use subtractive blend equation to support negative v_brightness; support smaller...

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@11191 d7cf8633-e32d-0410-b094-e92efae38249

diff --git a/gl_backend.c b/gl_backend.c
index 0a08f1616722cd37d38f9ce2c8f42cf316984d22..0c3e73915e2192045b8645231d7ff6746680b274 100644 (file)
--- a/gl_backend.c
+++ b/gl_backend.c
@@ -4396,3 +4396,61 @@ void R_Mesh_PrepareVertices_Mesh(int numvertices, const r_vertexmesh_t *vertex,
                break;
        }
 }
+
+void GL_BlendEquationSubtract(qboolean negated)
+{
+       if(negated)
+       {
+               switch(vid.renderpath)
+               {
+               case RENDERPATH_GL11:
+               case RENDERPATH_GL13:
+               case RENDERPATH_GL20:
+               case RENDERPATH_GLES1:
+               case RENDERPATH_GLES2:
+                       qglBlendEquationEXT(GL_FUNC_REVERSE_SUBTRACT_EXT);
+                       break;
+               case RENDERPATH_D3D9:
+#ifdef SUPPORTD3D
+                       IDirect3DDevice9_SetRenderState(vid_d3d9dev, D3DRS_BLENDOP, D3DBLENDOP_SUBTRACT);
+#endif
+                       break;
+               case RENDERPATH_D3D10:
+                       Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+                       break;
+               case RENDERPATH_D3D11:
+                       Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+                       break;
+               case RENDERPATH_SOFT:
+                       DPSOFTRAST_BlendSubtract(true);
+                       break;
+               }
+       }
+       else
+       {
+               switch(vid.renderpath)
+               {
+               case RENDERPATH_GL11:
+               case RENDERPATH_GL13:
+               case RENDERPATH_GL20:
+               case RENDERPATH_GLES1:
+               case RENDERPATH_GLES2:
+                       qglBlendEquationEXT(GL_FUNC_ADD_EXT);
+                       break;
+               case RENDERPATH_D3D9:
+#ifdef SUPPORTD3D
+                       IDirect3DDevice9_SetRenderState(vid_d3d9dev, D3DRS_BLENDOP, D3DBLENDOP_ADD);
+#endif
+                       break;
+               case RENDERPATH_D3D10:
+                       Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+                       break;
+               case RENDERPATH_D3D11:
+                       Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
+                       break;
+               case RENDERPATH_SOFT:
+                       DPSOFTRAST_BlendSubtract(false);
+                       break;
+               }
+       }
+}

diff --git a/gl_backend.h b/gl_backend.h
index 44418d971d5ce31de0c1af1689c872a845ebff1e..0a35233621018c4c26ccc3381f40e34d4a8d0c41 100644 (file)
--- a/gl_backend.h
+++ b/gl_backend.h
@@ -31,6 +31,7 @@ void R_GetViewport(r_viewport_t *v);
 void GL_Finish(void);
 
 void GL_BlendFunc(int blendfunc1, int blendfunc2);
+void GL_BlendEquationSubtract(qboolean negated);
 void GL_DepthMask(int state);
 void GL_DepthTest(int state);
 void GL_DepthFunc(int state);

