Commit 9601479f authored by Emmanuele Bassi's avatar Emmanuele Bassi

Allow testglarea to work with legacy GL contexts

Use the 1.30 GLSL shading language for the fragment and vertex shaders.

https://bugzilla.gnome.org/show_bug.cgi?id=756142
parent 105f1c9f
......@@ -80,7 +80,7 @@ create_shader (int type, const char *src)
return shader;
}
static const char *vertex_shader_code =
static const char *vertex_shader_code_330 =
"#version 330\n" \
"\n" \
"layout(location = 0) in vec4 position;\n" \
......@@ -89,7 +89,16 @@ static const char *vertex_shader_code =
" gl_Position = mvp * position;\n" \
"}";
static const char *fragment_shader_code =
static const char *vertex_shader_code_legacy =
"#version 130\n" \
"\n" \
"attribute vec4 position;\n" \
"uniform mat4 mvp;\n" \
"void main() {\n" \
" gl_Position = mvp * position;\n" \
"}";
static const char *fragment_shader_code_330 =
"#version 330\n" \
"\n" \
"out vec4 outputColor;\n" \
......@@ -98,8 +107,18 @@ static const char *fragment_shader_code =
" outputColor = mix(vec4(1.0f, 0.85f, 0.35f, 1.0f), vec4(0.2f, 0.2f, 0.2f, 1.0f), lerpVal);\n" \
"}";
static const char *fragment_shader_code_legacy =
"#version 130\n" \
"\n" \
"void main() {\n" \
" float lerpVal = gl_FragCoord.y / 400.0f;\n" \
" gl_FragColor = mix(vec4(1.0f, 0.85f, 0.35f, 1.0f), vec4(0.2f, 0.2, 0.2f, 1.0f), lerpVal);\n" \
"}";
static void
init_shaders (GLuint *program_out,
init_shaders (const char *vertex_shader_code,
const char *fragment_shader_code,
GLuint *program_out,
GLuint *mvp_out)
{
GLuint vertex, fragment;
......@@ -215,10 +234,28 @@ static GLuint mvp_location;
static void
realize (GtkWidget *widget)
{
const char *fragment, *vertex;
GdkGLContext *context;
gtk_gl_area_make_current (GTK_GL_AREA (widget));
if (gtk_gl_area_get_error (GTK_GL_AREA (widget)) != NULL)
return;
context = gtk_gl_area_get_context (GTK_GL_AREA (widget));
if (!gdk_gl_context_is_legacy (context))
{
vertex = vertex_shader_code_330;
fragment = fragment_shader_code_330;
}
else
{
vertex = vertex_shader_code_legacy;
fragment = fragment_shader_code_legacy;
}
init_buffers (&position_buffer, NULL);
init_shaders (&program, &mvp_location);
init_shaders (vertex, fragment, &program, &mvp_location);
}
static void
......@@ -226,6 +263,9 @@ unrealize (GtkWidget *widget)
{
gtk_gl_area_make_current (GTK_GL_AREA (widget));
if (gtk_gl_area_get_error (GTK_GL_AREA (widget)) != NULL)
return;
glDeleteBuffers (1, &position_buffer);
glDeleteProgram (program);
}
......
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