tests/spec/ext_texture_integer/api-drawpixels.c

   1 /*
   2  * Copyright (c) 2010 VMware, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NON-INFRINGEMENT.  IN NO EVENT SHALL VMWARE AND/OR THEIR SUPPLIERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 /**
  26  * @file api-teximage.c
  27  *
  28  * Tests GL_EXT_texture_integer's error behavior with glTexImage2D().
  29  *
  30  * The GL_EXT_texture_integer spec doesn't specify how glDrawPixels
  31  * with an integer format is supposed to work.  glDrawPixels generally
  32  * generates fragments for a fragment shader with the gl_Color from
  33  * the immediate data in the DrawPixels call.  However, with
  34  * GL_EXT_texture_integer formats, the immediate data is now integer
  35  * despite gl_Color being a floating-point vec4, and the spec for
  36  * other cases of possible integer-versus-float conflicts resolves
  37  * that the results are undefined.  It doesn't specify any particular
  38  * conversion specific to drawpixels.
  39  *
  40  * In particular, in order for glDrawPixels of integer to be actually
  41  * useful to a user, it needs to put integer values into the fragment
  42  * shader without conversion, and there's no defined way to map the
  43  * DrawPixels input to some user-defined (integer) fragment shader
  44  * input.
  45  *
  46  * The GL 3.0 specification adds the following additional text in
  47  * section 3.7.4 ("Rasterization of Pixel Rectangles) on page 151 of
  48  * the GL 3.0 specification:
  49  *
  50  *     "If format contains integer components, as shown in
  51  *      table 3.6, an INVALID OPERATION error is generated."
  52  *
  53  * The NVIDIA driver, which exposes both 3.0 and
  54  * GL_EXT_texture_integer, follows this behavior.  Resolve that this
  55  * behavior is a correction to the GL_EXT_texture_integer
  56  * specification and check that impleentations follow that.
  57  */
  58
  59 #include "piglit-util-gl.h"
  60
  61 PIGLIT_GL_TEST_CONFIG_BEGIN
  62
  63         config.supports_gl_compat_version = 10;
  64         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  65         config.khr_no_error_support = PIGLIT_HAS_ERRORS;
  66
  67 PIGLIT_GL_TEST_CONFIG_END
  68
  69 enum piglit_result
  70 piglit_display(void)
  71 {
  72         static const int black[4] = {0, 0, 0, 0};
  73         static const float green[4] = {0, 1, 0, 0};
  74         bool pass = GL_TRUE;
  75
  76         /* We don't have to do an integer FBO for this test, because
  77          * no error is specified in the non-integer FBO case:
  78          *
  79          *     "Results of rasterization are undefined if any of the
  80          *      selected draw buffers of the draw framebuffer have an
  81          *      integer format and no fragment shader is active.  "
  82          */
  83         glClearColor(0.0, 1.0, 0.0, 0.0);
  84         glClear(GL_COLOR_BUFFER_BIT);
  85
  86         glDrawPixels(1, 1, GL_RGBA_INTEGER_EXT, GL_UNSIGNED_INT, black);
  87         pass = piglit_check_gl_error(GL_INVALID_OPERATION) && pass;
  88
  89         /* The text in GL 3.0 specification banning
  90          * glDrawPixels(integer format) precedes the restriction from
  91          * GL_EXT_texture_integer which is still included in that
  92          * section:
  93          *
  94          *     "If format is one of the integer component formats as
  95          *      defined in table 3.6 and type is FLOAT, the error
  96          *      INVALID ENUM occurs."
  97          *
  98          * Based on this, we test for GL_INVALID_OPERATION even for FLOAT.
  99          */
 100         glDrawPixels(1, 1, GL_RGBA_INTEGER_EXT, GL_FLOAT, black);
 101         pass = piglit_check_gl_error(GL_INVALID_OPERATION) && pass;
 102
 103         /* Make sure that we really didn't render anything. */
 104         pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green) && pass;
 105
 106         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 107 }
 108
 109 void
 110 piglit_init(int argc, char **argv)
 111 {
 112         piglit_require_extension("GL_EXT_texture_integer");
 113 }