diff --git a/gl_draw.c b/gl_draw.c
index 705253b00a30810808935160790f2fd6ff89082d..01329fcb8e7eb5263ee96af18b9731f5fd6c585f 100644 (file)
--- a/gl_draw.c
+++ b/gl_draw.c
@@ -2159,6 +2159,36 @@ void R_DrawGamma(void)
        GL_DepthRange(0, 1);
        GL_PolygonOffset(0, 0);
        GL_DepthTest(false);
+
+       // interpretation of brightness and contrast:
+       //   color range := brightness .. (brightness + contrast)
+       // i.e. "c *= contrast; c += brightness"
+       // plausible values for brightness thus range from -contrast to 1
+
+       // apply pre-brightness (subtractive brightness, for where contrast was >= 1)
+       if (vid.support.ext_blend_subtract)
+       {
+               if (v_color_enable.integer)
+               {
+                       c[0] = -v_color_black_r.value / v_color_white_r.value;
+                       c[1] = -v_color_black_g.value / v_color_white_g.value;
+                       c[2] = -v_color_black_b.value / v_color_white_b.value;
+               }
+               else
+                       c[0] = c[1] = c[2] = -v_brightness.value / v_contrast.value;
+               if (c[0] >= 0.01f || c[1] >= 0.01f || c[2] >= 0.01f)
+               {
+                       // need SUBTRACTIVE blending to do this!
+                       GL_BlendEquationSubtract(true);
+                       GL_BlendFunc(GL_ONE, GL_ONE);
+                       GL_Color(c[0], c[1], c[2], 1);
+                       R_Mesh_PrepareVertices_Generic_Arrays(3, blendvertex3f, NULL, NULL);
+                       R_Mesh_Draw(0, 3, 0, 1, polygonelement3i, NULL, 0, polygonelement3s, NULL, 0);
+                       GL_BlendEquationSubtract(false);
+               }
+       }
+
+       // apply contrast
        if (v_color_enable.integer)
        {
                c[0] = v_color_white_r.value;
@@ -2167,17 +2197,32 @@ void R_DrawGamma(void)
        }
        else
                c[0] = c[1] = c[2] = v_contrast.value;
-       if (c[0] >= 1.01f || c[1] >= 1.01f || c[2] >= 1.01f)
+       if (c[0] >= 1.003f || c[1] >= 1.003f || c[2] >= 1.003f)
        {
                GL_BlendFunc(GL_DST_COLOR, GL_ONE);
-               while (c[0] >= 1.01f || c[1] >= 1.01f || c[2] >= 1.01f)
+               while (c[0] >= 1.003f || c[1] >= 1.003f || c[2] >= 1.003f)
                {
-                       GL_Color(c[0] - 1, c[1] - 1, c[2] - 1, 1);
+                       float cc[4];
+                       cc[0] = bound(0, c[0] - 1, 1);
+                       cc[1] = bound(0, c[1] - 1, 1);
+                       cc[2] = bound(0, c[2] - 1, 1);
+                       GL_Color(cc[0], cc[1], cc[2], 1);
                        R_Mesh_PrepareVertices_Generic_Arrays(3, blendvertex3f, NULL, NULL);
                        R_Mesh_Draw(0, 3, 0, 1, polygonelement3i, NULL, 0, polygonelement3s, NULL, 0);
-                       VectorScale(c, 0.5, c);
+                       c[0] /= 1 + cc[0];
+                       c[1] /= 1 + cc[1];
+                       c[2] /= 1 + cc[2];
                }
        }
+       if (c[0] <= 0.997f || c[1] <= 0.997f || c[2] <= 0.997f)
+       {
+               GL_BlendFunc(GL_DST_COLOR, GL_ZERO);
+               GL_Color(c[0], c[1], c[2], 1);
+               R_Mesh_PrepareVertices_Generic_Arrays(3, blendvertex3f, NULL, NULL);
+               R_Mesh_Draw(0, 3, 0, 1, polygonelement3i, NULL, 0, polygonelement3s, NULL, 0);
+       }
+
+       // apply post-brightness (additive brightness, for where contrast was <= 1)
        if (v_color_enable.integer)
        {
                c[0] = v_color_black_r.value;
@@ -2189,7 +2234,7 @@ void R_DrawGamma(void)
        if (c[0] >= 0.01f || c[1] >= 0.01f || c[2] >= 0.01f)
        {
                GL_BlendFunc(GL_ONE, GL_ONE);
-               GL_Color(c[0] - 1, c[1] - 1, c[2] - 1, 1);
+               GL_Color(c[0], c[1], c[2], 1);
                R_Mesh_PrepareVertices_Generic_Arrays(3, blendvertex3f, NULL, NULL);
                R_Mesh_Draw(0, 3, 0, 1, polygonelement3i, NULL, 0, polygonelement3s, NULL, 0);
        }

diff --git a/r_shadow.c b/r_shadow.c
index 7de402e85ac437465c7efc589d36085b18e91c6e..9915a113a057b7a3075c11f53d4d1ba0a2a45f96 100644 (file)
--- a/r_shadow.c
+++ b/r_shadow.c
@@ -3351,30 +3351,7 @@ void R_Shadow_RenderLighting(int texturenumsurfaces, const msurface_t **textures
        if(negated)
        {
                VectorNegate(lightcolor, lightcolor);
-               switch(vid.renderpath)
-               {
-               case RENDERPATH_GL11:
-               case RENDERPATH_GL13:
-               case RENDERPATH_GL20:
-               case RENDERPATH_GLES1:
-               case RENDERPATH_GLES2:
-                       qglBlendEquationEXT(GL_FUNC_REVERSE_SUBTRACT_EXT);
-                       break;
-               case RENDERPATH_D3D9:
-#ifdef SUPPORTD3D
-                       IDirect3DDevice9_SetRenderState(vid_d3d9dev, D3DRS_BLENDOP, D3DBLENDOP_SUBTRACT);
-#endif
-                       break;
-               case RENDERPATH_D3D10:
-                       Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                       break;
-               case RENDERPATH_D3D11:
-                       Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                       break;
-               case RENDERPATH_SOFT:
-                       DPSOFTRAST_BlendSubtract(true);
-                       break;
-               }
+               GL_BlendEquationSubtract(true);
        }
        RSurf_SetupDepthAndCulling();
        switch (r_shadow_rendermode)
@@ -3397,32 +3374,7 @@ void R_Shadow_RenderLighting(int texturenumsurfaces, const msurface_t **textures
                break;
        }
        if(negated)
-       {
-               switch(vid.renderpath)
-               {
-               case RENDERPATH_GL11:
-               case RENDERPATH_GL13:
-               case RENDERPATH_GL20:
-               case RENDERPATH_GLES1:
-               case RENDERPATH_GLES2:
-                       qglBlendEquationEXT(GL_FUNC_ADD_EXT);
-                       break;
-               case RENDERPATH_D3D9:
-#ifdef SUPPORTD3D
-                       IDirect3DDevice9_SetRenderState(vid_d3d9dev, D3DRS_BLENDOP, D3DBLENDOP_ADD);
-#endif
-                       break;
-               case RENDERPATH_D3D10:
-                       Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                       break;
-               case RENDERPATH_D3D11:
-                       Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                       break;
-               case RENDERPATH_SOFT:
-                       DPSOFTRAST_BlendSubtract(false);
-                       break;
-               }
-       }
+               GL_BlendEquationSubtract(false);
 }
 
