[Piglit] [PATCH 1/4] Add new classes to draw points and lines in to multisample FBO
Paul Berry
stereotype441 at gmail.com
Tue May 22 09:15:37 PDT 2012
On 18 May 2012 16:54, Anuj Phogat <anuj.phogat at gmail.com> wrote:
> This patch adds following new classes to common.cpp file:
> - Points: Draws a sequence of points with varied sizes in
> color buffer.
>
> - Spiral: Draws points with varied sizes in spiral pattern.
>
> - StencilSpiral: Draws spiral pattern in stencil buffer.
>
> - DepthSpiral: Draws spiral pattern in depth buffer.
>
> - Lines: Draws a sequence of lines with varied width in
> color buffer
>
> - Star: Draws lines in a star like pattern.
>
> - StencilStar: Draws star pattern in stencil buffer.
>
> - DepthStar: Draws star pattern in depth buffer.
>
> All above mentioned classes are used to verify drawing multisample
> points and lines in color, depth and sencil buffers.
>
Given my comments in the patches that follow, I think we only need to test
lines and points with respect to the color buffer. So if I'm not mistaken,
we can drop everything but Lines and Points, unless you need them for some
other test you haven't sent out for review yet.
>
> Signed-off-by: Anuj Phogat <anuj.phogat at gmail.com>
> ---
> tests/spec/ext_framebuffer_multisample/common.cpp | 446
> +++++++++++++++++++++
> tests/spec/ext_framebuffer_multisample/common.h | 152 +++++++
> 2 files changed, 598 insertions(+), 0 deletions(-)
>
> diff --git a/tests/spec/ext_framebuffer_multisample/common.cpp
> b/tests/spec/ext_framebuffer_multisample/common.cpp
> index d1e6bcd..33b2859 100644
> --- a/tests/spec/ext_framebuffer_multisample/common.cpp
> +++ b/tests/spec/ext_framebuffer_multisample/common.cpp
> @@ -639,6 +639,452 @@ void Triangles::draw(float (*proj)[4])
> }
> }
>
> +void Lines::compile()
> +{
> + /* Line coords within (-1,-1) to (1,1) rect */
> + static const float pos_line[][2] = {
> + { -0.8, -0.5 },
> + { 0.8, -0.5 }
> + };
> +
> + /* Number of line instances across (and down) */
> + int lines_across = 4;
> +
> + /* Total number of lines drawn */
> + num_lines = lines_across * lines_across;
> +
> + /* Amount each line should be rotated compared to prev */
> + float rotation_delta = M_PI * 2.0 / num_lines;
> +
> + /* Scaling factor uniformly applied to line coords */
> + float line_scale = 0.8 / lines_across;
> +
> + /* Final scaling factor */
> + float final_scale = 0.95;
> +
> + static const char *vert =
> + "#version 130\n"
> + "in vec2 pos_line;\n"
> + "uniform float line_scale;\n"
> + "uniform float rotation_delta;\n"
> + "uniform int lines_across;\n"
> + "uniform float final_scale;\n"
> + "uniform mat4 proj;\n"
> + "uniform int line_num;\n"
> + "\n"
> + "void main()\n"
> + "{\n"
> + " vec2 pos = line_scale * pos_line;\n"
> + " float rotation = rotation_delta * line_num;\n"
> + " pos = mat2(cos(rotation), sin(rotation),\n"
> + " -sin(rotation), cos(rotation)) * pos;\n"
> + " int i = line_num % lines_across;\n"
> + " int j = lines_across - 1 - line_num / lines_across;\n"
> + " pos += (vec2(i, j) * 2.0 + 1.0) / lines_across - 1.0;\n"
> + " pos *= final_scale;\n"
> + " gl_Position = proj * vec4(pos, 0.0, 1.0);\n"
> + "}\n";
> +
> + static const char *frag =
> + "#version 130\n"
> + "void main()\n"
