[Piglit] [PATCH 05/12] Port texture env test from Glean to Piglit
Note: 3 texture environment functions (modulate, decal and blend) were
introduces with OpenGL 1.0. GL 1.1 and 1.3 added the replace and add
functions, respectively. As this test tests all 5 functions it is classified
as OpenGL 1.3.
---
tests/all.py| 1 +
tests/spec/gl-1.3/CMakeLists.gl.txt | 1 +
tests/spec/gl-1.3/texture-env.c | 528
3 files changed, 530 insertions(+)
create mode 100644 tests/spec/gl-1.3/texture-env.c
diff --git a/tests/all.py b/tests/all.py
index 7754dbe..48b8a51 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -1116,6 +1116,7 @@ with profile.test_list.group_manager(
grouptools.join('spec', '!opengl 1.3')) as g:
g(['texunits'])
g(['tex-border-1'])
+g(['gl-1.3-texture-env'])
g(['tex3d-depth1'])
with profile.test_list.group_manager(
diff --git a/tests/spec/gl-1.3/CMakeLists.gl.txt
b/tests/spec/gl-1.3/CMakeLists.gl.txt
index 607d2c1..8eaa94d 100644
--- a/tests/spec/gl-1.3/CMakeLists.gl.txt
+++ b/tests/spec/gl-1.3/CMakeLists.gl.txt
@@ -9,5 +9,6 @@ link_libraries (
)
piglit_add_executable (gl-1.3-alpha_to_coverage_nop alpha_to_coverage_nop.c)
+piglit_add_executable (gl-1.3-texture-env texture-env.c)
# vim: ft=cmake:
diff --git a/tests/spec/gl-1.3/texture-env.c b/tests/spec/gl-1.3/texture-env.c
new file mode 100644
index 000..cffeadc
--- /dev/null
+++ b/tests/spec/gl-1.3/texture-env.c
@@ -0,0 +1,528 @@
+/*
+ * Copyright (C) 1999 Allen Akin All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+ * KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+ * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL ALLEN AKIN BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/**
+ * @file tex-env.c: Test the basic texture env modes
+ * Author: Brian Paul (bri...@valinux.com) April 2001
+ *
+ * Test procedure:
+ * Setup a texture with 81 columns of unique RGBA colors, 3 texels each.
+ * Draw a 81 uniquely-colored flat-shaded quads as wide horizontal bands,
+ * with the above texture. This makes a matrix of 81*81 colored squares
+ * for which we test that the current texture environment mode and texture
+ * format produced the correct color.
+ * Finally, we blend over a gray background in order to verify that the
+ * post-texture alpha value is correct.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+ config.supports_gl_compat_version = 13;
+ config.window_visual = PIGLIT_GL_VISUAL_RGBA;
+ config.khr_no_error_support = PIGLIT_NO_ERRORS;
+ config.window_width = 256;
+ config.window_height = 256;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+#define BLEND_WITH_BACKGROUND 1
+
+#define COLORS (3 * 3 * 3 * 3)
+
+static float colors[COLORS][4];
+
+static float bg_color[4] = {0.5, 0.5, 0.5, 0.5};
+
+static const GLenum format_enums[] = {
+ GL_ALPHA,
+ GL_LUMINANCE,
+ GL_LUMINANCE_ALPHA,
+ GL_INTENSITY,
+ GL_RGB,
+ GL_RGBA
+};
+
+static const GLenum env_mode_enums[] = {
+ GL_REPLACE,
+ GL_MODULATE,
+ GL_DECAL,
+ GL_BLEND,
+ GL_ADD
+};
+
+/* Compute expected texenv result given the texture env mode, the texture
+ * base format, texture color, fragment color, and texture env color.
