wined3d: Add core context P8 blit support to the GLSL blitter.

We use GL_R8 for WINED3DFMT_P8_UINT in core contexts, since GL_ALPHA8 is not available. Signed-off-by: Henri Verbeet <hverbeet@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

wined3d: Add core context P8 blit support to the GLSL blitter.
71f24b8d · Henri Verbeet · Alexandre Julliard · b9163e22 · 71f24b8d
Commit 71f24b8d authored Apr 30, 2018 by Henri Verbeet Committed by Alexandre Julliard Apr 30, 2018
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glsl_shader.c dlls/wined3d/glsl_shader.c +3 -2

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--- a/dlls/wined3d/glsl_shader.c
+++ b/dlls/wined3d/glsl_shader.c
@@ -12318,8 +12318,9 @@ static void glsl_blitter_generate_p8_shader(struct wined3d_string_buffer *buffer
    shader_addline(buffer, "uniform sampler1D sampler_palette;\n");
    shader_addline(buffer, "\nvoid main()\n{\n");
    /* The alpha-component contains the palette index. */
-    shader_addline(buffer, "    float index = texture%s(sampler, out_texcoord.%s).w;\n",
+    shader_addline(buffer, "    float index = texture%s(sampler, out_texcoord.%s).%c;\n",
-            needs_legacy_glsl_syntax(gl_info) ? tex_type : "", swizzle);
+            needs_legacy_glsl_syntax(gl_info) ? tex_type : "", swizzle,
+            gl_info->supported[WINED3D_GL_LEGACY_CONTEXT] ? 'w' : 'x');
    /* Scale the index by 255/256 and add a bias of 0.5 in order to sample in
     * the middle. */
    shader_addline(buffer, "    index = (index * 255.0 + 0.5) / 256.0;\n");