> + "{\n"
> + " gl_FragColor = vec4(1.0);\n"
> + "}\n";
> +
> + /* Compile program */
> + prog = glCreateProgram();
> + GLint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
> + glAttachShader(prog, vs);
> + GLint fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag);
> + glAttachShader(prog, fs);
> + glBindAttribLocation(prog, 0, "pos_line");
> + glLinkProgram(prog);
> + if (!piglit_link_check_status(prog)) {
> + piglit_report_result(PIGLIT_FAIL);
> + }
> +
> + /* Set up uniforms */
> + glUseProgram(prog);
> + glUniform1f(glGetUniformLocation(prog, "line_scale"), line_scale);
> + glUniform1f(glGetUniformLocation(prog, "rotation_delta"),
> + rotation_delta);
> + glUniform1i(glGetUniformLocation(prog, "lines_across"),
> lines_across);
> + glUniform1f(glGetUniformLocation(prog, "final_scale"),
> final_scale);
> + proj_loc = glGetUniformLocation(prog, "proj");
> + line_num_loc = glGetUniformLocation(prog, "line_num");
> +
> + /* Set up vertex array object */
> + glGenVertexArrays(1, &vao);
> + glBindVertexArray(vao);
> +
> + /* Set up vertex input buffer */
> + glGenBuffers(1, &vertex_buf);
> + glBindBuffer(GL_ARRAY_BUFFER, vertex_buf);
> + glBufferData(GL_ARRAY_BUFFER, sizeof(pos_line), pos_line,
> + GL_STATIC_DRAW);
> + glEnableVertexAttribArray(0);
> + glVertexAttribPointer(0, ARRAY_SIZE(pos_line[0]), GL_FLOAT,
> + GL_FALSE, sizeof(pos_line[0]), (void *) 0);
> +}
> +
> +void Lines::draw(float (*proj)[4])
> +{
> + glClear(GL_COLOR_BUFFER_BIT);
> + glUseProgram(prog);
> + glUniformMatrix4fv(proj_loc, 1, GL_TRUE, &proj[0][0]);
> + glBindVertexArray(vao);
> + for (int line_num = 0; line_num < num_lines; ++line_num) {
> + glLineWidth(1 + line_num / 4);
>
It looks like you're trying to set the line width to values 1.0, 1.25, 1.5,
1.75, 2.0, and so on. But because line_num is an integer, what's actually
happening is that the line width is being set to 1, 1, 1, 1, 2, 2, 2, 2, 3,
3, etc.
Did you perhaps mean to do this instead?
glLineWidth(1 + float(line_num) / 4);
It might also be worth testing line widths less than 1.0, e.g.
glLineWidth(float(1 + line_num) / 4);
> + glUniform1i(line_num_loc, line_num);
> + glDrawArrays(GL_LINES, 0, 2);
> + }
> +}
> +
> +void Points::compile()
> +{
> + /* Point coords within (-1,-1) to (1,1) rect */
> + static const float pos_point[2] = { -0.5, -0.5 };
> +
> + /* Number of point instances across (and down) */
> + int points_across = 4;
> +
> + /* Total number of points drawn */
> + num_points = points_across * points_across;
> +
> + /* Scaling factor uniformly applied to point coords */
> + float point_scale = 0.8 / points_across;
> +
> + /* Final scaling factor */
> + float final_scale = 0.95;
> +
> + static const char *vert =
> + "#version 130\n"
> + "in vec2 pos_point;\n"
> + "uniform float point_scale;\n"
> + "uniform int points_across;\n"
> + "uniform float final_scale;\n"
> + "uniform mat4 proj;\n"
> + "uniform int point_num;\n"
> + "uniform float depth;\n"
> + "\n"
> + "void main()\n"
> + "{\n"
> + " vec2 pos = point_scale * pos_point;\n"
> + " int i = point_num % points_across;\n"
> + " int j = points_across - 1 - point_num /
> points_across;\n"
> + " pos += (vec2(i, j) * 2.0 + 1.0) / points_across -
> 1.0;\n"
> + " pos *= final_scale;\n"