+ * This also blends the result with the background color if that option
+ * is enabled (see above). */
+static void
+compute_expected_color(GLenum env_mode, GLenum tex_format,
+ const float tex_color[4], const float frag_color[4],
+ const float env_color[4], float result[4])
+{
+ switch (env_mode) {
+ case GL_REPLACE:
+ switch (tex_format) {
+ case GL_ALPHA:
+ result[0] = frag_color[0];
+ result[1] = frag_color[1];
+ result[2] = frag_color[2];
+ result[3] = tex_color[3]; /* alpha */
+ break;
+ case GL_LUMINANCE:
+ result[0] = tex_color[0]; /* lum */
+ result[1] = tex_color[0];
+
Re: [Piglit] [PATCH 05/12] Port texture env test from Glean to Piglit
On 2017-11-14 23:58, Brian Paul wrote:
> I'm getting a few compiler warnings from this test:
>
> /home/brianp/piglit/tests/spec/gl-1.3/texture-env.c: In function
> ‘piglit_display’:
> /home/brianp/piglit/tests/spec/gl-1.3/texture-env.c:474:17: warning:
> passing argument 4 of ‘matrix_test’ from incompatible pointer type
> COLORS, colors,
> ^
> /home/brianp/piglit/tests/spec/gl-1.3/texture-env.c:384:1: note:
> expected ‘const float (*)[4]’ but argument is of type ‘float (*)[4]’
> matrix_test(GLenum env_mode, GLenum tex_format, int num_colors,
> ^
> /home/brianp/piglit/tests/spec/gl-1.3/texture-env.c:483:8: warning:
> passing argument 4 of ‘matrix_test’ from incompatible pointer type
> colors, colors[0])) {
> ^
> /home/brianp/piglit/tests/spec/gl-1.3/texture-env.c:384:1: note:
> expected ‘const float (*)[4]’ but argument is of type ‘float (*)[4]’
> matrix_test(GLenum env_mode, GLenum tex_format, int num_colors,
> ^
>
> Can you try to fix those?
This revised patch set should silence those warnings.
Sorry for the noisy patch the compilers I previously used didn't warn
about this conversion.
Fabian
___
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Re: [Piglit] [PATCH 05/12] Port texture env test from Glean to Piglit
I'm getting a few compiler warnings from this test:
/home/brianp/piglit/tests/spec/gl-1.3/texture-env.c: In function
‘piglit_display’:
/home/brianp/piglit/tests/spec/gl-1.3/texture-env.c:474:17: warning:
passing argument 4 of ‘matrix_test’ from incompatible pointer type
COLORS, colors,
^
/home/brianp/piglit/tests/spec/gl-1.3/texture-env.c:384:1: note:
expected ‘const float (*)[4]’ but argument is of type ‘float (*)[4]’
matrix_test(GLenum env_mode, GLenum tex_format, int num_colors,
^
/home/brianp/piglit/tests/spec/gl-1.3/texture-env.c:483:8: warning:
passing argument 4 of ‘matrix_test’ from incompatible pointer type
colors, colors[0])) {
^
/home/brianp/piglit/tests/spec/gl-1.3/texture-env.c:384:1: note:
expected ‘const float (*)[4]’ but argument is of type ‘float (*)[4]’
matrix_test(GLenum env_mode, GLenum tex_format, int num_colors,
^
Can you try to fix those?
-Brian
On 11/14/2017 02:47 PM, Fabian Bieler wrote:
Note: 3 texture environment functions (modulate, decal and blend) were
introduces with OpenGL 1.0. GL 1.1 and 1.3 added the replace and add
functions, respectively. As this test tests all 5 functions it is classified
as OpenGL 1.3.
