
+
+    Some prototypes are not implemented.
+
+
+    ************ glColor
+
+    Some prototypes are not implemented.
+
+    ************ glNormal
+
+    Some prototypes are not implemented.
+
+    ************ glTexCoord
+
+    - Some prototypes are not implemented.
+
+    - The Matrix transformation is not applied yet.
+
+    ************ glEdgeFlag
+
+    OK. The edge handling has to be tested, although it is not much useful
+    in TinyGL.
+
+    ************ glMatrixMode / glLoadMatrixf / glLoadIdentity / glMultMatrixf /
+    glPushMatrix / glPopMatrix / glRotatef / glTranslatef / glScalef /
+    glFrustum
+
+    - The prototypes with doubles are not implemented.
+
+    ************ glViewport
+
+    GlViewport calls a function pointers to tell glx (or another display
+            system) to resize the Z buffer and the ximage. Made optional in
+    version 0.2.
+
+    ************ glGenLists / glIsList / glNewList / glEndList / glCallList
+
+    OK.
+
+    ************ glClear / glClearColor / glClearDepth
+
+    The whole zbuffer and the colors are cleared in any case. The clear color
+    can be redefined, by *not* the initial z value.
+
+    ************ glRenderMode
+
+    Only the modes GL_RENDER and GL_SELECT are implemented.
+
+    ************ glSelectBuffer / glInitNames / glPushName / glPopName / glLoadName
+
+    OK.
+
+    ************ glGenTextures / glDeleteTextures / glBindTexture
+
+    OK. These functions should be used to get the maximum performance with
+    TinyGL.
+
+    ************ glTexImage2D
+
+    The function accepts only RGB UNSIGNED_BYTES bitmaps. They are
+    internally resized to 256x256 so you'd better use that size. No
+    mipmapping is implemented although it will come if asked. No borders
+    are implemented.
+
+    ************ glTexEnvi
+
+    The only supported mode is GL_DECAL, although others are planned if
+    asked.
+
+
+    ************ glTexParameteri
+
+    The other prototypes are not implemented. Only the follwing mode are
+    implemented:
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+    ************ glPixelStorei
+
+    The pixels are alware byte aligned.
+
+    ************ glMaterialfv / glMaterialf / glColorMaterial
+
+    OK.
+
+
+    ************ glLightfv / glLightf / glLightModeli / glLightModelfv
+
+    OK. The OpenGL lightening is implemented but not optimized.
+
+
+    ************ glFlush
+
+    Ignored.
+
+    ************ glHint
+
+    Ignored.
+
+    ************ glGetIntegerv
+
+    - only GL_VIEWPORT, GL_MAX_MODELVIEW_STACK_DEPTH,
+    GL_MAX_PROJECTION_STACK_DEPTH, GL_MAX_LIGHTS, GL_MAX_TEXTURE_SIZE,
+    GL_MAX_TEXTURE_STACK_DEPTH
+
+    ************ glGetIntegerv
+
+    - only GL_TEXTURE_MATRIX, GL_PROJECTION_MATRIX, GL_MODELVIEW_MATRIX,
+    GL_LINE_WIDTH, GL_LINE_WIDTH_RANGE, GL_POINT_SIZE, GL_POINT_SIZE_RANGE
+
+    ************ glPolygonOffset
+
+    - only API implemented.
+
+    ************ glEnableClientState, glDisableClientState,
+
+    - No support for GL_INDEX_ARRAY_POINTER or GL_EDGE_FLAG_ARRAY_POINTER
+
+    ************ glVertexPointer, glNormalPointer,
+    glColorPointer, glTexureCoordPointer
+
+    - OK
+
+    ------------------------------------------------------------------------------
+
+    TinyGL GLX emulation:
+
+
+    ************ glXQueryExtension
+
+    Returns always True
+
+    ************ glXChooseVisual
+
+    Only 8 bit Pseudocolor or 16 bit Truecolor Visual are accepted. The
+    attribute list is ignored.
+
+    ************ glXCreateContext
+
+    The sharing is not implemented although the code could handle it.
+
+    ************ glXDestroyContext
+
+    OK.
+
+    ************ glXMakeCurrent
+
+    Not all the syntax is supported yet, in particular with the 'NULL' or
+    'None' parameters.
+
+
+    ************ glXSwapBuffers
+
+    OK.
+
+    ************ glXWaitGL / glXWaitX
+
+    Ignored.
+
+
+    See README.BEOS for BeOS limitations.
+
+--- end of LIMITATIONS ---