> + " gl_Position = proj * vec4(pos, depth, 1.0);\n"
> + "}\n";
> +
> + static const char *frag =
> + "#version 130\n"
> + "void main()\n"
> + "{\n"
> + " gl_FragColor = vec4(1.0);\n"
> + "}\n";
> +
> + /* Compile program */
> + prog = glCreateProgram();
> + GLint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
> + glAttachShader(prog, vs);
> + GLint fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag);
> + glAttachShader(prog, fs);
> + glBindAttribLocation(prog, 0, "pos_point");
> + glLinkProgram(prog);
> + if (!piglit_link_check_status(prog)) {
> + piglit_report_result(PIGLIT_FAIL);
> + }
> +
> + /* Set up uniforms */
> + glUseProgram(prog);
> + glUniform1f(glGetUniformLocation(prog, "point_scale"),
> point_scale);
> + glUniform1i(glGetUniformLocation(prog, "points_across"),
> points_across);
> + glUniform1f(glGetUniformLocation(prog, "final_scale"),
> final_scale);
> + proj_loc = glGetUniformLocation(prog, "proj");
> + point_num_loc = glGetUniformLocation(prog, "point_num");
> + depth_loc = glGetUniformLocation(prog, "depth");
> +
> + /* Set up vertex array object */
> + glGenVertexArrays(1, &vao);
> + glBindVertexArray(vao);
> +
> + /* Set up vertex input buffer */
> + glGenBuffers(1, &vertex_buf);
> + glBindBuffer(GL_ARRAY_BUFFER, vertex_buf);
> + glBufferData(GL_ARRAY_BUFFER, sizeof(pos_point), pos_point,
> + GL_STATIC_DRAW);
> + glEnableVertexAttribArray(0);
> + glVertexAttribPointer(0, ARRAY_SIZE(pos_point), GL_FLOAT,
> + GL_FALSE, 0, (void *) 0);
> +}
> +
> +void Points::draw(float (*proj)[4])
> +{
> + glClear(GL_COLOR_BUFFER_BIT);
> + glUseProgram(prog);
> + glUniformMatrix4fv(proj_loc, 1, GL_TRUE, &proj[0][0]);
> + glBindVertexArray(vao);
> + glUniform1f(depth_loc, 0.0);
> + for (int point_num = 0; point_num < num_points; ++point_num) {
> + glPointSize(2 + point_num);
>
Any particular reason why we're only testing integer point sizes >= 2?
> + glUniform1i(point_num_loc, point_num);
> + glDrawArrays(GL_POINTS, 0, 1);
> + }
> +}
> +
> +void Spiral::compile()
> +{
> + /* Point coords within (-1,-1) to (1,1) rect */
> + static const float pos_point[2] = { 0.7, 0.7 };
> +
> + num_points = 15;
> + num_circles = 3;
> +
> + static const char *vert =
> + "#version 130\n"
> + "in vec2 pos_point;\n"
> + "uniform float rotation;\n"
> + "uniform float length;\n"
> + "uniform float depth;\n"
> + "uniform mat4 proj;\n"
> + "\n"
> + "void main()\n"
> + "{\n"
> + " vec2 pos = pos_point * length;\n"
> + " pos = mat2(cos(rotation), sin(rotation),\n"
> + " -sin(rotation), cos(rotation)) * pos;\n"
> + " gl_Position = proj * vec4(pos, depth, 1.0);\n"
> + "}\n";
> +
> + static const char *frag =
> + "#version 130\n"
> + "void main()\n"
> + "{\n"
> + " gl_FragColor = vec4(0.0);\n"
> + "}\n";
> +
> + /* Compile program */
> + prog = glCreateProgram();
> + GLint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
> + glAttachShader(prog, vs);
> + GLint fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag);
> + glAttachShader(prog, fs);
> + glBindAttribLocation(prog, 0, "pos_point");
> + glLinkProgram(prog);
> + if (!piglit_link_check_status(prog)) {
> + piglit_report_result(PIGLIT_FAIL);
> + }
> +
> + /* Set up uniforms */
> + glUseProgram(prog);
> + rotation_loc = glGetUniformLocation(prog, "rotation");
