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wined3d: Use clamp() instead of max() for calculating the clamped cosine in the ffp lighting calculations. 

On typical hardware, the clamp() would be an instruction modifier, while the
max() would need an extra instruction.
This commit is contained in:
Henri Verbeet 2013-09-04 08:56:43 +02:00 committed by Alexandre Julliard
parent 725b069e68
commit ff6ce4c669
1 changed files with 4 additions and 3 deletions
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7
dlls/wined3d/glsl_shader.c
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@ -4940,7 +4940,7 @@ static void shader_glsl_ffp_vertex_lighting(struct wined3d_shader_buffer *buffer
if (!settings->normal)
break;
shader_addline(buffer, "dir = normalize(dir);\n");
shader_addline(buffer, "diffuse += (max(0.0, dot(dir, normal))"
shader_addline(buffer, "diffuse += (clamp(dot(dir, normal), 0.0, 1.0)"
" * gl_LightSource[%u].diffuse.xyz) / att;\n", i);
if (settings->localviewer)
shader_addline(buffer, "t = dot(normal, normalize(dir - normalize(ec_pos.xyz)));\n");
@ -4965,7 +4965,7 @@ static void shader_glsl_ffp_vertex_lighting(struct wined3d_shader_buffer *buffer
shader_addline(buffer, "ambient += gl_LightSource[%u].ambient.xyz * att;\n", i);
if (!settings->normal)
break;
shader_addline(buffer, "diffuse += (max(0.0, dot(dir, normal))"
shader_addline(buffer, "diffuse += (clamp(dot(dir, normal), 0.0, 1.0)"
" * gl_LightSource[%u].diffuse.xyz) * att;\n", i);
if (settings->localviewer)
shader_addline(buffer, "t = dot(normal, normalize(dir - normalize(ec_pos.xyz)));\n");
@ -4980,7 +4980,8 @@ static void shader_glsl_ffp_vertex_lighting(struct wined3d_shader_buffer *buffer
if (!settings->normal)
break;
shader_addline(buffer, "dir = normalize(gl_LightSource[%u].position.xyz);\n", i);
shader_addline(buffer, "diffuse += max(0.0, dot(dir, normal)) * gl_LightSource[%u].diffuse.xyz;\n", i);
shader_addline(buffer, "diffuse += clamp(dot(dir, normal), 0.0, 1.0)"
" * gl_LightSource[%u].diffuse.xyz;\n", i);
shader_addline(buffer, "t = dot(normal, gl_LightSource[%u].halfVector.xyz);\n", i);
shader_addline(buffer, "if (t > 0.0) specular += pow(t, gl_FrontMaterial.shininess)"
" * gl_LightSource[%u].specular;\n", i);