cbd77008ff
* clutter/cogl/gles/cogl-gles2-wrapper.c: All of the settings and uniforms are now proxied into COGL variables instead of setting the GL uniforms directly. Just before glDrawArrays is executed a shader is generated using the given settings to avoid using 'if' statements. The shaders are cached. * clutter/cogl/gles/cogl-fixed-vertex-shader.glsl: * clutter/cogl/gles/cogl-fixed-fragment-shader.glsl: The shaders are now split into parts using comments instead of 'if' statements so that the simplest shader can be generated on the fly. * clutter/cogl/gles/stringify.sh: Now splits up the shader sources into separate C strings where deliminated by special comments. * clutter/cogl/gles/cogl-program.h: * clutter/cogl/gles/cogl-program.c: A custom shader can no longer be directly linked with the fixed-functionality replacement because the replacement changes depending on the settings. Instead the bound shader is linked with the appropriate replacement shader just before glDrawArrays is executed. The custom uniform variables must also be proxied through COGL variables because their location can change when relinked.
59 lines
1.8 KiB
GLSL
59 lines
1.8 KiB
GLSL
/*** cogl_fixed_vertex_shader_start ***/
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/* Per vertex attributes */
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attribute vec4 vertex_attrib;
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attribute vec4 tex_coord_attrib;
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attribute vec4 color_attrib;
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/* Transformation matrices */
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uniform mat4 modelview_matrix;
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uniform mat4 mvp_matrix; /* combined modelview and projection matrix */
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uniform mat4 texture_matrix;
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/* Outputs to the fragment shader */
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varying vec4 frag_color;
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varying vec2 tex_coord;
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varying float fog_amount;
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/* Fogging options */
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uniform float fog_density;
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uniform float fog_start;
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uniform float fog_end;
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void
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main (void)
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{
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/* Calculate the transformed position */
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gl_Position = mvp_matrix * vertex_attrib;
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/* Calculate the transformed texture coordinate */
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vec4 transformed_tex_coord = texture_matrix * tex_coord_attrib;
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tex_coord = transformed_tex_coord.st / transformed_tex_coord.q;
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/* Pass the interpolated vertex color on to the fragment shader */
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frag_color = color_attrib;
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/*** cogl_fixed_vertex_shader_fog_start ***/
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/* Estimate the distance from the eye using just the z-coordinate to
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use as the fog coord */
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vec4 eye_coord = modelview_matrix * vertex_attrib;
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float fog_coord = abs (eye_coord.z / eye_coord.w);
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/* Calculate the fog amount per-vertex and interpolate it for the
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fragment shader */
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/*** cogl_fixed_vertex_shader_fog_exp ***/
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fog_amount = exp (-fog_density * fog_coord);
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/*** cogl_fixed_vertex_shader_fog_exp2 ***/
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fog_amount = exp (-fog_density * fog_coord
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* fog_density * fog_coord);
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/*** cogl_fixed_vertex_shader_fog_linear ***/
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fog_amount = (fog_end - fog_coord) / (fog_end - fog_start);
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/*** cogl_fixed_vertex_shader_fog_end ***/
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fog_amount = clamp (fog_amount, 0.0, 1.0);
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/*** cogl_fixed_vertex_shader_end ***/
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}
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