> + length_loc = glGetUniformLocation(prog, "length");
> + depth_loc = glGetUniformLocation(prog, "depth");
> + glUniform1f(depth_loc, 0.0);
> + proj_loc = glGetUniformLocation(prog, "proj");
> +
> + /* Set up vertex array object */
> + glGenVertexArrays(1, &vao);
> + glBindVertexArray(vao);
> +
> + /* Set up vertex input buffer */
> + glGenBuffers(1, &vertex_buf);
> + glBindBuffer(GL_ARRAY_BUFFER, vertex_buf);
> + glBufferData(GL_ARRAY_BUFFER, sizeof(pos_point), pos_point,
> + GL_STATIC_DRAW);
> + glEnableVertexAttribArray(0);
> + glVertexAttribPointer(0, ARRAY_SIZE(pos_point), GL_FLOAT,
> + GL_FALSE, 0, (void *) 0);
> +}
> +
> +void
> +StencilSpiral::draw(float (*proj)[4])
> +{
> + glEnable(GL_STENCIL_TEST);
> + glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
> +
> + glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
> +
> + glUseProgram(prog);
> + glUniformMatrix4fv(proj_loc, 1, GL_TRUE, &proj[0][0]);
> + glUniform1f(depth_loc, 0.0);
> + glBindVertexArray(vao);
> +
> + /* Total number of points drawn */
> + int total_points = num_circles * num_points;
> +
> + for (int i = 0; i < total_points; ++i) {
> + /* Set the stencil value of point between 0 - 7 */
> + glStencilFunc(GL_ALWAYS, i % 8, 0xff);
> + glPointSize(1 + 2 * ((total_points - i) / num_circles ));
> +
> + glUniform1f(length_loc, (1.0 - i * 1.0 / total_points));
> + glUniform1f(rotation_loc, M_PI * 2.0 * i / (num_points));
> +
> + glDrawArrays(GL_POINTS, 0, 1);
> + }
> +
> + glDisable(GL_STENCIL_TEST);
> +}
> +
> +void
> +DepthSpiral::draw(float (*proj)[4])
> +{
> + glEnable(GL_DEPTH_TEST);
> + glDepthFunc(GL_LESS);
> +
> + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
> +
> + glUseProgram(prog);
> + glUniformMatrix4fv(proj_loc, 1, GL_TRUE, &proj[0][0]);
> + glBindVertexArray(vao);
> +
> + /* Total number of points drawn */
> + int total_points = num_circles * num_points;
> +
> + for (int i = 0; i < total_points; ++i) {
> + glPointSize(1 + 2 * ((total_points - i) / num_circles ));
> +
> + /* Draw points in a haphazard order so we can verify that
> + * depth comparisons sort them out properly.
> + */
> + int point_to_draw = (i * 10) % total_points;
> +
> + glUniform1f(length_loc, (1.0 - i * 1.0 / total_points));
> +
> + /* Draw points in a depth range of -1 to +1 */
> + float depth = float(total_points - point_to_draw * 2 - 1)
> + / (total_points + 1);
> + glUniform1f(depth_loc, depth);
> + glUniform1f(rotation_loc, M_PI * 2.0 * i / num_points);
> +
> + glDrawArrays(GL_POINTS, 0, 1);
> + }
> +
> + glDisable(GL_DEPTH_TEST);
> +}
> +
> +void Star::compile()
> +{
> + /* Triangle coords within (-1,-1) to (1,1) rect */
> + static const float pos_line[][2] = {
> + { -0.3, -0.8 },
> + { 0.3, 0.8 }
> + };
> +
> + /* Total number of lines drawn */
> + num_lines = 7;
> +
> + static const char *vert =
> + "#version 130\n"
> + "in vec2 pos_line;\n"
> + "uniform float rotation;\n"
> + "uniform float depth;\n"
> + "uniform mat4 proj;\n"
> + "\n"
> + "void main()\n"
> + "{\n"
> + " vec2 pos = pos_line;\n"
> + " pos = mat2(cos(rotation), sin(rotation),\n"
> + " -sin(rotation), cos(rotation)) * pos;\n"
> + " gl_Position = proj * vec4(pos, depth, 1.0);\n"
> + "}\n";
> +
> + static const char *frag =