---
tests/all.py| 1 +
tests/spec/gl-1.3/CMakeLists.gl.txt | 1 +
tests/spec/gl-1.3/texture-env.c | 526
3 files changed, 528 insertions(+)
create mode 100644 tests/spec/gl-1.3/texture-env.c
diff --git a/tests/all.py b/tests/all.py
index 7754dbe..48b8a51 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -1116,6 +1116,7 @@ with profile.test_list.group_manager(
grouptools.join('spec', '!opengl 1.3')) as g:
g(['texunits'])
g(['tex-border-1'])
+g(['gl-1.3-texture-env'])
g(['tex3d-depth1'])
with profile.test_list.group_manager(
diff --git a/tests/spec/gl-1.3/CMakeLists.gl.txt
b/tests/spec/gl-1.3/CMakeLists.gl.txt
index 607d2c1..8eaa94d 100644
--- a/tests/spec/gl-1.3/CMakeLists.gl.txt
+++ b/tests/spec/gl-1.3/CMakeLists.gl.txt
@@ -9,5 +9,6 @@ link_libraries (
)
piglit_add_executable (gl-1.3-alpha_to_coverage_nop alpha_to_coverage_nop.c)
+piglit_add_executable (gl-1.3-texture-env texture-env.c)
# vim: ft=cmake:
diff --git a/tests/spec/gl-1.3/texture-env.c b/tests/spec/gl-1.3/texture-env.c
new file mode 100644
index 000..7b43507
--- /dev/null
+++ b/tests/spec/gl-1.3/texture-env.c
@@ -0,0 +1,526 @@
+/*
+ * Copyright (C) 1999 Allen Akin All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+ * KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+ * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL ALLEN AKIN BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/**
+ * @file tex-env.c: Test the basic texture env modes
+ * Author: Brian Paul (bri...@valinux.com) April 2001
+ *
+ * Test procedure:
+ * Setup a texture with 81 columns of unique RGBA colors, 3 texels each.
+ * Draw a 81 uniquely-colored flat-shaded quads as wide horizontal bands,
+ * with the above texture. This makes a matrix of 81*81 colored squares
+ * for which we test that the current texture environment mode and texture
+ * format produced the correct color.
+ * Finally, we blend over a gray background in order to verify that the
+ * post-texture alpha value is correct.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+ config.supports_gl_compat_version = 13;
+ config.window_visual = PIGLIT_GL_VISUAL_RGBA;
+ config.khr_no_error_support = PIGLIT_NO_ERRORS;
+ config.window_width = 256;
+ config.window_height = 256;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+#define BLEND_WITH_BACKGROUND 1
+
+#define COLORS (3 * 3 * 3 * 3)
+
+static float colors[COLORS][4];
+
+static float bg_color[4] = {0.5, 0.5, 0.5, 0.5};
+
+static const GLenum format_enums[] = {
+ GL_ALPHA,
+ GL_LUMINANCE,
+ GL_LUMINANCE_ALPHA,
+ GL_INTENSITY,
+ GL_RGB,
+ GL_RGBA
+};
+
+static const GLenum env_mode_enums[] = {
+ GL_REPLACE,
+ GL_MODULATE,
+ GL_DECAL,
+ GL_BLEND,
+ GL
[Piglit] [PATCH 05/12] Port texture env test from Glean to Piglit
Note: 3 texture environment functions (modulate, decal and blend) were
introduces with OpenGL 1.0. GL 1.1 and 1.3 added the replace and add
functions, respectively. As this test tests all 5 functions it is classified
as OpenGL 1.3.
