97 lines
3.4 KiB
Diff
97 lines
3.4 KiB
Diff
From 78636289b073d67209a20145ef0dc003f2d77db6 Mon Sep 17 00:00:00 2001
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From: Sian Cao <yinshuiboy@gmail.com>
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Date: Tue, 12 Apr 2016 11:36:51 +0800
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Subject: Add GL_ARB_shader_texture_lod support
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The patch is used to do lod biased texturing. I can achieve
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faster blurring of images instead of using large blur radius.
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Signed-off-by:
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Sian Cao <yinshuiboy@gmail.com>: initial
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---
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cogl/cogl-context.h | 1 +
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cogl/cogl-glsl-shader.c | 13 +++++++++++--
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cogl/cogl-types.h | 3 ++-
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cogl/driver/gl/gl/cogl-driver-gl.c | 7 +++++++
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4 files changed, 21 insertions(+), 3 deletions(-)
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diff --git a/cogl/cogl-context.h b/cogl/cogl-context.h
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index 07badeb..261ce49 100644
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--- a/cogl/cogl-context.h
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+++ b/cogl/cogl-context.h
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@@ -290,6 +290,7 @@ typedef enum _CoglFeatureID
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COGL_FEATURE_ID_PER_VERTEX_POINT_SIZE,
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COGL_FEATURE_ID_TEXTURE_RG,
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COGL_FEATURE_ID_BUFFER_AGE,
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+ COGL_FEATURE_ID_SHADER_TEXTURE_LOD,
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/*< private >*/
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_COGL_N_FEATURE_IDS /*< skip >*/
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diff --git a/cogl/cogl-glsl-shader.c b/cogl/cogl-glsl-shader.c
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index 196e0c7..4fb0eb5 100644
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--- a/cogl/cogl-glsl-shader.c
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+++ b/cogl/cogl-glsl-shader.c
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@@ -87,8 +87,8 @@ _cogl_glsl_shader_set_source_with_boilerplate (CoglContext *ctx,
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const char *vertex_boilerplate;
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const char *fragment_boilerplate;
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- const char **strings = g_alloca (sizeof (char *) * (count_in + 4));
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- GLint *lengths = g_alloca (sizeof (GLint) * (count_in + 4));
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+ const char **strings = g_alloca (sizeof (char *) * (count_in + 5));
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+ GLint *lengths = g_alloca (sizeof (GLint) * (count_in + 5));
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char *version_string;
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int count = 0;
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@@ -111,6 +111,15 @@ _cogl_glsl_shader_set_source_with_boilerplate (CoglContext *ctx,
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lengths[count++] = sizeof (texture_3d_extension) - 1;
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}
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+ if (_cogl_has_private_feature (ctx, COGL_PRIVATE_FEATURE_GL_PROGRAMMABLE) &&
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+ cogl_has_feature (ctx, COGL_FEATURE_ID_SHADER_TEXTURE_LOD))
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+ {
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+ static const char shader_texture_lod_ext[] =
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+ "#extension GL_ARB_shader_texture_lod : enable\n";
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+ strings[count] = shader_texture_lod_ext;
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+ lengths[count++] = sizeof (shader_texture_lod_ext) - 1;
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+ }
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+
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if (shader_gl_type == GL_VERTEX_SHADER)
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{
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strings[count] = vertex_boilerplate;
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diff --git a/cogl/cogl-types.h b/cogl/cogl-types.h
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index 6accf8d..77964c6 100644
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--- a/cogl/cogl-types.h
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+++ b/cogl/cogl-types.h
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@@ -470,7 +470,8 @@ typedef enum
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COGL_FEATURE_MAP_BUFFER_FOR_READ = (1 << 21),
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COGL_FEATURE_MAP_BUFFER_FOR_WRITE = (1 << 22),
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COGL_FEATURE_ONSCREEN_MULTIPLE = (1 << 23),
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- COGL_FEATURE_DEPTH_TEXTURE = (1 << 24)
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+ COGL_FEATURE_DEPTH_TEXTURE = (1 << 24),
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+ COGL_FEATURE_SHADER_TEXTURE_LOD = (1 << 25)
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} CoglFeatureFlags;
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/**
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diff --git a/cogl/driver/gl/gl/cogl-driver-gl.c b/cogl/driver/gl/gl/cogl-driver-gl.c
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index 716d1dd..f305b6a 100644
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--- a/cogl/driver/gl/gl/cogl-driver-gl.c
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+++ b/cogl/driver/gl/gl/cogl-driver-gl.c
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@@ -568,6 +568,13 @@ _cogl_driver_update_features (CoglContext *ctx,
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COGL_FEATURE_ID_TEXTURE_RECTANGLE, TRUE);
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}
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+ if (_cogl_check_extension ("GL_ARB_shader_texture_lod", gl_extensions))
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+ {
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+ flags |= COGL_FEATURE_SHADER_TEXTURE_LOD;
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+ COGL_FLAGS_SET (ctx->features,
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+ COGL_FEATURE_ID_SHADER_TEXTURE_LOD, TRUE);
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+ }
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+
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if (ctx->glTexImage3D)
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{
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flags |= COGL_FEATURE_TEXTURE_3D;
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--
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2.9.5
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