> + "#version 130\n"
> + "void main()\n"
> + "{\n"
> + " gl_FragColor = vec4(0.0);\n"
> + "}\n";
> +
> + /* Compile program */
> + prog = glCreateProgram();
> + GLint vs = piglit_compile_shader_text(GL_VERTEX_SHADER, vert);
> + glAttachShader(prog, vs);
> + GLint fs = piglit_compile_shader_text(GL_FRAGMENT_SHADER, frag);
> + glAttachShader(prog, fs);
> + glBindAttribLocation(prog, 0, "pos_line");
> + glLinkProgram(prog);
> + if (!piglit_link_check_status(prog)) {
> + piglit_report_result(PIGLIT_FAIL);
> + }
> +
> + /* Set up uniforms */
> + glUseProgram(prog);
> + rotation_loc = glGetUniformLocation(prog, "rotation");
> + depth_loc = glGetUniformLocation(prog, "depth");
> + glUniform1f(depth_loc, 0.0);
> + proj_loc = glGetUniformLocation(prog, "proj");
> +
> + /* Set up vertex array object */
> + glGenVertexArrays(1, &vao);
> + glBindVertexArray(vao);
> +
> + /* Set up vertex input buffer */
> + glGenBuffers(1, &vertex_buf);
> + glBindBuffer(GL_ARRAY_BUFFER, vertex_buf);
> + glBufferData(GL_ARRAY_BUFFER, sizeof(pos_line), pos_line,
> + GL_STATIC_DRAW);
> + glEnableVertexAttribArray(0);
> + glVertexAttribPointer(0, ARRAY_SIZE(pos_line[0]), GL_FLOAT,
> + GL_FALSE, sizeof(pos_line[0]), (void *) 0);
> +}
> +
> +void
> +StencilStar::draw(float (*proj)[4])
> +{
> + glEnable(GL_STENCIL_TEST);
> + glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
> +
> + glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
> +
> + glUseProgram(prog);
> + glUniformMatrix4fv(proj_loc, 1, GL_TRUE, &proj[0][0]);
> + glBindVertexArray(vao);
> + for (int i = 0; i < num_lines; ++i) {
> + glStencilFunc(GL_ALWAYS, i+1, 0xff);
> + glUniform1f(rotation_loc, M_PI * 2.0 * i / num_lines);
> + glDrawArrays(GL_LINES, 0, 2);
> + }
> +
> + glDisable(GL_STENCIL_TEST);
> +}
> +
> +void
> +DepthStar::draw(float (*proj)[4])
> +{
> + glEnable(GL_DEPTH_TEST);
> + glDepthFunc(GL_LESS);
> +
> + glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
> +
> + glUseProgram(prog);
> + glUniformMatrix4fv(proj_loc, 1, GL_TRUE, &proj[0][0]);
> + glBindVertexArray(vao);
> + for (int i = 0; i < num_lines; ++i) {
> + /* Draw lines in a haphazard order so we can verify
> + * that depth comparisons sort them out properly.
> + */
> + int line_to_draw = (i * 3) % num_lines;
> +
> + /* Note: with num_lines == 7, this causes us to draw
> + * lines at depths of 3/4, 1/2, -1/4, 0, 1/4, 1/2,
> + * and 3/4.
> + */
> + glUniform1f(depth_loc,
> + float(num_lines - line_to_draw * 2 - 1)
> + / (num_lines + 1));
> +
> + glUniform1f(rotation_loc,
> + M_PI * 2.0 * line_to_draw / num_lines);
> + glDrawArrays(GL_LINES, 0, 2);
> + }
> +
> + glDisable(GL_DEPTH_TEST);
> +}
> +
> void Sunburst::compile()
> {
> /* Triangle coords within (-1,-1) to (1,1) rect */
> diff --git a/tests/spec/ext_framebuffer_multisample/common.h
> b/tests/spec/ext_framebuffer_multisample/common.h
> index d86cb95..1bb39b4 100644
> --- a/tests/spec/ext_framebuffer_multisample/common.h
> +++ b/tests/spec/ext_framebuffer_multisample/common.h
> @@ -115,6 +115,7 @@ public:
>
> private:
> GLint prog;
> + GLint count;
> GLint color_loc;
> GLuint vertex_buf;
> GLuint vao;
> @@ -187,6 +188,157 @@ private:
> };
>
> /**
> + * Program we use to draw a test pattern into the color buffer.