---
tests/all.py| 1 +
tests/spec/gl-1.3/CMakeLists.gl.txt | 1 +
tests/spec/gl-1.3/texture-env.c | 526
3 files changed, 528 insertions(+)
create mode 100644 tests/spec/gl-1.3/texture-env.c
diff --git a/tests/all.py b/tests/all.py
index 7754dbe..48b8a51 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -1116,6 +1116,7 @@ with profile.test_list.group_manager(
grouptools.join('spec', '!opengl 1.3')) as g:
g(['texunits'])
g(['tex-border-1'])
+g(['gl-1.3-texture-env'])
g(['tex3d-depth1'])
with profile.test_list.group_manager(
diff --git a/tests/spec/gl-1.3/CMakeLists.gl.txt
b/tests/spec/gl-1.3/CMakeLists.gl.txt
index 607d2c1..8eaa94d 100644
--- a/tests/spec/gl-1.3/CMakeLists.gl.txt
+++ b/tests/spec/gl-1.3/CMakeLists.gl.txt
@@ -9,5 +9,6 @@ link_libraries (
)
piglit_add_executable (gl-1.3-alpha_to_coverage_nop alpha_to_coverage_nop.c)
+piglit_add_executable (gl-1.3-texture-env texture-env.c)
# vim: ft=cmake:
diff --git a/tests/spec/gl-1.3/texture-env.c b/tests/spec/gl-1.3/texture-env.c
new file mode 100644
index 000..7b43507
--- /dev/null
+++ b/tests/spec/gl-1.3/texture-env.c
@@ -0,0 +1,526 @@
+/*
+ * Copyright (C) 1999 Allen Akin All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+ * KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+ * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL ALLEN AKIN BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/**
+ * @file tex-env.c: Test the basic texture env modes
+ * Author: Brian Paul (bri...@valinux.com) April 2001
+ *
+ * Test procedure:
+ * Setup a texture with 81 columns of unique RGBA colors, 3 texels each.
+ * Draw a 81 uniquely-colored flat-shaded quads as wide horizontal bands,
+ * with the above texture. This makes a matrix of 81*81 colored squares
+ * for which we test that the current texture environment mode and texture
+ * format produced the correct color.
+ * Finally, we blend over a gray background in order to verify that the
+ * post-texture alpha value is correct.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+ config.supports_gl_compat_version = 13;
+ config.window_visual = PIGLIT_GL_VISUAL_RGBA;
+ config.khr_no_error_support = PIGLIT_NO_ERRORS;
+ config.window_width = 256;
+ config.window_height = 256;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+#define BLEND_WITH_BACKGROUND 1
+
+#define COLORS (3 * 3 * 3 * 3)
+
+static float colors[COLORS][4];
+
+static float bg_color[4] = {0.5, 0.5, 0.5, 0.5};
+
+static const GLenum format_enums[] = {
+ GL_ALPHA,
+ GL_LUMINANCE,
+ GL_LUMINANCE_ALPHA,
+ GL_INTENSITY,
+ GL_RGB,
+ GL_RGBA
+};
+
+static const GLenum env_mode_enums[] = {
+ GL_REPLACE,
+ GL_MODULATE,
+ GL_DECAL,
+ GL_BLEND,
+ GL_ADD
+};
+
+/* Compute expected texenv result given the texture env mode, the texture
+ * base format, texture color, fragment color, and texture env color.
+ * This also blends the result with the background color if that option
+ * is enabled (see above). */
+static void
+compute_expected_color(GLenum env_mode, GLenum tex_format,
+ const float tex_color[4], const float frag_color[4],
+ const float env_color[4], float result[4])
+{
+ switch (env_mode) {
+ case GL_REPLACE:
+ switch (tex_format) {
+ case GL_ALPHA:
+ result[0] = frag_color[0];
+ result[1] = frag_color[1];
+ result[2] = frag_color[2];
+ result[3] = tex_color[3]; /* alpha */
+ break;
+ case GL_LUMINANCE:
+ result[0] = tex_color[0]; /* lum */
+ result[1] = tex_color[0];
+
[Piglit] [PATCH 05/12] Port texture env test from Glean to Piglit
Note: 3 texture environment functions (modulate, decal and blend) were
introduces with OpenGL 1.0. GL 1.1 and 1.3 added the replace and add
functions, respectively. As this test tests all 5 functions it is classified
as OpenGL 1.3.
