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https://github.com/obsproject/obs-studio.git
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libobs: Add low resolution bilinear scale effect
This effect preserves detail of images that are scaled below half size by using sampling 9 pixels.
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84
libobs/data/bilinear_lowres_scale.effect
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84
libobs/data/bilinear_lowres_scale.effect
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@ -0,0 +1,84 @@
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/*
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* bilinear low res scaling, samples 9 pixels of a larger image to scale to a
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* low resolution image below half size
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*/
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uniform float4x4 ViewProj;
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uniform texture2d image;
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uniform float4x4 color_matrix;
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uniform float3 color_range_min = {0.0, 0.0, 0.0};
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uniform float3 color_range_max = {1.0, 1.0, 1.0};
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uniform float2 base_dimension_i;
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sampler_state textureSampler {
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Filter = Linear;
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AddressU = Clamp;
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AddressV = Clamp;
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};
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struct VertData {
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float4 pos : POSITION;
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float2 uv : TEXCOORD0;
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};
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VertData VSDefault(VertData v_in)
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{
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VertData vert_out;
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vert_out.pos = mul(float4(v_in.pos.xyz, 1.0), ViewProj);
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vert_out.uv = v_in.uv;
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return vert_out;
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}
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float4 pixel(float2 uv)
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{
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return image.Sample(textureSampler, uv);
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}
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float4 DrawLowresBilinear(VertData v_in)
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{
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float2 stepxy = base_dimension_i;
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float4 output;
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output = pixel(v_in.uv);
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output += pixel(v_in.uv + float2(-stepxy.x, -stepxy.y));
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output += pixel(v_in.uv + float2(-stepxy.x, 0.0));
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output += pixel(v_in.uv + float2(-stepxy.x, stepxy.y));
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output += pixel(v_in.uv + float2( 0.0, -stepxy.y));
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output += pixel(v_in.uv + float2( 0.0, stepxy.y));
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output += pixel(v_in.uv + float2( stepxy.x, -stepxy.y));
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output += pixel(v_in.uv + float2( stepxy.x, 0.0));
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output += pixel(v_in.uv + float2( stepxy.x, stepxy.y));
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return output / float4(9.0, 9.0, 9.0, 9.0);
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}
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float4 PSDrawLowresBilinearRGBA(VertData v_in) : TARGET
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{
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return DrawLowresBilinear(v_in);
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}
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float4 PSDrawLowresBilinearMatrix(VertData v_in) : TARGET
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{
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float4 yuv = DrawLowresBilinear(v_in);
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yuv.xyz = clamp(yuv.xyz, color_range_min, color_range_max);
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return saturate(mul(float4(yuv.xyz, 1.0), color_matrix));
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}
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technique Draw
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{
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pass
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{
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vertex_shader = VSDefault(v_in);
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pixel_shader = PSDrawLowresBilinearRGBA(v_in);
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}
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}
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technique DrawMatrix
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{
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pass
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{
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vertex_shader = VSDefault(v_in);
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pixel_shader = PSDrawLowresBilinearMatrix(v_in);
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}
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}
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@ -154,6 +154,7 @@ struct obs_core_video {
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gs_effect_t *conversion_effect;
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gs_effect_t *conversion_effect;
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gs_effect_t *bicubic_effect;
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gs_effect_t *bicubic_effect;
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gs_effect_t *lanczos_effect;
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gs_effect_t *lanczos_effect;
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gs_effect_t *bilinear_lowres_effect;
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gs_stagesurf_t *mapped_surface;
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gs_stagesurf_t *mapped_surface;
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int cur_texture;
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int cur_texture;
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12
libobs/obs.c
12
libobs/obs.c
@ -254,6 +254,11 @@ static int obs_init_graphics(struct obs_video_info *ovi)
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NULL);
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NULL);
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bfree(filename);
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bfree(filename);
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filename = find_libobs_data_file("bilinear_lowres_scale.effect");
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video->bilinear_lowres_effect = gs_effect_create_from_file(filename,
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NULL);
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bfree(filename);
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if (!video->default_effect)
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if (!video->default_effect)
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success = false;
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success = false;
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if (gs_get_device_type() == GS_DEVICE_OPENGL) {
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if (gs_get_device_type() == GS_DEVICE_OPENGL) {
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@ -423,6 +428,7 @@ static void obs_free_graphics(void)
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gs_effect_destroy(video->conversion_effect);
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gs_effect_destroy(video->conversion_effect);
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gs_effect_destroy(video->bicubic_effect);
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gs_effect_destroy(video->bicubic_effect);
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gs_effect_destroy(video->lanczos_effect);
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gs_effect_destroy(video->lanczos_effect);
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gs_effect_destroy(video->bilinear_lowres_effect);
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video->default_effect = NULL;
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video->default_effect = NULL;
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gs_leave_context();
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gs_leave_context();
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@ -1197,6 +1203,12 @@ gs_effect_t *obs_get_lanczos_effect(void)
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return obs->video.lanczos_effect;
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return obs->video.lanczos_effect;
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}
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}
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gs_effect_t *obs_get_bilinear_lowres_effect(void)
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{
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if (!obs) return NULL;
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return obs->video.bilinear_lowres_effect;
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}
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signal_handler_t *obs_get_signal_handler(void)
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signal_handler_t *obs_get_signal_handler(void)
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{
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{
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if (!obs) return NULL;
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if (!obs) return NULL;
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@ -509,6 +509,9 @@ EXPORT gs_effect_t *obs_get_bicubic_effect(void);
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/** Returns the lanczos scaling effect */
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/** Returns the lanczos scaling effect */
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EXPORT gs_effect_t *obs_get_lanczos_effect(void);
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EXPORT gs_effect_t *obs_get_lanczos_effect(void);
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/** Returns the bilinear lowres scaling effect */
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EXPORT gs_effect_t *obs_get_bilinear_lowres_effect(void);
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/** Returns the primary obs signal handler */
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/** Returns the primary obs signal handler */
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EXPORT signal_handler_t *obs_get_signal_handler(void);
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EXPORT signal_handler_t *obs_get_signal_handler(void);
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