> + *
> + * This program draws a sequence of points with varied sizes. This ensures
> + * antialiasing works well with all point sizes.
> + */
> +class Points : public TestPattern
> +{
> +public:
> + virtual void compile();
> + virtual void draw(float (*proj)[4]);
> +
> +private:
> + GLint prog;
> + GLuint vao;
> + GLint proj_loc;
> + GLint depth_loc;
> + GLint point_num_loc;
> + GLuint vertex_buf;
> + int num_points;
> +};
> +
> +/**
> + * Program we use to draw a test pattern into the depth and stencil
> + * buffers.
> + *
> + * This program draws a "spiral" pattern consisting of 45 points,
> + * each with a different size.
> + * This program is further specialized into depth and stencil variants.
> + */
> +class Spiral : public TestPattern
> +{
> +public:
> + virtual void compile();
> +
> +protected:
> + GLint prog;
> + GLint rotation_loc;
> + GLint depth_loc;
> + GLint length_loc;
> + GLint proj_loc;
> + GLuint vao;
> + int num_points;
> + int num_circles;
> +
> +private:
> + GLuint vertex_buf;
> +};
> +
> +/**
> + * Program we use to draw a test pattern into the stencil buffer.
> + *
> + * The points in this spiral are drawn back-to-front, using no
> + * depth testing. Each point is drawn using a stencil
> + * value between 0 to 7.
> + */
> +class StencilSpiral : public Spiral
> +{
> +public:
> + virtual void draw(float (*proj)[4]);
> +};
> +
> +/**
> + * Program we use to draw a test pattern into the depth buffer.
> + *
> + * The points in this spiral are drawn at a series of different
> + * depth values, with depth testing enabled. They are drawn in an
> + * arbitrary non-consecutive order, to verify that depth testing
> + * properly sorts the surfaces into front-to-back order.
> + */
> +class DepthSpiral : public Spiral
> +{
> +public:
> + virtual void draw(float (*proj)[4]);
> +};
> +
> +/**
> + * Program we use to draw a test pattern into the color buffer.
> + *
> + * This program draws a sequence of lines with varied width. This ensures
> + * antialiasing works well with all line widths.
> + */
> +class Lines : public TestPattern
> +{
> +public:
> + virtual void compile();
> + virtual void draw(float (*proj)[4]);
> +
> +private:
> + GLint prog;
> + GLuint vao;
> + GLint proj_loc;
> + GLint line_num_loc;
> + GLuint vertex_buf;
> + int num_lines;
> +};
> +
> +/**
> + * Program we use to draw a test pattern into the depth and stencil
> + * buffers.
> + *
> + * This program draws a "star" pattern consisting of 7 overlapping
> + * lines, each at a different angle. This ensures that we'll thoroughly
> + * exercise antialiasing.
> + *
> + * This program is further specialized into depth and stencil variants.
> + */
> +class Star : public TestPattern
> +{
> +public:
> + virtual void compile();
> +
> +protected:
> + GLint prog;
> + GLint rotation_loc;
> + GLint depth_loc;
> + GLint proj_loc;
> + GLuint vao;
> + int num_lines;
> +
> +private:
> + GLuint vertex_buf;
> +};
> +
> +/**
> + * Program we use to draw a test pattern into the stencil buffer.
> + *
> + * The lines in this star are drawn back-to-front, using no
> + * depth testing. Each line is drawn using a different stencil
> + * value.
> + */
> +class StencilStar : public Star
> +{
> +public:
> + virtual void draw(float (*proj)[4]);
> +};
> +
> +/**
> + * Program we use to draw a test pattern into the depth buffer.
> + *
> + * The lines in this star are drawn at a series of different
> + * depth values, with depth testing enabled. They are drawn in an
> + * arbitrary non-consecutive order, to verify that depth testing
> + * properly sorts the lines into front-to-back order.
> + */
> +class DepthStar : public Star
> +{
> +public:
> + virtual void draw(float (*proj)[4]);
> +};
> +
> +/**
> * Program we use to draw a test pattern into the depth and stencil
> * buffers.
> *
> --
> 1.7.7.6
>
> _______________________________________________
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> Piglit at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/piglit
>
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