---
tests/all.py| 1 +
tests/spec/gl-1.3/CMakeLists.gl.txt | 1 +
tests/spec/gl-1.3/texture-env.c | 526
3 files changed, 528 insertions(+)
create mode 100644 tests/spec/gl-1.3/texture-env.c
diff --git a/tests/all.py b/tests/all.py
index 3fd1153..3142ad2 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -1037,6 +1037,7 @@ with profile.test_list.group_manager(
grouptools.join('spec', '!opengl 1.3')) as g:
g(['texunits'])
g(['tex-border-1'])
+g(['gl-1.3-texture-env'])
g(['tex3d-depth1'])
with profile.test_list.group_manager(
diff --git a/tests/spec/gl-1.3/CMakeLists.gl.txt
b/tests/spec/gl-1.3/CMakeLists.gl.txt
index 607d2c1..8eaa94d 100644
--- a/tests/spec/gl-1.3/CMakeLists.gl.txt
+++ b/tests/spec/gl-1.3/CMakeLists.gl.txt
@@ -9,5 +9,6 @@ link_libraries (
)
piglit_add_executable (gl-1.3-alpha_to_coverage_nop alpha_to_coverage_nop.c)
+piglit_add_executable (gl-1.3-texture-env texture-env.c)
# vim: ft=cmake:
diff --git a/tests/spec/gl-1.3/texture-env.c b/tests/spec/gl-1.3/texture-env.c
new file mode 100644
index 000..7b43507
--- /dev/null
+++ b/tests/spec/gl-1.3/texture-env.c
@@ -0,0 +1,526 @@
+/*
+ * Copyright (C) 1999 Allen Akin All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
+ * KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+ * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+ * PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL ALLEN AKIN BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+ * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+/**
+ * @file tex-env.c: Test the basic texture env modes
+ * Author: Brian Paul (bri...@valinux.com) April 2001
+ *
+ * Test procedure:
+ * Setup a texture with 81 columns of unique RGBA colors, 3 texels each.
+ * Draw a 81 uniquely-colored flat-shaded quads as wide horizontal bands,
+ * with the above texture. This makes a matrix of 81*81 colored squares
+ * for which we test that the current texture environment mode and texture
+ * format produced the correct color.
+ * Finally, we blend over a gray background in order to verify that the
+ * post-texture alpha value is correct.
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+
+ config.supports_gl_compat_version = 13;
+ config.window_visual = PIGLIT_GL_VISUAL_RGBA;
+ config.khr_no_error_support = PIGLIT_NO_ERRORS;
+ config.window_width = 256;
+ config.window_height = 256;
+
+PIGLIT_GL_TEST_CONFIG_END
+
+#define BLEND_WITH_BACKGROUND 1
+
+#define COLORS (3 * 3 * 3 * 3)
+
+static float colors[COLORS][4];
+
+static float bg_color[4] = {0.5, 0.5, 0.5, 0.5};
+
+static const GLenum format_enums[] = {
+ GL_ALPHA,
+ GL_LUMINANCE,
+ GL_LUMINANCE_ALPHA,
+ GL_INTENSITY,
+ GL_RGB,
+ GL_RGBA
+};
+
+static const GLenum env_mode_enums[] = {
+ GL_REPLACE,
+ GL_MODULATE,
+ GL_DECAL,
+ GL_BLEND,
+ GL_ADD
+};
+
+/* Compute expected texenv result given the texture env mode, the texture
+ * base format, texture color, fragment color, and texture env color.
+ * This also blends the result with the background color if that option
+ * is enabled (see above). */
+static void
+compute_expected_color(GLenum env_mode, GLenum tex_format,
+ const float tex_color[4], const float frag_color[4],
+ const float env_color[4], float result[4])
+{
+ switch (env_mode) {
+ case GL_REPLACE:
+ switch (tex_format) {
+ case GL_ALPHA:
+ result[0] = frag_color[0];
+ result[1] = frag_color[1];
+ result[2] = frag_color[2];
+ result[3] = tex_color[3]; /* alpha */
+ break;
+ case GL_LUMINANCE:
+ result[0] = tex_color[0]; /* lum */
+ result[1] = tex_color[0];
+