 void R_RTLight_Update(rtlight_t *rtlight, int isstatic, matrix4x4_t *matrix, vec3_t color, int style, const char *cubemapname, int shadow, vec_t corona, vec_t coronasizescale, vec_t ambientscale, vec_t diffusescale, vec_t specularscale, int flags)
@@ -5255,61 +5207,13 @@ void R_DrawCorona(rtlight_t *rtlight, float cscale, float scale)
                if(negated)
                {
                        VectorNegate(color, color);
-                       switch(vid.renderpath)
-                       {
-                       case RENDERPATH_GL11:
-                       case RENDERPATH_GL13:
-                       case RENDERPATH_GL20:
-                       case RENDERPATH_GLES1:
-                       case RENDERPATH_GLES2:
-                               qglBlendEquationEXT(GL_FUNC_REVERSE_SUBTRACT_EXT);
-                               break;
-                       case RENDERPATH_D3D9:
-#ifdef SUPPORTD3D
-                               IDirect3DDevice9_SetRenderState(vid_d3d9dev, D3DRS_BLENDOP, D3DBLENDOP_SUBTRACT);
-#endif
-                               break;
-                       case RENDERPATH_D3D10:
-                               Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                               break;
-                       case RENDERPATH_D3D11:
-                               Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                               break;
-                       case RENDERPATH_SOFT:
-                               DPSOFTRAST_BlendSubtract(true);
-                               break;
-                       }
+                       GL_BlendEquationSubtract(true);
                }
                R_CalcSprite_Vertex3f(vertex3f, rtlight->shadoworigin, r_refdef.view.right, r_refdef.view.up, scale, -scale, -scale, scale);
                RSurf_ActiveCustomEntity(&identitymatrix, &identitymatrix, RENDER_NODEPTHTEST, 0, color[0], color[1], color[2], 1, 4, vertex3f, spritetexcoord2f, NULL, NULL, NULL, NULL, 2, polygonelement3i, polygonelement3s, false, false);
                R_DrawCustomSurface(r_shadow_lightcorona, &identitymatrix, MATERIALFLAG_ADD | MATERIALFLAG_BLENDED | MATERIALFLAG_FULLBRIGHT | MATERIALFLAG_NOCULLFACE, 0, 4, 0, 2, false, false);
                if(negated)
-               {
-                       switch(vid.renderpath)
-                       {
-                       case RENDERPATH_GL11:
-                       case RENDERPATH_GL13:
-                       case RENDERPATH_GL20:
-                       case RENDERPATH_GLES1:
-                       case RENDERPATH_GLES2:
-                               qglBlendEquationEXT(GL_FUNC_ADD_EXT);
-                               break;
-                       case RENDERPATH_D3D9:
-#ifdef SUPPORTD3D
-                               IDirect3DDevice9_SetRenderState(vid_d3d9dev, D3DRS_BLENDOP, D3DBLENDOP_ADD);
-#endif
-                               break;
-                       case RENDERPATH_D3D10:
-                               Con_DPrintf("FIXME D3D10 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                               break;
-                       case RENDERPATH_D3D11:
-                               Con_DPrintf("FIXME D3D11 %s:%i %s\n", __FILE__, __LINE__, __FUNCTION__);
-                               break;
-                       case RENDERPATH_SOFT:
-                               DPSOFTRAST_BlendSubtract(false);
-                               break;
-                       }
-               }
+                       GL_BlendEquationSubtract(false);
        }
 }
 

diff --git a/vid_shared.c b/vid_shared.c
index 873d43285c39bf3cca2bb5c64e7f0a2f3dd5274a..4539f9d86c2fdcc43285afd30c5a51d955543518 100644 (file)
--- a/vid_shared.c
+++ b/vid_shared.c
@@ -1458,8 +1458,8 @@ void VID_UpdateGamma(qboolean force, int rampsize)
                wantgamma = 0;
 #define BOUNDCVAR(cvar, m1, m2) c = &(cvar);f = bound(m1, c->value, m2);if (c->value != f) Cvar_SetValueQuick(c, f);
        BOUNDCVAR(v_gamma, 0.1, 5);
-       BOUNDCVAR(v_contrast, 1, 5);
-       BOUNDCVAR(v_brightness, 0, 0.8);
+       BOUNDCVAR(v_contrast, 0.2, 5);
+       BOUNDCVAR(v_brightness, -v_contrast.value * 0.8, 0.8);
        //BOUNDCVAR(v_contrastboost, 0.0625, 16);
        BOUNDCVAR(v_color_black_r, 0, 0.8);
        BOUNDCVAR(v_color_black_g, 0, 0.8);